111 lines
2.4 KiB
C++
111 lines
2.4 KiB
C++
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: LSMutex.Linux.cpp
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Date: 2021-10-1
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Date: 2022-4-4
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Author: Reece
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***/
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#include <Source/RuntimeInternal.hpp>
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#include "LSMutex.hpp"
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#include "LSFromFdNonblocking.hpp"
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namespace Aurora::IO::Loop
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{
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LSMutex::LSMutex()
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{
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Init();
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}
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LSMutex::LSMutex(int handle)
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{
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this->handle = handle;
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}
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LSMutex::~LSMutex()
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{
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if ((!this->bOwns) &&
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(!this->bNoAutoRel /*must the remote grug clean up the IPC mutex? lets not hit a double unlock assert...*/))
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{
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SysPushErrorIO("Mutex owned by calling process during destruction... Forcefully unlocking...");
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Unlock();
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}
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if ((this->handle != 0) &&
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(this->handle != -1))
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{
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::close(AuExchange(this->handle, -1));
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}
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}
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bool LSMutex::OnTrigger(AuUInt handle)
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{
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return IsSignaledNonblocking();
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}
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void LSMutex::Init()
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{
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handle = ::eventfd(1, EFD_NONBLOCK | EFD_CLOEXEC );
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}
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bool LSMutex::Unlock()
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{
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AuUInt64 plsNoOverflow {1};
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bool ok = ::write(this->handle, &plsNoOverflow, sizeof(plsNoOverflow)) == 8;
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if (ok)
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{
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this->bOwns = false;
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}
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return ok;
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}
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bool LSMutex::IsSignaled()
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{
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return IsSignaledFromNonblockingImpl(this, this, &LSMutex::IsSignaledNonblocking);
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}
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bool LSMutex::WaitOn(AuUInt32 timeout)
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{
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return LSHandle::WaitOn(timeout);
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}
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bool LSMutex::IsSignaledNonblocking()
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{
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AuUInt64 oldSemaphoreValue {};
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auto read = ::read(this->handle, &oldSemaphoreValue, sizeof(oldSemaphoreValue));
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auto ok = read == 8;
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SysAssertDbg(!ok || oldSemaphoreValue == 1, "Double unlock caught");
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if (!ok)
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{
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// TODO: Might hook here
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}
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else
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{
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this->bOwns = true;
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}
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return ok;
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}
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ELoopSource LSMutex::GetType()
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{
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return ELoopSource::eSourceMutex;
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}
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#if 0
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AUKN_SYM AuSPtr<ILSMutex> NewLSMutex()
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{
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auto pMutex = AuMakeShared<LSMutex>();
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if (!pMutex)
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{
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return {};
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}
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if (!pMutex->HasValidHandle())
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{
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return {};
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}
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return pMutex;
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}
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#endif
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} |