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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() { 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)
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