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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 <string>
#include "systemc/ext/channel/messages.hh"
#include "systemc/ext/channel/sc_semaphore.hh"
#include "systemc/ext/core/sc_module.hh" // for sc_gen_unique_name
#include "systemc/ext/utils/sc_report_handler.hh"
namespace sc_core
{
sc_semaphore::sc_semaphore(int value) :
sc_semaphore(sc_gen_unique_name("semaphore"), value)
{}
sc_semaphore::sc_semaphore(const char *_name, int value) :
sc_interface(), sc_semaphore_if(), sc_object(_name), _value(value)
{
if (value < 0) {
std::string msg = "semaphore '" + std::string(name()) + "'";
SC_REPORT_ERROR(SC_ID_INVALID_SEMAPHORE_VALUE_, msg.c_str());
}
}
int
sc_semaphore::wait()
{
while (trywait() == -1)
::sc_core::wait(posted);
return 0;
}
int
sc_semaphore::trywait()
{
if (!_value)
return -1;
_value--;
return 0;
}
int
sc_semaphore::post()
{
if (_value++ == 0)
posted.notify();
return 0;
}
int sc_semaphore::get_value() const { return _value; }
} // namespace sc_core
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