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

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

diff --git a/cinelerra-5.1/guicast/condition.h b/cinelerra-5.1/guicast/condition.h
new file mode 100644 (file)
index 0000000..8ab4fd8
--- /dev/null
+++ b/cinelerra-5.1/guicast/condition.h
@@ -0,0 +1,64 @@
+
+/*
+ * 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 CONDITION_H
+#define CONDITION_H
+
+#include <pthread.h>
+
+class Condition
+{
+public:
+       Condition(int init_value = 0, const char *title = 0, int is_binary = 0);
+       ~Condition();
+
+
+// Reset to init_value whether locked or not.
+       void reset();
+// Block if value <= 0, then decrease value
+       void lock(const char *location = 0);
+// Increase value
+       void unlock();
+// Block for requested duration if value <= 0.
+// value is decreased whether or not the condition is unlocked in time
+// Returns 1 if timeout or 0 if success.
+       int timed_lock(int microseconds, const char *location = 0);
+       int get_value();
+
+    pthread_cond_t cond;
+    pthread_mutex_t mutex;
+    int value;
+       int init_value;
+       int is_binary;
+       const char *title;
+};
+
+class cLock
+{
+       Condition &cond;
+public:
+       cLock(Condition &c) : cond(c) { cond.lock(); }
+       cLock(Condition *c) : cond(*c) { cond.lock(); }
+       ~cLock() { cond.unlock(); }
+};
+
+
+#endif