NAME

pthread_rwlockattr_getpshared — get the process shared attribute

LIBRARY

POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

#include <pthread.h>

int
pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *restrict attr, int *restrict pshared);

DESCRIPTION

The pthread_rwlockattr_getpshared() function is used to get the process shared setting of a read/write lock attribute object. The setting is returned via pshared, and may be one of two values:

PTHREAD_PROCESS_SHARED

Any thread of any process that has access to the memory where the read/write lock resides can manipulate the lock.

PTHREAD_PROCESS_PRIVATE

Only threads created within the same process as the thread that initialized the read/write lock can manipulate the lock. This is the default value.

RETURN VALUES

If successful, the pthread_rwlockattr_getpshared() function will return zero. Otherwise an error number will be returned to indicate the error.

ERRORS

The pthread_rwlockattr_getpshared() function may fail if:

[EINVAL]

The value specified by attr is invalid.

SEE ALSO

pthread_rwlock_init(3), pthread_rwlockattr_init(3), pthread_rwlockattr_setpshared(3)

STANDARDS

The pthread_rwlockattr_getpshared() function is expected to conform to Version 2 of the Single UNIX Specification (“SUSv2”).

HISTORY

The pthread_rwlockattr_getpshared() function first appeared in FreeBSD 3.0.