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📄 AArch64TargetParser.cpp(8 KB)
📄 ABIBreak.cpp(811 B)
📄 AMDGPUMetadata.cpp(9.37 KB)
📄 APFloat.cpp(155.26 KB)
📄 APInt.cpp(98.08 KB)
📄 APSInt.cpp(1.44 KB)
📄 ARMAttributeParser.cpp(13.94 KB)
📄 ARMBuildAttrs.cpp(3.45 KB)
📄 ARMTargetParser.cpp(18.09 KB)
📄 ARMWinEH.cpp(1.08 KB)
📄 Allocator.cpp(1.35 KB)
📄 Atomic.cpp(1.6 KB)
📄 BinaryStreamError.cpp(1.76 KB)
📄 BinaryStreamReader.cpp(5.24 KB)
📄 BinaryStreamRef.cpp(4.76 KB)
📄 BinaryStreamWriter.cpp(3.36 KB)
📄 BlockFrequency.cpp(2.12 KB)
📄 BranchProbability.cpp(3.44 KB)
📄 BuryPointer.cpp(1.11 KB)
📄 COM.cpp(737 B)
📄 COPYRIGHT.regex(2.65 KB)
📄 CRC.cpp(5.23 KB)
📄 CachePruning.cpp(10.33 KB)
📄 Chrono.cpp(3.17 KB)
📄 CodeGenCoverage.cpp(3.61 KB)
📄 CommandLine.cpp(89.06 KB)
📄 Compression.cpp(3.84 KB)
📄 ConvertUTF.cpp(27.27 KB)
📄 ConvertUTFWrapper.cpp(8.66 KB)
📄 CrashRecoveryContext.cpp(15.45 KB)
📄 DAGDeltaAlgorithm.cpp(12.47 KB)
📄 DJB.cpp(2.71 KB)
📄 DataExtractor.cpp(7.25 KB)
📄 Debug.cpp(5.64 KB)
📄 DebugCounter.cpp(4.95 KB)
📄 DeltaAlgorithm.cpp(3.41 KB)
📄 DynamicLibrary.cpp(6.25 KB)
📄 ELFAttributeParser.cpp(7.27 KB)
📄 ELFAttributes.cpp(1.27 KB)
📄 Errno.cpp(2.18 KB)
📄 Error.cpp(4.72 KB)
📄 ErrorHandling.cpp(11.08 KB)
📄 ExtensibleRTTI.cpp(446 B)
📄 FileCheck.cpp(95.77 KB)
📄 FileCheckImpl.h(34.14 KB)
📄 FileCollector.cpp(9.01 KB)
📄 FileOutputBuffer.cpp(6.62 KB)
📄 FileUtilities.cpp(10.81 KB)
📄 FoldingSet.cpp(15.89 KB)
📄 FormatVariadic.cpp(5.17 KB)
📄 FormattedStream.cpp(5.29 KB)
📄 GlobPattern.cpp(5 KB)
📄 GraphWriter.cpp(9.21 KB)
📄 Hashing.cpp(1.16 KB)
📄 Host.cpp(51.63 KB)
📄 InitLLVM.cpp(1.92 KB)
📄 IntEqClasses.cpp(2.18 KB)
📄 IntervalMap.cpp(4.4 KB)
📄 ItaniumManglingCanonicalizer.cpp(10.77 KB)
📄 JSON.cpp(19.1 KB)
📄 KnownBits.cpp(3.78 KB)
📄 LEB128.cpp(1.19 KB)
📄 LineIterator.cpp(2.61 KB)
📄 Locale.cpp(377 B)
📄 LockFileManager.cpp(10.64 KB)
📄 LowLevelType.cpp(2.09 KB)
📄 MD5.cpp(8.99 KB)
