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| 22 | <a href="./Home">MLton 20180207</a>\r |
| 23 | </div>\r |
| 24 | </div>\r |
| 25 | <div id="header">\r |
| 26 | <h1>MLtonThread</h1>\r |
| 27 | </div>\r |
| 28 | <div id="content">\r |
| 29 | <div id="preamble">\r |
| 30 | <div class="sectionbody">\r |
| 31 | <div class="listingblock">\r |
| 32 | <div class="content"><div class="highlight"><pre><span class="k">signature</span><span class="w"> </span><span class="n">MLTON_THREAD</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 33 | <span class="w"> </span><span class="k">sig</span><span class="w"></span>\r |
| 34 | <span class="w"> </span><span class="k">structure</span><span class="w"> </span><span class="n">AtomicState</span><span class="p">:</span><span class="w"></span>\r |
| 35 | <span class="w"> </span><span class="k">sig</span><span class="w"></span>\r |
| 36 | <span class="w"> </span><span class="k">datatype</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">NonAtomic</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">Atomic</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="n">int</span><span class="w"></span>\r |
| 37 | <span class="w"> </span><span class="k">end</span><span class="w"></span>\r |
| 38 | \r |
| 39 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">atomically</span><span class="p">:</span><span class="w"> </span><span class="p">(</span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="p">)</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"></span>\r |
| 40 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">atomicBegin</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="w"></span>\r |
| 41 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">atomicEnd</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="w"></span>\r |
| 42 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">atomicState</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">AtomicState</span><span class="p">.</span><span class="n">t</span><span class="w"></span>\r |
| 43 | \r |
| 44 | <span class="w"> </span><span class="k">structure</span><span class="w"> </span><span class="n">Runnable</span><span class="p">:</span><span class="w"></span>\r |
| 45 | <span class="w"> </span><span class="k">sig</span><span class="w"></span>\r |
| 46 | <span class="w"> </span><span class="k">type</span><span class="w"> </span><span class="n">t</span><span class="w"></span>\r |
| 47 | <span class="w"> </span><span class="k">end</span><span class="w"></span>\r |
| 48 | \r |
| 49 | <span class="w"> </span><span class="k">type</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"></span>\r |
| 50 | \r |
| 51 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">atomicSwitch</span><span class="p">:</span><span class="w"> </span><span class="p">(</span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="p">)</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"></span>\r |
| 52 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">new</span><span class="p">:</span><span class="w"> </span><span class="p">(</span><span class="n">'a</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="p">)</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"></span>\r |
| 53 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">prepend</span><span class="p">:</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="n">*</span><span class="w"> </span><span class="p">(</span><span class="n">'b</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="p">)</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'b</span><span class="w"> </span><span class="n">t</span><span class="w"></span>\r |
| 54 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">prepare</span><span class="p">:</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="n">*</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="w"></span>\r |
| 55 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">switch</span><span class="p">:</span><span class="w"> </span><span class="p">(</span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="p">)</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"></span>\r |
| 56 | <span class="w"> </span><span class="k">end</span><span class="w"></span>\r |
| 57 | </pre></div></div></div>\r |
| 58 | <div class="paragraph"><p><span class="monospaced">MLton.Thread</span> provides access to MLton’s user-level thread\r |
| 59 | implementation (i.e. not OS-level threads). Threads are lightweight\r |
| 60 | data structures that represent a paused computation. Runnable threads\r |
| 61 | are threads that will begin or continue computing when <span class="monospaced">switch</span>-ed to.\r |
| 62 | <span class="monospaced">MLton.Thread</span> does not include a default scheduling mechanism, but it\r |
| 63 | can be used to implement both preemptive and non-preemptive threads.</p></div>\r |
| 64 | <div class="ulist"><ul>\r |
| 65 | <li>\r |
| 66 | <p>\r |
| 67 | <span class="monospaced">type AtomicState.t</span>\r |
| 68 | </p>\r |
| 69 | <div class="paragraph"><p>the type of atomic states.</p></div>\r |
| 70 | </li>\r |
| 71 | <li>\r |
| 72 | <p>\r |
| 73 | <span class="monospaced">atomically f</span>\r |
| 74 | </p>\r |
| 75 | <div class="paragraph"><p>runs <span class="monospaced">f</span> in a critical section.</p></div>\r |
| 76 | </li>\r |
| 77 | <li>\r |
| 78 | <p>\r |
| 79 | <span class="monospaced">atomicBegin ()</span>\r |
| 80 | </p>\r |
| 81 | <div class="paragraph"><p>begins a critical section.</p></div>\r |
| 82 | </li>\r |
| 83 | <li>\r |
| 84 | <p>\r |
| 85 | <span class="monospaced">atomicEnd ()</span>\r |
