Daniel Vizcaya / Mbed OS 04_RTOS_Embebidos

Entrega 3er corte - sistemas embebidos

mbed-os/rtos/Mutex.cpp@1:fcdb45ee95b9, 2018-05-30 (annotated)

Committer:
Bethory
Date:
Wed May 30 04:46:28 2018 +0000
Revision:
1:fcdb45ee95b9
Parent:
0:6ad07c9019fd 
Entrega Final

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Bethory 0:6ad07c9019fd 1 /* mbed Microcontroller Library
Bethory 0:6ad07c9019fd 2 * Copyright (c) 2006-2012 ARM Limited
Bethory 0:6ad07c9019fd 3 *
Bethory 0:6ad07c9019fd 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
Bethory 0:6ad07c9019fd 5 * of this software and associated documentation files (the "Software"), to deal
Bethory 0:6ad07c9019fd 6 * in the Software without restriction, including without limitation the rights
Bethory 0:6ad07c9019fd 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
Bethory 0:6ad07c9019fd 8 * copies of the Software, and to permit persons to whom the Software is
Bethory 0:6ad07c9019fd 9 * furnished to do so, subject to the following conditions:
Bethory 0:6ad07c9019fd 10 *
Bethory 0:6ad07c9019fd 11 * The above copyright notice and this permission notice shall be included in
Bethory 0:6ad07c9019fd 12 * all copies or substantial portions of the Software.
Bethory 0:6ad07c9019fd 13 *
Bethory 0:6ad07c9019fd 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Bethory 0:6ad07c9019fd 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Bethory 0:6ad07c9019fd 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
Bethory 0:6ad07c9019fd 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Bethory 0:6ad07c9019fd 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
Bethory 0:6ad07c9019fd 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
Bethory 0:6ad07c9019fd 20 * SOFTWARE.
Bethory 0:6ad07c9019fd 21 */
Bethory 0:6ad07c9019fd 22 #include "rtos/Mutex.h"
Bethory 0:6ad07c9019fd 23 #include "rtos/Kernel.h"
Bethory 0:6ad07c9019fd 24
Bethory 0:6ad07c9019fd 25 #include <string.h>
Bethory 0:6ad07c9019fd 26 #include "mbed_error.h"
Bethory 0:6ad07c9019fd 27 #include "mbed_assert.h"
Bethory 0:6ad07c9019fd 28
Bethory 0:6ad07c9019fd 29 namespace rtos {
Bethory 0:6ad07c9019fd 30
Bethory 0:6ad07c9019fd 31 Mutex::Mutex(): _count(0)
Bethory 0:6ad07c9019fd 32 {
Bethory 0:6ad07c9019fd 33 constructor();
Bethory 0:6ad07c9019fd 34 }
Bethory 0:6ad07c9019fd 35
Bethory 0:6ad07c9019fd 36 Mutex::Mutex(const char *name)
Bethory 0:6ad07c9019fd 37 {
Bethory 0:6ad07c9019fd 38 constructor(name);
Bethory 0:6ad07c9019fd 39 }
Bethory 0:6ad07c9019fd 40
Bethory 0:6ad07c9019fd 41 void Mutex::constructor(const char *name)
Bethory 0:6ad07c9019fd 42 {
Bethory 0:6ad07c9019fd 43 memset(&_obj_mem, 0, sizeof(_obj_mem));
Bethory 0:6ad07c9019fd 44 osMutexAttr_t attr = { 0 };
Bethory 0:6ad07c9019fd 45 attr.name = name ? name : "aplication_unnamed_mutex";
Bethory 0:6ad07c9019fd 46 attr.cb_mem = &_obj_mem;
Bethory 0:6ad07c9019fd 47 attr.cb_size = sizeof(_obj_mem);
Bethory 0:6ad07c9019fd 48 attr.attr_bits = osMutexRecursive | osMutexPrioInherit | osMutexRobust;
Bethory 0:6ad07c9019fd 49 _id = osMutexNew(&attr);
Bethory 0:6ad07c9019fd 50 MBED_ASSERT(_id);
Bethory 0:6ad07c9019fd 51 }
Bethory 0:6ad07c9019fd 52
Bethory 0:6ad07c9019fd 53 osStatus Mutex::lock(uint32_t millisec) {
Bethory 0:6ad07c9019fd 54 osStatus status = osMutexAcquire(_id, millisec);
Bethory 0:6ad07c9019fd 55 if (osOK == status) {
Bethory 0:6ad07c9019fd 56 _count++;
Bethory 0:6ad07c9019fd 57 }
Bethory 0:6ad07c9019fd 58 return status;
Bethory 0:6ad07c9019fd 59 }
Bethory 0:6ad07c9019fd 60
Bethory 0:6ad07c9019fd 61 bool Mutex::trylock() {
Bethory 0:6ad07c9019fd 62 return trylock_for(0);
Bethory 0:6ad07c9019fd 63 }
Bethory 0:6ad07c9019fd 64
Bethory 0:6ad07c9019fd 65 bool Mutex::trylock_for(uint32_t millisec) {
Bethory 0:6ad07c9019fd 66 osStatus status = lock(millisec);
Bethory 0:6ad07c9019fd 67 if (status == osOK) {
Bethory 0:6ad07c9019fd 68 return true;
Bethory 0:6ad07c9019fd 69 }
Bethory 0:6ad07c9019fd 70
Bethory 0:6ad07c9019fd 71 MBED_ASSERT(status == osErrorTimeout || status == osErrorResource);
Bethory 0:6ad07c9019fd 72
Bethory 0:6ad07c9019fd 73 return false;
Bethory 0:6ad07c9019fd 74 }
Bethory 0:6ad07c9019fd 75
Bethory 0:6ad07c9019fd 76 bool Mutex::trylock_until(uint64_t millisec) {
Bethory 0:6ad07c9019fd 77 uint64_t now = Kernel::get_ms_count();
Bethory 0:6ad07c9019fd 78
Bethory 0:6ad07c9019fd 79 if (now >= millisec) {
Bethory 0:6ad07c9019fd 80 return trylock();
Bethory 0:6ad07c9019fd 81 } else if (millisec - now >= osWaitForever) {
Bethory 0:6ad07c9019fd 82 // API permits early return
Bethory 0:6ad07c9019fd 83 return trylock_for(osWaitForever - 1);
Bethory 0:6ad07c9019fd 84 } else {
Bethory 0:6ad07c9019fd 85 return trylock_for(millisec - now);
Bethory 0:6ad07c9019fd 86 }
Bethory 0:6ad07c9019fd 87 }
Bethory 0:6ad07c9019fd 88
Bethory 0:6ad07c9019fd 89 osStatus Mutex::unlock() {
Bethory 0:6ad07c9019fd 90 _count--;
Bethory 0:6ad07c9019fd 91 return osMutexRelease(_id);
Bethory 0:6ad07c9019fd 92 }
Bethory 0:6ad07c9019fd 93
Bethory 0:6ad07c9019fd 94 osThreadId Mutex::get_owner() {
Bethory 0:6ad07c9019fd 95 return osMutexGetOwner(_id);
Bethory 0:6ad07c9019fd 96 }
Bethory 0:6ad07c9019fd 97
Bethory 0:6ad07c9019fd 98 Mutex::~Mutex() {
Bethory 0:6ad07c9019fd 99 osMutexDelete(_id);
Bethory 0:6ad07c9019fd 100 }
Bethory 0:6ad07c9019fd 101
Bethory 0:6ad07c9019fd 102 }