📄 ManagedStatic.cpp(2.37 KB)
📄 MathExtras.cpp(913 B)
📄 MemAlloc.cpp(1.01 KB)
📄 Memory.cpp(1.57 KB)
📄 MemoryBuffer.cpp(18.99 KB)
📄 NativeFormatting.cpp(7.54 KB)
📄 OptimizedStructLayout.cpp(16.7 KB)
📄 Optional.cpp(530 B)
📄 Parallel.cpp(5.08 KB)
📄 Path.cpp(36.52 KB)
📄 PluginLoader.cpp(1.63 KB)
📄 PrettyStackTrace.cpp(10.33 KB)
📄 Process.cpp(3.27 KB)
📄 Program.cpp(3.54 KB)
📄 RISCVAttributeParser.cpp(2.06 KB)
📄 RISCVAttributes.cpp(970 B)
📄 RWMutex.cpp(3.23 KB)
📄 RandomNumberGenerator.cpp(2.86 KB)
📄 Regex.cpp(6.38 KB)
📄 SHA1.cpp(10.43 KB)
📄 ScaledNumber.cpp(9.09 KB)
📄 ScopedPrinter.cpp(1.19 KB)
📄 Signals.cpp(8.35 KB)
📄 Signposts.cpp(3.24 KB)
📄 SmallPtrSet.cpp(9.21 KB)
📄 SmallVector.cpp(3.99 KB)
📄 SourceMgr.cpp(20.08 KB)
📄 SpecialCaseList.cpp(7.48 KB)
📄 Statistic.cpp(8.85 KB)
📄 StringExtras.cpp(4.34 KB)
📄 StringMap.cpp(9.31 KB)
📄 StringRef.cpp(17.41 KB)
📄 StringSaver.cpp(882 B)
📄 SuffixTree.cpp(7.23 KB)
📄 SymbolRemappingReader.cpp(2.94 KB)
📄 SystemUtils.cpp(1.06 KB)
📄 TarWriter.cpp(7.23 KB)
📄 TargetParser.cpp(9.86 KB)
📄 TargetRegistry.cpp(4.6 KB)
📄 ThreadLocal.cpp(1.68 KB)
📄 ThreadPool.cpp(4.4 KB)
📄 Threading.cpp(4.55 KB)
📄 TimeProfiler.cpp(11.63 KB)
📄 Timer.cpp(14.14 KB)
📄 ToolOutputFile.cpp(1.83 KB)
📄 TrigramIndex.cpp(3.24 KB)
📄 Triple.cpp(53.17 KB)
📄 Twine.cpp(4.6 KB)
📄 Unicode.cpp(20.14 KB)
📄 UnicodeCaseFold.cpp(15.32 KB)
📁 Unix
📄 Valgrind.cpp(1.6 KB)
📄 VersionTuple.cpp(2.74 KB)
📄 VirtualFileSystem.cpp(74.17 KB)
📄 Watchdog.cpp(738 B)
📁 Windows
📄 WithColor.cpp(4.35 KB)
📄 X86TargetParser.cpp(27.21 KB)
📄 YAMLParser.cpp(68.53 KB)
📄 YAMLTraits.cpp(28.37 KB)
📄 Z3Solver.cpp(31.44 KB)
📄 circular_raw_ostream.cpp(1.3 KB)
📄 raw_os_ostream.cpp(995 B)
📄 raw_ostream.cpp(28.97 KB)
📄 regcomp.c(39.42 KB)
📄 regengine.inc(26.49 KB)
📄 regerror.c(4.42 KB)
📄 regex2.h(6.82 KB)
📄 regex_impl.h(3.63 KB)
📄 regexec.c(5.71 KB)
📄 regfree.c(2.49 KB)
📄 regstrlcpy.c(1.56 KB)
📄 regutils.h(2.25 KB)
📄 xxhash.cpp(4.07 KB)