| 86 | </p>\r |
| 87 | <div class="paragraph"><p>ends a critical section.</p></div>\r |
| 88 | </li>\r |
| 89 | <li>\r |
| 90 | <p>\r |
| 91 | <span class="monospaced">atomicState ()</span>\r |
| 92 | </p>\r |
| 93 | <div class="paragraph"><p>returns the current atomic state.</p></div>\r |
| 94 | </li>\r |
| 95 | <li>\r |
| 96 | <p>\r |
| 97 | <span class="monospaced">type Runnable.t</span>\r |
| 98 | </p>\r |
| 99 | <div class="paragraph"><p>the type of threads that can be resumed.</p></div>\r |
| 100 | </li>\r |
| 101 | <li>\r |
| 102 | <p>\r |
| 103 | <span class="monospaced">type 'a t</span>\r |
| 104 | </p>\r |
| 105 | <div class="paragraph"><p>the type of threads that expect a value of type <span class="monospaced">'a</span>.</p></div>\r |
| 106 | </li>\r |
| 107 | <li>\r |
| 108 | <p>\r |
| 109 | <span class="monospaced">atomicSwitch f</span>\r |
| 110 | </p>\r |
| 111 | <div class="paragraph"><p>like <span class="monospaced">switch</span>, but assumes an atomic calling context. Upon\r |
| 112 | <span class="monospaced">switch</span>-ing back to the current thread, an implicit <span class="monospaced">atomicEnd</span> is\r |
| 113 | performed.</p></div>\r |
| 114 | </li>\r |
| 115 | <li>\r |
| 116 | <p>\r |
| 117 | <span class="monospaced">new f</span>\r |
| 118 | </p>\r |
| 119 | <div class="paragraph"><p>creates a new thread that, when run, applies <span class="monospaced">f</span> to the value given to\r |
| 120 | the thread. <span class="monospaced">f</span> must terminate by `switch`ing to another thread or\r |
| 121 | exiting the process.</p></div>\r |
| 122 | </li>\r |
| 123 | <li>\r |
| 124 | <p>\r |
| 125 | <span class="monospaced">prepend (t, f)</span>\r |
| 126 | </p>\r |
| 127 | <div class="paragraph"><p>creates a new thread (destroying <span class="monospaced">t</span> in the process) that first\r |
| 128 | applies <span class="monospaced">f</span> to the value given to the thread and then continues with\r |
| 129 | <span class="monospaced">t</span>. This is a constant time operation.</p></div>\r |
| 130 | </li>\r |
| 131 | <li>\r |
| 132 | <p>\r |
| 133 | <span class="monospaced">prepare (t, v)</span>\r |
| 134 | </p>\r |
| 135 | <div class="paragraph"><p>prepares a new runnable thread (destroying <span class="monospaced">t</span> in the process) that\r |
| 136 | will evaluate <span class="monospaced">t</span> on <span class="monospaced">v</span>.</p></div>\r |
| 137 | </li>\r |
| 138 | <li>\r |
| 139 | <p>\r |
| 140 | <span class="monospaced">switch f</span>\r |
| 141 | </p>\r |
| 142 | <div class="paragraph"><p>applies <span class="monospaced">f</span> to the current thread to get <span class="monospaced">rt</span>, and then start running\r |
| 143 | thread <span class="monospaced">rt</span>. It is an error for <span class="monospaced">f</span> to perform another <span class="monospaced">switch</span>. <span class="monospaced">f</span>\r |
| 144 | is guaranteed to run atomically.</p></div>\r |
| 145 | </li>\r |
| 146 | </ul></div>\r |
| 147 | </div>\r |
| 148 | </div>\r |
| 149 | <div class="sect1">\r |
| 150 | <h2 id="_example_of_non_preemptive_threads">Example of non-preemptive threads</h2>\r |
| 151 | <div class="sectionbody">\r |
| 152 | <div class="listingblock">\r |
| 153 | <div class="content"><div class="highlight"><pre><span class="k">structure</span><span class="w"> </span><span class="n">Queue</span><span class="p">:</span><span class="w"></span>\r |
| 154 | <span class="w"> </span><span class="k">sig</span><span class="w"></span>\r |
| 155 | <span class="w"> </span><span class="k">type</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"></span>\r |
| 156 | \r |
| 157 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">new</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"></span>\r |
| 158 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">enque</span><span class="p">:</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="n">*</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="w"></span>\r |
| 159 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">deque</span><span class="p">:</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">option</span><span class="w"></span>\r |
| 160 | <span class="w"> </span><span class="k">end</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 161 | <span class="w"> </span><span class="k">struct</span><span class="w"></span>\r |
| 162 | <span class="w"> </span><span class="k">datatype</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">T</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="p">{</span><span class="n">front</span><span class="p">:</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">list</span><span class="w"> </span><span class="n">ref</span><span class="p">,</span><span class="w"> </span><span class="n">back</span><span class="p">:</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">list</span><span class="w"> </span><span class="n">ref</span><span class="p">}</span><span class="w"></span>\r |
| 163 | \r |
| 164 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">new</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">T</span><span class="w"> </span><span class="p">{</span><span class="n">front</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">ref</span><span class="w"> </span><span class="p">[],</span><span class="w"> </span><span class="n">back</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">ref</span><span class="w"> </span><span class="p">[]}</span><span class="w"></span>\r |
| 165 | \r |
