1 /* 2 * Copyright 2021 Rockchip Electronics Co. LTD 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define MODULE_TAG "mpp_lock" 18 19 #include "mpp_log.h" 20 #include "mpp_lock.h" 21 22 #define LOCK_IDLE 0 23 #define LOCK_BUSY 1 24 mpp_spinlock_init(spinlock_t * lock)25void mpp_spinlock_init(spinlock_t *lock) 26 { 27 MPP_SYNC_CLR(&lock->lock); 28 } 29 mpp_spinlock_lock(spinlock_t * lock)30void mpp_spinlock_lock(spinlock_t *lock) 31 { 32 while (!MPP_BOOL_CAS(&lock->lock, LOCK_IDLE, LOCK_BUSY)) { 33 asm("NOP"); 34 asm("NOP"); 35 } 36 } 37 mpp_spinlock_unlock(spinlock_t * lock)38void mpp_spinlock_unlock(spinlock_t *lock) 39 { 40 MPP_SYNC_CLR(&lock->lock); 41 } 42 mpp_spinlock_trylock(spinlock_t * lock)43bool mpp_spinlock_trylock(spinlock_t *lock) 44 { 45 return MPP_BOOL_CAS(&lock->lock, LOCK_IDLE, LOCK_BUSY); 46 } 47