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_mutex_lock().

RETURN VALUE

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

EXAMPLE

       See pthread_mutexattr_setrobust(3).

SEE ALSO

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

COLOPHON

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