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/*
*
* Copyright 2015, 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_POLLSET_H
#define GRPC_CORE_LIB_IOMGR_POLLSET_H
#include <grpc/support/port_platform.h>
#include <grpc/support/sync.h>
#include <grpc/support/time.h>
#include "src/core/lib/iomgr/exec_ctx.h"
#define GRPC_POLLSET_KICK_BROADCAST ((grpc_pollset_worker *)1)
/* A grpc_pollset is a set of file descriptors that a higher level item is
interested in. For example:
- a server will typically keep a pollset containing all connected channels,
so that it can find new calls to service
- a completion queue might keep a pollset with an entry for each transport
that is servicing a call that it's tracking */
typedef struct grpc_pollset grpc_pollset;
typedef struct grpc_pollset_worker grpc_pollset_worker;
size_t grpc_pollset_size(void);
/* Initialize a pollset: assumes *pollset contains all zeros */
void grpc_pollset_init(grpc_pollset *pollset, gpr_mu **mu);
/* Begin shutting down the pollset, and call closure when done.
* pollset's mutex must be held */
void grpc_pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
grpc_closure *closure);
void grpc_pollset_destroy(grpc_pollset *pollset);
/* Do some work on a pollset.
May involve invoking asynchronous callbacks, or actually polling file
descriptors.
Requires pollset's mutex locked.
May unlock its mutex during its execution.
worker is a (platform-specific) handle that can be used to wake up
from grpc_pollset_work before any events are received and before the timeout
has expired. It is both initialized and destroyed by grpc_pollset_work.
Initialization of worker is guaranteed to occur BEFORE the
pollset's mutex is released for the first time by grpc_pollset_work
and it is guaranteed that it will not be released by grpc_pollset_work
AFTER worker has been destroyed.
Tries not to block past deadline.
May call grpc_closure_list_run on grpc_closure_list, without holding the
pollset
lock */
grpc_error *grpc_pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
grpc_pollset_worker **worker, gpr_timespec now,
gpr_timespec deadline) GRPC_MUST_USE_RESULT;
/* Break one polling thread out of polling work for this pollset.
If specific_worker is GRPC_POLLSET_KICK_BROADCAST, kick ALL the workers.
Otherwise, if specific_worker is non-NULL, then kick that worker. */
grpc_error *grpc_pollset_kick(grpc_pollset *pollset,
grpc_pollset_worker *specific_worker)
GRPC_MUST_USE_RESULT;
#endif /* GRPC_CORE_LIB_IOMGR_POLLSET_H */
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