tis_write_trylock(3)tis_write_trylock(3)NAMEtis_write_trylock - Attempts to acquire the specified read-write lock
for write access
SYNOPSIS
#include <tis.h>
int tis_write_trylock(
tis_rwlock_t *lock );
LIBRARY
Standard C Library (libc.so, libc.a)
STANDARDS
None
PARAMETERS
Address of the read-write lock to be acquired for write access.
DESCRIPTION
This routine attempts to acquire a read-write lock for write access.
The routine attempts to immediately acquire the lock. If the lock is
acquired, zero (0) is returned. If the lock is held by another thread
(for either read or write access), [EBUSY] is returned and the calling
thread does not wait for the write-access lock to be acquired.
Note that it is a coding error to attempt to acquire the lock for write
access if the lock is already held by the calling thread. (However,
this routine returns [EBUSY] anyway, because no ownership error-check‐
ing takes place.)
RETURN VALUES
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 is acquired for write access. The lock
was not acquired for write access, as it is already held by another
thread.
ERRORS
None
SEE ALSO
Functions: tis_read_lock(3), tis_read_trylock(3), tis_read_unlock(3),
tis_rwlock_destroy(3), tis_rwlock_init(3), tis_write_lock(3),
tis_write_unlock(3)
Manuals: Guide to DECthreads and Programmer's Guide
tis_write_trylock(3)