[svn-commits] trunk r29727 - in /trunk/include/asterisk: linkedlists.h lock.h

[svn-commits at lists.digium.com]

Author: kpfleming
Date: Tue May 23 12:04:07 2006
New Revision: 29727

URL: http://svn.digium.com/view/asterisk?rev=29727&view=rev
Log:
restore AST_LIST_HEAD_INIT (with no users in the tree right now)
update ast_mutex_init to allow mutexes that are all zero bytes to be initialized (in the case of a dynamically-allocated structure containing a mutex)

Modified:
    trunk/include/asterisk/linkedlists.h
    trunk/include/asterisk/lock.h

Modified: trunk/include/asterisk/linkedlists.h
URL: http://svn.digium.com/view/asterisk/trunk/include/asterisk/linkedlists.h?rev=29727&r1=29726&r2=29727&view=diff
==============================================================================
--- trunk/include/asterisk/linkedlists.h (original)
+++ trunk/include/asterisk/linkedlists.h Tue May 23 12:04:07 2006
@@ -360,6 +360,19 @@
 #define AST_LIST_TRAVERSE_SAFE_END  }
 
 /*!
+  \brief Initializes a list head structure.
+  \param head This is a pointer to the list head structure
+
+  This macro initializes a list head structure by setting the head
+  entry to \a NULL (empty list) and recreating the embedded lock.
+*/
+#define AST_LIST_HEAD_INIT(head) {					\
+	(head)->first = NULL;						\
+	(head)->last = NULL;						\
+	ast_mutex_init(&(head)->lock);					\
+}
+
+/*!
   \brief Destroys a list head structure.
   \param head This is a pointer to the list head structure
 

Modified: trunk/include/asterisk/lock.h
URL: http://svn.digium.com/view/asterisk/trunk/include/asterisk/lock.h?rev=29727&r1=29726&r2=29727&view=diff
==============================================================================
--- trunk/include/asterisk/lock.h (original)
+++ trunk/include/asterisk/lock.h Tue May 23 12:04:07 2006
@@ -149,6 +149,13 @@
 
 typedef pthread_cond_t ast_cond_t;
 
+static pthread_mutex_t empty_mutex;
+
+static void __attribute__((constructor)) init_empty_mutex(void)
+{
+	memset(&empty_mutex, 0, sizeof(empty_mutex));
+}
+
 static inline int __ast_pthread_mutex_init_attr(const char *filename, int lineno, const char *func,
 						const char *mutex_name, ast_mutex_t *t,
 						pthread_mutexattr_t *attr) 
@@ -157,14 +164,16 @@
 	int canlog = strcmp(filename, "logger.c");
 
 	if ((t->mutex) != ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
-		__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is already initialized.\n",
-				   filename, lineno, func, mutex_name);
-		__ast_mutex_logger("%s line %d (%s): Error: previously initialization of mutex '%s'.\n",
-				   t->file[0], t->lineno[0], t->func[0], mutex_name);
-#ifdef THREAD_CRASH
-		DO_THREAD_CRASH;
-#endif
-		return 0;
+		if ((t->mutex) != (empty_mutex)) {
+			__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is already initialized.\n",
+					   filename, lineno, func, mutex_name);
+			__ast_mutex_logger("%s line %d (%s): Error: previously initialization of mutex '%s'.\n",
+					   t->file[0], t->lineno[0], t->func[0], mutex_name);
+#ifdef THREAD_CRASH
+			DO_THREAD_CRASH;
+#endif
+			return 0;
+		}
 	}
 #endif