| 166 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">enque</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="w"> </span><span class="p">{</span><span class="n">back</span><span class="p">,</span><span class="w"> </span><span class="p">...},</span><span class="w"> </span><span class="n">x</span><span class="p">)</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">back</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="n">::</span><span class="w"> </span><span class="n">!back</span><span class="w"></span>\r |
| 167 | \r |
| 168 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">deque</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="w"> </span><span class="p">{</span><span class="n">front</span><span class="p">,</span><span class="w"> </span><span class="n">back</span><span class="p">})</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 169 | <span class="w"> </span><span class="k">case</span><span class="w"> </span><span class="n">!front</span><span class="w"> </span><span class="k">of</span><span class="w"></span>\r |
| 170 | <span class="w"> </span><span class="p">[]</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">(</span><span class="k">case</span><span class="w"> </span><span class="n">!back</span><span class="w"> </span><span class="k">of</span><span class="w"></span>\r |
| 171 | <span class="w"> </span><span class="p">[]</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">NONE</span><span class="w"></span>\r |
| 172 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">l</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">l</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">rev</span><span class="w"> </span><span class="n">l</span><span class="w"></span>\r |
| 173 | <span class="w"> </span><span class="k">in</span><span class="w"> </span><span class="k">case</span><span class="w"> </span><span class="n">l</span><span class="w"> </span><span class="k">of</span><span class="w"></span>\r |
| 174 | <span class="w"> </span><span class="p">[]</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="k">raise</span><span class="w"> </span><span class="n">Fail</span><span class="w"> </span><span class="s">"deque"</span><span class="w"></span>\r |
| 175 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="n">::</span><span class="w"> </span><span class="n">l</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">(</span><span class="n">back</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="p">[];</span><span class="w"> </span><span class="n">front</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="n">l</span><span class="p">;</span><span class="w"> </span><span class="n">SOME</span><span class="w"> </span><span class="n">x</span><span class="p">)</span><span class="w"></span>\r |
| 176 | <span class="w"> </span><span class="k">end</span><span class="p">)</span><span class="w"></span>\r |
| 177 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="n">::</span><span class="w"> </span><span class="n">l</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">(</span><span class="n">front</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="n">l</span><span class="p">;</span><span class="w"> </span><span class="n">SOME</span><span class="w"> </span><span class="n">x</span><span class="p">)</span><span class="w"></span>\r |
| 178 | <span class="w"> </span><span class="k">end</span><span class="w"></span>\r |
| 179 | \r |
| 180 | <span class="k">structure</span><span class="w"> </span><span class="n">Thread</span><span class="p">:</span><span class="w"></span>\r |
| 181 | <span class="w"> </span><span class="k">sig</span><span class="w"></span>\r |
| 182 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">exit</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"></span>\r |
| 183 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">run</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="w"></span>\r |
| 184 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">spawn</span><span class="p">:</span><span class="w"> </span><span class="p">(</span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="p">)</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="w"></span>\r |
| 185 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">yield</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="w"></span>\r |
| 186 | <span class="w"> </span><span class="k">end</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 187 | <span class="w"> </span><span class="k">struct</span><span class="w"></span>\r |
| 188 | <span class="w"> </span><span class="k">open</span><span class="w"> </span><span class="n">MLton</span><span class="w"></span>\r |
| 189 | <span class="w"> </span><span class="k">open</span><span class="w"> </span><span class="n">Thread</span><span class="w"></span>\r |
| 190 | \r |
| 191 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">topLevel</span><span class="p">:</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="w"> </span><span class="n">option</span><span class="w"> </span><span class="n">ref</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">ref</span><span class="w"> </span><span class="n">NONE</span><span class="w"></span>\r |
| 192 | \r |
| 193 | <span class="w"> </span><span class="k">local</span><span class="w"></span>\r |
| 194 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">threads</span><span class="p">:</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="w"> </span><span class="n">Queue</span><span class="p">.</span><span class="n">t</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">Queue</span><span class="p">.</span><span class="n">new</span><span class="w"> </span><span class="p">()</span><span class="w"></span>\r |
