Denislam Valeev
/
Nucleo_rtos_basic
1
mbed-os/rtos/Mutex.cpp@0:e056ac8fecf8, 2018-03-13 (annotated)
- Committer:
- valeyev
- Date:
- Tue Mar 13 07:17:50 2018 +0000
- Revision:
- 0:e056ac8fecf8
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Who changed what in which revision?
User | Revision | Line number | New contents of line |
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valeyev | 0:e056ac8fecf8 | 1 | /* mbed Microcontroller Library |
valeyev | 0:e056ac8fecf8 | 2 | * Copyright (c) 2006-2012 ARM Limited |
valeyev | 0:e056ac8fecf8 | 3 | * |
valeyev | 0:e056ac8fecf8 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
valeyev | 0:e056ac8fecf8 | 5 | * of this software and associated documentation files (the "Software"), to deal |
valeyev | 0:e056ac8fecf8 | 6 | * in the Software without restriction, including without limitation the rights |
valeyev | 0:e056ac8fecf8 | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
valeyev | 0:e056ac8fecf8 | 8 | * copies of the Software, and to permit persons to whom the Software is |
valeyev | 0:e056ac8fecf8 | 9 | * furnished to do so, subject to the following conditions: |
valeyev | 0:e056ac8fecf8 | 10 | * |
valeyev | 0:e056ac8fecf8 | 11 | * The above copyright notice and this permission notice shall be included in |
valeyev | 0:e056ac8fecf8 | 12 | * all copies or substantial portions of the Software. |
valeyev | 0:e056ac8fecf8 | 13 | * |
valeyev | 0:e056ac8fecf8 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
valeyev | 0:e056ac8fecf8 | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
valeyev | 0:e056ac8fecf8 | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
valeyev | 0:e056ac8fecf8 | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
valeyev | 0:e056ac8fecf8 | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
valeyev | 0:e056ac8fecf8 | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
valeyev | 0:e056ac8fecf8 | 20 | * SOFTWARE. |
valeyev | 0:e056ac8fecf8 | 21 | */ |
valeyev | 0:e056ac8fecf8 | 22 | #include "rtos/Mutex.h" |
valeyev | 0:e056ac8fecf8 | 23 | #include "rtos/Kernel.h" |
valeyev | 0:e056ac8fecf8 | 24 | |
valeyev | 0:e056ac8fecf8 | 25 | #include <string.h> |
valeyev | 0:e056ac8fecf8 | 26 | #include "mbed_error.h" |
valeyev | 0:e056ac8fecf8 | 27 | #include "mbed_assert.h" |
valeyev | 0:e056ac8fecf8 | 28 | |
valeyev | 0:e056ac8fecf8 | 29 | namespace rtos { |
valeyev | 0:e056ac8fecf8 | 30 | |
valeyev | 0:e056ac8fecf8 | 31 | Mutex::Mutex(): _count(0) |
valeyev | 0:e056ac8fecf8 | 32 | { |
valeyev | 0:e056ac8fecf8 | 33 | constructor(); |
valeyev | 0:e056ac8fecf8 | 34 | } |
valeyev | 0:e056ac8fecf8 | 35 | |
valeyev | 0:e056ac8fecf8 | 36 | Mutex::Mutex(const char *name) |
valeyev | 0:e056ac8fecf8 | 37 | { |
valeyev | 0:e056ac8fecf8 | 38 | constructor(name); |
valeyev | 0:e056ac8fecf8 | 39 | } |
valeyev | 0:e056ac8fecf8 | 40 | |
valeyev | 0:e056ac8fecf8 | 41 | void Mutex::constructor(const char *name) |
valeyev | 0:e056ac8fecf8 | 42 | { |
valeyev | 0:e056ac8fecf8 | 43 | memset(&_obj_mem, 0, sizeof(_obj_mem)); |
valeyev | 0:e056ac8fecf8 | 44 | osMutexAttr_t attr = { 0 }; |
