EL4121 Embedded System / mbed-os

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependents:   cobaLCDJoyMotor_Thread odometry_omni_3roda_v3 odometry_omni_3roda_v1 odometry_omni_3roda_v2 ... more

rtos/Semaphore.cpp@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /* mbed Microcontroller Library
be_bryan 0:b74591d5ab33 2 * Copyright (c) 2006-2012 ARM Limited
be_bryan 0:b74591d5ab33 3 *
be_bryan 0:b74591d5ab33 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
be_bryan 0:b74591d5ab33 5 * of this software and associated documentation files (the "Software"), to deal
be_bryan 0:b74591d5ab33 6 * in the Software without restriction, including without limitation the rights
be_bryan 0:b74591d5ab33 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
be_bryan 0:b74591d5ab33 8 * copies of the Software, and to permit persons to whom the Software is
be_bryan 0:b74591d5ab33 9 * furnished to do so, subject to the following conditions:
be_bryan 0:b74591d5ab33 10 *
be_bryan 0:b74591d5ab33 11 * The above copyright notice and this permission notice shall be included in
be_bryan 0:b74591d5ab33 12 * all copies or substantial portions of the Software.
be_bryan 0:b74591d5ab33 13 *
be_bryan 0:b74591d5ab33 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
be_bryan 0:b74591d5ab33 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
be_bryan 0:b74591d5ab33 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
be_bryan 0:b74591d5ab33 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
be_bryan 0:b74591d5ab33 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
be_bryan 0:b74591d5ab33 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
be_bryan 0:b74591d5ab33 20 * SOFTWARE.
be_bryan 0:b74591d5ab33 21 */
be_bryan 0:b74591d5ab33 22 #include "rtos/Semaphore.h"
be_bryan 0:b74591d5ab33 23 #include "platform/mbed_assert.h"
be_bryan 0:b74591d5ab33 24
be_bryan 0:b74591d5ab33 25 #include <string.h>
be_bryan 0:b74591d5ab33 26
be_bryan 0:b74591d5ab33 27 namespace rtos {
be_bryan 0:b74591d5ab33 28
be_bryan 0:b74591d5ab33 29 Semaphore::Semaphore(int32_t count) {
be_bryan 0:b74591d5ab33 30 constructor(count, 0xffff);
be_bryan 0:b74591d5ab33 31 }
be_bryan 0:b74591d5ab33 32
be_bryan 0:b74591d5ab33 33 Semaphore::Semaphore(int32_t count, uint16_t max_count) {
be_bryan 0:b74591d5ab33 34 constructor(count, max_count);
be_bryan 0:b74591d5ab33 35 }
be_bryan 0:b74591d5ab33 36
be_bryan 0:b74591d5ab33 37 void Semaphore::constructor(int32_t count, uint16_t max_count) {
be_bryan 0:b74591d5ab33 38 memset(&_obj_mem, 0, sizeof(_obj_mem));
be_bryan 0:b74591d5ab33 39 osSemaphoreAttr_t attr = { 0 };
be_bryan 0:b74591d5ab33 40 attr.cb_mem = &_obj_mem;
be_bryan 0:b74591d5ab33 41 attr.cb_size = sizeof(_obj_mem);
be_bryan 0:b74591d5ab33 42 _id = osSemaphoreNew(max_count, count, &attr);
be_bryan 0:b74591d5ab33 43 MBED_ASSERT(_id != NULL);
be_bryan 0:b74591d5ab33 44 }
be_bryan 0:b74591d5ab33 45
be_bryan 0:b74591d5ab33 46 int32_t Semaphore::wait(uint32_t millisec) {
be_bryan 0:b74591d5ab33 47 osStatus_t stat = osSemaphoreAcquire(_id, millisec);
be_bryan 0:b74591d5ab33 48 switch (stat) {
be_bryan 0:b74591d5ab33 49 case osOK:
be_bryan 0:b74591d5ab33 50 return osSemaphoreGetCount(_id) + 1;
be_bryan 0:b74591d5ab33 51 case osErrorTimeout:
be_bryan 0:b74591d5ab33 52 case osErrorResource:
be_bryan 0:b74591d5ab33 53 return 0;
be_bryan 0:b74591d5ab33 54 case osErrorParameter:
be_bryan 0:b74591d5ab33 55 default:
be_bryan 0:b74591d5ab33 56 return -1;
be_bryan 0:b74591d5ab33 57 }
be_bryan 0:b74591d5ab33 58 }
be_bryan 0:b74591d5ab33 59
be_bryan 0:b74591d5ab33 60 osStatus Semaphore::release(void) {
be_bryan 0:b74591d5ab33 61 return osSemaphoreRelease(_id);
be_bryan 0:b74591d5ab33 62 }
be_bryan 0:b74591d5ab33 63
be_bryan 0:b74591d5ab33 64 Semaphore::~Semaphore() {
be_bryan 0:b74591d5ab33 65 osSemaphoreDelete(_id);
be_bryan 0:b74591d5ab33 66 }
be_bryan 0:b74591d5ab33 67
be_bryan 0:b74591d5ab33 68 }