sc_mutex.cc revision 13199
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/core/scheduler.hh" 32#include "systemc/ext/channel/sc_mutex.hh" 33#include "systemc/ext/core/sc_module.hh" // for sc_gen_unique_name 34 35namespace sc_core 36{ 37 38sc_mutex::sc_mutex() : sc_interface(), sc_mutex_if(), 39 sc_object(sc_gen_unique_name("mutex")) 40{} 41 42sc_mutex::sc_mutex(const char *name) : 43 sc_interface(), sc_mutex_if(), sc_object(name) 44{} 45 46int 47sc_mutex::lock() 48{ 49 while (trylock() == -1) 50 wait(unlockEvent); 51 return 0; 52} 53 54int 55sc_mutex::trylock() 56{ 57 if (holder.valid()) 58 return -1; 59 holder = ::sc_gem5::scheduler.current(); 60 return 0; 61} 62 63int 64sc_mutex::unlock() 65{ 66 if (holder != ::sc_gem5::scheduler.current()) 67 return -1; 68 69 holder = nullptr; 70 unlockEvent.notify(); 71 return 0; 72} 73 74} // namespace sc_core 75