[LTP] [PATCH 4/4] pthread_mutex_trylock/4-3: allow pthread_mutex_trylock return EDEADLK

[Wanlong G. <gao...@cn...>]

POSIX said: (Sure it is unclear)
The pthread_mutex_lock() function shall fail if:

[EDEADLK]
    The mutex type is PTHREAD_MUTEX_ERRORCHECK and the current thread already owns the mutex.

The pthread_mutex_trylock() function shall fail if:

[EBUSY]
    The mutex could not be acquired because it was already locked.

So we should allow pthread_mutex_trylock return EDEADLK or EBUSY
when the mutex is already owned.

Signed-off-by: Wanlong Gao <gao...@cn...>
---
 .../conformance/interfaces/pthread_mutex_trylock/4-3.c                 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/testcases/open_posix_testsuite/conformance/interfaces/pthread_mutex_trylock/4-3.c b/testcases/open_posix_testsuite/conformance/interfaces/pthread_mutex_trylock/4-3.c
index 64c549d..8e75239 100644
--- a/testcases/open_posix_testsuite/conformance/interfaces/pthread_mutex_trylock/4-3.c
+++ b/testcases/open_posix_testsuite/conformance/interfaces/pthread_mutex_trylock/4-3.c
@@ -274,7 +274,8 @@ void *test(void *arg)
 			}
 			ret = EBUSY;
 		}
-		if (ret != EBUSY) {
+
+		if (ret != EBUSY && ret != EDEADLK) {
 			UNRESOLVED(ret, "Unexpected error was returned.");
 		}
 
-- 
1.8.3.2.634.g7a3187e