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/*
*
* Copyright 2015-2016, 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_IOMGR_POLLSET_POSIX_H
#define GRPC_CORE_IOMGR_POLLSET_POSIX_H
#include <poll.h>
#include <grpc/support/sync.h>
#include "src/core/iomgr/exec_ctx.h"
#include "src/core/iomgr/iomgr.h"
#include "src/core/iomgr/pollset.h"
#include "src/core/iomgr/wakeup_fd_posix.h"
typedef struct grpc_pollset_vtable grpc_pollset_vtable;
/* forward declare only in this file to avoid leaking impl details via
pollset.h; real users of grpc_fd should always include 'fd_posix.h' and not
use the struct tag */
struct grpc_fd;
typedef struct grpc_cached_wakeup_fd {
grpc_wakeup_fd fd;
struct grpc_cached_wakeup_fd *next;
} grpc_cached_wakeup_fd;
struct grpc_pollset_worker {
grpc_cached_wakeup_fd *wakeup_fd;
int reevaluate_polling_on_wakeup;
int kicked_specifically;
struct grpc_pollset_worker *next;
struct grpc_pollset_worker *prev;
};
struct grpc_pollset {
/* pollsets under posix can mutate representation as fds are added and
removed.
For example, we may choose a poll() based implementation on linux for
few fds, and an epoll() based implementation for many fds */
const grpc_pollset_vtable *vtable;
gpr_mu mu;
grpc_pollset_worker root_worker;
int in_flight_cbs;
int shutting_down;
int called_shutdown;
int kicked_without_pollers;
grpc_closure *shutdown_done;
grpc_closure_list idle_jobs;
union {
int fd;
void *ptr;
} data;
/* Local cache of eventfds for workers */
grpc_cached_wakeup_fd *local_wakeup_cache;
};
struct grpc_pollset_vtable {
void (*add_fd)(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
struct grpc_fd *fd, int and_unlock_pollset);
void (*maybe_work_and_unlock)(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
grpc_pollset_worker *worker,
gpr_timespec deadline, gpr_timespec now);
void (*finish_shutdown)(grpc_pollset *pollset);
void (*destroy)(grpc_pollset *pollset);
};
/* Add an fd to a pollset */
void grpc_pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
struct grpc_fd *fd);
/* Returns the fd to listen on for kicks */
int grpc_kick_read_fd(grpc_pollset *p);
/* Call after polling has been kicked to leave the kicked state */
void grpc_kick_drain(grpc_pollset *p);
/* Convert a timespec to milliseconds:
- very small or negative poll times are clamped to zero to do a
non-blocking poll (which becomes spin polling)
- other small values are rounded up to one millisecond
- longer than a millisecond polls are rounded up to the next nearest
millisecond to avoid spinning
- infinite timeouts are converted to -1 */
int grpc_poll_deadline_to_millis_timeout(gpr_timespec deadline,
gpr_timespec now);
/* Allow kick to wakeup the currently polling worker */
#define GRPC_POLLSET_CAN_KICK_SELF 1
/* Force the wakee to repoll when awoken */
#define GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP 2
/* As per grpc_pollset_kick, with an extended set of flags (defined above)
-- mostly for fd_posix's use. */
void grpc_pollset_kick_ext(grpc_pollset *p,
grpc_pollset_worker *specific_worker,
uint32_t flags);
/* turn a pollset into a multipoller: platform specific */
typedef void (*grpc_platform_become_multipoller_type)(grpc_exec_ctx *exec_ctx,
grpc_pollset *pollset,
struct grpc_fd **fds,
size_t fd_count);
extern grpc_platform_become_multipoller_type grpc_platform_become_multipoller;
void grpc_poll_become_multipoller(grpc_exec_ctx *exec_ctx,
grpc_pollset *pollset, struct grpc_fd **fds,
size_t fd_count);
/* Return 1 if the pollset has active threads in grpc_pollset_work (pollset must
* be locked) */
int grpc_pollset_has_workers(grpc_pollset *pollset);
void grpc_remove_fd_from_all_epoll_sets(int fd);
/* override to allow tests to hook poll() usage */
/* NOTE: Any changes to grpc_poll_function must take place when the gRPC
is certainly not doing any polling anywhere.
Otherwise, there might be a race between changing the variable and actually
doing a polling operation */
typedef int (*grpc_poll_function_type)(struct pollfd *, nfds_t, int);
extern grpc_poll_function_type grpc_poll_function;
extern grpc_wakeup_fd grpc_global_wakeup_fd;
#endif /* GRPC_CORE_IOMGR_POLLSET_POSIX_H */
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