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posix: Fix mutex auto initialization

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Use the once lock to prevent race conditions during auto initialization.
This commit is contained in:
Sebastian Huber
2014-10-08 11:26:27 +02:00
parent 419accf6a6
commit dfdad6ab1d
1 changed files with 10 additions and 1 deletions
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cpukit/posix/src/mutexget.c
+10 -1
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@@ -19,6 +19,7 @@
#endif
#include <rtems/posix/muteximpl.h>
#include <rtems/score/apimutex.h>
static bool _POSIX_Mutex_Check_id_and_auto_init(
pthread_mutex_t *mutex,
@@ -34,7 +35,15 @@ static bool _POSIX_Mutex_Check_id_and_auto_init(
if ( *mutex == PTHREAD_MUTEX_INITIALIZER ) {
int eno;
eno = pthread_mutex_init( mutex, NULL );
_Once_Lock();
if ( *mutex == PTHREAD_MUTEX_INITIALIZER ) {
eno = pthread_mutex_init( mutex, NULL );
} else {
eno = 0;
}
_Once_Unlock();
if ( eno != 0 ) {
*location = OBJECTS_ERROR;