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d474bd01bb
The last user of this feature has been removed, so delete the feature too, simplifying poll-loop.c significantly. poll_cancel() is no longer used, either, but deleting it is much less beneficial.
51 lines
1.9 KiB
C
51 lines
1.9 KiB
C
/*
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* Copyright (c) 2008, 2009 Nicira Networks.
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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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* 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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/* 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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