diff options
Diffstat (limited to 'c/src/lib/libbsp/i960/cvme961/shmsupp/lock.c')
-rw-r--r-- | c/src/lib/libbsp/i960/cvme961/shmsupp/lock.c | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/c/src/lib/libbsp/i960/cvme961/shmsupp/lock.c b/c/src/lib/libbsp/i960/cvme961/shmsupp/lock.c deleted file mode 100644 index dfddd58fcf..0000000000 --- a/c/src/lib/libbsp/i960/cvme961/shmsupp/lock.c +++ /dev/null @@ -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) 1989-1999. - * On-Line Applications Research Corporation (OAR). - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.com/license/LICENSE. - * - * $Id$ - */ - -#include <rtems.h> -#include <bsp.h> -#include <shm_driver.h> - -/* - * 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_UNLOCKED; -} - -/* void _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 -) -{ - uint32_t isr_level, oldlock; - - rtems_interrupt_disable( isr_level ); - Shm_isrstat = isr_level; - while ( 1 ) { - atomic_modify( SHM_LOCK_VALUE, &lq_cb->lock, oldlock ); - if ( !(oldlock & SHM_LOCK_VALUE) ) - return; - rtems_bsp_delay( 28 ); /* delay 28 microseconds */ - } -} - -/* - * Shm_Unlock - * - * Unlock the lock for the specified locked queue. - */ - -void Shm_Unlock( - Shm_Locked_queue_Control *lq_cb -) -{ - uint32_t isr_level; - - lq_cb->lock = SHM_UNLOCK_VALUE; - isr_level = Shm_isrstat; - rtems_interrupt_enable( isr_level ); -} |