1PTHREAD_MUTEXATTR_GETPSHAREDP(O3SPI)X Programmer's MPaTnHuRaElAD_MUTEXATTR_GETPSHARED(3P)
2
6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
10
13 pthread_mutexattr_getpshared, pthread_mutexattr_setpshared — get and
14 set the process-shared attribute
15
17 #include <pthread.h>
18 int pthread_mutexattr_getpshared(const pthread_mutexattr_t
20 *restrict attr, int *restrict pshared);
21 int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,
22 int pshared);
23
25 The pthread_mutexattr_getpshared() function shall obtain the value of
26 the process-shared attribute from the attributes object referenced by
27 attr.
28 The pthread_mutexattr_setpshared() function shall set the process-
30 shared attribute in an initialized attributes object referenced by
31 attr.
32 The process-shared attribute is set to PTHREAD_PROCESS_SHARED to permit
34 a mutex to be operated upon by any thread that has access to the memory
35 where the mutex is allocated, even if the mutex is allocated in memory
36 that is shared by multiple processes. If the process-shared attribute
37 is PTHREAD_PROCESS_PRIVATE, the mutex shall only be operated upon by
38 threads created within the same process as the thread that initialized
39 the mutex; if threads of differing processes attempt to operate on such
40 a mutex, the behavior is undefined. The default value of the attribute
41 shall be PTHREAD_PROCESS_PRIVATE.
42 The behavior is undefined if the value specified by the attr argument
44 to pthread_mutexattr_getpshared() or pthread_mutexattr_setpshared()
45 does not refer to an initialized mutex attributes object.
46
48 Upon successful completion, pthread_mutexattr_setpshared() shall return
49 zero; otherwise, an error number shall be returned to indicate the
50 error.
51 Upon successful completion, pthread_mutexattr_getpshared() shall return
53 zero and store the value of the process-shared attribute of attr into
54 the object referenced by the pshared parameter. Otherwise, an error
55 number shall be returned to indicate the error.
56
58 The pthread_mutexattr_setpshared() function may fail if:
59 EINVAL The new value specified for the attribute is outside the range
61 of legal values for that attribute.
62 These functions shall not return an error code of [EINTR].
64 The following sections are informative.
66
68 None.
69
71 None.
72
74 If an implementation detects that the value specified by the attr argu‐
75 ment to pthread_mutexattr_getpshared() or pthread_mutexattr_setp‐
76 shared() does not refer to an initialized mutex attributes object, it
77 is recommended that the function should fail and report an [EINVAL]
78 error.
79
81 None.
82
84 pthread_cond_destroy(), pthread_create(), pthread_mutex_destroy(),
85 pthread_mutexattr_destroy()
86 The Base Definitions volume of POSIX.1‐2008, <pthread.h>
88
90 Portions of this text are reprinted and reproduced in electronic form
91 from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
92 -- Portable Operating System Interface (POSIX), The Open Group Base
93 Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
94 cal and Electronics Engineers, Inc and The Open Group. (This is
95 POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
96 event of any discrepancy between this version and the original IEEE and
97 The Open Group Standard, the original IEEE and The Open Group Standard
98 is the referee document. The original Standard can be obtained online
99 at http://www.unix.org/online.html .
100 Any typographical or formatting errors that appear in this page are
102 most likely to have been introduced during the conversion of the source
103 files to man page format. To report such errors, see https://www.ker‐
104 nel.org/doc/man-pages/reporting_bugs.html .
105IEEE/The Open Group 2013 PTHREAD_MUTEXATTR_GETPSHARED(3P)