text: /*
   *
   * Copyright 2019 gRPC authors.
   *
   * 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.
   *
   */
  
  #include <grpc/support/port_platform.h>
  
  #include <functional>
  
  #include "src/core/lib/debug/trace.h"
  #include "src/core/lib/gprpp/atomic.h"
  #include "src/core/lib/gprpp/debug_location.h"
  #include "src/core/lib/gprpp/mpscq.h"
  #include "src/core/lib/gprpp/orphanable.h"
  #include "src/core/lib/gprpp/ref_counted.h"
  #include "src/core/lib/iomgr/exec_ctx.h"
  
  #ifndef GRPC_CORE_LIB_IOMGR_WORK_SERIALIZER_H
  #define GRPC_CORE_LIB_IOMGR_WORK_SERIALIZER_H
  
  namespace grpc_core {
  
  // WorkSerializer is a mechanism to schedule callbacks in a synchronized manner.
  // All callbacks scheduled on a WorkSerializer instance will be executed
  // serially in a borrowed thread. The API provides a FIFO guarantee to the
  // execution of callbacks scheduled on the thread.
  // When a thread calls Run() with a callback, the thread is considered borrowed.
  // The callback might run inline, or it might run asynchronously in a different
  // thread that is already inside of Run(). If the callback runs directly inline,
  // other callbacks from other threads might also be executed before Run()
  // returns. Since an arbitrary set of callbacks might be executed when Run() is
  // called, generally no locks should be held while calling Run().
  class WorkSerializer {
   public:
    WorkSerializer();
  
    ~WorkSerializer();
  
    // TODO(yashkt): Replace grpc_core::DebugLocation with absl::SourceLocation
    // once we can start using it directly.
    void Run(std::function<void()> callback,
             const grpc_core::DebugLocation& location);
  
   private:
    class WorkSerializerImpl;
  
    OrphanablePtr<WorkSerializerImpl> impl_;
  };
  
  } /* namespace grpc_core */
  
  #endif /* GRPC_CORE_LIB_IOMGR_WORK_SERIALIZER_H */
  