diff options
Diffstat (limited to 'libguile/threads-plugin.c')
-rw-r--r-- | libguile/threads-plugin.c | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/libguile/threads-plugin.c b/libguile/threads-plugin.c index 7d7cab141..e69de29bb 100644 --- a/libguile/threads-plugin.c +++ b/libguile/threads-plugin.c @@ -1,210 +0,0 @@ -/* 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. */ - - - - -#if HAVE_CONFIG_H -# include <config.h> -#endif - -int scm_i_plugin_mutex_size = 0; -int (*scm_i_plugin_mutex_init) (scm_t_mutex *, const scm_t_mutexattr *); -int (*scm_i_plugin_mutex_lock) (scm_t_mutex *); -int (*scm_i_plugin_mutex_unlock) (scm_t_mutex *); - -int scm_i_plugin_rec_mutex_size = 0; -int (*scm_i_plugin_rec_mutex_init) (scm_t_rec_mutex *, - const scm_t_mutexattr *); -int (*scm_i_plugin_rec_mutex_destroy) (scm_t_rec_mutex *); -int (*scm_i_plugin_rec_mutex_lock) (scm_t_rec_mutex *); -int (*scm_i_plugin_rec_mutex_trylock) (scm_t_rec_mutex *); -int (*scm_i_plugin_rec_mutex_unlock) (scm_t_rec_mutex *); - -int (*scm_i_plugin_cond_wait) (scm_t_cond *, scm_t_mutex *); -int (*scm_i_plugin_cond_timedwait) (scm_t_cond *, - scm_t_mutex *, - const scm_t_timespec *); - -#ifdef SCM_DEBUG_THREADS -#define FAST_MUTEX 1 -#define REC_MUTEX 2 -#endif - -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; - -static int -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; -} - -static int -rec_mutex_destroy (scm_t_rec_mutex *mx) -{ - rec_mutex *m = (rec_mutex *) mx; - return scm_i_plugin_mutex_destroy (&m->mutex); -} - -static int -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; -} - -static int -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; -} - -static int -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; -} - -#ifndef SCM_MUTEXATTR_SETTYPE_DECLARED -int pthread_mutexattr_settype (pthread_mutexattr_t *, int); -#endif - -void -scm_init_threads_plugin () -{ - if (scm_i_plugin_rec_mutex_size == 0) - { - scm_i_plugin_rec_mutex_size = sizeof (rec_mutex); - scm_i_plugin_mutex_init (&rec_mutex_mutex, &scm_i_plugin_mutex); - scm_i_plugin_rec_mutex_init = rec_mutex_init; - scm_i_plugin_rec_mutex_destroy = rec_mutex_destroy; - scm_i_plugin_rec_mutex_lock = rec_mutex_lock; - scm_i_plugin_rec_mutex_trylock = rec_mutex_trylock; - scm_i_plugin_rec_mutex_unlock = rec_mutex_unlock; - } - if (scm_i_plugin_mutex_size > SCM_MUTEX_MAXSIZE - || scm_i_plugin_rec_mutex_size > SCM_REC_MUTEX_MAXSIZE) - { - fprintf (stderr, "Internal error: Need to upgrade mutex size\n"); - abort (); - } -} |