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mbed-rtos/rtos/Semaphore.h@0:d6c9b09b4042, 2020-12-02 (annotated)

Committer:
annieluo2
Date:
Wed Dec 02 18:02:03 2020 +0000
Revision:
0:d6c9b09b4042
boo

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annieluo2 0:d6c9b09b4042 1 /* mbed Microcontroller Library
annieluo2 0:d6c9b09b4042 2 * Copyright (c) 2006-2012 ARM Limited
annieluo2 0:d6c9b09b4042 3 *
annieluo2 0:d6c9b09b4042 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
annieluo2 0:d6c9b09b4042 5 * of this software and associated documentation files (the "Software"), to deal
annieluo2 0:d6c9b09b4042 6 * in the Software without restriction, including without limitation the rights
annieluo2 0:d6c9b09b4042 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
annieluo2 0:d6c9b09b4042 8 * copies of the Software, and to permit persons to whom the Software is
annieluo2 0:d6c9b09b4042 9 * furnished to do so, subject to the following conditions:
annieluo2 0:d6c9b09b4042 10 *
annieluo2 0:d6c9b09b4042 11 * The above copyright notice and this permission notice shall be included in
annieluo2 0:d6c9b09b4042 12 * all copies or substantial portions of the Software.
annieluo2 0:d6c9b09b4042 13 *
annieluo2 0:d6c9b09b4042 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
annieluo2 0:d6c9b09b4042 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
annieluo2 0:d6c9b09b4042 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
annieluo2 0:d6c9b09b4042 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
annieluo2 0:d6c9b09b4042 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
annieluo2 0:d6c9b09b4042 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
annieluo2 0:d6c9b09b4042 20 * SOFTWARE.
annieluo2 0:d6c9b09b4042 21 */
annieluo2 0:d6c9b09b4042 22 #ifndef SEMAPHORE_H
annieluo2 0:d6c9b09b4042 23 #define SEMAPHORE_H
annieluo2 0:d6c9b09b4042 24
annieluo2 0:d6c9b09b4042 25 #include <stdint.h>
annieluo2 0:d6c9b09b4042 26 #include "cmsis_os.h"
annieluo2 0:d6c9b09b4042 27
annieluo2 0:d6c9b09b4042 28 namespace rtos {
annieluo2 0:d6c9b09b4042 29 /** \addtogroup rtos */
annieluo2 0:d6c9b09b4042 30 /** @{*/
annieluo2 0:d6c9b09b4042 31
annieluo2 0:d6c9b09b4042 32 /** The Semaphore class is used to manage and protect access to a set of shared resources. */
annieluo2 0:d6c9b09b4042 33 class Semaphore {
annieluo2 0:d6c9b09b4042 34 public:
annieluo2 0:d6c9b09b4042 35 /** Create and Initialize a Semaphore object used for managing resources.
annieluo2 0:d6c9b09b4042 36 @param number of available resources; maximum index value is (count-1). (default: 0).
annieluo2 0:d6c9b09b4042 37 */
annieluo2 0:d6c9b09b4042 38 Semaphore(int32_t count=0);
annieluo2 0:d6c9b09b4042 39
annieluo2 0:d6c9b09b4042 40 /** Wait until a Semaphore resource becomes available.
annieluo2 0:d6c9b09b4042 41 @param millisec timeout value or 0 in case of no time-out. (default: osWaitForever).
annieluo2 0:d6c9b09b4042 42 @return number of available tokens, or -1 in case of incorrect parameters
annieluo2 0:d6c9b09b4042 43 */
annieluo2 0:d6c9b09b4042 44 int32_t wait(uint32_t millisec=osWaitForever);
annieluo2 0:d6c9b09b4042 45
annieluo2 0:d6c9b09b4042 46 /** Release a Semaphore resource that was obtain with Semaphore::wait.
annieluo2 0:d6c9b09b4042 47 @return status code that indicates the execution status of the function.
annieluo2 0:d6c9b09b4042 48 */
annieluo2 0:d6c9b09b4042 49 osStatus release(void);
annieluo2 0:d6c9b09b4042 50
annieluo2 0:d6c9b09b4042 51 ~Semaphore();
annieluo2 0:d6c9b09b4042 52
annieluo2 0:d6c9b09b4042 53 private:
annieluo2 0:d6c9b09b4042 54 osSemaphoreId _osSemaphoreId;
annieluo2 0:d6c9b09b4042 55 osSemaphoreDef_t _osSemaphoreDef;
annieluo2 0:d6c9b09b4042 56 #ifdef CMSIS_OS_RTX
annieluo2 0:d6c9b09b4042 57 uint32_t _semaphore_data[2];
annieluo2 0:d6c9b09b4042 58 #endif
annieluo2 0:d6c9b09b4042 59 };
annieluo2 0:d6c9b09b4042 60
annieluo2 0:d6c9b09b4042 61 }
annieluo2 0:d6c9b09b4042 62 #endif
annieluo2 0:d6c9b09b4042 63
annieluo2 0:d6c9b09b4042 64 /** @}*/