NAME
pthread_rwlockattr_getpshared —
get the process shared
attribute
SYNOPSIS
#include
<pthread.h>
int
pthread_rwlockattr_getpshared(const
pthread_rwlockattr_t *attr,
int *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
pthread_rwlockattr_getpshared() 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 and
OpenBSD 2.5.