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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#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"
// 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(grpc_workqueue *optional_workqueue);
//#define GRPC_COMBINER_REFCOUNT_DEBUG
#ifdef GRPC_COMBINER_REFCOUNT_DEBUG
#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,
bool covered_by_poller);
// Scheduler to execute \a action within the lock just prior to unlocking.
grpc_closure_scheduler *grpc_combiner_finally_scheduler(grpc_combiner *lock,
bool covered_by_poller);
bool grpc_combiner_continue_exec_ctx(grpc_exec_ctx *exec_ctx);
extern grpc_tracer_flag grpc_combiner_trace;
#endif /* GRPC_CORE_LIB_IOMGR_COMBINER_H */
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