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PTHREAD_MUTEX_CONSISTENT(3)                                             Linux Programmer's Manual                                            PTHREAD_MUTEX_CONSISTENT(3)

NAME
       pthread_mutex_consistent - make a robust mutex consistent

SYNOPSIS
       #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

DESCRIPTION
       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_mu‐
       tex_lock().

RETURN VALUE
       On success, pthread_mutex_consistent() returns 0.  Otherwise, it returns a positive error number to indicate the error.

ERRORS
       EINVAL The mutex is either not robust or is not in an inconsistent state.

VERSIONS
       pthread_mutex_consistent() was added to glibc in version 2.12.

CONFORMING TO
       POSIX.1-2008.

NOTES
       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_np(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; since glibc 2.34 it has been marked as
       deprecated.

EXAMPLES
       See pthread_mutexattr_setrobust(3).

SEE ALSO
       pthread_mutex_lock(3), pthread_mutexattr_getrobust(3), pthread_mutexattr_init(3), pthread_mutexattr_setrobust(3), pthreads(7)

Linux                                                                          2021-08-27                                                    PTHREAD_MUTEX_CONSISTENT(3)