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Rtos API example
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Semaphore.cpp
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2012 ARM Limited 00003 * 00004 * Permission is hereby granted, free of charge, to any person obtaining a copy 00005 * of this software and associated documentation files (the "Software"), to deal 00006 * in the Software without restriction, including without limitation the rights 00007 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00008 * copies of the Software, and to permit persons to whom the Software is 00009 * furnished to do so, subject to the following conditions: 00010 * 00011 * The above copyright notice and this permission notice shall be included in 00012 * all copies or substantial portions of the Software. 00013 * 00014 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00015 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00016 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00017 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00018 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00019 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 00020 * SOFTWARE. 00021 */ 00022 #include "rtos/Semaphore.h" 00023 #include "platform/mbed_assert.h" 00024 00025 #include <string.h> 00026 00027 namespace rtos { 00028 00029 Semaphore::Semaphore(int32_t count) { 00030 constructor(count, 0xffff); 00031 } 00032 00033 Semaphore::Semaphore(int32_t count, uint16_t max_count) { 00034 constructor(count, max_count); 00035 } 00036 00037 void Semaphore::constructor(int32_t count, uint16_t max_count) { 00038 memset(&_obj_mem, 0, sizeof(_obj_mem)); 00039 osSemaphoreAttr_t attr = { 0 }; 00040 attr.cb_mem = &_obj_mem; 00041 attr.cb_size = sizeof(_obj_mem); 00042 _id = osSemaphoreNew(max_count, count, &attr); 00043 MBED_ASSERT(_id != NULL); 00044 } 00045 00046 int32_t Semaphore::wait(uint32_t millisec) { 00047 osStatus_t stat = osSemaphoreAcquire(_id, millisec); 00048 switch (stat) { 00049 case osOK: 00050 return osSemaphoreGetCount(_id) + 1; 00051 case osErrorTimeout: 00052 case osErrorResource: 00053 return 0; 00054 case osErrorParameter: 00055 default: 00056 return -1; 00057 } 00058 } 00059 00060 osStatus Semaphore::release(void) { 00061 return osSemaphoreRelease(_id); 00062 } 00063 00064 Semaphore::~Semaphore() { 00065 osSemaphoreDelete(_id); 00066 } 00067 00068 }
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