2 * Copyright (c) 2013 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
20 /* A thread-safe, signal-safe, pollable doorbell.
22 * This is a thin wrapper around a pipe that allows threads to notify each
23 * other that an event has occurred in a signal-safe way */
37 void latch_init(struct latch *);
38 void latch_destroy(struct latch *);
40 bool latch_poll(struct latch *);
41 void latch_set(struct latch *);
43 bool latch_is_set(const struct latch *);
44 void latch_wait_at(const struct latch *, const char *where);
45 #define latch_wait(latch) latch_wait_at(latch, SOURCE_LOCATOR)