set the process shared attribute
sets the process shared attribute of attr
the value referenced by pshared
may be one of two values:
- 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
If successful, the
will return zero. Otherwise an error number will be returned to indicate the
() will fail if:
- The value specified by attr or
pshared is invalid.
is expected to conform to Version 2 of the
Single UNIX Specification (“SUSv2”)
first appeared in FreeBSD 3.0
The PTHREAD_PROCESS_SHARED attribute is not supported.