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c11/threads: create mutexattrs only when needed

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If the mutexattrs are the default one can just pass NULL to
pthread_mutex_init. As the compiler does not know this detail it
unnecessarily creates/destroys the attrs.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
This commit is contained in:
Emil Velikov 2016-04-24 16:14:04 +01:00 • committed by Emil Velikov
parent 4424bf5da4
commit 6ce11e7e2c
1 changed files with 7 additions and 2 deletions
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9
include/c11/threads_posix.h
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@ -180,9 +180,14 @@ mtx_init(mtx_t *mtx, int type)
&& type != (mtx_timed|mtx_recursive)
&& type != (mtx_try|mtx_recursive))
return thrd_error;
if ((type & mtx_recursive) == 0) {
pthread_mutex_init(mtx, NULL);
return thrd_success;
}
pthread_mutexattr_init(&attr);
if ((type & mtx_recursive) != 0)
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(mtx, &attr);
pthread_mutexattr_destroy(&attr);
return thrd_success;