1 /* Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2, or (at your option)
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this software; see the file COPYING. If not, write to
15 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
21 * The exception is that, if you link the GUILE library with other files
22 * to produce an executable, this does not by itself cause the
23 * resulting executable to be covered by the GNU General Public License.
24 * Your use of that executable is in no way restricted on account of
25 * linking the GUILE library code into it.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
30 * This exception applies only to the code released by the
31 * Free Software Foundation under the name GUILE. If you copy
32 * code from other Free Software Foundation releases into a copy of
33 * GUILE, as the General Public License permits, the exception does
34 * not apply to the code that you add in this way. To avoid misleading
35 * anyone as to the status of such modified files, you must delete
36 * this exception notice from them.
38 * If you write modifications of your own for GUILE, it is your choice
39 * whether to permit this exception to apply to your modifications.
40 * If you do not wish that, delete this exception notice. */
42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
43 gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
47 /* This file does some pretty hairy #inclusion. It probably seemed
48 like a good idea at the time, but it doesn't now. Here's the
49 structure, edited for relevance (!), last I checked:
79 long scm_tc16_condvar
;
82 /* Scheme-visible thread functions. */
84 #ifdef USE_COOP_THREADS
85 SCM_REGISTER_PROC(s_single_thread_p
, "single-active-thread?", 0, 0, 0, scm_single_thread_p
);
88 /* GJB:FIXME:DOC: SCM_REGISTER_PROC needs to permit a docstring,
89 or these need to move into the file where the proc is defined. */
91 SCM_REGISTER_PROC(s_yield
, "yield", 0, 0, 0, scm_yield
);
92 /* If one or more threads are waiting to execute, calling yield forces an
93 immediate context switch to one of them. Otherwise, yield has no effect.
96 SCM_REGISTER_PROC(s_call_with_new_thread
, "call-with-new-thread", 0, 0, 1, scm_call_with_new_thread
);
97 /* Evaluate @var{(thunk)} in a new thread, and new dynamic context,
98 returning a new thread object representing the thread.
100 If an error occurs during evaluation, call error-thunk, passing it an
101 error code describing the condition. [Error codes are currently
102 meaningless integers. In the future, real values will be specified.]
103 If this happens, the error-thunk is called outside the scope of the new
104 root -- it is called in the same dynamic context in which
105 with-new-thread was evaluated, but not in the callers thread.
107 All the evaluation rules for dynamic roots apply to threads.
110 SCM_REGISTER_PROC(s_join_thread
, "join-thread", 1, 0, 0, scm_join_thread
);
111 /* Suspend execution of the calling thread until the target @var{thread}
112 terminates, unless the target @var{thread} has already terminated.
115 SCM_REGISTER_PROC(s_make_mutex
, "make-mutex", 0, 0, 0, scm_make_mutex
);
116 /* Create a new mutex object. */
118 SCM_REGISTER_PROC(s_lock_mutex
, "lock-mutex", 1, 0, 0, scm_lock_mutex
);
119 /* Lock @var{mutex}. If the mutex is already locked, the calling thread
120 blocks until the mutex becomes available. The function returns when
121 the calling thread owns the lock on @var{mutex}. */
123 SCM_REGISTER_PROC(s_unlock_mutex
, "unlock-mutex", 1, 0, 0, scm_unlock_mutex
);
124 /* Unlocks @var{mutex} if the calling thread owns the lock on @var{mutex}.
125 Calling unlock-mutex on a mutex not owned by the current thread results
126 in undefined behaviour. Once a mutex has been unlocked, one thread
127 blocked on @var{mutex} is awakened and grabs the mutex lock. */
129 SCM_REGISTER_PROC(s_make_condition_variable
, "make-condition-variable", 0, 0, 0, scm_make_condition_variable
);
131 SCM_REGISTER_PROC(s_wait_condition_variable
, "wait-condition-variable", 2, 0, 0, scm_wait_condition_variable
);
133 SCM_REGISTER_PROC(s_signal_condition_variable
, "signal-condition-variable", 1, 0, 0, scm_signal_condition_variable
);
137 #ifdef USE_MIT_PTHREADS
138 #include "mit-pthreads.c"
141 #ifdef USE_COOP_THREADS
142 #include "coop-threads.c"
148 scm_init_threads (SCM_STACKITEM
*i
)
150 scm_tc16_thread
= scm_make_smob_type ("thread", sizeof (coop_t
));
151 scm_tc16_mutex
= scm_make_smob_type ("mutex", sizeof (coop_m
));
152 scm_tc16_condvar
= scm_make_smob_type ("condition-variable", sizeof (coop_c
));
155 /* Initialize implementation specific details of the threads support */
156 scm_threads_init (i
);