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Poll-loop is the core to implement main loop. It should be available in libopenvswitch. Signed-off-by: Xiao Liang <shaw.leon@gmail.com> Signed-off-by: Ben Pfaff <blp@ovn.org>
84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011, 2013, 2017 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* High-level wrapper around the "poll" system call.
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*
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* The intended usage is for each thread's main loop to go about its business
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* servicing whatever events it needs to. Then, when it runs out of immediate
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* tasks, it calls each subordinate module's "wait" function, which in turn
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* calls one (or more) of the functions poll_fd_wait(), poll_immediate_wake(),
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* and poll_timer_wait() to register to be awakened when the appropriate event
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* occurs. Then the main loop calls poll_block(), which blocks until one of
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* the registered events happens.
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*
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*
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* Thread-safety
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* =============
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*
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* The poll set is per-thread, so all functions in this module are thread-safe.
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*/
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#ifndef POLL_LOOP_H
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#define POLL_LOOP_H 1
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#ifndef _WIN32
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#include <poll.h>
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#endif
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Schedule events to wake up the following poll_block().
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*
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* The poll_loop logs the 'where' argument to each function at "debug" level
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* when an event causes a wakeup. Each of these ways to schedule an event has
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* a function and a macro wrapper. The macro version automatically supplies
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* the source code location of the caller. The function version allows the
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* caller to supply a location explicitly, which is useful if the caller's own
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* caller would be more useful in log output. See timer_wait_at() for an
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* example. */
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void poll_fd_wait_at(int fd, short int events, const char *where);
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#define poll_fd_wait(fd, events) poll_fd_wait_at(fd, events, OVS_SOURCE_LOCATOR)
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#ifdef _WIN32
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void poll_wevent_wait_at(HANDLE wevent, const char *where);
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#define poll_wevent_wait(wevent) poll_wevent_wait_at(wevent, OVS_SOURCE_LOCATOR)
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#endif /* _WIN32 */
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void poll_timer_wait_at(long long int msec, const char *where);
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#define poll_timer_wait(msec) poll_timer_wait_at(msec, OVS_SOURCE_LOCATOR)
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void poll_timer_wait_until_at(long long int msec, const char *where);
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#define poll_timer_wait_until(msec) \
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poll_timer_wait_until_at(msec, OVS_SOURCE_LOCATOR)
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void poll_immediate_wake_at(const char *where);
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#define poll_immediate_wake() poll_immediate_wake_at(OVS_SOURCE_LOCATOR)
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/* Wait until an event occurs. */
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void poll_block(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* poll-loop.h */
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