mirror of
https://git.savannah.gnu.org/git/guile.git
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306 lines
7.7 KiB
C
306 lines
7.7 KiB
C
/* Copyright (C) 2002 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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#include "libguile/scmconfig.h"
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scm_t_mutexattr scm_i_plugin_mutex;
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scm_t_mutexattr scm_i_plugin_rec_mutex;
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#if !defined (SCM_MUTEX_RECURSIVE) || defined (SCM_DEBUG_THREADS)
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typedef struct rec_mutex {
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#ifdef SCM_DEBUG_THREADS
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int kind;
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#endif
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scm_t_mutex mutex;
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scm_thread *owner;
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int count;
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} rec_mutex;
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/* Mutex for recursive mutex administration */
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static scm_t_mutex rec_mutex_mutex;
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#ifdef SCM_DEBUG_THREADS
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#define FAST_MUTEX 1
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#define REC_MUTEX 2
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typedef struct mutex {
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#ifdef SCM_DEBUG_THREADS
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int kind;
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#endif
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pthread_mutex_t mutex;
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scm_thread *owner;
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int count;
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} mutex;
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static pthread_mutex_t mutex_mutex;
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int
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scm_i_plugin_mutex_init (scm_t_mutex *mx, const scm_t_mutexattr *a)
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{
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mutex *m = (mutex *) mx;
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pthread_mutex_init (&m->mutex, &scm_i_plugin_mutex);
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m->owner = 0;
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m->count = 0;
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m->kind = FAST_MUTEX;
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return 0;
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}
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int
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scm_i_plugin_mutex_lock (scm_t_mutex *mx)
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{
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mutex *m = (mutex *) mx;
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scm_thread *t = SCM_CURRENT_THREAD;
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pthread_mutex_lock (&mutex_mutex);
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if (m->kind != FAST_MUTEX)
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{
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fprintf (stderr,
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m->kind == REC_MUTEX
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? "locking wrong mutex type\n"
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: "locking uninitialized mutex\n");
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abort ();
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}
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if (m->owner == t)
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{
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fprintf (stderr, "locking mutex already locked by self\n");
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abort ();
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}
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pthread_mutex_unlock (&mutex_mutex);
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pthread_mutex_lock (&m->mutex);
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m->count = 1;
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m->owner = t;
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return 0;
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}
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int
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scm_i_plugin_mutex_unlock (scm_t_mutex *mx)
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{
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mutex *m = (mutex *) mx;
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pthread_mutex_lock (&mutex_mutex);
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if (m->kind != FAST_MUTEX)
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{
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fprintf (stderr,
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m->kind == REC_MUTEX
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? "locking wrong mutex type\n"
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: "locking uninitialized mutex\n");
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abort ();
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}
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if (m->count != 1)
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{
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fprintf (stderr,
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m->count == 0
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? "unlocking unlocked mutex\n"
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: "bogus internal state");
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abort ();
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}
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m->owner = 0;
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m->count = 0;
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pthread_mutex_unlock (&m->mutex);
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pthread_mutex_unlock (&mutex_mutex);
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return 0;
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}
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int
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scm_i_plugin_cond_wait (scm_t_cond *c, scm_t_mutex *mx)
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{
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mutex *m = (mutex *) mx;
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return pthread_cond_wait ((pthread_cond_t *) c, m->mutex);
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}
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int
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scm_i_plugin_cond_wait (scm_t_cond *c,
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scm_t_mutex *mx,
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const struct timespec *t)
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{
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mutex *m = (mutex *) mx;
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return pthread_cond_timedwait ((pthread_cond_t *) c, m->mutex, t);
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}
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#endif
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/* The following section belongs in threads.c, or rather
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thread-plugin.c. It is generic and not tied to any particular
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thread library. */
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int
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scm_i_plugin_rec_mutex_init (scm_t_rec_mutex *mx, const scm_t_mutexattr *a)
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{
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rec_mutex *m = (rec_mutex *) mx;
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scm_i_plugin_mutex_init (&m->mutex, &scm_i_plugin_mutex);
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m->owner = 0;
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m->count = 0;
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#ifdef SCM_DEBUG_THREADS
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m->kind = REC_MUTEX;
