1 files changed, 68 insertions, 0 deletions

diff --git a/src/stable/mutex.h b/src/stable/mutex.h
new file mode 100644
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--- /dev/null
+++ b/src/stable/mutex.h
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+/*
+ * Copyright (C) 2007-2011 Xagasoft, All rights reserved.
+ *
+ * This file is part of the libbu++ library and is released under the
+ * terms of the license contained in the file LICENSE.
+ */
+
+#ifndef BU_MUTEX_H
+#define BU_MUTEX_H
+
+#include <pthread.h>
+
+namespace Bu
+{
+        /**
+         * Simple mutex wrapper.  Currently this doesn't do anything extra for you
+         * except keep all of the functionality together in an OO sorta' way and
+         * keep you from having to worry about cleaning up your mutexes properly,
+         * or initing them.
+         *@ingroup Threading
+         */
+        class Mutex
+        {
+        public:
+                /**
+                 * Create an unlocked mutex.
+                 */
+                Mutex();
+                
+                /**
+                 * Destroy a mutex.  This can only be done when a mutex is unlocked.
+                 * Failure to unlock before destroying a mutex object could cause it to
+                 * wait for the mutex to unlock, the odds of which are usually farily
+                 * low at deconstruction time.
+                 */
+                ~Mutex();
+
+                /**
+                 * Lock the mutex.  This causes all future calls to lock on this
+                 * instance of mutex to block until the first thread that called mutex
+                 * unlocks it.  At that point the next thread that called lock will get
+                 * a chance to go to work.  Because of the nature of a mutex lock it is
+                 * a very bad idea to do any kind of serious or rather time consuming
+                 * computation within a locked section.  This can cause thread-deadlock
+                 * and your program may hang.
+                 */
+                int lock();
+
+                /**
+                 * Unlock the mutex.  This allows the next thread that asked for a lock
+                 * to lock the mutex and continue with execution.
+                 */
+                int unlock();
+
+                /**
+                 * Try to lock the mutex.  This is the option to go with if you cannot
+                 * avoid putting lengthy operations within a locked section.  trylock
+                 * will attempt to lock the mutex, if the mutex is already locked this
+                 * function returns immediately with an error code.
+                 */
+                int trylock();
+
+        protected:
+                pthread_mutex_t mutex;  /**< The internal mutex reference. */
+        };
+}
+
+#endif