Merged revisions 190092 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r190092 | tilghman | 2009-04-22 16:35:03 -0500 (Wed, 22 Apr 2009) | 7 lines
  
  Detect availability of pthread_rwlock_timedwrlock() before using it.
  (closes issue #14930)
   Reported by: tilghman
   Patches: 
         20090420__bug14930.diff.txt uploaded by tilghman (license 14)
   Tested by: mvanbaak, tilghman
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@190093 65c4cc65-6c06-0410-ace0-fbb531ad65f3

2 files changed, 76 insertions, 2 deletions

diff --git a/include/asterisk/autoconfig.h.in b/include/asterisk/autoconfig.h.in
index 50ef2fa50..57987139f 100644
--- a/include/asterisk/autoconfig.h.in
+++ b/include/asterisk/autoconfig.h.in
@@ -716,6 +716,9 @@
    pthread.h */
 #undef HAVE_PTHREAD_RWLOCK_PREFER_WRITER_NP
 
+/* Define if your system has pthread_rwlock_timedwrlock() */
+#undef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
+
 /* Define to 1 if the system has the type `ptrdiff_t'. */
 #undef HAVE_PTRDIFF_T
 
diff --git a/include/asterisk/lock.h b/include/asterisk/lock.h
index bba20c85d..1bd300e40 100644
--- a/include/asterisk/lock.h
+++ b/include/asterisk/lock.h
@@ -49,10 +49,15 @@
 #define _ASTERISK_LOCK_H
 
 #include <pthread.h>
+#include <time.h>
 #include <sys/param.h>
 #ifdef HAVE_BKTR
 #include <execinfo.h>
 #endif
+
+#ifndef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
+#include "asterisk/time.h"
+#endif
 #include "asterisk/logger.h"
 
 /* internal macro to profile mutexes. Only computes the delay on
@@ -1395,7 +1400,23 @@ static inline int _ast_rwlock_timedrdlock(ast_rwlock_t *t, const char *name,
 		ast_store_lock_info(AST_WRLOCK, filename, line, func, name, t);
 #endif
 	}
+#ifdef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
 	res = pthread_rwlock_timedrdlock(&t->lock, abs_timeout);
+#else
+	do {
+		struct timeval _start = ast_tvnow(), _diff;
+		for (;;) {
+			if (!(res = pthread_rwlock_tryrdlock(&t->lock))) {
+				break;
+			}
+			_diff = ast_tvsub(ast_tvnow(), _start);
+			if (_diff.tv_sec > abs_timeout->tv_sec || (_diff.tv_sec == abs_timeout->tv_sec && _diff.tv_usec * 1000 > abs_timeout->tv_nsec)) {
+				break;
+			}
+			usleep(1);
+		}
+	} while (0);
+#endif
 	if (!res) {
 		ast_reentrancy_lock(lt);
 		if (lt->reentrancy < AST_MAX_REENTRANCY) {
@@ -1474,7 +1495,23 @@ static inline int _ast_rwlock_timedwrlock(ast_rwlock_t *t, const char *name,
 		ast_store_lock_info(AST_WRLOCK, filename, line, func, name, t);
 #endif
 	}
+#ifdef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
 	res = pthread_rwlock_timedwrlock(&t->lock, abs_timeout);
+#else
+	do {
+		struct timeval _start = ast_tvnow(), _diff;
+		for (;;) {
+			if (!(res = pthread_rwlock_trywrlock(&t->lock))) {
+				break;
+			}
+			_diff = ast_tvsub(ast_tvnow(), _start);
+			if (_diff.tv_sec > abs_timeout->tv_sec || (_diff.tv_sec == abs_timeout->tv_sec && _diff.tv_usec * 1000 > abs_timeout->tv_nsec)) {
+				break;
+			}
+			usleep(1);
+		}
+	} while (0);
+#endif
 	if (!res) {
 		ast_reentrancy_lock(lt);
 		if (lt->reentrancy < AST_MAX_REENTRANCY) {
@@ -1762,7 +1799,23 @@ static inline int ast_rwlock_rdlock(ast_rwlock_t *prwlock)
 
 static inline int ast_rwlock_timedrdlock(ast_rwlock_t *prwlock, const struct timespec *abs_timeout)
 {
-	return pthread_rwlock_timedrdlock(prwlock, abs_timeout);
+	int res;
+#ifdef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
+	res = pthread_rwlock_timedrdlock(prwlock, abs_timeout);
+#else
+	struct timeval _start = ast_tvnow(), _diff;
+	for (;;) {
+		if (!(res = pthread_rwlock_tryrdlock(prwlock))) {
+			break;
+		}
+		_diff = ast_tvsub(ast_tvnow(), _start);
+		if (_diff.tv_sec > abs_timeout->tv_sec || (_diff.tv_sec == abs_timeout->tv_sec && _diff.tv_usec * 1000 > abs_timeout->tv_nsec)) {
+			break;
+		}
+		usleep(1);
+	}
+#endif
+	return res;
 }
 
 static inline int ast_rwlock_tryrdlock(ast_rwlock_t *prwlock)
@@ -1777,7 +1830,25 @@ static inline int ast_rwlock_wrlock(ast_rwlock_t *prwlock)
 
 static inline int ast_rwlock_timedwrlock(ast_rwlock_t *prwlock, const struct timespec *abs_timeout)
 {
-	return pthread_rwlock_timedwrlock(prwlock, abs_timeout);
+	int res;
+#ifdef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
+	res = pthread_rwlock_timedwrlock(prwlock, abs_timeout);
+#else
+	do {
+		struct timeval _start = ast_tvnow(), _diff;
+		for (;;) {
+			if (!(res = pthread_rwlock_trywrlock(prwlock))) {
+				break;
+			}
+			_diff = ast_tvsub(ast_tvnow(), _start);
+			if (_diff.tv_sec > abs_timeout->tv_sec || (_diff.tv_sec == abs_timeout->tv_sec && _diff.tv_usec * 1000 > abs_timeout->tv_nsec)) {
+				break;
+			}
+			usleep(1);
+		}
+	} while (0);
+#endif
+	return res;
 }
 
 static inline int ast_rwlock_trywrlock(ast_rwlock_t *prwlock)