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#endif
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return 0;
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}
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int
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scm_i_plugin_rec_mutex_lock (scm_t_rec_mutex *mx)
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{
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rec_mutex *m = (rec_mutex *) mx;
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scm_thread *t = SCM_CURRENT_THREAD;
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scm_i_plugin_mutex_lock (&rec_mutex_mutex);
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#ifdef SCM_DEBUG_THREADS
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if (m->kind != REC_MUTEX)
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{
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fprintf (stderr,
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m->kind == FAST_MUTEX
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? "locking wrong mutex type\n"
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: "locking uninitialized mutex\n");
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abort ();
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}
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#endif
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if (m->count && m->owner == t)
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{
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++m->count;
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scm_i_plugin_mutex_unlock (&rec_mutex_mutex);
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}
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else
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{
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scm_i_plugin_mutex_unlock (&rec_mutex_mutex);
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scm_i_plugin_mutex_lock (&m->mutex);
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m->count = 1;
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m->owner = t;
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}
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return 0;
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}
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int
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scm_i_plugin_rec_mutex_trylock (scm_t_rec_mutex *mx)
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{
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rec_mutex *m = (rec_mutex *) mx;
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scm_thread *t = SCM_CURRENT_THREAD;
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scm_i_plugin_mutex_lock (&rec_mutex_mutex);
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if (m->owner != 0 && m->owner != t)
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return EBUSY;
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else if (m->count)
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{
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++m->count;
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scm_i_plugin_mutex_unlock (&rec_mutex_mutex);
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}
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else
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{
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scm_i_plugin_mutex_unlock (&rec_mutex_mutex);
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scm_i_plugin_mutex_lock (&m->mutex);
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m->count = 1;
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m->owner = t;
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}
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return 0;
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}
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int
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scm_i_plugin_rec_mutex_unlock (scm_t_rec_mutex *mx)
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{
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rec_mutex *m = (rec_mutex *) mx;
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scm_i_plugin_mutex_lock (&rec_mutex_mutex);
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#ifdef SCM_DEBUG_THREADS
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if (m->kind != REC_MUTEX)
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{
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fprintf (stderr,
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m->kind == FAST_MUTEX
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? "locking wrong mutex type\n"
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: "locking uninitialized mutex\n");
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abort ();
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}
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if (m->count == 0)
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{
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fprintf (stderr, "unlocking unlocked mutex\n");
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abort ();
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}
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#endif
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if (!--m->count)
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{
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m->owner = 0;
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scm_i_plugin_mutex_unlock (&m->mutex);
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}
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scm_i_plugin_mutex_unlock (&rec_mutex_mutex);
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return 0;
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}
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#endif /* !PTHREAD_MUTEX_RECURSIVE */
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#ifndef SCM_MUTEXATTR_SETTYPE_DECLARED
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int pthread_mutexattr_settype (pthread_mutexattr_t *, int);
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#endif
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void
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scm_init_pthread_threads ()
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{
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pthread_mutexattr_init (&scm_i_plugin_mutex);
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#ifdef SCM_MUTEX_FAST
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pthread_mutexattr_settype (&scm_i_plugin_mutex, SCM_MUTEX_FAST);
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#endif
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#if defined (SCM_MUTEX_RECURSIVE) && !defined (SCM_DEBUG_THREADS)
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if (sizeof (pthread_mutex_t) > SCM_REC_MUTEX_MAXSIZE)
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{
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fprintf (stderr, "Internal error: Need to upgrade mutex size\n");
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abort ();
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}
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pthread_mutexattr_init (&scm_i_plugin_rec_mutex);
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pthread_mutexattr_settype (&scm_i_plugin_rec_mutex, SCM_MUTEX_RECURSIVE);
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#else
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/* If PTHREAD_MUTEX_RECURSIVE is not defined,
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scm_i_plugin_rec_mutex_init won't pay attention to it anyway
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*/
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if (sizeof (rec_mutex) > SCM_REC_MUTEX_MAXSIZE)
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{
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fprintf (stderr, "Internal error: Need to upgrade mutex size\n");
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abort ();
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}
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scm_i_plugin_mutex_init (&rec_mutex_mutex, &scm_i_plugin_mutex);
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#endif
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#ifdef SCM_DEBUG_THREADS
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pthread_mutex_init (&mutex_mutex, &scm_i_plugin_mutex);
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#endif
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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