sc_semaphore.cc revision 13198
112841Sgabeblack@google.com/* 212841Sgabeblack@google.com * Copyright 2018 Google, Inc. 312841Sgabeblack@google.com * 412841Sgabeblack@google.com * Redistribution and use in source and binary forms, with or without 512841Sgabeblack@google.com * modification, are permitted provided that the following conditions are 612841Sgabeblack@google.com * met: redistributions of source code must retain the above copyright 712841Sgabeblack@google.com * notice, this list of conditions and the following disclaimer; 812841Sgabeblack@google.com * redistributions in binary form must reproduce the above copyright 912841Sgabeblack@google.com * notice, this list of conditions and the following disclaimer in the 1012841Sgabeblack@google.com * documentation and/or other materials provided with the distribution; 1112841Sgabeblack@google.com * neither the name of the copyright holders nor the names of its 1212841Sgabeblack@google.com * contributors may be used to endorse or promote products derived from 1312841Sgabeblack@google.com * this software without specific prior written permission. 1412841Sgabeblack@google.com * 1512841Sgabeblack@google.com * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 1612841Sgabeblack@google.com * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 1712841Sgabeblack@google.com * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 1812841Sgabeblack@google.com * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 1912841Sgabeblack@google.com * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 2012841Sgabeblack@google.com * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 2112841Sgabeblack@google.com * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2212841Sgabeblack@google.com * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2312841Sgabeblack@google.com * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2412841Sgabeblack@google.com * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2512841Sgabeblack@google.com * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2612841Sgabeblack@google.com * 2712841Sgabeblack@google.com * Authors: Gabe Black 2812841Sgabeblack@google.com */ 2912841Sgabeblack@google.com 3012841Sgabeblack@google.com#include "base/logging.hh" 3112841Sgabeblack@google.com#include "systemc/ext/channel/sc_semaphore.hh" 3212841Sgabeblack@google.com#include "systemc/ext/core/sc_module.hh" // for sc_gen_unique_name 3312841Sgabeblack@google.com 3412841Sgabeblack@google.comnamespace sc_core 3512841Sgabeblack@google.com{ 3612841Sgabeblack@google.com 3713198Sgabeblack@google.comsc_semaphore::sc_semaphore(int value) : 3812841Sgabeblack@google.com sc_interface(), sc_semaphore_if(), 3913198Sgabeblack@google.com sc_object(sc_gen_unique_name("semaphore")), _value(value) 4012841Sgabeblack@google.com{} 4112841Sgabeblack@google.com 4213198Sgabeblack@google.comsc_semaphore::sc_semaphore(const char *name, int value) : 4313198Sgabeblack@google.com sc_interface(), sc_semaphore_if(), sc_object(name), _value(value) 4412841Sgabeblack@google.com{} 4512841Sgabeblack@google.com 4612841Sgabeblack@google.comint 4712841Sgabeblack@google.comsc_semaphore::wait() 4812841Sgabeblack@google.com{ 4913198Sgabeblack@google.com while (trywait() == -1) 5013198Sgabeblack@google.com ::sc_core::wait(posted); 5112841Sgabeblack@google.com return 0; 5212841Sgabeblack@google.com} 5312841Sgabeblack@google.com 5412841Sgabeblack@google.comint 5512841Sgabeblack@google.comsc_semaphore::trywait() 5612841Sgabeblack@google.com{ 5713198Sgabeblack@google.com if (!_value) 5813198Sgabeblack@google.com return -1; 5913198Sgabeblack@google.com 6013198Sgabeblack@google.com _value--; 6112841Sgabeblack@google.com return 0; 6212841Sgabeblack@google.com} 6312841Sgabeblack@google.com 6412841Sgabeblack@google.comint 6512841Sgabeblack@google.comsc_semaphore::post() 6612841Sgabeblack@google.com{ 6713198Sgabeblack@google.com if (_value++ == 0) 6813198Sgabeblack@google.com posted.notify(); 6912841Sgabeblack@google.com return 0; 7012841Sgabeblack@google.com} 7112841Sgabeblack@google.com 7213198Sgabeblack@google.comint sc_semaphore::get_value() const { return _value; } 7312841Sgabeblack@google.com 7412841Sgabeblack@google.com} // namespace sc_core 75