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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 |