-/* Copyright (C) 2002 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. */
-
-
-\f
-
-#include "libguile/scmconfig.h"
-
-scm_t_mutexattr scm_i_plugin_mutex;
-
-scm_t_mutexattr scm_i_plugin_rec_mutex;
-
-#if !defined (SCM_MUTEX_RECURSIVE) || defined (SCM_DEBUG_THREADS)
-
-typedef struct rec_mutex {
-#ifdef SCM_DEBUG_THREADS
- int kind;
-#endif
- scm_t_mutex mutex;
- scm_thread *owner;
- int count;
-} rec_mutex;
-
-/* Mutex for recursive mutex administration */
-static scm_t_mutex rec_mutex_mutex;
-
-#ifdef SCM_DEBUG_THREADS
-
-#define FAST_MUTEX 1
-#define REC_MUTEX 2
-
-typedef struct mutex {
-#ifdef SCM_DEBUG_THREADS
- int kind;
-#endif
- pthread_mutex_t mutex;
- scm_thread *owner;
- int count;
-} mutex;
-
-static pthread_mutex_t mutex_mutex;
-
-int
-scm_i_plugin_mutex_init (scm_t_mutex *mx, const scm_t_mutexattr *a)
-{
- mutex *m = (mutex *) mx;
- pthread_mutex_init (&m->mutex, &scm_i_plugin_mutex);
- m->owner = 0;
- m->count = 0;
- m->kind = FAST_MUTEX;
- return 0;
-}
-
-int
-scm_i_plugin_mutex_lock (scm_t_mutex *mx)
-{
- mutex *m = (mutex *) mx;
- scm_thread *t = SCM_CURRENT_THREAD;
- pthread_mutex_lock (&mutex_mutex);
- if (m->kind != FAST_MUTEX)
- {
- fprintf (stderr,
- m->kind == REC_MUTEX
- ? "locking wrong mutex type\n"
- : "locking uninitialized mutex\n");
- abort ();
- }
- if (m->owner == t)
- {
- fprintf (stderr, "locking mutex already locked by self\n");
- abort ();
- }
- pthread_mutex_unlock (&mutex_mutex);
- pthread_mutex_lock (&m->mutex);
- m->count = 1;
- m->owner = t;
- return 0;
-}
-
-int
-scm_i_plugin_mutex_unlock (scm_t_mutex *mx)
-{
- mutex *m = (mutex *) mx;
- pthread_mutex_lock (&mutex_mutex);
- if (m->kind != FAST_MUTEX)
- {
- fprintf (stderr,
- m->kind == REC_MUTEX
- ? "locking wrong mutex type\n"
- : "locking uninitialized mutex\n");
- abort ();
- }
- if (m->count != 1)
- {
- fprintf (stderr,
- m->count == 0
- ? "unlocking unlocked mutex\n"
- : "bogus internal state");
- abort ();
- }
- m->owner = 0;
- m->count = 0;
- pthread_mutex_unlock (&m->mutex);
- pthread_mutex_unlock (&mutex_mutex);
- return 0;
-}
-
-int
-scm_i_plugin_cond_wait (scm_t_cond *c, scm_t_mutex *mx)
-{
- mutex *m = (mutex *) mx;
- return pthread_cond_wait ((pthread_cond_t *) c, m->mutex);
-}
-
-int
-scm_i_plugin_cond_wait (scm_t_cond *c,
- scm_t_mutex *mx,
- const struct timespec *t)
-{
- mutex *m = (mutex *) mx;
- return pthread_cond_timedwait ((pthread_cond_t *) c, m->mutex, t);
-}
-
-#endif
-
-/* The following section belongs in threads.c, or rather
- thread-plugin.c. It is generic and not tied to any particular
- thread library. */
-
-int
-scm_i_plugin_rec_mutex_init (scm_t_rec_mutex *mx, const scm_t_mutexattr *a)
-{
- rec_mutex *m = (rec_mutex *) mx;
- scm_i_plugin_mutex_init (&m->mutex, &scm_i_plugin_mutex);
- m->owner = 0;
- m->count = 0;
-#ifdef SCM_DEBUG_THREADS
- m->kind = REC_MUTEX;
-#endif
- return 0;
-}
-
-int
