RTC auf true
rtos/Semaphore.cpp
- Committer:
- kevman
- Date:
- 2018-11-28
- Revision:
- 0:38ceb79fef03
File content as of revision 0:38ceb79fef03:
/* mbed Microcontroller Library * Copyright (c) 2006-2012 ARM Limited * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include "rtos/Semaphore.h" #include "rtos/Kernel.h" #include "platform/mbed_assert.h" #include <string.h> namespace rtos { Semaphore::Semaphore(int32_t count) { constructor(count, 0xffff); } Semaphore::Semaphore(int32_t count, uint16_t max_count) { constructor(count, max_count); } void Semaphore::constructor(int32_t count, uint16_t max_count) { memset(&_obj_mem, 0, sizeof(_obj_mem)); osSemaphoreAttr_t attr = { 0 }; attr.cb_mem = &_obj_mem; attr.cb_size = sizeof(_obj_mem); _id = osSemaphoreNew(max_count, count, &attr); MBED_ASSERT(_id != NULL); } int32_t Semaphore::wait(uint32_t millisec) { osStatus_t stat = osSemaphoreAcquire(_id, millisec); switch (stat) { case osOK: return osSemaphoreGetCount(_id) + 1; case osErrorTimeout: case osErrorResource: return 0; case osErrorParameter: default: return -1; } } int32_t Semaphore::wait_until(uint64_t millisec) { uint64_t now = Kernel::get_ms_count(); if (now >= millisec) { return wait(0); } else if (millisec - now >= osWaitForever) { // API permits early return return wait(osWaitForever - 1); } else { return wait(millisec - now); } } osStatus Semaphore::release(void) { return osSemaphoreRelease(_id); } Semaphore::~Semaphore() { osSemaphoreDelete(_id); } }