Remove Reactor/MutexLock.hpp
It was already unused.
Bug: b/129403963
Change-Id: Idd4d7d1b64bb6380364e86823787ce54bc1cf8ab
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/39730
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
diff --git a/src/Reactor/LLVMReactor.cpp b/src/Reactor/LLVMReactor.cpp
index 70ada9c..f64f910 100644
--- a/src/Reactor/LLVMReactor.cpp
+++ b/src/Reactor/LLVMReactor.cpp
@@ -19,7 +19,6 @@
#include "CPUID.hpp"
#include "ExecutableMemory.hpp"
-#include "MutexLock.hpp"
#include "Thread.hpp"
#include "x86.hpp"
diff --git a/src/Reactor/MutexLock.hpp b/src/Reactor/MutexLock.hpp
deleted file mode 100644
index 94b37f0..0000000
--- a/src/Reactor/MutexLock.hpp
+++ /dev/null
@@ -1,179 +0,0 @@
-// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef rr_MutexLock_hpp
-#define rr_MutexLock_hpp
-
-#include "Thread.hpp"
-
-#if defined(__linux__)
-// Use a pthread mutex on Linux. Since many processes may use Reactor
-// at the same time it's best to just have the scheduler overhead.
-# include <pthread.h>
-
-namespace rr {
-
-class MutexLock
-{
-public:
- MutexLock()
- {
- pthread_mutex_init(&mutex, NULL);
- }
-
- ~MutexLock()
- {
- pthread_mutex_destroy(&mutex);
- }
-
- bool attemptLock()
- {
- return pthread_mutex_trylock(&mutex) == 0;
- }
-
- void lock()
- {
- pthread_mutex_lock(&mutex);
- }
-
- void unlock()
- {
- pthread_mutex_unlock(&mutex);
- }
-
-private:
- pthread_mutex_t mutex;
-};
-
-} // namespace rr
-
-#else // !__linux__
-
-# include <atomic>
-
-namespace rr {
-
-class BackoffLock
-{
-public:
- BackoffLock()
- {
- mutex = 0;
- }
-
- bool attemptLock()
- {
- if(!isLocked())
- {
- if(mutex.exchange(true) == false)
- {
- return true;
- }
- }
-
- return false;
- }
-
- void lock()
- {
- int backoff = 1;
-
- while(!attemptLock())
- {
- if(backoff <= 64)
- {
- for(int i = 0; i < backoff; i++)
- {
- nop();
- nop();
- nop();
- nop();
- nop();
-
- nop();
- nop();
- nop();
- nop();
- nop();
-
- nop();
- nop();
- nop();
- nop();
- nop();
-
- nop();
- nop();
- nop();
- nop();
- nop();
-
- nop();
- nop();
- nop();
- nop();
- nop();
-
- nop();
- nop();
- nop();
- nop();
- nop();
-
- nop();
- nop();
- nop();
- nop();
- nop();
- }
-
- backoff *= 2;
- }
- else
- {
- Thread::yield();
-
- backoff = 1;
- }
- };
- }
-
- void unlock()
- {
- mutex.store(false, std::memory_order_release);
- }
-
- bool isLocked()
- {
- return mutex.load(std::memory_order_acquire);
- }
-
-private:
- struct
- {
- // Ensure that the mutex variable is on its own 64-byte cache line to avoid false sharing
- // Padding must be public to avoid compiler warnings
- volatile int padding1[16];
- std::atomic<bool> mutex;
- volatile int padding2[15];
- };
-};
-
-using MutexLock = BackoffLock;
-
-} // namespace rr
-
-#endif // !__linux__
-
-#endif // rr_MutexLock_hpp
diff --git a/src/Reactor/Reactor.vcxproj b/src/Reactor/Reactor.vcxproj
index 4f6ef61..31723c3 100644
--- a/src/Reactor/Reactor.vcxproj
+++ b/src/Reactor/Reactor.vcxproj
@@ -298,7 +298,6 @@
<ClInclude Include="LLVMReactor.hpp" />
<ClInclude Include="LLVMReactorDebugInfo.hpp" />
<ClInclude Include="ExecutableMemory.hpp" />
- <ClInclude Include="MutexLock.hpp" />
<ClInclude Include="Nucleus.hpp" />
<ClInclude Include="Print.hpp" />
<ClInclude Include="Reactor.hpp" />
diff --git a/src/Reactor/Reactor.vcxproj.filters b/src/Reactor/Reactor.vcxproj.filters
index 22c1a6b..09796d9 100644
--- a/src/Reactor/Reactor.vcxproj.filters
+++ b/src/Reactor/Reactor.vcxproj.filters
@@ -68,9 +68,6 @@
<ClInclude Include="ExecutableMemory.hpp">
<Filter>Header Files</Filter>
</ClInclude>
- <ClInclude Include="MutexLock.hpp">
- <Filter>Header Files</Filter>
- </ClInclude>
<ClInclude Include="Thread.hpp">
<Filter>Header Files</Filter>
</ClInclude>
