1PTHREAD_RWLOCKATTR_GETPSHAREPDO(S3IPX)Programmer'sPMTaHnRuEaAlD_RWLOCKATTR_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
12 pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared - get and
13 set the process-shared attribute of the read-write lock attributes
14 object
15
17 #include <pthread.h>
18 int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *
20 restrict attr, int *restrict pshared);
21 int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr,
22 int pshared);
23
26 The pthread_rwlockattr_getpshared() function shall obtain the value of
27 the process-shared attribute from the initialized attributes object
28 referenced by attr. The pthread_rwlockattr_setpshared() function shall
29 set the process-shared attribute in an initialized attributes object
30 referenced by attr.
31 The process-shared attribute shall be set to PTHREAD_PROCESS_SHARED to
33 permit a read-write lock to be operated upon by any thread that has
34 access to the memory where the read-write lock is allocated, even if
35 the read-write lock is allocated in memory that is shared by multiple
36 processes. If the process-shared attribute is PTHREAD_PROCESS_PRIVATE,
37 the read-write lock shall only be operated upon by threads created
38 within the same process as the thread that initialized the read-write
39 lock; if threads of differing processes attempt to operate on such a
40 read-write lock, the behavior is undefined. The default value of the
41 process-shared attribute shall be PTHREAD_PROCESS_PRIVATE.
42 Additional attributes, their default values, and the names of the asso‐
44 ciated functions to get and set those attribute values are implementa‐
45 tion-defined.
46
48 Upon successful completion, the pthread_rwlockattr_getpshared() func‐
49 tion shall return zero and store the value of the process-shared
50 attribute of attr into the object referenced by the pshared parameter.
51 Otherwise, an error number shall be returned to indicate the error.
52 If successful, the pthread_rwlockattr_setpshared() function shall
54 return zero; otherwise, an error number shall be returned to indicate
55 the error.
56
58 The pthread_rwlockattr_getpshared() and pthread_rwlockattr_setpshared()
59 functions may fail if:
60 EINVAL The value specified by attr is invalid.
62 The pthread_rwlockattr_setpshared() function may fail if:
65 EINVAL The new value specified for the attribute is outside the range
67 of legal values for that attribute.
68 These functions shall not return an error code of [EINTR].
71 The following sections are informative.
73
75 None.
76
78 None.
79
81 None.
82
84 None.
85
87 pthread_rwlock_destroy(), pthread_rwlockattr_destroy(), pthread_rwlock‐
88 attr_init(), the Base Definitions volume of IEEE Std 1003.1-2001,
89 <pthread.h>
90
92 Portions of this text are reprinted and reproduced in electronic form
93 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
94 -- Portable Operating System Interface (POSIX), The Open Group Base
95 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
96 Electrical and Electronics Engineers, Inc and The Open Group. In the
97 event of any discrepancy between this version and the original IEEE and
98 The Open Group Standard, the original IEEE and The Open Group Standard
99 is the referee document. The original Standard can be obtained online
100 at http://www.opengroup.org/unix/online.html .
101IEEE/The Open Group 2003 PTHREAD_RWLOCKATTR_GETPSHARED(3P)