From 7134f4b13a4c4b8b68dd16aec4dfa56ba28ef7d7 Mon Sep 17 00:00:00 2001
From: phintuka <phintuka>
Date: Tue, 19 Dec 2006 17:21:50 +0000
Subject: Initial import

---
 tools/debug_mutex.h | 137 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 tools/debug_mutex.h

diff --git a/tools/debug_mutex.h b/tools/debug_mutex.h
new file mode 100644
index 00000000..dc25ec7e
--- /dev/null
+++ b/tools/debug_mutex.h
@@ -0,0 +1,137 @@
+/*
+ * debug_mutex.h: debugging wrappers for pthread_mutex_ functions
+ *
+ * See the main source file 'xineliboutput.c' for copyright information and
+ * how to reach the author.
+ *
+ * $Id: debug_mutex.h,v 1.1 2006-12-19 17:21:50 phintuka Exp $
+ *
+ */
+
+#ifndef DEBUG_MUTEX_H
+#define DEBUG_MUTEX_H
+
+#ifndef _PTHREAD_H
+#  error pthread.h must be included before debug_mutex.h
+#endif
+
+static struct {
+  pthread_mutex_t *lock;
+  int line;
+} dbgdata[64] = {{NULL,0}};
+
+static void dbg_setdata(pthread_mutex_t *mutex, int line)
+{
+  int i;
+  for(i=0; i<32; i++)
+    if(dbgdata[i].lock == mutex) {
+      dbgdata[i].line = line;
+      return;
+    }
+    else if(!dbgdata[i].lock) {
+      dbgdata[i].lock = mutex;
+      dbgdata[i].line = line;
+      return;
+    }
+
+  LOGMSG("********** dbg_setdata: table full !");
+}
+
+static int dbg_getdata(pthread_mutex_t *mutex, int line)
+{
+  int i;
+  for(i=0; i<32; i++)
+    if(dbgdata[i].lock == mutex)
+      return dbgdata[i].line;
+
+  LOGMSG("********** dbg_getdata: NO ENTRY ! (%d)", line);
+  return -1;
+}
+
+static int dbg_init(pthread_mutex_t *mutex, pthread_mutexattr_t *pattr, int line)
+{
+  int r;
+
+  if(!pattr) {
+    pthread_mutexattr_t attr;
+    pthread_mutexattr_init(&attr);
+    pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK_NP);
+    r = pthread_mutex_init(mutex, &attr);
+  } else {
+    LOGMSG("********** dbg_init: mutex attribute already given !");
+    r = pthread_mutex_init(mutex, pattr);
+  }
+
+  if(r) 
+    LOGERR("********** dbg_init: pthread_mutex_init FAILED at %d", line);
+
+  dbg_setdata(mutex, line);
+
+  return r;
+}
+
+static int dbg_free(pthread_mutex_t *mutex, int line)
+{
+  int r;
+
+  r = pthread_mutex_destroy(mutex);
+
+  if(r) 
+    LOGERR("********** dbg_free: pthread_mutex_destroy FAILED at %d ; last lock at %d", 
+	   line, dbg_getdata(mutex, line));
+
+  return r;
+}
+
+static int dbg_lock(pthread_mutex_t *mutex, int line)
+{
+  int r;
+  /*struct timespec abs_timeout;*/
+
+  /* try lock first to reduce logging */
+  r = pthread_mutex_trylock(mutex);
+  if(!r) {
+    dbg_setdata(mutex,line);
+    return r;
+  }
+
+  /* try failed - we're going to wait, so log at wait start and end to detect deadlocks */
+  LOGMSG("********** dbg_lock: pthread_mutex_trylock failed at %d (locked at %d)", 
+	 line, dbg_getdata(mutex, line));
+
+  /*  int pthread_mutex_timedlock(pthread_mutex_t *restrict mutex,
+      const struct timespec *restrict abs_timeout); */
+
+  r = pthread_mutex_lock(mutex);
+
+  if(r) 
+    LOGERR("********** dbg_lock: pthread_mutex_lock FAILED at %d", line);
+  
+  dbg_setdata(mutex, line);
+  LOGMSG("********** dbg_lock: pthread_mutex_lock done at %d", line);
+  
+ return r;
+}
+
+static int dbg_unlock(pthread_mutex_t *mutex, int line)
+{
+  int r;
+
+  r = pthread_mutex_unlock(mutex);
+
+  if(r) 
+    LOGERR("********** dbg_unlock: pthread_mutex_unlock FAILED at %d (last locket at %d)", 
+	   line, dbg_getdata(mutex, line));
+
+  return r;
+}
+
+/* override pthread_ functions with own ones */
+#define pthread_mutex_init(l,a)  dbg_init(l, a, __LINE__)
+#define pthread_mutex_lock(l)    dbg_lock(l, __LINE__)
+#define pthread_mutex_unlock(l)  dbg_unlock(l, __LINE__)
+#define pthread_mutex_destroy(l) dbg_free(l, __LINE__)
+
+#else
+#  error debug_mutex.h included twice
+#endif /* DEBUG_MUTEX_H */
-- 
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