1*10465441SEvalZero /* 2*10465441SEvalZero * Copyright (c) 2006-2018, RT-Thread Development Team 3*10465441SEvalZero * 4*10465441SEvalZero * SPDX-License-Identifier: Apache-2.0 5*10465441SEvalZero * 6*10465441SEvalZero * Change Logs: 7*10465441SEvalZero * Date Author Notes 8*10465441SEvalZero * 2016/10/1 Bernard The first version 9*10465441SEvalZero */ 10*10465441SEvalZero 11*10465441SEvalZero #pragma once 12*10465441SEvalZero 13*10465441SEvalZero #include <stdint.h> 14*10465441SEvalZero #include <rtthread.h> 15*10465441SEvalZero 16*10465441SEvalZero namespace rtthread { 17*10465441SEvalZero 18*10465441SEvalZero /** The Semaphore class is used to manage and protect access to a set of shared resources. */ 19*10465441SEvalZero class Semaphore 20*10465441SEvalZero { 21*10465441SEvalZero public: 22*10465441SEvalZero /** Create and Initialize a Semaphore object used for managing resources. 23*10465441SEvalZero @param number of available resources; maximum index value is (count-1). 24*10465441SEvalZero */ 25*10465441SEvalZero Semaphore(const char *name = "sem", int32_t count = 0); 26*10465441SEvalZero ~Semaphore(); 27*10465441SEvalZero 28*10465441SEvalZero /** Wait until a Semaphore resource becomes available. 29*10465441SEvalZero @param millisec timeout value or 0 in case of no time-out. 30*10465441SEvalZero @return true on success. 31*10465441SEvalZero */ 32*10465441SEvalZero bool wait(int32_t millisec = -1); 33*10465441SEvalZero 34*10465441SEvalZero /** Release a Semaphore resource that was obtain with Semaphore::wait. 35*10465441SEvalZero */ 36*10465441SEvalZero void release(void); 37*10465441SEvalZero 38*10465441SEvalZero private: 39*10465441SEvalZero struct rt_semaphore mID; 40*10465441SEvalZero }; 41*10465441SEvalZero 42*10465441SEvalZero } 43