Editing: Parallel.cpp

//===- llvm/Support/Parallel.cpp - Parallel algorithms --------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "llvm/Support/Parallel.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Threading.h"

#include <atomic>
#include <future>
#include <stack>
#include <thread>
#include <vector>

llvm::ThreadPoolStrategy llvm::parallel::strategy;

#if LLVM_ENABLE_THREADS

namespace llvm {
namespace parallel {
namespace detail {

namespace {

/// An abstract class that takes closures and runs them asynchronously.
class Executor {
public:
  virtual ~Executor() = default;
  virtual void add(std::function<void()> func) = 0;

static Executor *getDefaultExecutor();
};

/// An implementation of an Executor that runs closures on a thread pool
///   in filo order.
class ThreadPoolExecutor : public Executor {
public:
  explicit ThreadPoolExecutor(ThreadPoolStrategy S = hardware_concurrency()) {
    unsigned ThreadCount = S.compute_thread_count();
    // Spawn all but one of the threads in another thread as spawning threads
    // can take a while.
    Threads.reserve(ThreadCount);
    Threads.resize(1);
    std::lock_guard<std::mutex> Lock(Mutex);
    Threads[0] = std::thread([this, ThreadCount, S] {
      for (unsigned I = 1; I < ThreadCount; ++I) {
        Threads.emplace_back([=] { work(S, I); });
        if (Stop)
          break;
      }
      ThreadsCreated.set_value();
      work(S, 0);
    });
  }

void stop() {
    {
      std::lock_guard<std::mutex> Lock(Mutex);
      if (Stop)
        return;
      Stop = true;
    }
    Cond.notify_all();
    ThreadsCreated.get_future().wait();
  }

~ThreadPoolExecutor() override {
    stop();
    std::thread::id CurrentThreadId = std::this_thread::get_id();
    for (std::thread &T : Threads)
      if (T.get_id() == CurrentThreadId)
        T.detach();
      else
        T.join();
  }

struct Creator {
    static void *call() { return new ThreadPoolExecutor(strategy); }
  };
  struct Deleter {
    static void call(void *Ptr) { ((ThreadPoolExecutor *)Ptr)->stop(); }
  };

void add(std::function<void()> F) override {
    {
      std::lock_guard<std::mutex> Lock(Mutex);
      WorkStack.push(F);
    }
    Cond.notify_one();
  }

private:
  void work(ThreadPoolStrategy S, unsigned ThreadID) {
    S.apply_thread_strategy(ThreadID);
    while (true) {
      std::unique_lock<std::mutex> Lock(Mutex);
      Cond.wait(Lock, [&] { return Stop || !WorkStack.empty(); });
      if (Stop)
        break;
      auto Task = WorkStack.top();
      WorkStack.pop();
      Lock.unlock();
      Task();
    }
  }

std::atomic<bool> Stop{false};
  std::stack<std::function<void()>> WorkStack;
  std::mutex Mutex;
  std::condition_variable Cond;
  std::promise<void> ThreadsCreated;
  std::vector<std::thread> Threads;
};

Executor *Executor::getDefaultExecutor() {
  // The ManagedStatic enables the ThreadPoolExecutor to be stopped via
  // llvm_shutdown() which allows a "clean" fast exit, e.g. via _exit(). This
  // stops the thread pool and waits for any worker thread creation to complete
  // but does not wait for the threads to finish. The wait for worker thread
  // creation to complete is important as it prevents intermittent crashes on
  // Windows due to a race condition between thread creation and process exit.
  //
  // The ThreadPoolExecutor will only be destroyed when the static unique_ptr to
  // it is destroyed, i.e. in a normal full exit. The ThreadPoolExecutor
  // destructor ensures it has been stopped and waits for worker threads to
  // finish. The wait is important as it prevents intermittent crashes on
  // Windows when the process is doing a full exit.
  //
  // The Windows crashes appear to only occur with the MSVC static runtimes and
  // are more frequent with the debug static runtime.
  //
  // This also prevents intermittent deadlocks on exit with the MinGW runtime.

static ManagedStatic<ThreadPoolExecutor, ThreadPoolExecutor::Creator,
                       ThreadPoolExecutor::Deleter>
      ManagedExec;
  static std::unique_ptr<ThreadPoolExecutor> Exec(&(*ManagedExec));
  return Exec.get();
}
} // namespace

static std::atomic<int> TaskGroupInstances;

// Latch::sync() called by the dtor may cause one thread to block. If is a dead
// lock if all threads in the default executor are blocked. To prevent the dead
// lock, only allow the first TaskGroup to run tasks parallelly. In the scenario
// of nested parallel_for_each(), only the outermost one runs parallelly.
TaskGroup::TaskGroup() : Parallel(TaskGroupInstances++ == 0) {}
TaskGroup::~TaskGroup() { --TaskGroupInstances; }

void TaskGroup::spawn(std::function<void()> F) {
  if (Parallel) {
    L.inc();
    Executor::getDefaultExecutor()->add([&, F] {
      F();
      L.dec();
    });
  } else {
    F();
  }
}

} // namespace detail
} // namespace parallel
} // namespace llvm
#endif // LLVM_ENABLE_THREADS

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Editing: Parallel.cpp

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