| 195 | <span class="w"> </span><span class="k">in</span><span class="w"></span>\r |
| 196 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">ready</span><span class="w"> </span><span class="p">(</span><span class="n">t</span><span class="p">:</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="p">)</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 197 | <span class="w"> </span><span class="n">Queue</span><span class="p">.</span><span class="n">enque</span><span class="p">(</span><span class="n">threads</span><span class="p">,</span><span class="w"> </span><span class="n">t</span><span class="p">)</span><span class="w"></span>\r |
| 198 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">next</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 199 | <span class="w"> </span><span class="k">case</span><span class="w"> </span><span class="n">Queue</span><span class="p">.</span><span class="n">deque</span><span class="w"> </span><span class="n">threads</span><span class="w"> </span><span class="k">of</span><span class="w"></span>\r |
| 200 | <span class="w"> </span><span class="n">NONE</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">valOf</span><span class="w"> </span><span class="p">(</span><span class="n">!topLevel</span><span class="p">)</span><span class="w"></span>\r |
| 201 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">SOME</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">t</span><span class="w"></span>\r |
| 202 | <span class="w"> </span><span class="k">end</span><span class="w"></span>\r |
| 203 | \r |
| 204 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">exit</span><span class="w"> </span><span class="p">():</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">switch</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="p">_</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">next</span><span class="w"> </span><span class="p">())</span><span class="w"></span>\r |
| 205 | \r |
| 206 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">new</span><span class="w"> </span><span class="p">(</span><span class="n">f</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="p">):</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 207 | <span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">prepare</span><span class="w"></span>\r |
| 208 | <span class="w"> </span><span class="p">(</span><span class="n">Thread</span><span class="p">.</span><span class="n">new</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">((</span><span class="n">f</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="k">handle</span><span class="w"> </span><span class="p">_</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">exit</span><span class="w"> </span><span class="p">())</span><span class="w"></span>\r |
| 209 | <span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">exit</span><span class="w"> </span><span class="p">())),</span><span class="w"></span>\r |
| 210 | <span class="w"> </span><span class="p">())</span><span class="w"></span>\r |
| 211 | \r |
| 212 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">schedule</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="n">ready</span><span class="w"> </span><span class="n">t</span><span class="p">;</span><span class="w"> </span><span class="n">next</span><span class="w"> </span><span class="p">())</span><span class="w"></span>\r |
| 213 | \r |
| 214 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">yield</span><span class="w"> </span><span class="p">():</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">switch</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">schedule</span><span class="w"> </span><span class="p">(</span><span class="n">Thread</span><span class="p">.</span><span class="n">prepare</span><span class="w"> </span><span class="p">(</span><span class="n">t</span><span class="p">,</span><span class="w"> </span><span class="p">())))</span><span class="w"></span>\r |
| 215 | \r |
| 216 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">spawn</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">ready</span><span class="w"> </span><span class="n">o</span><span class="w"> </span><span class="n">new</span><span class="w"></span>\r |
| 217 | \r |
| 218 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">run</span><span class="p">():</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 219 | <span class="w"> </span><span class="p">(</span><span class="n">switch</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">=></span><span class="w"></span>\r |
| 220 | <span class="w"> </span><span class="p">(</span><span class="n">topLevel</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="n">SOME</span><span class="w"> </span><span class="p">(</span><span class="n">Thread</span><span class="p">.</span><span class="n">prepare</span><span class="w"> </span><span class="p">(</span><span class="n">t</span><span class="p">,</span><span class="w"> </span><span class="p">()))</span><span class="w"></span>\r |
| 221 | <span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">next</span><span class="p">()))</span><span class="w"></span>\r |
| 222 | <span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">topLevel</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="n">NONE</span><span class="p">)</span><span class="w"></span>\r |
| 223 | <span class="w"> </span><span class="k">end</span><span class="w"></span>\r |
| 224 | \r |
