buf_lock(9r) osf1 man page | unix.com

BUF_LOCK(9r)															      BUF_LOCK(9r)

NAME
       BUF_LOCK - General: Locks the specified I/O buffer

SYNOPSIS
       void BUF_LOCK(
	       struct buf *bp );

ARGUMENTS
       Specifies a pointer to a buf structure.

DESCRIPTION
       The BUF_LOCK routine locks the specified I/O buffer.  The routine masks all disk and tape controller interrupts (by calling the splbio rou-
       tine). It sets the mutual exclusion buffer lock member, b_lock, of the specified buf structure pointer.

       The BUF_LOCK routine then sets the b_flags member of the specified buf structure pointer to B_BUSY to indicate that this  buffer  is  being
       used. Finally, BUF_LOCK resets the CPU priority level (by calling the splx routine).

NOTES
       You  should  design  in	your kernel modules to hold the I/O buffer lock for as short a period of time as possible to allow maximum concur-
       rency. You should also release the I/O buffer lock by calling the BUF_UNLOCK routine before returning from the module's entry point.

RETURN VALUES
       None

SEE ALSO
       Routines: BUF_UNLOCK(9r)

																      BUF_LOCK(9r)