mirror of https://github.com/ARMmbed/mbed-os.git
90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2012 ARM Limited
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "rtos/Semaphore.h"
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#include "rtos/Kernel.h"
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#include "platform/mbed_assert.h"
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#include <string.h>
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namespace rtos {
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Semaphore::Semaphore(int32_t count)
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{
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constructor(count, 0xffff);
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}
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Semaphore::Semaphore(int32_t count, uint16_t max_count)
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{
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constructor(count, max_count);
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}
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void Semaphore::constructor(int32_t count, uint16_t max_count)
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{
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memset(&_obj_mem, 0, sizeof(_obj_mem));
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osSemaphoreAttr_t attr = { 0 };
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attr.cb_mem = &_obj_mem;
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attr.cb_size = sizeof(_obj_mem);
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_id = osSemaphoreNew(max_count, count, &attr);
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MBED_ASSERT(_id != NULL);
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}
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int32_t Semaphore::wait(uint32_t millisec)
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{
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osStatus_t stat = osSemaphoreAcquire(_id, millisec);
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switch (stat) {
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case osOK:
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return osSemaphoreGetCount(_id) + 1;
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case osErrorTimeout:
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case osErrorResource:
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return 0;
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case osErrorParameter:
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default:
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return -1;
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}
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}
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int32_t Semaphore::wait_until(uint64_t millisec)
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{
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uint64_t now = Kernel::get_ms_count();
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if (now >= millisec) {
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return wait(0);
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} else if (millisec - now >= osWaitForever) {
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// API permits early return
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return wait(osWaitForever - 1);
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} else {
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return wait(millisec - now);
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}
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}
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osStatus Semaphore::release(void)
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{
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return osSemaphoreRelease(_id);
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}
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Semaphore::~Semaphore()
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{
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osSemaphoreDelete(_id);
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}
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}
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