tis_read_trylock(3)tis_read_trylock(3)NAMEtis_read_trylock - Attempts to acquire a read-write lock for read
access and does not wait if the lock cannot be immediately granted
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
If the lock cannot be acquired for read access immediately, the calling
program does not wait for the lock to be released.
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), tis_rwlock_destroy(3),
tis_rwlock_init(3), tis_write_lock(3), tis_write_trylock(3),
Manuals: Guide to DECthreads and Programmer's Guide