| 225 | <span class="k">val</span><span class="w"> </span><span class="k">rec</span><span class="w"> </span><span class="n">loop</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 226 | <span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">()</span><span class="w"></span>\r |
| 227 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">(</span><span class="n">print</span><span class="p">(</span><span class="n">concat</span><span class="p">[</span><span class="n">Int</span><span class="p">.</span><span class="n">toString</span><span class="w"> </span><span class="n">n</span><span class="p">,</span><span class="w"> </span><span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">])</span><span class="w"></span>\r |
| 228 | <span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">yield</span><span class="p">()</span><span class="w"></span>\r |
| 229 | <span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">loop</span><span class="p">(</span><span class="n">n</span><span class="w"> </span><span class="n">-</span><span class="w"> </span><span class="mi">1</span><span class="p">))</span><span class="w"></span>\r |
| 230 | \r |
| 231 | <span class="k">val</span><span class="w"> </span><span class="k">rec</span><span class="w"> </span><span class="n">loop'</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 232 | <span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">()</span><span class="w"></span>\r |
| 233 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">(</span><span class="n">Thread</span><span class="p">.</span><span class="n">spawn</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">loop</span><span class="w"> </span><span class="n">n</span><span class="p">);</span><span class="w"> </span><span class="n">loop'</span><span class="w"> </span><span class="p">(</span><span class="n">n</span><span class="w"> </span><span class="n">-</span><span class="w"> </span><span class="mi">2</span><span class="p">))</span><span class="w"></span>\r |
| 234 | \r |
| 235 | <span class="k">val</span><span class="w"> </span><span class="p">_</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">spawn</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">loop'</span><span class="w"> </span><span class="mi">10</span><span class="p">)</span><span class="w"></span>\r |
| 236 | \r |
| 237 | <span class="k">val</span><span class="w"> </span><span class="p">_</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">run</span><span class="w"> </span><span class="p">()</span><span class="w"></span>\r |
| 238 | \r |
| 239 | <span class="k">val</span><span class="w"> </span><span class="p">_</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">print</span><span class="w"> </span><span class="s">"success</span><span class="se">\n</span><span class="s">"</span><span class="w"></span>\r |
| 240 | </pre></div></div></div>\r |
| 241 | </div>\r |
| 242 | </div>\r |
| 243 | <div class="sect1">\r |
| 244 | <h2 id="_example_of_preemptive_threads">Example of preemptive threads</h2>\r |
| 245 | <div class="sectionbody">\r |
| 246 | <div class="listingblock">\r |
| 247 | <div class="content"><div class="highlight"><pre><span class="k">structure</span><span class="w"> </span><span class="n">Queue</span><span class="p">:</span><span class="w"></span>\r |
| 248 | <span class="w"> </span><span class="k">sig</span><span class="w"></span>\r |
| 249 | <span class="w"> </span><span class="k">type</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"></span>\r |
| 250 | \r |
| 251 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">new</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"></span>\r |
| 252 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">enque</span><span class="p">:</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="n">*</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="w"></span>\r |
| 253 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">deque</span><span class="p">:</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">option</span><span class="w"></span>\r |
| 254 | <span class="w"> </span><span class="k">end</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 255 | <span class="w"> </span><span class="k">struct</span><span class="w"></span>\r |
| 256 | <span class="w"> </span><span class="k">datatype</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">T</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="p">{</span><span class="n">front</span><span class="p">:</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">list</span><span class="w"> </span><span class="n">ref</span><span class="p">,</span><span class="w"> </span><span class="n">back</span><span class="p">:</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">list</span><span class="w"> </span><span class="n">ref</span><span class="p">}</span><span class="w"></span>\r |
| 257 | \r |
| 258 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">new</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">T</span><span class="w"> </span><span class="p">{</span><span class="n">front</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">ref</span><span class="w"> </span><span class="p">[],</span><span class="w"> </span><span class="n">back</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">ref</span><span class="w"> </span><span class="p">[]}</span><span class="w"></span>\r |
| 259 | \r |
| 260 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">enque</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="w"> </span><span class="p">{</span><span class="n">back</span><span class="p">,</span><span class="w"> </span><span class="p">...},</span><span class="w"> </span><span class="n">x</span><span class="p">)</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">back</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="n">::</span><span class="w"> </span><span class="n">!back</span><span class="w"></span>\r |
