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https://github.com/openvswitch/ovs
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5453ae2067
In C, one can do preprocessor tricks by making a macro expansion include
the macro's own name. We actually used this in the tree to automatically
provide function arguments, e.g.:
int f(int x, const char *file, int line);
#define f(x) f(x, __FILE__, __LINE__)
...
f(1); /* Expands to a call like f(1, __FILE__, __LINE__); */
However it's somewhat confusing, so this commit stops using that trick.
Reported-by: Ed Maste <emaste@freebsd.org>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ed Maste <emaste@freebsd.org>
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/*
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* Copyright (c) 2013 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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#ifndef LATCH_H
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#define LATCH_H 1
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/* A thread-safe, signal-safe, pollable doorbell.
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*
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* This is a thin wrapper around a pipe that allows threads to notify each
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* other that an event has occurred in a signal-safe way */
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#include <stdbool.h>
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#include "util.h"
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struct latch {
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int fds[2];
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};
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void latch_init(struct latch *);
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void latch_destroy(struct latch *);
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bool latch_poll(struct latch *);
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void latch_set(struct latch *);
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bool latch_is_set(const struct latch *);
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void latch_wait_at(const struct latch *, const char *where);
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#define latch_wait(latch) latch_wait_at(latch, SOURCE_LOCATOR)
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#endif /* latch.h */
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