-scm_i_plugin_rec_mutex_lock (scm_t_rec_mutex *mx)
-{
- rec_mutex *m = (rec_mutex *) mx;
- scm_thread *t = SCM_CURRENT_THREAD;
- scm_i_plugin_mutex_lock (&rec_mutex_mutex);
-#ifdef SCM_DEBUG_THREADS
- if (m->kind != REC_MUTEX)
- {
- fprintf (stderr,
- m->kind == FAST_MUTEX
- ? "locking wrong mutex type\n"
- : "locking uninitialized mutex\n");
- abort ();
- }
-#endif
- if (m->count && m->owner == t)
- {
- ++m->count;
- scm_i_plugin_mutex_unlock (&rec_mutex_mutex);
- }
- else
- {
- scm_i_plugin_mutex_unlock (&rec_mutex_mutex);
- scm_i_plugin_mutex_lock (&m->mutex);
- m->count = 1;
- m->owner = t;
- }
- return 0;
-}
-
-int
-scm_i_plugin_rec_mutex_trylock (scm_t_rec_mutex *mx)
-{
- rec_mutex *m = (rec_mutex *) mx;
- scm_thread *t = SCM_CURRENT_THREAD;
- scm_i_plugin_mutex_lock (&rec_mutex_mutex);
- if (m->owner != 0 && m->owner != t)
- return EBUSY;
- else if (m->count)
- {
- ++m->count;
- scm_i_plugin_mutex_unlock (&rec_mutex_mutex);
- }
- else
- {
- scm_i_plugin_mutex_unlock (&rec_mutex_mutex);
- scm_i_plugin_mutex_lock (&m->mutex);
- m->count = 1;
- m->owner = t;
- }
- return 0;
-}
-
-int
-scm_i_plugin_rec_mutex_unlock (scm_t_rec_mutex *mx)
-{
- rec_mutex *m = (rec_mutex *) mx;
- scm_i_plugin_mutex_lock (&rec_mutex_mutex);
-#ifdef SCM_DEBUG_THREADS
- if (m->kind != REC_MUTEX)
- {
- fprintf (stderr,
- m->kind == FAST_MUTEX
- ? "locking wrong mutex type\n"
- : "locking uninitialized mutex\n");
- abort ();
- }
- if (m->count == 0)
- {
- fprintf (stderr, "unlocking unlocked mutex\n");
- abort ();
- }
-#endif
- if (!--m->count)
- {
- m->owner = 0;
- scm_i_plugin_mutex_unlock (&m->mutex);
- }
- scm_i_plugin_mutex_unlock (&rec_mutex_mutex);
- return 0;
-}
-
-#endif /* !PTHREAD_MUTEX_RECURSIVE */
-
-#ifndef SCM_MUTEXATTR_SETTYPE_DECLARED
-int pthread_mutexattr_settype (pthread_mutexattr_t *, int);
-#endif
-
-void
-scm_init_pthread_threads ()
-{
- pthread_mutexattr_init (&scm_i_plugin_mutex);
-#ifdef SCM_MUTEX_FAST
- pthread_mutexattr_settype (&scm_i_plugin_mutex, SCM_MUTEX_FAST);
-#endif
-
-#if defined (SCM_MUTEX_RECURSIVE) && !defined (SCM_DEBUG_THREADS)
- if (sizeof (pthread_mutex_t) > SCM_REC_MUTEX_MAXSIZE)
- {
- fprintf (stderr, "Internal error: Need to upgrade mutex size\n");
- abort ();
- }
- pthread_mutexattr_init (&scm_i_plugin_rec_mutex);
- pthread_mutexattr_settype (&scm_i_plugin_rec_mutex, SCM_MUTEX_RECURSIVE);
-#else
- /* If PTHREAD_MUTEX_RECURSIVE is not defined,
- scm_i_plugin_rec_mutex_init won't pay attention to it anyway
- */
- if (sizeof (rec_mutex) > SCM_REC_MUTEX_MAXSIZE)
- {
- fprintf (stderr, "Internal error: Need to upgrade mutex size\n");
- abort ();
- }
- scm_i_plugin_mutex_init (&rec_mutex_mutex, &scm_i_plugin_mutex);
-#endif
-#ifdef SCM_DEBUG_THREADS
- pthread_mutex_init (&mutex_mutex, &scm_i_plugin_mutex);
-#endif
-}
-
-/*
- Local Variables:
- c-file-style: "gnu"
- End:
-*/
HCoop / bpt / guile.git / blobdiff