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authorMikael Djurfeldt <djurfeldt@nada.kth.se>2002-12-16 09:28:38 +0000
committerMikael Djurfeldt <djurfeldt@nada.kth.se>2002-12-16 09:28:38 +0000
commit93cd4dcd9c37f3ee1401742dcc81ec192209b5ff (patch)
tree7f01ce64b2b3bcd4bef27559777c39f39f115f5f /libguile/pthread-threads.c
parent09841c77838b6263c666036f1e81c82cbe8e152e (diff)
downloadguile-93cd4dcd9c37f3ee1401742dcc81ec192209b5ff.tar.gz
* pthread-threads.c, pthread-threads.h, threads.c: Fixes to
pthread "native" recursive mutex support.
Diffstat (limited to 'libguile/pthread-threads.c')
-rw-r--r--libguile/pthread-threads.c165
1 files changed, 165 insertions, 0 deletions
diff --git a/libguile/pthread-threads.c b/libguile/pthread-threads.c
new file mode 100644
index 000000000..cfb5ed5e7
--- /dev/null
+++ b/libguile/pthread-threads.c
@@ -0,0 +1,165 @@
+/* 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. */
+
+
+
+
+#include "libguile/scmconfig.h"
+
+scm_t_mutexattr scm_i_plugin_mutex;
+
+scm_t_mutexattr scm_i_plugin_rec_mutex;
+
+#ifndef SCM_MUTEX_RECURSIVE
+#error hej
+typedef struct rec_mutex {
+ scm_t_mutex mutex;
+ scm_thread *owner;
+ int count;
+} rec_mutex;
+
+/* Mutex for recursive mutex administration */
+static scm_t_mutex rec_mutex_mutex;
+
+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;
+ 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);
+ 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);
+ 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 ()
+{
+ if (sizeof (scm_t_rec_mutex) > SCM_REC_MUTEX_MAXSIZE)
+ {
+ fprintf (stderr, "Internal error: Need to upgrade mutex size\n");
+ abort ();
+ }
+
+ pthread_mutexattr_init (&scm_i_plugin_mutex);
+#ifdef SCM_MUTEX_FAST
+ pthread_mutexattr_settype (&scm_i_plugin_mutex, SCM_MUTEX_FAST);
+#endif
+
+#ifdef SCM_MUTEX_RECURSIVE /* Use the POSIX 1003.1c identifier */
+ 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
+ */
+ scm_i_plugin_mutex_init (&rec_mutex_mutex, &scm_i_plugin_mutex);
+#endif
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/