| 261 | \r |
| 262 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">deque</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="w"> </span><span class="p">{</span><span class="n">front</span><span class="p">,</span><span class="w"> </span><span class="n">back</span><span class="p">})</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 263 | <span class="w"> </span><span class="k">case</span><span class="w"> </span><span class="n">!front</span><span class="w"> </span><span class="k">of</span><span class="w"></span>\r |
| 264 | <span class="w"> </span><span class="p">[]</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">(</span><span class="k">case</span><span class="w"> </span><span class="n">!back</span><span class="w"> </span><span class="k">of</span><span class="w"></span>\r |
| 265 | <span class="w"> </span><span class="p">[]</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">NONE</span><span class="w"></span>\r |
| 266 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">l</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">l</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">rev</span><span class="w"> </span><span class="n">l</span><span class="w"></span>\r |
| 267 | <span class="w"> </span><span class="k">in</span><span class="w"> </span><span class="k">case</span><span class="w"> </span><span class="n">l</span><span class="w"> </span><span class="k">of</span><span class="w"></span>\r |
| 268 | <span class="w"> </span><span class="p">[]</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="k">raise</span><span class="w"> </span><span class="n">Fail</span><span class="w"> </span><span class="s">"deque"</span><span class="w"></span>\r |
| 269 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="n">::</span><span class="w"> </span><span class="n">l</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">(</span><span class="n">back</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="p">[];</span><span class="w"> </span><span class="n">front</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="n">l</span><span class="p">;</span><span class="w"> </span><span class="n">SOME</span><span class="w"> </span><span class="n">x</span><span class="p">)</span><span class="w"></span>\r |
| 270 | <span class="w"> </span><span class="k">end</span><span class="p">)</span><span class="w"></span>\r |
| 271 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="n">::</span><span class="w"> </span><span class="n">l</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">(</span><span class="n">front</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="n">l</span><span class="p">;</span><span class="w"> </span><span class="n">SOME</span><span class="w"> </span><span class="n">x</span><span class="p">)</span><span class="w"></span>\r |
| 272 | <span class="w"> </span><span class="k">end</span><span class="w"></span>\r |
| 273 | \r |
| 274 | <span class="k">structure</span><span class="w"> </span><span class="n">Thread</span><span class="p">:</span><span class="w"></span>\r |
| 275 | <span class="w"> </span><span class="k">sig</span><span class="w"></span>\r |
| 276 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">exit</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">'a</span><span class="w"></span>\r |
| 277 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">run</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="w"></span>\r |
| 278 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">spawn</span><span class="p">:</span><span class="w"> </span><span class="p">(</span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="p">)</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="w"></span>\r |
| 279 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">yield</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="w"></span>\r |
| 280 | <span class="w"> </span><span class="k">end</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 281 | <span class="w"> </span><span class="k">struct</span><span class="w"></span>\r |
| 282 | <span class="w"> </span><span class="k">open</span><span class="w"> </span><span class="n">Posix</span><span class="p">.</span><span class="n">Signal</span><span class="w"></span>\r |
| 283 | <span class="w"> </span><span class="k">open</span><span class="w"> </span><span class="n">MLton</span><span class="w"></span>\r |
| 284 | <span class="w"> </span><span class="k">open</span><span class="w"> </span><span class="n">Itimer</span><span class="w"> </span><span class="n">Signal</span><span class="w"> </span><span class="n">Thread</span><span class="w"></span>\r |
| 285 | \r |
| 286 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">topLevel</span><span class="p">:</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="w"> </span><span class="n">option</span><span class="w"> </span><span class="n">ref</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">ref</span><span class="w"> </span><span class="n">NONE</span><span class="w"></span>\r |
| 287 | \r |
| 288 | <span class="w"> </span><span class="k">local</span><span class="w"></span>\r |
| 289 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">threads</span><span class="p">:</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="w"> </span><span class="n">Queue</span><span class="p">.</span><span class="n">t</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">Queue</span><span class="p">.</span><span class="n">new</span><span class="w"> </span><span class="p">()</span><span class="w"></span>\r |
