kc3-lang/angle/src/libANGLE/WorkerThread.h

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• Hash : 7ae70d8f
  Author :
  Date : 2018-07-06T13:47:01
  

  ParallelCompile: Parallelize D3D linking
  
  This adds a new linking state to Program. If a Program is in linking
  state, on the one hand the foreground thread may continue issuing more
  GL calls, and on the other hand the background linking threads may be
  accessing Program internally too. Without a proper constraint there
  must be conflicts between them. For this purpose, we block any further
  GL calls to Program until it's actually linked. In addition, we
  prohibit parallel linking an active program, so that ProgramD3D does
  not have to worry about such similar conflicts.
  
  Also changes the WorkerThread to support limiting the number of
  concurrently running worker threads.
  
  BUG=chromium:849576
  
  Change-Id: I52618647539323f8bf27201320bdf7301c4982e6
  Reviewed-on: https://chromium-review.googlesource.com/1127495
  Commit-Queue: Jie A Chen <jie.a.chen@intel.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/WorkerThread.h

• //
  // Copyright 2016 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // WorkerThread:
  //   Asychronous tasks/threads for ANGLE, similar to a TaskRunner in Chromium.
  //   Can be implemented as different targets, depending on platform.
  //
  
  #ifndef LIBANGLE_WORKER_THREAD_H_
  #define LIBANGLE_WORKER_THREAD_H_
  
  #include <array>
  #include <memory>
  #include <vector>
  
  #include "common/debug.h"
  #include "libANGLE/features.h"
  
  namespace angle
  {
  
  // A callback function with no return value and no arguments.
  class Closure
  {
    public:
      virtual ~Closure()        = default;
      virtual void operator()() = 0;
  };
  
  // An event that we can wait on, useful for joining worker threads.
  class WaitableEvent : angle::NonCopyable
  {
    public:
      WaitableEvent();
      virtual ~WaitableEvent();
  
      // Waits indefinitely for the event to be signaled.
      virtual void wait() = 0;
  
      // Peeks whether the event is ready. If ready, wait() will not block.
      virtual bool isReady() = 0;
  
      template <size_t Count>
      static void WaitMany(std::array<std::shared_ptr<WaitableEvent>, Count> *waitables)
      {
          ASSERT(Count > 0);
          for (size_t index = 0; index < Count; ++index)
          {
              (*waitables)[index]->wait();
          }
      }
  };
  
  // Request WorkerThreads from the WorkerThreadPool. Each pool can keep worker threads around so
  // we avoid the costly spin up and spin down time.
  class WorkerThreadPool : angle::NonCopyable
  {
    public:
      WorkerThreadPool();
      virtual ~WorkerThreadPool();
  
      static std::shared_ptr<WorkerThreadPool> Create(bool multithreaded);
  
      // Returns an event to wait on for the task to finish.
      // If the pool fails to create the task, returns null.
      virtual std::shared_ptr<WaitableEvent> postWorkerTask(std::shared_ptr<Closure> task) = 0;
  
      virtual void setMaxThreads(size_t maxThreads) = 0;
  };
  
  }  // namespace angle
  
  #endif  // LIBANGLE_WORKER_THREAD_H_
  

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