get the process shared attribute
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
If successful, the
- Any thread of any process that has access to the memory where the
read/write lock resides can manipulate the lock.
- Only threads created within the same process as the thread that
initialized the read/write lock can manipulate the lock. This is the
function will return zero. Otherwise an error number will be returned to
indicate the error.
pthread_rwlockattr_getpshared() may fail if:
- The value specified by attr is invalid.
pthread_rwlockattr_getpshared() function is expected
to conform to Version 2 of the Single UNIX
pthread_rwlockattr_getpshared() function first
appeared in FreeBSD 3.0 and OpenBSD