tis_read_trylock - Attempts to acquire a read-write lock
for read access and does not wait if the lock cannot be
tis_rwlock_t *lock );
Standard C Library (libc.so, libc.a)
Address of the read-write lock to be acquired.
This routine attempts to acquire a read-write lock for
read access. If the lock cannot be granted, the routine
returns without waiting.
When a thread calls this routine, an attempt is made to
immediately acquire the lock for read access. If the lock
is acquired, zero (0) is returned. If a holder of the
lock for write access exists, [EBUSY] is returned.
If the lock cannot be acquired for read access immediately,
the calling program does not wait for the lock to
If an error condition occurs, this routine returns an
integer value indicating the type of error. Possible
return values are as follows: Successful completion; the
lock was acquired. The lock is being held for write
access. The lock for read access was not acquired.
Functions: tis_read_lock(3), tis_read_unlock(3),
Manuals: Guide to DECthreads and Programmer's Guide
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