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/* Copyright (C) 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
/* This file does some pretty hairy #inclusion. It probably seemed
like a good idea at the time, but it doesn't now. Here's the
structure, edited for relevance (!), last I checked:
threads.c:
threads.h
coop-defs.h
iselect.h
coop-threads.c
coop-threads.h
coop-defs.h*
../qt/qt.h
coop.c
<qt.h>
* second #inclusion
*/
#include <stdio.h>
#include "libguile/_scm.h"
#include "libguile/dynwind.h"
#include "libguile/smob.h"
#include "libguile/threads.h"
long scm_tc16_thread;
long scm_tc16_mutex;
long scm_tc16_condvar;
/* Scheme-visible thread functions. */
#ifdef USE_COOP_THREADS
SCM_REGISTER_PROC(s_single_thread_p, "single-active-thread?", 0, 0, 0, scm_single_thread_p);
#endif
/* GJB:FIXME:DOC: SCM_REGISTER_PROC needs to permit a docstring,
or these need to move into the file where the proc is defined. */
SCM_REGISTER_PROC(s_yield, "yield", 0, 0, 0, scm_yield);
/* If one or more threads are waiting to execute, calling yield forces an
immediate context switch to one of them. Otherwise, yield has no effect.
*/
SCM_REGISTER_PROC(s_call_with_new_thread, "call-with-new-thread", 0, 0, 1, scm_call_with_new_thread);
/* Evaluate @var{(thunk)} in a new thread, and new dynamic context,
returning a new thread object representing the thread.
If an error occurs during evaluation, call error-thunk, passing it an
error code describing the condition. [Error codes are currently
meaningless integers. In the future, real values will be specified.]
If this happens, the error-thunk is called outside the scope of the new
root -- it is called in the same dynamic context in which
with-new-thread was evaluated, but not in the callers thread.
All the evaluation rules for dynamic roots apply to threads.
*/
SCM_REGISTER_PROC(s_join_thread, "join-thread", 1, 0, 0, scm_join_thread);
/* Suspend execution of the calling thread until the target @var{thread}
terminates, unless the target @var{thread} has already terminated.
*/
SCM_REGISTER_PROC(s_make_mutex, "make-mutex", 0, 0, 0, scm_make_mutex);
/* Create a new mutex object. */
SCM_REGISTER_PROC(s_lock_mutex, "lock-mutex", 1, 0, 0, scm_lock_mutex);
/* Lock @var{mutex}. If the mutex is already locked, the calling thread
blocks until the mutex becomes available. The function returns when
the calling thread owns the lock on @var{mutex}. */
SCM_REGISTER_PROC(s_unlock_mutex, "unlock-mutex", 1, 0, 0, scm_unlock_mutex);
/* Unlocks @var{mutex} if the calling thread owns the lock on @var{mutex}.
Calling unlock-mutex on a mutex not owned by the current thread results
in undefined behaviour. Once a mutex has been unlocked, one thread
blocked on @var{mutex} is awakened and grabs the mutex lock. */
SCM_REGISTER_PROC(s_make_condition_variable, "make-condition-variable", 0, 0, 0, scm_make_condition_variable);
SCM_REGISTER_PROC(s_wait_condition_variable, "wait-condition-variable", 2, 0, 0, scm_wait_condition_variable);
SCM_REGISTER_PROC(s_signal_condition_variable, "signal-condition-variable", 1, 0, 0, scm_signal_condition_variable);
#ifdef USE_COOP_THREADS
#include "libguile/coop-threads.c"
#endif
void
scm_init_threads (SCM_STACKITEM *i)
{
scm_tc16_thread = scm_make_smob_type ("thread", 0);
scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (coop_m));
scm_tc16_condvar = scm_make_smob_type ("condition-variable", sizeof (coop_c));
#ifndef SCM_MAGIC_SNARFER
#include "libguile/threads.x"
#endif
/* Initialize implementation specific details of the threads support */
scm_threads_init (i);
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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