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(const pthread_mutexattr_t *attr,
13                                        int *pshared);
14       int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,
15                                        int pshared);
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17       Compile and link with -pthread.
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DESCRIPTION

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

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

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

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

66       pthread_mutexattr_init(3), pthreads(7)
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COLOPHON

69       This page is part of release 5.10 of the Linux man-pages project.  A
70       description of the project, information about reporting bugs, and the
71       latest version of this page, can be found at
72       https://www.kernel.org/doc/man-pages/.
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76Linux                             2017-09-13   PTHREAD_MUTEXATTR_GETPSHARED(3)
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