Merge CV, ver=5.1; ops/methods from HV, and interface from CV where possible

[goodguy/history.git] / cinelerra-5.1 / guicast / mutex.h

diff --git a/cinelerra-5.1/guicast/mutex.h b/cinelerra-5.1/guicast/mutex.h
new file mode 100644 (file)
index 0000000..f510f0d
--- /dev/null
+++ b/cinelerra-5.1/guicast/mutex.h
@@ -0,0 +1,65 @@
+
+/*
+ * CINELERRA
+ * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
+ * 
+ * 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 of the License, 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 program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ */
+
+#ifndef MUTEX_H
+#define MUTEX_H
+
+#include <pthread.h>
+#include <stdio.h>
+
+class Mutex
+{
+public:
+       Mutex(const char *title = 0, int recursive = 0);
+       ~Mutex();
+
+       int lock(const char *location = 0);
+       int unlock();
+// Calls pthread_mutex_trylock, whose effect depends on library version.
+       int trylock(const char *location = 0);
+       int reset();
+// Returns 1 if count is > 0
+       int is_locked();
+
+// Number of times the thread currently holding the mutex has locked it.
+// For recursive locking.
+       int count;
+// ID of the thread currently holding the mutex.  For recursive locking.
+       pthread_t thread_id;
+       int thread_id_valid;
+       int recursive;
+// Lock the variables for recursive locking.
+       pthread_mutex_t recursive_lock;
+       pthread_mutex_t mutex;
+       const char *title;
+};
+
+class mLock
+{
+       Mutex &mutex;
+public:
+       mLock(Mutex &m) : mutex(m) { mutex.lock(); }
+       mLock(Mutex *m) : mutex(*m) { mutex.lock(); }
+       ~mLock() { mutex.unlock(); }
+};
+
+
+#endif