| 290 | <span class="w"> </span><span class="k">in</span><span class="w"></span>\r |
| 291 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">ready</span><span class="w"> </span><span class="p">(</span><span class="n">t</span><span class="p">:</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="p">)</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 292 | <span class="w"> </span><span class="n">Queue</span><span class="p">.</span><span class="n">enque</span><span class="p">(</span><span class="n">threads</span><span class="p">,</span><span class="w"> </span><span class="n">t</span><span class="p">)</span><span class="w"></span>\r |
| 293 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">next</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 294 | <span class="w"> </span><span class="k">case</span><span class="w"> </span><span class="n">Queue</span><span class="p">.</span><span class="n">deque</span><span class="w"> </span><span class="n">threads</span><span class="w"> </span><span class="k">of</span><span class="w"></span>\r |
| 295 | <span class="w"> </span><span class="n">NONE</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">valOf</span><span class="w"> </span><span class="p">(</span><span class="n">!topLevel</span><span class="p">)</span><span class="w"></span>\r |
| 296 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">SOME</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">t</span><span class="w"></span>\r |
| 297 | <span class="w"> </span><span class="k">end</span><span class="w"></span>\r |
| 298 | \r |
| 299 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="n">exit</span><span class="w"> </span><span class="p">():</span><span class="w"> </span><span class="n">'a</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">switch</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="p">_</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">next</span><span class="w"> </span><span class="p">())</span><span class="w"></span>\r |
| 300 | \r |
| 301 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">new</span><span class="w"> </span><span class="p">(</span><span class="n">f</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="n">unit</span><span class="p">):</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">Runnable</span><span class="p">.</span><span class="n">t</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 302 | <span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">prepare</span><span class="w"></span>\r |
| 303 | <span class="w"> </span><span class="p">(</span><span class="n">Thread</span><span class="p">.</span><span class="n">new</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">((</span><span class="n">f</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="k">handle</span><span class="w"> </span><span class="p">_</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">exit</span><span class="w"> </span><span class="p">())</span><span class="w"></span>\r |
| 304 | <span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">exit</span><span class="w"> </span><span class="p">())),</span><span class="w"></span>\r |
| 305 | <span class="w"> </span><span class="p">())</span><span class="w"></span>\r |
| 306 | \r |
| 307 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">schedule</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">(</span><span class="n">ready</span><span class="w"> </span><span class="n">t</span><span class="p">;</span><span class="w"> </span><span class="n">next</span><span class="w"> </span><span class="p">())</span><span class="w"></span>\r |
| 308 | \r |
| 309 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">yield</span><span class="w"> </span><span class="p">():</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">switch</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">schedule</span><span class="w"> </span><span class="p">(</span><span class="n">Thread</span><span class="p">.</span><span class="n">prepare</span><span class="w"> </span><span class="p">(</span><span class="n">t</span><span class="p">,</span><span class="w"> </span><span class="p">())))</span><span class="w"></span>\r |
| 310 | \r |
| 311 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">spawn</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">ready</span><span class="w"> </span><span class="n">o</span><span class="w"> </span><span class="n">new</span><span class="w"></span>\r |
| 312 | \r |
| 313 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">setItimer</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 314 | <span class="w"> </span><span class="n">Itimer</span><span class="p">.</span><span class="n">set</span><span class="w"> </span><span class="p">(</span><span class="n">Itimer</span><span class="p">.</span><span class="n">Real</span><span class="p">,</span><span class="w"></span>\r |
| 315 | <span class="w"> </span><span class="p">{</span><span class="n">value</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">t</span><span class="p">,</span><span class="w"></span>\r |
| 316 | <span class="w"> </span><span class="n">interval</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">t</span><span class="p">})</span><span class="w"></span>\r |
| 317 | \r |
| 318 | <span class="w"> </span><span class="k">fun</span><span class="w"> </span><span class="n">run</span><span class="w"> </span><span class="p">():</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 319 | <span class="w"> </span><span class="p">(</span><span class="n">switch</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="p">=></span><span class="w"></span>\r |
