1PTHREAD_MUTEXATTR_GETPSHAREDL(i3n)ux Programmer's MaPnTuHaRlEAD_MUTEXATTR_GETPSHARED(3)
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NAME

6       pthread_mutexattr_getpshared,  pthread_mutexattr_setpshared  -  get/set
7       process-shared mutex attribute
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SYNOPSIS

10       #include <pthread.h>
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12       int pthread_mutexattr_getpshared(
13                             const pthread_mutexattr_t *restrict attr,
14                             int *restrict pshared);
15       int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,
16                             int pshared);
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18       Compile and link with -pthread.
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DESCRIPTION

21       These functions get and set the process-shared attribute in a mutex at‐
22       tributes  object.   This  attribute must be appropriately set to ensure
23       correct, efficient operation of a mutex created using  this  attributes
24       object.
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26       The process-shared attribute can have one of the following values:
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28       PTHREAD_PROCESS_PRIVATE
29              Mutexes  created  with  this  attributes object are to be shared
30              only among threads in the same process that initialized the  mu‐
31              tex.  This is the default value for the process-shared mutex at‐
32              tribute.
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34       PTHREAD_PROCESS_SHARED
35              Mutexes created with this attributes object can  be  shared  be‐
36              tween  any threads that have access to the memory containing the
37              object, including threads in different processes.
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39       pthread_mutexattr_getpshared() places the value of  the  process-shared
40       attribute of the mutex attributes object referred to by attr in the lo‐
41       cation pointed to by pshared.
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43       pthread_mutexattr_setpshared() sets the value of the process-shared at‐
44       tribute of the mutex attributes object referred to by attr to the value
45       specified in pshared.
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47       If attr does not refer to an initialized mutex attributes  object,  the
48       behavior is undefined.
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RETURN VALUE

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

55       pthread_mutexattr_setpshared() can fail with the following errors:
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57       EINVAL The value specified in pshared is invalid.
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59       ENOTSUP
60              pshared is PTHREAD_PROCESS_SHARED but  the  implementation  does
61              not support process-shared mutexes.
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CONFORMING TO

64       POSIX.1-2001, POSIX.1-2008.
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SEE ALSO

67       pthread_mutexattr_init(3), pthreads(7)
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COLOPHON

70       This page is part of release 5.12 of the Linux man-pages project.  A
71       description of the project, information about reporting bugs, and the
72       latest version of this page, can be found at
73       https://www.kernel.org/doc/man-pages/.
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77Linux                             2021-03-22   PTHREAD_MUTEXATTR_GETPSHARED(3)
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