--- /dev/null
+/*! ========================================================================
+** Extended Template and Library
+** Mutex Abstraction Class Implementation
+** $Id$
+**
+** Copyright (c) 2002 Robert B. Quattlebaum Jr.
+**
+** This package 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 of
+** the License, or (at your option) any later version.
+**
+** This package 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.
+**
+** === N O T E S ===========================================================
+**
+** This is an internal header file, included by other ETL headers.
+** You should not attempt to use it directly.
+**
+** ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __ETL__MUTEX_PTHREADS_H_
+#define __ETL__MUTEX_PTHREADS_H_
+
+/* === H E A D E R S ======================================================= */
+
+#define __USE_GNU
+
+#include <pthread.h>
+
+#ifdef HAVE_SCHED_H
+# include <sched.h>
+#endif
+
+/* === M A C R O S ========================================================= */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+_ETL_BEGIN_NAMESPACE
+
+class mutex
+{
+ pthread_mutex_t mtx;
+ pthread_t locker;
+ int depth;
+public:
+
+ mutex()
+ {
+ pthread_mutexattr_t attr;
+ pthread_mutexattr_init(&attr);
+ //#ifdef PTHREAD_PRIO_INHERIT
+ //pthread_mutexattr_setprioceiling(&attr,PTHREAD_PRIO_INHERIT);
+ //#endif
+ #ifdef PTHREAD_MUTEX_RECURSIVE
+ pthread_mutexattr_settype(&attr,PTHREAD_MUTEX_RECURSIVE);
+ #endif
+ pthread_mutex_init(&mtx,&attr);
+ pthread_mutexattr_destroy(&attr);
+ locker=0;
+ depth=0;
+ }
+
+ ~mutex()
+ { pthread_mutex_destroy(&mtx); }
+
+
+ //! Exception-safe mutex lock class
+ class lock
+ {
+ mutex *_mtx;
+ public:
+ lock(mutex &x):_mtx(&x) { _mtx->lock_mutex(); }
+ ~lock() { _mtx->unlock_mutex(); }
+ mutex &get() { return *_mtx; }
+ };
+
+ void lock_mutex(void)
+ {
+ if(!locker || locker!=pthread_self())
+ {
+ pthread_mutex_lock(&mtx);
+ locker=pthread_self();
+ depth=0;
+ return;
+ }
+ depth++;
+ }
+
+ bool try_lock_mutex(void)
+ { return !(bool) pthread_mutex_trylock(&mtx); }
+
+ void unlock_mutex(void)
+ {
+ if(depth)
+ {
+ depth--;
+ return;
+ }
+ pthread_mutex_unlock(&mtx);
+ locker=0;
+ }
+};
+
+_ETL_END_NAMESPACE
+
+/* === E X T E R N S ======================================================= */
+
+/* === E N D =============================================================== */
+
+#endif