BA / Mbed OS BaBoRo1

Erste version der Software für der Prototyp

mbed-os/rtos/Semaphore.cpp@4:75df35ef4fb6, 2018-03-30 (annotated)

Committer:
borlanic
Date:
Fri Mar 30 14:07:05 2018 +0000
Revision:
4:75df35ef4fb6
Parent:
0:380207fcb5c1 
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borlanic 0:380207fcb5c1 1 /* mbed Microcontroller Library
borlanic 0:380207fcb5c1 2 * Copyright (c) 2006-2012 ARM Limited
borlanic 0:380207fcb5c1 3 *
borlanic 0:380207fcb5c1 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
borlanic 0:380207fcb5c1 5 * of this software and associated documentation files (the "Software"), to deal
borlanic 0:380207fcb5c1 6 * in the Software without restriction, including without limitation the rights
borlanic 0:380207fcb5c1 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
borlanic 0:380207fcb5c1 8 * copies of the Software, and to permit persons to whom the Software is
borlanic 0:380207fcb5c1 9 * furnished to do so, subject to the following conditions:
borlanic 0:380207fcb5c1 10 *
borlanic 0:380207fcb5c1 11 * The above copyright notice and this permission notice shall be included in
borlanic 0:380207fcb5c1 12 * all copies or substantial portions of the Software.
borlanic 0:380207fcb5c1 13 *
borlanic 0:380207fcb5c1 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
borlanic 0:380207fcb5c1 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
borlanic 0:380207fcb5c1 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
borlanic 0:380207fcb5c1 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
borlanic 0:380207fcb5c1 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
borlanic 0:380207fcb5c1 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
borlanic 0:380207fcb5c1 20 * SOFTWARE.
borlanic 0:380207fcb5c1 21 */
borlanic 0:380207fcb5c1 22 #include "rtos/Semaphore.h"
borlanic 0:380207fcb5c1 23 #include "rtos/Kernel.h"
borlanic 0:380207fcb5c1 24 #include "platform/mbed_assert.h"
borlanic 0:380207fcb5c1 25
borlanic 0:380207fcb5c1 26 #include <string.h>
borlanic 0:380207fcb5c1 27
borlanic 0:380207fcb5c1 28 namespace rtos {
borlanic 0:380207fcb5c1 29
borlanic 0:380207fcb5c1 30 Semaphore::Semaphore(int32_t count) {
borlanic 0:380207fcb5c1 31 constructor(count, 0xffff);
borlanic 0:380207fcb5c1 32 }
borlanic 0:380207fcb5c1 33
borlanic 0:380207fcb5c1 34 Semaphore::Semaphore(int32_t count, uint16_t max_count) {
borlanic 0:380207fcb5c1 35 constructor(count, max_count);
borlanic 0:380207fcb5c1 36 }
borlanic 0:380207fcb5c1 37
borlanic 0:380207fcb5c1 38 void Semaphore::constructor(int32_t count, uint16_t max_count) {
borlanic 0:380207fcb5c1 39 memset(&_obj_mem, 0, sizeof(_obj_mem));
borlanic 0:380207fcb5c1 40 osSemaphoreAttr_t attr = { 0 };
borlanic 0:380207fcb5c1 41 attr.cb_mem = &_obj_mem;
borlanic 0:380207fcb5c1 42 attr.cb_size = sizeof(_obj_mem);
borlanic 0:380207fcb5c1 43 _id = osSemaphoreNew(max_count, count, &attr);
borlanic 0:380207fcb5c1 44 MBED_ASSERT(_id != NULL);
borlanic 0:380207fcb5c1 45 }
borlanic 0:380207fcb5c1 46
borlanic 0:380207fcb5c1 47 int32_t Semaphore::wait(uint32_t millisec) {
borlanic 0:380207fcb5c1 48 osStatus_t stat = osSemaphoreAcquire(_id, millisec);
borlanic 0:380207fcb5c1 49 switch (stat) {
borlanic 0:380207fcb5c1 50 case osOK:
borlanic 0:380207fcb5c1 51 return osSemaphoreGetCount(_id) + 1;
borlanic 0:380207fcb5c1 52 case osErrorTimeout:
borlanic 0:380207fcb5c1 53 case osErrorResource:
borlanic 0:380207fcb5c1 54 return 0;
borlanic 0:380207fcb5c1 55 case osErrorParameter:
borlanic 0:380207fcb5c1 56 default:
borlanic 0:380207fcb5c1 57 return -1;
borlanic 0:380207fcb5c1 58 }
borlanic 0:380207fcb5c1 59 }
borlanic 0:380207fcb5c1 60
borlanic 0:380207fcb5c1 61 int32_t Semaphore::wait_until(uint64_t millisec) {
borlanic 0:380207fcb5c1 62 uint64_t now = Kernel::get_ms_count();
borlanic 0:380207fcb5c1 63
borlanic 0:380207fcb5c1 64 if (now >= millisec) {
borlanic 0:380207fcb5c1 65 return wait(0);
borlanic 0:380207fcb5c1 66 } else if (millisec - now >= osWaitForever) {
borlanic 0:380207fcb5c1 67 // API permits early return
borlanic 0:380207fcb5c1 68 return wait(osWaitForever - 1);
borlanic 0:380207fcb5c1 69 } else {
borlanic 0:380207fcb5c1 70 return wait(millisec - now);
borlanic 0:380207fcb5c1 71 }
borlanic 0:380207fcb5c1 72 }
borlanic 0:380207fcb5c1 73
borlanic 0:380207fcb5c1 74 osStatus Semaphore::release(void) {
borlanic 0:380207fcb5c1 75 return osSemaphoreRelease(_id);
borlanic 0:380207fcb5c1 76 }
borlanic 0:380207fcb5c1 77
borlanic 0:380207fcb5c1 78 Semaphore::~Semaphore() {
borlanic 0:380207fcb5c1 79 osSemaphoreDelete(_id);
borlanic 0:380207fcb5c1 80 }
borlanic 0:380207fcb5c1 81
borlanic 0:380207fcb5c1 82 }