Ben Pfaff
73 lines
3.2 KiB
C
73 lines
3.2 KiB
C
/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
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* Junior University
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*
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* We are making the OpenFlow specification and associated documentation
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* (Software) available for public use and benefit with the expectation
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* that others will use, modify and enhance the Software and contribute
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* those enhancements back to the community. However, since we would
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* like to make the Software available for broadest use, with as few
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* restrictions as possible permission is hereby granted, free of
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* charge, to any person obtaining a copy of this Software to deal in
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* the Software under the copyrights without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* The name and trademarks of copyright holder(s) may NOT be used in
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* advertising or publicity pertaining to the Software or any
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* derivatives without specific, written prior permission.
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*/
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/* High-level wrapper around the "poll" system call.
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*
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* Intended usage is for the program'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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* There is also some support for autonomous subroutines that are executed by
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* poll_block() when a file descriptor becomes ready. To prevent these
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* routines from starving if events are continuously ready, the application
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* should bound the amount of work it does between poll_block() calls. */
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#ifndef POLL_LOOP_H
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#define POLL_LOOP_H 1
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#include <poll.h>
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struct poll_waiter;
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/* Schedule events to wake up the following poll_block(). */
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struct poll_waiter *poll_fd_wait(int fd, short int events);
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void poll_timer_wait(int msec);
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void poll_immediate_wake(void);
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/* Wait until an event occurs. */
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void poll_block(void);
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/* Autonomous function callbacks. */
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typedef void poll_fd_func(int fd, short int revents, void *aux);
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struct poll_waiter *poll_fd_callback(int fd, short int events,
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poll_fd_func *, void *aux);
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/* Cancel a file descriptor callback or event. */
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void poll_cancel(struct poll_waiter *);
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#endif /* poll-loop.h */
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