chromium/third_party/grpc/src/src/core/lib/iomgr/call_combiner.h

//
//
// Copyright 2017 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.
//
//

#ifndef GRPC_SRC_CORE_LIB_IOMGR_CALL_COMBINER_H
#define GRPC_SRC_CORE_LIB_IOMGR_CALL_COMBINER_H

#include <grpc/support/port_platform.h>

#include <stddef.h>

#include "absl/container/inlined_vector.h"

#include <grpc/support/atm.h>

#include "src/core/lib/gprpp/mpscq.h"
#include "src/core/lib/gprpp/ref_counted.h"
#include "src/core/lib/gprpp/ref_counted_ptr.h"
#include "src/core/lib/iomgr/closure.h"
#include "src/core/lib/iomgr/dynamic_annotations.h"
#include "src/core/lib/iomgr/exec_ctx.h"

// A simple, lock-free mechanism for serializing activity related to a
// single call.  This is similar to a combiner but is more lightweight.
//
// It requires the callback (or, in the common case where the callback
// actually kicks off a chain of callbacks, the last callback in that
// chain) to explicitly indicate (by calling GRPC_CALL_COMBINER_STOP())
// when it is done with the action that was kicked off by the original
// callback.

namespace grpc_core {

extern DebugOnlyTraceFlag grpc_call_combiner_trace;

class CallCombiner { … };

// Helper for running a list of closures in a call combiner.
//
// Each callback running in the call combiner will eventually be
// returned to the surface, at which point the surface will yield the
// call combiner.  So when we are running in the call combiner and have
// more than one callback to return to the surface, we need to re-enter
// the call combiner for all but one of those callbacks.
class CallCombinerClosureList { … };

}  // namespace grpc_core

#endif  // GRPC_SRC_CORE_LIB_IOMGR_CALL_COMBINER_H