AuroraRuntime/Source/IO/Loop/LSSemaphore.Linux.cpp

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/***
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Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.
File: LSSemaphore.Linux.cpp
2022-04-05 05:59:23 +00:00
Date: 2022-4-5
Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "LSSemaphore.hpp"
#include "LSFromFdNonblocking.hpp"
namespace Aurora::IO::Loop
{
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LSSemaphore::LSSemaphore()
{
}
LSSemaphore::LSSemaphore(AuUInt32 initialCount)
{
Init(initialCount);
}
LSSemaphore::LSSemaphore(int handle, int tag)
{
this->handle = handle;
}
LSSemaphore::~LSSemaphore()
{
if ((this->handle != 0) &&
(this->handle != -1))
{
::close(AuExchange(this->handle, -1));
}
}
void LSSemaphore::Init(AuUInt32 initialCount)
{
handle = ::eventfd(initialCount, EFD_SEMAPHORE | EFD_NONBLOCK | EFD_CLOEXEC);
}
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bool LSSemaphore::TryInit(AuUInt32 initialCount)
{
this->Init(initialCount);
return this->HasValidHandle();
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}
bool LSSemaphore::IsSignaledNonblocking()
{
AuUInt64 oldSemaphoreValue {};
return ::read(this->handle, &oldSemaphoreValue, sizeof(oldSemaphoreValue)) == 8;
}
bool LSSemaphore::AddOne()
{
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AuUInt64 plsNoOverflow { 1 };
if (::write(this->handle, &plsNoOverflow, sizeof(plsNoOverflow)) != 8)
{
// todo push error
return false;
}
return true;
}
bool LSSemaphore::AddMany(AuUInt32 uCount)
{
AuUInt64 plsNoOverflow { uCount };
if (::write(this->handle, &plsNoOverflow, sizeof(plsNoOverflow)) != 8)
{
// todo push error
return false;
}
return true;
}
bool LSSemaphore::OnTrigger(AuUInt handle)
{
return IsSignaledNonblocking();
}
bool LSSemaphore::IsSignaled()
{
return IsSignaledFromNonblockingImpl(this, this, &LSSemaphore::IsSignaledNonblocking, true);
}
bool LSSemaphore::IsSignaledExt(AuUInt8 uFlags)
{
return IsSignaledFromNonblockingImpl(this, this, &LSSemaphore::IsSignaledNonblocking, !(uFlags & kFlagLSTryNoIOAlerts));
}
bool LSSemaphore::WaitOn(AuUInt32 timeout)
{
return LSHandle::WaitOn(timeout);
}
ELoopSource LSSemaphore::GetType()
{
return ELoopSource::eSourceSemaphore;
}
AUKN_SYM AuSPtr<ILSSemaphore> NewLSSemaphoreSlow(AuUInt32 initialCount)
{
auto pSemaphore = AuMakeShared<LSSemaphore>(initialCount);
if (!pSemaphore)
{
return {};
}
if (!pSemaphore->HasValidHandle())
{
return {};
}
return pSemaphore;
}
}