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git.proxmox.com Git - ovs.git/blob - lib/latch-windows.c
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.
23 #include "poll-loop.h"
24 #include "socket-util.h"
26 /* Initializes 'latch' as initially unset. */
28 latch_init(struct latch
*latch
)
30 latch
->is_set
= FALSE
;
31 latch
->wevent
= CreateEvent(NULL
, TRUE
, FALSE
, NULL
);
34 /* Destroys 'latch'. */
36 latch_destroy(struct latch
*latch
)
38 latch
->is_set
= FALSE
;
39 CloseHandle(latch
->wevent
);
42 /* Resets 'latch' to the unset state. Returns true if 'latch' was previously
43 * set, false otherwise. */
45 latch_poll(struct latch
*latch
)
49 is_set
= latch
->is_set
;
50 latch
->is_set
= FALSE
;
51 ResetEvent(latch
->wevent
);
57 * Calls are not additive: a single latch_poll() clears out any number of
60 latch_set(struct latch
*latch
)
63 SetEvent(latch
->wevent
);
66 /* Returns true if 'latch' is set, false otherwise. Does not reset 'latch'
67 * to the unset state. */
69 latch_is_set(const struct latch
*latch
)
74 /* Causes the next poll_block() to wake up when 'latch' is set.
76 * ('where' is used in debug logging. Commonly one would use latch_wait() to
77 * automatically provide the caller's source file and line number for
80 latch_wait_at(const struct latch
*latch
, const char *where
)
82 poll_wevent_wait_at(latch
->wevent
, where
);