WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/synch/condvar.c


/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/**
 * @file    condvar.c
 * @brief   Condition variables.
 */
 
#include <synch/condvar.h>
#include <synch/mutex.h>
#include <synch/waitq.h>
#include <synch/synch.h>
 
/** Initialize condition variable
 *
 * Initialize condition variable.
 *
 * @param cv Condition variable.
 */
void condvar_initialize(condvar_t *cv)
{
    waitq_initialize(&cv->wq);
}
 
/** Signal the condition has become true
 *
 * Signal the condition has become true
 * to the first waiting thread by waking it up.
 *
 * @param cv Condition variable.
 */
void condvar_signal(condvar_t *cv)
{
    waitq_wakeup(&cv->wq, WAKEUP_FIRST);
}
 
/** Signal the condition has become true
 *
 * Signal the condition has become true
 * to all waiting threads by waking them up.
 *
 * @param cv Condition variable.
 */
void condvar_broadcast(condvar_t *cv)
{
    waitq_wakeup(&cv->wq, WAKEUP_ALL);
}
 
/** Wait for the condition becoming true
 *
 * Wait for the condition becoming true.
 *
 * @param cv Condition variable.
 * @param mtx Mutex.
 * @param usec Timeout value in microseconds.
 * @param trywait Blocking versus non-blocking operation mode switch.
 *
 * For exact description of possible combinations of
 * usec and trywait, see comment for waitq_sleep_timeout().
 *
 * @return See comment for waitq_sleep_timeout().
 */
int _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, __u32 usec, int trywait)
{
    int rc;
 
    mutex_unlock(mtx);
    rc = waitq_sleep_timeout(&cv->wq, usec, trywait);
    mutex_lock(mtx);
    return rc;
}
 

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/synch/condvar.c @ 1757 – Rev 1248 → 1264

Rev 1248		Rev 1264
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	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	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.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
-		29	/**
-		30	* @file condvar.c
-		31	* @brief Condition variables.
-		32	*/
-		33
29	#include <synch/condvar.h>	34	#include <synch/condvar.h>
30	#include <synch/mutex.h>	35	#include <synch/mutex.h>
31	#include <synch/waitq.h>	36	#include <synch/waitq.h>
32	#include <synch/synch.h>	37	#include <synch/synch.h>
33		38
34	/** Initialize condition variable	39	/** Initialize condition variable
35	*	40	*
36	* Initialize condition variable.	41	* Initialize condition variable.
37	*	42	*
38	* @param cv Condition variable.	43	* @param cv Condition variable.
39	*/	44	*/
40	void condvar_initialize(condvar_t *cv)	45	void condvar_initialize(condvar_t *cv)
41	{	46	{
42	waitq_initialize(&cv->wq);	47	waitq_initialize(&cv->wq);
43	}	48	}
44		49
45	/** Signal the condition has become true	50	/** Signal the condition has become true
46	*	51	*
47	* Signal the condition has become true	52	* Signal the condition has become true
48	* to the first waiting thread by waking it up.	53	* to the first waiting thread by waking it up.
49	*	54	*
50	* @param cv Condition variable.	55	* @param cv Condition variable.
51	*/	56	*/
52	void condvar_signal(condvar_t *cv)	57	void condvar_signal(condvar_t *cv)
53	{	58	{
54	waitq_wakeup(&cv->wq, WAKEUP_FIRST);	59	waitq_wakeup(&cv->wq, WAKEUP_FIRST);
55	}	60	}
56		61
57	/** Signal the condition has become true	62	/** Signal the condition has become true
58	*	63	*
59	* Signal the condition has become true	64	* Signal the condition has become true
60	* to all waiting threads by waking them up.	65	* to all waiting threads by waking them up.
61	*	66	*
62	* @param cv Condition variable.	67	* @param cv Condition variable.
63	*/	68	*/
64	void condvar_broadcast(condvar_t *cv)	69	void condvar_broadcast(condvar_t *cv)
65	{	70	{
66	waitq_wakeup(&cv->wq, WAKEUP_ALL);	71	waitq_wakeup(&cv->wq, WAKEUP_ALL);
67	}	72	}
68		73
69	/** Wait for the condition becoming true	74	/** Wait for the condition becoming true
70	*	75	*
71	* Wait for the condition becoming true.	76	* Wait for the condition becoming true.
72	*	77	*
73	* @param cv Condition variable.	78	* @param cv Condition variable.
74	* @param mtx Mutex.	79	* @param mtx Mutex.
75	* @param usec Timeout value in microseconds.	80	* @param usec Timeout value in microseconds.
76	* @param trywait Blocking versus non-blocking operation mode switch.	81	* @param trywait Blocking versus non-blocking operation mode switch.
77	*	82	*
78	* For exact description of possible combinations of	83	* For exact description of possible combinations of
79	* usec and trywait, see comment for waitq_sleep_timeout().	84	* usec and trywait, see comment for waitq_sleep_timeout().
80	*	85	*
81	* @return See comment for waitq_sleep_timeout().	86	* @return See comment for waitq_sleep_timeout().
82	*/	87	*/
83	int _condvar_wait_timeout(condvar_t cv, mutex_t mtx, __u32 usec, int trywait)	88	int _condvar_wait_timeout(condvar_t cv, mutex_t mtx, __u32 usec, int trywait)
84	{	89	{
85	int rc;	90	int rc;
86		91
87	mutex_unlock(mtx);	92	mutex_unlock(mtx);
88	rc = waitq_sleep_timeout(&cv->wq, usec, trywait);	93	rc = waitq_sleep_timeout(&cv->wq, usec, trywait);
89	mutex_lock(mtx);	94	mutex_lock(mtx);
90	return rc;	95	return rc;
91	}	96	}
92		97