critical-pal.c

00001 // ----------------------------------------------------------------------------
00002 // Copyright 2015-2017 ARM Ltd.
00003 //
00004 // SPDX-License-Identifier: Apache-2.0
00005 //
00006 // Licensed under the Apache License, Version 2.0 (the "License");
00007 // you may not use this file except in compliance with the License.
00008 // You may obtain a copy of the License at
00009 //
00010 //     http://www.apache.org/licenses/LICENSE-2.0
00011 //
00012 // Unless required by applicable law or agreed to in writing, software
00013 // distributed under the License is distributed on an "AS IS" BASIS,
00014 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00015 // See the License for the specific language governing permissions and
00016 // limitations under the License.
00017 // ----------------------------------------------------------------------------
00018 
00019 #if defined(ATOMIC_QUEUE_USE_PAL) && !defined(TARGET_LIKE_MBED)
00020 
00021 #include <stdint.h>
00022 #include <assert.h>
00023 #include <unistd.h>
00024 
00025 #include "pal.h"
00026 // Module include
00027 #include "aq_critical.h"
00028 
00029 static palMutexID_t mutex = NULLPTR;
00030 static volatile unsigned irq_nesting_depth = 0;
00031 
00032 void aq_critical_section_enter() {
00033     if (mutex == NULLPTR) {
00034         palStatus_t rc = pal_osMutexCreate(&mutex);
00035         assert(rc == PAL_SUCCESS);
00036     }
00037     if (++irq_nesting_depth > 1) {
00038         return;
00039     }
00040     palStatus_t rc = pal_osMutexWait(mutex, PAL_RTOS_WAIT_FOREVER);
00041     assert(rc == PAL_SUCCESS);
00042 }
00043 
00044 void aq_critical_section_exit(void) {
00045     assert(irq_nesting_depth > 0);
00046     if (--irq_nesting_depth == 0) {
00047         palStatus_t rc = pal_osMutexRelease(mutex);
00048         assert(rc == PAL_SUCCESS);
00049     }
00050 }
00051 
00052 #endif // defined(ATOMIC_QUEUE_USE_PAL)