diff options
Diffstat (limited to 'c/src/lib/libbsp/unix/posix/shmsupp/lock.c')
-rw-r--r-- | c/src/lib/libbsp/unix/posix/shmsupp/lock.c | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/c/src/lib/libbsp/unix/posix/shmsupp/lock.c b/c/src/lib/libbsp/unix/posix/shmsupp/lock.c index 76a57d0a06..e69de29bb2 100644 --- a/c/src/lib/libbsp/unix/posix/shmsupp/lock.c +++ b/c/src/lib/libbsp/unix/posix/shmsupp/lock.c @@ -1,74 +0,0 @@ -/* Shared Memory Lock Routines - * - * This shared memory locked queue support routine need to be - * able to lock the specified locked queue. Interrupts are - * disabled while the queue is locked to prevent preemption - * and deadlock when two tasks poll for the same lock. - * previous level. - * - * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. - * On-Line Applications Research Corporation (OAR). - * All rights assigned to U.S. Government, 1994. - * - * This material may be reproduced by or for the U.S. Government pursuant - * to the copyright license under the clause at DFARS 252.227-7013. This - * notice must appear in all copies of this file and its derivatives. - * - * $Id$ - */ - -#include <bsp.h> -#include <shm.h> - -extern int semid; - -/* - * Shm_Initialize_lock - * - * Initialize the lock for the specified locked queue. - */ - -void Shm_Initialize_lock( - Shm_Locked_queue_Control *lq_cb -) -{ - lq_cb->lock = lq_cb - Shm_Locked_queues; -} - -/* Shm_Lock( &lq_cb ) - * - * This shared memory locked queue support routine locks the - * specified locked queue. It disables interrupts to prevent - * a deadlock condition. - */ - -void Shm_Lock( - Shm_Locked_queue_Control *lq_cb -) -{ - rtems_unsigned32 isr_level; - - rtems_interrupt_disable( isr_level ); - - Shm_isrstat = isr_level; - - _CPU_SHM_Lock( lq_cb->lock ); -} - -/* - * Shm_Unlock - * - * Unlock the lock for the specified locked queue. - */ - -void Shm_Unlock( - Shm_Locked_queue_Control *lq_cb -) -{ - rtems_unsigned32 isr_level; - - _CPU_SHM_Unlock( lq_cb->lock ); - - isr_level = Shm_isrstat; - rtems_interrupt_enable( isr_level ); -} |