Remove ancient trunk folder from svn repository

[synfig.git] / ETL / ETL / _mutex_pthreads.h

diff --git a/ETL/ETL/_mutex_pthreads.h b/ETL/ETL/_mutex_pthreads.h
new file mode 100644 (file)
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+++ b/ETL/ETL/_mutex_pthreads.h
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+/*! ========================================================================
+** 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