| 320 | <span class="w"> </span><span class="p">(</span><span class="n">topLevel</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="n">SOME</span><span class="w"> </span><span class="p">(</span><span class="n">Thread</span><span class="p">.</span><span class="n">prepare</span><span class="w"> </span><span class="p">(</span><span class="n">t</span><span class="p">,</span><span class="w"> </span><span class="p">()))</span><span class="w"></span>\r |
| 321 | <span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">new</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">(</span><span class="n">setHandler</span><span class="w"> </span><span class="p">(</span><span class="n">alrm</span><span class="p">,</span><span class="w"> </span><span class="n">Handler</span><span class="p">.</span><span class="n">handler</span><span class="w"> </span><span class="n">schedule</span><span class="p">)</span><span class="w"></span>\r |
| 322 | <span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">setItimer</span><span class="w"> </span><span class="p">(</span><span class="n">Time</span><span class="p">.</span><span class="n">fromMilliseconds</span><span class="w"> </span><span class="mi">20</span><span class="p">)))))</span><span class="w"></span>\r |
| 323 | <span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">setItimer</span><span class="w"> </span><span class="n">Time</span><span class="p">.</span><span class="n">zeroTime</span><span class="w"></span>\r |
| 324 | <span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">ignore</span><span class="w"> </span><span class="n">alrm</span><span class="w"></span>\r |
| 325 | <span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">topLevel</span><span class="w"> </span><span class="n">:=</span><span class="w"> </span><span class="n">NONE</span><span class="p">)</span><span class="w"></span>\r |
| 326 | <span class="w"> </span><span class="k">end</span><span class="w"></span>\r |
| 327 | \r |
| 328 | <span class="k">val</span><span class="w"> </span><span class="k">rec</span><span class="w"> </span><span class="n">delay</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 329 | <span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">()</span><span class="w"></span>\r |
| 330 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">delay</span><span class="w"> </span><span class="p">(</span><span class="n">n</span><span class="w"> </span><span class="n">-</span><span class="w"> </span><span class="mi">1</span><span class="p">)</span><span class="w"></span>\r |
| 331 | \r |
| 332 | <span class="k">val</span><span class="w"> </span><span class="k">rec</span><span class="w"> </span><span class="n">loop</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 333 | <span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">()</span><span class="w"></span>\r |
| 334 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">(</span><span class="n">delay</span><span class="w"> </span><span class="mi">500000</span><span class="p">;</span><span class="w"> </span><span class="n">loop</span><span class="w"> </span><span class="p">(</span><span class="n">n</span><span class="w"> </span><span class="n">-</span><span class="w"> </span><span class="mi">1</span><span class="p">))</span><span class="w"></span>\r |
| 335 | \r |
| 336 | <span class="k">val</span><span class="w"> </span><span class="k">rec</span><span class="w"> </span><span class="n">loop'</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r |
| 337 | <span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">()</span><span class="w"></span>\r |
| 338 | <span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">(</span><span class="n">Thread</span><span class="p">.</span><span class="n">spawn</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">loop</span><span class="w"> </span><span class="n">n</span><span class="p">);</span><span class="w"> </span><span class="n">loop'</span><span class="w"> </span><span class="p">(</span><span class="n">n</span><span class="w"> </span><span class="n">-</span><span class="w"> </span><span class="mi">1</span><span class="p">))</span><span class="w"></span>\r |
| 339 | \r |
| 340 | <span class="k">val</span><span class="w"> </span><span class="p">_</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">spawn</span><span class="w"> </span><span class="p">(</span><span class="k">fn</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="n">loop'</span><span class="w"> </span><span class="mi">10</span><span class="p">)</span><span class="w"></span>\r |
| 341 | \r |
| 342 | <span class="k">val</span><span class="w"> </span><span class="p">_</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">Thread</span><span class="p">.</span><span class="n">run</span><span class="w"> </span><span class="p">()</span><span class="w"></span>\r |
| 343 | \r |
| 344 | <span class="k">val</span><span class="w"> </span><span class="p">_</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="n">print</span><span class="w"> </span><span class="s">"success</span><span class="se">\n</span><span class="s">"</span><span class="w"></span>\r |
| 345 | </pre></div></div></div>\r |
| 346 | </div>\r |
| 347 | </div>\r |
| 348 | </div>\r |
| 349 | <div id="footnotes"><hr></div>\r |
| 350 | <div id="footer">\r |
| 351 | <div id="footer-text">\r |
| 352 | </div>\r |
| 353 | <div id="footer-badges">\r |
| 354 | </div>\r |
| 355 | </div>\r |
| 356 | </body>\r |
| 357 | </html>\r |