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-rw-r--r--src/core/lib/iomgr/pollset_posix.h153
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diff --git a/src/core/lib/iomgr/pollset_posix.h b/src/core/lib/iomgr/pollset_posix.h
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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_POSIX_H
-#define GRPC_CORE_LIB_IOMGR_POLLSET_POSIX_H
-
-#include <poll.h>
-
-#include <grpc/support/sync.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/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_LIB_IOMGR_POLLSET_POSIX_H */