2 * Copyright (c) 2014 François Tigeot
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 #ifndef _LINUX_COMPLETION_H_
27 #define _LINUX_COMPLETION_H_
29 #include <linux/wait.h>
33 wait_queue_head_t wait;
37 init_completion(struct completion *c)
40 init_waitqueue_head(&c->wait);
44 reinit_completion(struct completion *c)
49 #define INIT_COMPLETION(c) (c.done = 0)
52 * Completion interlock and wakeup. Be careful not to execute the wakeup
53 * from inside the spinlock as this can deadlock if the IPIQ fifo is full.
54 * (also note that wakeup() is asynchronous anyway, so no point doing that).
57 complete(struct completion *c)
59 lockmgr(&c->wait.lock, LK_EXCLUSIVE);
61 lockmgr(&c->wait.lock, LK_RELEASE);
66 complete_all(struct completion *c)
68 lockmgr(&c->wait.lock, LK_EXCLUSIVE);
70 lockmgr(&c->wait.lock, LK_RELEASE);
75 wait_for_completion_interruptible_timeout(struct completion *c,
76 unsigned long timeout)
78 int start_jiffies, elapsed_jiffies, remaining_jiffies;
79 bool timeout_expired = false, awakened = false;
82 start_jiffies = ticks;
84 lockmgr(&c->wait.lock, LK_EXCLUSIVE);
85 while (c->done == 0 && !timeout_expired) {
86 ret = lksleep(&c->wait, &c->wait.lock, PCATCH, "wfcit", timeout);
89 timeout_expired = true;
100 lockmgr(&c->wait.lock, LK_RELEASE);
103 elapsed_jiffies = ticks - start_jiffies;
104 remaining_jiffies = timeout - elapsed_jiffies;
105 if (remaining_jiffies > 0)
106 ret = remaining_jiffies;
112 #endif /* _LINUX_COMPLETION_H_ */