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diff --git a/cinelerra-5.1/guicast/mutex.C b/cinelerra-5.1/guicast/mutex.C
new file mode 100644
index 00000000..a4a6e21f
--- /dev/null
+++ b/cinelerra-5.1/guicast/mutex.C
@@ -0,0 +1,169 @@
+
+/*
+ * 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
+ *
+ */
+
+#include <stdio.h>
+#include <errno.h>
+
+#ifndef NO_GUICAST
+#include "bcsignals.h"
+#endif
+#include "mutex.h"
+
+
+Mutex::Mutex(const char *title, int recursive)
+{
+	this->title = title;
+	pthread_mutexattr_t attr;
+	pthread_mutexattr_init(&attr);
+	pthread_mutex_init(&mutex, &attr);
+	pthread_mutex_init(&recursive_lock, &attr);
+	count = 0;
+	this->recursive = recursive;
+	thread_id = 0;
+	thread_id_valid = 0;
+}
+
+Mutex::~Mutex()
+{
+	pthread_mutex_destroy(&mutex);
+	pthread_mutex_destroy(&recursive_lock);
+#ifndef NO_GUICAST
+	UNSET_ALL_LOCKS(this);
+#endif
+}
+
+int Mutex::lock(const char *location)
+{
+// Test recursive owner and give up if we already own it
+	if(recursive)
+	{
+		pthread_mutex_lock(&recursive_lock);
+		if(thread_id_valid && pthread_self() == thread_id)
+		{
+			count++;
+			pthread_mutex_unlock(&recursive_lock);
+			return 0;
+		}
+		pthread_mutex_unlock(&recursive_lock);
+	}
+
+
+#ifndef NO_GUICAST
+	SET_LOCK(this, title, location);
+#endif
+	if(pthread_mutex_lock(&mutex)) perror("Mutex::lock");
+
+
+
+// Update recursive status for the first lock
+	if(recursive)
+	{
+		pthread_mutex_lock(&recursive_lock);
+		count = 1;
+		thread_id = pthread_self();
+		thread_id_valid = 1;
+		pthread_mutex_unlock(&recursive_lock);
+	}
+	else
+	{
+		count = 1;
+	}
+
+
+#ifndef NO_GUICAST
+	SET_LOCK2
+#endif
+	return 0;
+}
+
+int Mutex::unlock()
+{
+// Remove from recursive status
+	if(recursive)
+	{
+		pthread_mutex_lock(&recursive_lock);
+		count--;
+// Still locked
+		if(count > 0)
+		{
+			pthread_mutex_unlock(&recursive_lock);
+			return 0;
+		}
+// Not owned anymore
+		thread_id = 0;
+		thread_id_valid = 0;
+		pthread_mutex_unlock(&recursive_lock);
+	}
+	else
+		count = 0;
+
+
+#ifndef NO_GUICAST
+	UNSET_LOCK(this);
+#endif
+
+	if(pthread_mutex_unlock(&mutex)) perror("Mutex::unlock");
+	return 0;
+}
+
+int Mutex::trylock(const char *location)
+{
+	if( count ) return EBUSY;
+	int ret = pthread_mutex_trylock(&mutex);
+	if( ret ) return ret;
+
+// Update recursive status for the first lock
+	if(recursive) {
+		pthread_mutex_lock(&recursive_lock);
+		count = 1;
+		thread_id = pthread_self();
+		thread_id_valid = 1;
+		pthread_mutex_unlock(&recursive_lock);
+	}
+	else
+		count = 1;
+
+#ifndef NO_GUICAST
+	SET_LOCK(this, title, location);
+	SET_LOCK2
+#endif
+	return 0;
+}
+
+int Mutex::is_locked()
+{
+	return count;
+}
+
+int Mutex::reset()
+{
+	pthread_mutex_destroy(&mutex);
+	pthread_mutexattr_t attr;
+	pthread_mutexattr_init(&attr);
+	pthread_mutex_init(&mutex, &attr);
+	count = 0;
+	thread_id = 0;
+	thread_id_valid = 0;
+#ifndef NO_GUICAST
+	UNSET_ALL_LOCKS(this)
+#endif
+	return 0;
+}