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From: John Baldwin <jhb@FreeBSD.org>
Date: Fri, 20 Nov 2009 19:21:33 +0000 (UTC)
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Subject: svn commit: r199607 - head/lib/libc/stdtime
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Author: jhb
Date: Fri Nov 20 19:21:33 2009
New Revision: 199607
URL: http://svn.freebsd.org/changeset/base/199607

Log:
  Replace gmt_is_set and the gmt_mutex lock with a pthread_once_t variable and
  an init routine run on the first invocation via _once().
  
  MFC after:	1 week

Modified:
  head/lib/libc/stdtime/localtime.c

Modified: head/lib/libc/stdtime/localtime.c
==============================================================================
--- head/lib/libc/stdtime/localtime.c	Fri Nov 20 19:19:51 2009	(r199606)
+++ head/lib/libc/stdtime/localtime.c	Fri Nov 20 19:21:33 2009	(r199607)
@@ -235,9 +235,8 @@ static struct state	gmtmem;
 
 static char		lcl_TZname[TZ_STRLEN_MAX + 1];
 static int		lcl_is_set;
-static int		gmt_is_set;
+static pthread_once_t	gmt_once = PTHREAD_ONCE_INIT;
 static pthread_rwlock_t	lcl_rwlock = PTHREAD_RWLOCK_INITIALIZER;
-static pthread_mutex_t	gmt_mutex = PTHREAD_MUTEX_INITIALIZER;
 
 char *			tzname[2] = {
 	wildabbr,
@@ -1464,6 +1463,17 @@ struct tm *		tmp;
 	return tmp;
 }
 
+static void
+gmt_init(void)
+{
+
+#ifdef ALL_STATE
+	gmtptr = (struct state *) malloc(sizeof *gmtptr);
+	if (gmtptr != NULL)
+#endif /* defined ALL_STATE */
+		gmtload(gmtptr);
+}
+
 /*
 ** gmtsub is to gmtime as localsub is to localtime.
 */
@@ -1476,16 +1486,7 @@ struct tm * const	tmp;
 {
 	register struct tm *	result;
 
-	_MUTEX_LOCK(&gmt_mutex);
-	if (!gmt_is_set) {
-#ifdef ALL_STATE
-		gmtptr = (struct state *) malloc(sizeof *gmtptr);
-		if (gmtptr != NULL)
-#endif /* defined ALL_STATE */
-			gmtload(gmtptr);
-		gmt_is_set = TRUE;
-	}
-	_MUTEX_UNLOCK(&gmt_mutex);
+	_once(&gmt_once, gmt_init);
 	result = timesub(timep, offset, gmtptr, tmp);
 #ifdef TM_ZONE
 	/*