1pthread_mutexattr_getpsharSetda(n3dCa)rd C Library Funpctthiroenasd_mutexattr_getpshared(3C)
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6 pthread_mutexattr_getpshared, pthread_mutexattr_setpshared - get or set
7 process-shared attribute
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10 cc -mt [ flag... ] file... -lpthread [ library... ]
11 #include <pthread.h>
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13 int pthread_mutexattr_getpshared(
14 const pthread_mutexattr_t *restrict attr,
15 int *restrict pshared);
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18 int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,
19 int pshared);
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23 The pthread_mutexattr_getpshared() function obtains the value of the
24 process-shared attribute from the attributes object referenced by attr.
25 The pthread_mutexattr_setpshared() function is used to set the process-
26 shared attribute in an initialized attributes object referenced by
27 attr.
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30 The process-shared attribute is set to PTHREAD_PROCESS_SHARED to per‐
31 mit a mutex to be operated upon by any thread that has access to the
32 memory where the mutex is allocated, even if the mutex is allocated in
33 memory that is shared by multiple processes. If the process-shared
34 attribute is PTHREAD_PROCESS_PRIVATE, the mutex will only be operated
35 upon by threads created within the same process as the thread that ini‐
36 tialized the mutex; if threads of differing processes attempt to oper‐
37 ate on such a mutex, the behavior is undefined. The default value of
38 the attribute is PTHREAD_PROCESS_PRIVATE.
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41 Upon successful completion, pthread_mutexattr_getpshared() returns 0
42 and stores the value of the process-shared attribute of attr into the
43 object referenced by the pshared parameter. Otherwise, an error number
44 is returned to indicate the error.
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47 Upon successful completion, pthread_mutexattr_setpshared() returns 0.
48 Otherwise, an error number is returned to indicate the error.
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51 The pthread_mutexattr_getpshared() and pthread_mutexattr_setpshared()
52 functions may fail if:
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54 EINVAL The value specified by attr is invalid.
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58 The pthread_mutexattr_setpshared() function may fail if:
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60 EINVAL The new value specified for the attribute is outside the
61 range of legal values for that attribute.
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65 See attributes(5) for descriptions of the following attributes:
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70 ┌─────────────────────────────┬─────────────────────────────┐
71 │ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
72 ├─────────────────────────────┼─────────────────────────────┤
73 │Interface Stability │Standard │
74 ├─────────────────────────────┼─────────────────────────────┤
75 │MT-Level │MT-Safe │
76 └─────────────────────────────┴─────────────────────────────┘
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79 pthread_create(3C), pthread_mutex_init(3C), pthread_mutexattr_init(3C),
80 pthread_cond_init(3C), attributes(5), standards(5)
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84SunOS 5.11 23 Mar 2005 pthread_mutexattr_getpshared(3C)