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tis_read_trylock(3)
NAME
  tis_read_trylock - Attempts to acquire a read-write lock for read access.
  Does not wait if the lock cannot be immediately granted.

LIBRARY
  Standard C Library (libc.so, libc.a)

SYNOPSIS
  #include <tis.h>

  int	tis_read_trylock(
			 tis_rwlock_t	*lock);

STANDARDS
  None

PARAMETERS
  *lock	    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:

  0	    Successful completion; the lock was acquired.

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

ERRORS
  None




RELATED INFORMATION
  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