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/*
*
* Copyright 2016 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_CORE_LIB_IOMGR_COMBINER_H
#define GRPC_CORE_LIB_IOMGR_COMBINER_H
#include <stddef.h>
#include <grpc/support/atm.h>
#include "src/core/lib/debug/trace.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/support/mpscq.h"
#ifdef __cplusplus
extern "C" {
#endif
// Provides serialized access to some resource.
// Each action queued on a combiner is executed serially in a borrowed thread.
// The actual thread executing actions may change over time (but there will only
// every be one at a time).
// Initialize the lock, with an optional workqueue to shift load to when
// necessary
grpc_combiner *grpc_combiner_create(void);
#ifndef NDEBUG
#define GRPC_COMBINER_DEBUG_ARGS \
, const char *file, int line, const char *reason
#define GRPC_COMBINER_REF(combiner, reason) \
grpc_combiner_ref((combiner), __FILE__, __LINE__, (reason))
#define GRPC_COMBINER_UNREF(exec_ctx, combiner, reason) \
grpc_combiner_unref((exec_ctx), (combiner), __FILE__, __LINE__, (reason))
#else
#define GRPC_COMBINER_DEBUG_ARGS
#define GRPC_COMBINER_REF(combiner, reason) grpc_combiner_ref((combiner))
#define GRPC_COMBINER_UNREF(exec_ctx, combiner, reason) \
grpc_combiner_unref((exec_ctx), (combiner))
#endif
// Ref/unref the lock, for when we're sharing the lock ownership
// Prefer to use the macros above
grpc_combiner *grpc_combiner_ref(grpc_combiner *lock GRPC_COMBINER_DEBUG_ARGS);
void grpc_combiner_unref(grpc_exec_ctx *exec_ctx,
grpc_combiner *lock GRPC_COMBINER_DEBUG_ARGS);
// Fetch a scheduler to schedule closures against
grpc_closure_scheduler *grpc_combiner_scheduler(grpc_combiner *lock);
// Scheduler to execute \a action within the lock just prior to unlocking.
grpc_closure_scheduler *grpc_combiner_finally_scheduler(grpc_combiner *lock);
bool grpc_combiner_continue_exec_ctx(grpc_exec_ctx *exec_ctx);
extern grpc_tracer_flag grpc_combiner_trace;
#ifdef __cplusplus
}
#endif
#endif /* GRPC_CORE_LIB_IOMGR_COMBINER_H */
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