VMS Help POSIX Threads, TIS routines, tis_write_unlock  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Unlocks a read-write lock that was acquired for write access.

1 - C Binding

    #include <tis.h>

    int
    tis_write_unlock (
             tis_rwlock_t   *lock);

2 - Arguments

 lock

    Address of the read-write lock to be unlocked.

3 - Description

    This routine unlocks a read-write lock that was acquired for
    write access.

    Upon completion of this routine, any thread waiting to acquire
    the lock for read access will have those acquisitions granted. If
    no threads are waiting to acquire the lock for read access, then
    a thread waiting to acquire it for write access will have that
    acquisition granted.

4 - Return Values

    If an error condition occurs, this routine returns an integer
    value indicating the type error. Possible return values are as
    follows:

    Return      Description

    0           Successful completion.
    [EINVAL]    The value specified by lock is not a valid read-write
                lock.

5 - Associated Routines

       tis_read_lock()
       tis_read_trylock()
       tis_read_unlock()
       tis_rwlock_init()
       tis_rwlock_destroy()
       tis_write_lock()
       tis_write_trylock()