sc_semaphore.cc revision 13198
1/* 2 * Copyright 2018 Google, Inc. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: redistributions of source code must retain the above copyright 7 * notice, this list of conditions and the following disclaimer; 8 * redistributions in binary form must reproduce the above copyright 9 * notice, this list of conditions and the following disclaimer in the 10 * documentation and/or other materials provided with the distribution; 11 * neither the name of the copyright holders nor the names of its 12 * contributors may be used to endorse or promote products derived from 13 * this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 19 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * Authors: Gabe Black 28 */ 29 30#include "base/logging.hh" 31#include "systemc/ext/channel/sc_semaphore.hh" 32#include "systemc/ext/core/sc_module.hh" // for sc_gen_unique_name 33 34namespace sc_core 35{ 36 37sc_semaphore::sc_semaphore(int value) : 38 sc_interface(), sc_semaphore_if(), 39 sc_object(sc_gen_unique_name("semaphore")), _value(value) 40{} 41 42sc_semaphore::sc_semaphore(const char *name, int value) : 43 sc_interface(), sc_semaphore_if(), sc_object(name), _value(value) 44{} 45 46int 47sc_semaphore::wait() 48{ 49 while (trywait() == -1) 50 ::sc_core::wait(posted); 51 return 0; 52} 53 54int 55sc_semaphore::trywait() 56{ 57 if (!_value) 58 return -1; 59 60 _value--; 61 return 0; 62} 63 64int 65sc_semaphore::post() 66{ 67 if (_value++ == 0) 68 posted.notify(); 69 return 0; 70} 71 72int sc_semaphore::get_value() const { return _value; } 73 74} // namespace sc_core 75