tis_read_lock man page on DigitalUNIX

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tis_read_lock(3)					      tis_read_lock(3)

NAME
       tis_read_lock - Acquires a read-write lock for read access

SYNOPSIS
       #include <tis.h>

       int tis_read_lock(
	       tis_rwlock_t *lock );

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

STANDARDS
       None

PARAMETERS
       Address of the read-write lock.

DESCRIPTION
       This  routine  acquires a read-write lock for read access. This routine
       waits for any existing lock holder for write access to  relinquish  its
       lock  before  granting  the lock for read access.  This routine returns
       when the lock is acquired. If the lock is already held for read access,
       the lock is granted.

       For  each  call to tis_read_lock(3) that successfully acquires the lock
       for read access, a corresponding call  to  tis_read_unlock(3)  must  be
       issued.

       Note that the type tis_rwlock_p is a pointer to type tis_rwlock_t.

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 value specified by lock is invalid.

ERRORS
       None

SEE ALSO
       Functions:	    tis_read_trylock(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_lock(3)
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