Marco Zecchini / Mbed OS Example_RTOS

Rtos API example

mbed-os/rtos/Semaphore.cpp@0:9fca2b23d0ba, 2019-02-23 (annotated)

Committer:
marcozecchini
Date:
Sat Feb 23 12:13:36 2019 +0000
Revision:
0:9fca2b23d0ba
final commit

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marcozecchini 0:9fca2b23d0ba 1 /* mbed Microcontroller Library
marcozecchini 0:9fca2b23d0ba 2 * Copyright (c) 2006-2012 ARM Limited
marcozecchini 0:9fca2b23d0ba 3 *
marcozecchini 0:9fca2b23d0ba 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
marcozecchini 0:9fca2b23d0ba 5 * of this software and associated documentation files (the "Software"), to deal
marcozecchini 0:9fca2b23d0ba 6 * in the Software without restriction, including without limitation the rights
marcozecchini 0:9fca2b23d0ba 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
marcozecchini 0:9fca2b23d0ba 8 * copies of the Software, and to permit persons to whom the Software is
marcozecchini 0:9fca2b23d0ba 9 * furnished to do so, subject to the following conditions:
marcozecchini 0:9fca2b23d0ba 10 *
marcozecchini 0:9fca2b23d0ba 11 * The above copyright notice and this permission notice shall be included in
marcozecchini 0:9fca2b23d0ba 12 * all copies or substantial portions of the Software.
marcozecchini 0:9fca2b23d0ba 13 *
marcozecchini 0:9fca2b23d0ba 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
marcozecchini 0:9fca2b23d0ba 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
marcozecchini 0:9fca2b23d0ba 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
marcozecchini 0:9fca2b23d0ba 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
marcozecchini 0:9fca2b23d0ba 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
marcozecchini 0:9fca2b23d0ba 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
marcozecchini 0:9fca2b23d0ba 20 * SOFTWARE.
marcozecchini 0:9fca2b23d0ba 21 */
marcozecchini 0:9fca2b23d0ba 22 #include "rtos/Semaphore.h"
marcozecchini 0:9fca2b23d0ba 23 #include "platform/mbed_assert.h"
marcozecchini 0:9fca2b23d0ba 24
marcozecchini 0:9fca2b23d0ba 25 #include <string.h>
marcozecchini 0:9fca2b23d0ba 26
marcozecchini 0:9fca2b23d0ba 27 namespace rtos {
marcozecchini 0:9fca2b23d0ba 28
marcozecchini 0:9fca2b23d0ba 29 Semaphore::Semaphore(int32_t count) {
marcozecchini 0:9fca2b23d0ba 30 constructor(count, 0xffff);
marcozecchini 0:9fca2b23d0ba 31 }
marcozecchini 0:9fca2b23d0ba 32
marcozecchini 0:9fca2b23d0ba 33 Semaphore::Semaphore(int32_t count, uint16_t max_count) {
marcozecchini 0:9fca2b23d0ba 34 constructor(count, max_count);
marcozecchini 0:9fca2b23d0ba 35 }
marcozecchini 0:9fca2b23d0ba 36
marcozecchini 0:9fca2b23d0ba 37 void Semaphore::constructor(int32_t count, uint16_t max_count) {
marcozecchini 0:9fca2b23d0ba 38 memset(&_obj_mem, 0, sizeof(_obj_mem));
marcozecchini 0:9fca2b23d0ba 39 osSemaphoreAttr_t attr = { 0 };
marcozecchini 0:9fca2b23d0ba 40 attr.cb_mem = &_obj_mem;
marcozecchini 0:9fca2b23d0ba 41 attr.cb_size = sizeof(_obj_mem);
marcozecchini 0:9fca2b23d0ba 42 _id = osSemaphoreNew(max_count, count, &attr);
marcozecchini 0:9fca2b23d0ba 43 MBED_ASSERT(_id != NULL);
marcozecchini 0:9fca2b23d0ba 44 }
marcozecchini 0:9fca2b23d0ba 45
marcozecchini 0:9fca2b23d0ba 46 int32_t Semaphore::wait(uint32_t millisec) {
marcozecchini 0:9fca2b23d0ba 47 osStatus_t stat = osSemaphoreAcquire(_id, millisec);
marcozecchini 0:9fca2b23d0ba 48 switch (stat) {
marcozecchini 0:9fca2b23d0ba 49 case osOK:
marcozecchini 0:9fca2b23d0ba 50 return osSemaphoreGetCount(_id) + 1;
marcozecchini 0:9fca2b23d0ba 51 case osErrorTimeout:
marcozecchini 0:9fca2b23d0ba 52 case osErrorResource:
marcozecchini 0:9fca2b23d0ba 53 return 0;
marcozecchini 0:9fca2b23d0ba 54 case osErrorParameter:
marcozecchini 0:9fca2b23d0ba 55 default:
marcozecchini 0:9fca2b23d0ba 56 return -1;
marcozecchini 0:9fca2b23d0ba 57 }
marcozecchini 0:9fca2b23d0ba 58 }
marcozecchini 0:9fca2b23d0ba 59
marcozecchini 0:9fca2b23d0ba 60 osStatus Semaphore::release(void) {
marcozecchini 0:9fca2b23d0ba 61 return osSemaphoreRelease(_id);
marcozecchini 0:9fca2b23d0ba 62 }
marcozecchini 0:9fca2b23d0ba 63
marcozecchini 0:9fca2b23d0ba 64 Semaphore::~Semaphore() {
marcozecchini 0:9fca2b23d0ba 65 osSemaphoreDelete(_id);
marcozecchini 0:9fca2b23d0ba 66 }
marcozecchini 0:9fca2b23d0ba 67
marcozecchini 0:9fca2b23d0ba 68 }