pthread_mutexattr_getpshaStandard C Library Fupthread_mutexattr_getpshared(3C)NAME
pthread_mutexattr_getpshared, pthread_mutexattr_setpshared - get or set
process-shared attribute
SYNOPSIS
cc -mt [ flag... ] file... -lpthread [ library... ]
#include <pthread.h>
int pthread_mutexattr_getpshared(const pthread_mutexattr_t *restrict
attr, int *restrict pshared);
int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr, int
pshared);
DESCRIPTION
The pthread_mutexattr_getpshared() function obtains the value of the
process-shared attribute from the attributes object referenced by attr.
The pthread_mutexattr_setpshared() function is used to set the process-
shared attribute in an initialized attributes object referenced by
attr.
The process-shared attribute is set to PTHREAD_PROCESS_SHARED to per‐
mit a mutex to be operated upon by any thread that has access to the
memory where the mutex is allocated, even if the mutex is allocated in
memory that is shared by multiple processes. If the process-shared
attribute is PTHREAD_PROCESS_PRIVATE, the mutex will only be operated
upon by threads created within the same process as the thread that ini‐
tialized the mutex; if threads of differing processes attempt to oper‐
ate on such a mutex, the behavior is undefined. The default value of
the attribute is PTHREAD_PROCESS_PRIVATE.
RETURN VALUES
Upon successful completion, pthread_mutexattr_getpshared() returns 0
and stores the value of the process-shared attribute of attr into the
object referenced by the pshared parameter. Otherwise, an error number
is returned to indicate the error.
Upon successful completion, pthread_mutexattr_setpshared() returns 0.
Otherwise, an error number is returned to indicate the error.
ERRORS
The pthread_mutexattr_getpshared() and pthread_mutexattr_setpshared()
functions may fail if:
EINVAL The value specified by attr is invalid.
The pthread_mutexattr_setpshared() function may fail if:
EINVAL The new value specified for the attribute is outside
the range of legal values for that attribute.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOpthread_create(3C), pthread_mutex_init(3C), pthread_mutexattr_init(3C),
pthread_cond_init(3C), attributes(5), standards(5)SunOS 5.10 23 Mar 2005 pthread_mutexattr_getpshared(3C)
