pthread_mutexattr_getpshared(3) — Linux manual page



NAME         top

       pthread_mutexattr_getpshared,  pthread_mutexattr_setpshared - get/set
       process-shared mutex attribute

SYNOPSIS         top

       #include <pthread.h>

       int pthread_mutexattr_getpshared(const pthread_mutexattr_t *attr,
                                        int *pshared);
       int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,
                                        int pshared);

       Compile and link with -pthread.

DESCRIPTION         top

       These functions get and set the process-shared attribute in a mutex
       attributes object.  This attribute must be appropriately set to
       ensure correct, efficient operation of a mutex created using this
       attributes object.

       The process-shared attribute can have one of the following values:

              Mutexes created with this attributes object are to be shared
              only among threads in the same process that initialized the
              mutex.  This is the default value for the process-shared mutex

              Mutexes created with this attributes object can be shared
              between any threads that have access to the memory containing
              the object, including threads in different processes.

       pthread_mutexattr_getpshared() places the value of the process-shared
       attribute of the mutex attributes object referred to by attr in the
       location pointed to by pshared.

       pthread_mutexattr_setpshared() sets the value of the process-shared
       attribute of the mutex attributes object referred to by attr to the
       value specified in pshared.

       If attr does not refer to an initialized mutex attributes object, the
       behavior is undefined.

RETURN VALUE         top

       On success, these functions return 0.  On error, they return a
       positive error number.

ERRORS         top

       pthread_mutexattr_setpshared() can fail with the following errors:

       EINVAL The value specified in pshared is invalid.

              pshared is PTHREAD_PROCESS_SHARED but the implementation does
              not support process-shared mutexes.

CONFORMING TO         top

       POSIX.1-2001, POSIX.1-2008.

SEE ALSO         top

       pthread_mutexattr_init(3), pthreads(7)

COLOPHON         top

       This page is part of release 5.08 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at

Linux                            2017-09-13  PTHREAD_MUTEXATTR_GETPSHARED(3)

Pages that refer to this page: pthread_mutexattr_destroy(3)pthread_mutexattr_init(3)