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/*
* Copyright (c) 2013 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef LATCH_H
#define LATCH_H 1
/* A thread-safe, signal-safe, pollable doorbell.
*
* This is a thin wrapper around a pipe that allows threads to notify each
* other that an event has occurred in a signal-safe way */
#include <stdbool.h>
#include "util.h"
struct latch {
#ifndef _WIN32
int fds[2];
#else
HANDLE wevent;
bool is_set;
#endif
};
void latch_init(struct latch *);
void latch_destroy(struct latch *);
bool latch_poll(struct latch *);
void latch_set(struct latch *);
bool latch_is_set(const struct latch *);
void latch_wait_at(const struct latch *, const char *where);
#define latch_wait(latch) latch_wait_at(latch, OVS_SOURCE_LOCATOR)
#endif /* latch.h */
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