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 *
 * Copyright 2015, Google Inc.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
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#ifndef GRPC_CORE_LIB_IOMGR_WORKQUEUE_H
#define GRPC_CORE_LIB_IOMGR_WORKQUEUE_H

#include "src/core/lib/iomgr/closure.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/iomgr/iomgr.h"
#include "src/core/lib/iomgr/pollset.h"
#include "src/core/lib/iomgr/pollset_set.h"
#include "src/core/lib/iomgr/port.h"

#ifdef GPR_WINDOWS
#include "src/core/lib/iomgr/workqueue_windows.h"
#endif

/* grpc_workqueue is forward declared in exec_ctx.h */

/* Reference counting functions. Use the macro's always
   (GRPC_WORKQUEUE_{REF,UNREF}).

   Pass in a descriptive reason string for reffing/unreffing as the last
   argument to each macro. When GRPC_WORKQUEUE_REFCOUNT_DEBUG is defined, that
   string will be printed alongside the refcount. When it is not defined, the
   string will be discarded at compilation time. */

/*#define GRPC_WORKQUEUE_REFCOUNT_DEBUG*/
#ifdef GRPC_WORKQUEUE_REFCOUNT_DEBUG
#define GRPC_WORKQUEUE_REF(p, r) \
  grpc_workqueue_ref((p), __FILE__, __LINE__, (r))
#define GRPC_WORKQUEUE_UNREF(exec_ctx, p, r) \
  grpc_workqueue_unref((exec_ctx), (p), __FILE__, __LINE__, (r))
grpc_workqueue *grpc_workqueue_ref(grpc_workqueue *workqueue, const char *file,
                                   int line, const char *reason);
void grpc_workqueue_unref(grpc_exec_ctx *exec_ctx, grpc_workqueue *workqueue,
                          const char *file, int line, const char *reason);
#else
#define GRPC_WORKQUEUE_REF(p, r) grpc_workqueue_ref((p))
#define GRPC_WORKQUEUE_UNREF(cl, p, r) grpc_workqueue_unref((cl), (p))
grpc_workqueue *grpc_workqueue_ref(grpc_workqueue *workqueue);
void grpc_workqueue_unref(grpc_exec_ctx *exec_ctx, grpc_workqueue *workqueue);
#endif

/** Add a work item to a workqueue. Items added to a work queue will be started
    in approximately the order they were enqueued, on some thread that may or
    may not be the current thread. Successive closures enqueued onto a workqueue
    MAY be executed concurrently.

    It is generally more expensive to add a closure to a workqueue than to the
    execution context, both in terms of CPU work and in execution latency.

    Use work queues when it's important that other threads be given a chance to
    tackle some workload. */
void grpc_workqueue_enqueue(grpc_exec_ctx *exec_ctx, grpc_workqueue *workqueue,
                            grpc_closure *closure, grpc_error *error);

#endif /* GRPC_CORE_LIB_IOMGR_WORKQUEUE_H */