AuroraRuntime/Source/Loop/LSSemaphore.Linux.cpp

92 lines
2.0 KiB
C++

/***
Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.
File: LSSemaphore.Linux.cpp
Date: 2022-4-5
Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "LSSemaphore.hpp"
#include "LSFromFdNonblocking.hpp"
namespace Aurora::Loop
{
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);
}
bool LSSemaphore::IsSignaledNonblocking()
{
AuUInt64 oldSemaphoreValue {};
return read(this->handle, &oldSemaphoreValue, sizeof(oldSemaphoreValue)) == 8;
}
bool LSSemaphore::AddOne()
{
AuUInt64 plsNoOverflow {1};
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);
}
bool LSSemaphore::WaitOn(AuUInt32 timeout)
{
return LSHandle::WaitOn(timeout);
}
ELoopSource LSSemaphore::GetType()
{
return ELoopSource::eSourceSemaphore;
}
AUKN_SYM AuSPtr<ILSSemaphore> NewLSSemaphore(AuUInt32 initialCount)
{
auto semaphore = AuMakeShared<LSSemaphore>(initialCount);
if (!semaphore)
{
return {};
}
if (!semaphore->HasValidHandle())
{
return {};
}
return semaphore;
}
}