pthread_mutex_consistent - make a robust mutex consistent
#include <pthread.h>
int pthread_mutex_consistent(pthread_mutex_t *mutex);
Compile and link with
-pthread.
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
pthread_mutex_consistent():
_POSIX_C_SOURCE >= 200809L
This function makes a robust mutex consistent if it is in an inconsistent state.
A mutex can be left in an inconsistent state if its owner terminates while
holding the mutex, in which case the next owner who acquires the mutex will
succeed and be notified by a return value of
EOWNERDEAD from a call to
pthread_mutex_lock().
On success,
pthread_mutex_consistent() returns 0. Otherwise, it returns a
positive error number to indicate the cause of the error.
- EINVAL
- The mutex is either not robust or is not in an inconsistent state.
pthread_mutex_consistent() was added to glibc in version 2.12.
POSIX.1-2008.
pthread_mutex_consistent() simply informs the implementation that the
state (shared data) guarded by the mutex has been restored to a consistent
state and that normal operations can now be performed with the mutex. It is
the application's responsibility to ensure that the shared data has been
restored to a consistent state before calling
pthread_mutex_consistent().
Before the addition of
pthread_mutex_consistent() to POSIX, glibc defined
the following equivalent nonstandard function if
_GNU_SOURCE was
defined:
int pthread_mutex_consistent(const pthread_mutex_t *mutex);
This GNU-specific API, which first appeared in glibc 2.4, is nowadays obsolete
and should not be used in new programs.
See
pthread_mutexattr_setrobust(3).
pthread_mutexattr_init(3),
pthread_mutex_lock(3),
pthread_mutexattr_getrobust(3),
pthread_mutexattr_setrobust(3),
pthreads(7)