tis_read_trylock - Attempts to acquire a read-write lock for read access. Does not wait if the lock cannot be immediately granted.
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 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), tis_write_unlock(3)
Manuals: Guide to DECthreads and Programmer's Guide delim off