tis_read_trylock(3) — Subroutines

NAME

tis_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

lockAddress 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:

0Successful completion; the lock was acquired.

[EBUSY]
The lock is being held for write access. The lock for read access was not acquired.

ERRORS