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/*
* Copyright 2018 Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Gabe Black
*/
#include "systemc/core/scheduler.hh"
#include "systemc/ext/channel/sc_mutex.hh"
#include "systemc/ext/core/sc_module.hh" // for sc_gen_unique_name
namespace sc_core
{
sc_mutex::sc_mutex() : sc_interface(), sc_mutex_if(),
sc_object(sc_gen_unique_name("mutex"))
{}
sc_mutex::sc_mutex(const char *name) :
sc_interface(), sc_mutex_if(), sc_object(name)
{}
int
sc_mutex::lock()
{
while (trylock() == -1)
wait(unlockEvent);
return 0;
}
int
sc_mutex::trylock()
{
if (holder.valid())
return -1;
holder = ::sc_gem5::scheduler.current();
return 0;
}
int
sc_mutex::unlock()
{
if (holder != ::sc_gem5::scheduler.current())
return -1;
holder = nullptr;
unlockEvent.notify();
return 0;
}
} // namespace sc_core
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