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
SYNOPSIS
#include <tis.h>
int tis_read_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.
DESCRIPTION
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.
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 was acquired. The lock is being held
for write access. The lock for read access was not acquired.
ERRORS
None
SEE ALSO
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
tis_read_trylock(3)