valeyev | 0:e056ac8fecf8 | 45 | attr.name = name ? name : "aplication_unnamed_mutex"; |
valeyev | 0:e056ac8fecf8 | 46 | attr.cb_mem = &_obj_mem; |
valeyev | 0:e056ac8fecf8 | 47 | attr.cb_size = sizeof(_obj_mem); |
valeyev | 0:e056ac8fecf8 | 48 | attr.attr_bits = osMutexRecursive | osMutexPrioInherit | osMutexRobust; |
valeyev | 0:e056ac8fecf8 | 49 | _id = osMutexNew(&attr); |
valeyev | 0:e056ac8fecf8 | 50 | MBED_ASSERT(_id); |
valeyev | 0:e056ac8fecf8 | 51 | } |
valeyev | 0:e056ac8fecf8 | 52 | |
valeyev | 0:e056ac8fecf8 | 53 | osStatus Mutex::lock(uint32_t millisec) { |
valeyev | 0:e056ac8fecf8 | 54 | osStatus status = osMutexAcquire(_id, millisec); |
valeyev | 0:e056ac8fecf8 | 55 | if (osOK == status) { |
valeyev | 0:e056ac8fecf8 | 56 | _count++; |
valeyev | 0:e056ac8fecf8 | 57 | } |
valeyev | 0:e056ac8fecf8 | 58 | return status; |
valeyev | 0:e056ac8fecf8 | 59 | } |
valeyev | 0:e056ac8fecf8 | 60 | |
valeyev | 0:e056ac8fecf8 | 61 | bool Mutex::trylock() { |
valeyev | 0:e056ac8fecf8 | 62 | return trylock_for(0); |
valeyev | 0:e056ac8fecf8 | 63 | } |
valeyev | 0:e056ac8fecf8 | 64 | |
valeyev | 0:e056ac8fecf8 | 65 | bool Mutex::trylock_for(uint32_t millisec) { |
valeyev | 0:e056ac8fecf8 | 66 | osStatus status = lock(millisec); |
valeyev | 0:e056ac8fecf8 | 67 | if (status == osOK) { |
valeyev | 0:e056ac8fecf8 | 68 | return true; |
valeyev | 0:e056ac8fecf8 | 69 | } |
valeyev | 0:e056ac8fecf8 | 70 | |
valeyev | 0:e056ac8fecf8 | 71 | MBED_ASSERT(status == osErrorTimeout || status == osErrorResource); |
valeyev | 0:e056ac8fecf8 | 72 | |
valeyev | 0:e056ac8fecf8 | 73 | return false; |
valeyev | 0:e056ac8fecf8 | 74 | } |
valeyev | 0:e056ac8fecf8 | 75 | |
valeyev | 0:e056ac8fecf8 | 76 | bool Mutex::trylock_until(uint64_t millisec) { |
valeyev | 0:e056ac8fecf8 | 77 | uint64_t now = Kernel::get_ms_count(); |
valeyev | 0:e056ac8fecf8 | 78 | |
valeyev | 0:e056ac8fecf8 | 79 | if (now >= millisec) { |
valeyev | 0:e056ac8fecf8 | 80 | return trylock(); |
valeyev | 0:e056ac8fecf8 | 81 | } else if (millisec - now >= osWaitForever) { |
valeyev | 0:e056ac8fecf8 | 82 | // API permits early return |
valeyev | 0:e056ac8fecf8 | 83 | return trylock_for(osWaitForever - 1); |
valeyev | 0:e056ac8fecf8 | 84 | } else { |
valeyev | 0:e056ac8fecf8 | 85 | return trylock_for(millisec - now); |
valeyev | 0:e056ac8fecf8 | 86 | } |
valeyev | 0:e056ac8fecf8 | 87 | } |
valeyev | 0:e056ac8fecf8 | 88 | |
valeyev | 0:e056ac8fecf8 | 89 | osStatus Mutex::unlock() { |
valeyev | 0:e056ac8fecf8 | 90 | _count--; |
valeyev | 0:e056ac8fecf8 | 91 | return osMutexRelease(_id); |
valeyev | 0:e056ac8fecf8 | 92 | } |
valeyev | 0:e056ac8fecf8 | 93 | |
valeyev | 0:e056ac8fecf8 | 94 | osThreadId Mutex::get_owner() { |
valeyev | 0:e056ac8fecf8 | 95 | return osMutexGetOwner(_id); |
valeyev | 0:e056ac8fecf8 | 96 | } |
valeyev | 0:e056ac8fecf8 | 97 | |
valeyev | 0:e056ac8fecf8 | 98 | Mutex::~Mutex() { |
valeyev | 0:e056ac8fecf8 | 99 | osMutexDelete(_id); |
valeyev | 0:e056ac8fecf8 | 100 | } |
valeyev | 0:e056ac8fecf8 | 101 | |
valeyev | 0:e056ac8fecf8 | 102 | } |