source: mainline/kernel/generic/include/synch/waitq.h@ 3061bc1

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 3061bc1 was b7fd2a0, checked in by Jiří Zárevúcky <zarevucky.jiri@…>, 7 years ago

Use errno_t in all uspace and kernel code.

Change type of every variable, parameter and return value that holds an
<errno.h> constant to either errno_t (the usual case), or sys_errno_t
(some places in kernel). This is for the purpose of self-documentation,
as well as for type-checking with a bit of type definition hackery.

Although this is a massive commit, it is a simple text replacement, and thus
is very easy to verify. Simply do the following:

`
git checkout <this commit's hash>
git reset HEAD
git add .
tools/srepl '\berrno_t\b' int
git add .
tools/srepl '\bsys_errno_t\b' sysarg_t
git reset
git diff
`

While this doesn't ensure that the replacements are correct, it does ensure
that the commit doesn't do anything except those replacements. Since errno_t
is typedef'd to int in the usual case (and sys_errno_t to sysarg_t), even if
incorrect, this commit cannot change behavior.
  • Property mode set to 100644
File size: 2.8 KB
Line 
1/*
2 * Copyright (c) 2001-2004 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - 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.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup sync
30 * @{
31 */
32/** @file
33 */
34
35#ifndef KERN_WAITQ_H_
36#define KERN_WAITQ_H_
37
38#include <typedefs.h>
39#include <synch/spinlock.h>
40#include <abi/synch.h>
41#include <adt/list.h>
42
43typedef enum {
44 WAKEUP_FIRST = 0,
45 WAKEUP_ALL
46} wakeup_mode_t;
47
48/** Wait queue structure.
49 *
50 */
51typedef struct {
52 /** Lock protecting wait queue structure.
53 *
54 * Must be acquired before T.lock for each T of type thread_t.
55 */
56 IRQ_SPINLOCK_DECLARE(lock);
57
58 /**
59 * Number of waitq_wakeup() calls that didn't find a thread to wake up.
60 *
61 */
62 int missed_wakeups;
63
64 /** List of sleeping threads for which there was no missed_wakeup. */
65 list_t sleepers;
66} waitq_t;
67
68#define waitq_sleep(wq) \
69 waitq_sleep_timeout((wq), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE, NULL)
70
71struct thread;
72
73extern void waitq_initialize(waitq_t *);
74extern errno_t waitq_sleep_timeout(waitq_t *, uint32_t, unsigned int, bool *);
75extern ipl_t waitq_sleep_prepare(waitq_t *);
76extern errno_t waitq_sleep_timeout_unsafe(waitq_t *, uint32_t, unsigned int, bool *);
77extern void waitq_sleep_finish(waitq_t *, bool, ipl_t);
78extern void waitq_wakeup(waitq_t *, wakeup_mode_t);
79extern void _waitq_wakeup_unsafe(waitq_t *, wakeup_mode_t);
80extern void waitq_interrupt_sleep(struct thread *);
81extern void waitq_unsleep(waitq_t *);
82extern int waitq_count_get(waitq_t *);
83extern void waitq_count_set(waitq_t *, int val);
84
85#endif
86
87/** @}
88 */
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