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/*
* Copyright (C) 2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
*/
#include "config.h"
#include "IPCSemaphore.h"
#include <mach/mach.h>
namespace IPC {
Semaphore::Semaphore()
{
auto ret = semaphore_create(mach_task_self(), &m_semaphore, SYNC_POLICY_FIFO, 0);
ASSERT_UNUSED(ret, ret == KERN_SUCCESS);
}
Semaphore::Semaphore(Semaphore&& other)
: m_sendRight(WTFMove(other.m_sendRight))
, m_semaphore(std::exchange(other.m_semaphore, SEMAPHORE_NULL))
{
}
Semaphore::Semaphore(MachSendRight&& sendRight)
: m_sendRight(WTFMove(sendRight))
, m_semaphore(m_sendRight.sendRight())
{
ASSERT(m_sendRight);
}
Semaphore::~Semaphore()
{
destroy();
}
Semaphore& Semaphore::operator=(Semaphore&& other)
{
if (this != &other) {
destroy();
m_sendRight = WTFMove(other.m_sendRight);
m_semaphore = std::exchange(other.m_semaphore, SEMAPHORE_NULL);
}
return *this;
}
void Semaphore::signal()
{
auto ret = semaphore_signal(m_semaphore);
ASSERT_UNUSED(ret, ret == KERN_SUCCESS || ret == KERN_TERMINATED);
}
bool Semaphore::wait()
{
auto ret = semaphore_wait(m_semaphore);
ASSERT(ret == KERN_SUCCESS || ret == KERN_TERMINATED);
return ret == KERN_SUCCESS;
}
bool Semaphore::waitFor(Timeout timeout)
{
Seconds waitTime = timeout.secondsUntilDeadline();
auto seconds = waitTime.secondsAs<unsigned>();
auto ret = semaphore_timedwait(m_semaphore, { seconds, static_cast<clock_res_t>(waitTime.nanosecondsAs<uint64_t>() - seconds * NSEC_PER_SEC) });
ASSERT(ret == KERN_SUCCESS || ret == KERN_OPERATION_TIMED_OUT || ret == KERN_TERMINATED || ret == KERN_ABORTED);
return ret == KERN_SUCCESS;
}
MachSendRight Semaphore::createSendRight() const
{
return MachSendRight::create(m_semaphore);
}
void Semaphore::destroy()
{
if (m_sendRight) {
m_sendRight = MachSendRight();
m_semaphore = SEMAPHORE_NULL;
return;
}
if (m_semaphore == SEMAPHORE_NULL)
return;
auto ret = semaphore_destroy(mach_task_self(), m_semaphore);
ASSERT_UNUSED(ret, ret == KERN_SUCCESS);
m_semaphore = SEMAPHORE_NULL;
}
} // namespace IPC
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