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>
#include <arch.h>
#include <typedefs.h>
 
/** Initialize condition variable.
 
 
 *
 * @param cv Condition variable.
 */
void condvar_initialize(condvar_t *cv)
{
    waitq_initialize(&cv->wq);
}
 
 
/**
 * 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
 * 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.
 
 
 *
 * @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;
    ipl_t ipl;
 
    ipl = waitq_sleep_prepare(&cv->wq);
    mutex_unlock(mtx);
   
    rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, trywait);
 
    mutex_lock(mtx);
    waitq_sleep_finish(&cv->wq, rc, ipl);
 
    return rc;
}
 

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/synch/condvar.c – Rev 1264 → 1375

Rev 1264		Rev 1375
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	/**	29	/**
30	* @file condvar.c	30	* @file condvar.c
31	* @brief Condition variables.	31	* @brief Condition variables.
32	*/	32	*/
33		33
34	#include <synch/condvar.h>	34	#include <synch/condvar.h>
35	#include <synch/mutex.h>	35	#include <synch/mutex.h>
36	#include <synch/waitq.h>	36	#include <synch/waitq.h>
37	#include <synch/synch.h>	37	#include <synch/synch.h>
-		38	#include <arch.h>
-		39	#include <typedefs.h>
38		40
39	/** Initialize condition variable	41	/** Initialize condition variable.
40	*	-
41	* Initialize condition variable.	-
42	*	42	*
43	* @param cv Condition variable.	43	* @param cv Condition variable.
44	*/	44	*/
45	void condvar_initialize(condvar_t *cv)	45	void condvar_initialize(condvar_t *cv)
46	{	46	{
47	waitq_initialize(&cv->wq);	47	waitq_initialize(&cv->wq);
48	}	48	}
49		49
50	/** Signal the condition has become true	-
51	*	50	/**
52	* Signal the condition has become true	51	* Signal the condition has become true
53	* to the first waiting thread by waking it up.	52	* to the first waiting thread by waking it up.
54	*	53	*
55	* @param cv Condition variable.	54	* @param cv Condition variable.
56	*/	55	*/
57	void condvar_signal(condvar_t *cv)	56	void condvar_signal(condvar_t *cv)
58	{	57	{
59	waitq_wakeup(&cv->wq, WAKEUP_FIRST);	58	waitq_wakeup(&cv->wq, WAKEUP_FIRST);
60	}	59	}
61		60
62	/** Signal the condition has become true	-
63	*	61	/**
64	* Signal the condition has become true	62	* Signal the condition has become true
65	* to all waiting threads by waking them up.	63	* to all waiting threads by waking them up.
66	*	64	*
67	* @param cv Condition variable.	65	* @param cv Condition variable.
68	*/	66	*/
69	void condvar_broadcast(condvar_t *cv)	67	void condvar_broadcast(condvar_t *cv)
70	{	68	{
71	waitq_wakeup(&cv->wq, WAKEUP_ALL);	69	waitq_wakeup(&cv->wq, WAKEUP_ALL);
72	}	70	}
73		71
74	/** Wait for the condition becoming true	72	/** Wait for the condition becoming true.
75	*	-
76	* Wait for the condition becoming true.	-
77	*	73	*
78	* @param cv Condition variable.	74	* @param cv Condition variable.
79	* @param mtx Mutex.	75	* @param mtx Mutex.
80	* @param usec Timeout value in microseconds.	76	* @param usec Timeout value in microseconds.
81	* @param trywait Blocking versus non-blocking operation mode switch.	77	* @param trywait Blocking versus non-blocking operation mode switch.
82	*	78	*
83	* For exact description of possible combinations of	79	* For exact description of possible combinations of
84	* usec and trywait, see comment for waitq_sleep_timeout().	80	* usec and trywait, see comment for waitq_sleep_timeout().
85	*	81	*
86	* @return See comment for waitq_sleep_timeout().	82	* @return See comment for waitq_sleep_timeout().
87	*/	83	*/
88	int _condvar_wait_timeout(condvar_t cv, mutex_t mtx, __u32 usec, int trywait)	84	int _condvar_wait_timeout(condvar_t cv, mutex_t mtx, __u32 usec, int trywait)
89	{	85	{
90	int rc;	86	int rc;
-		87	ipl_t ipl;
91		88
-		89	ipl = waitq_sleep_prepare(&cv->wq);
92	mutex_unlock(mtx);	90	mutex_unlock(mtx);
-		91
93	rc = waitq_sleep_timeout(&cv->wq, usec, trywait);	92	rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, trywait);
-		93
94	mutex_lock(mtx);	94	mutex_lock(mtx);
-		95	waitq_sleep_finish(&cv->wq, rc, ipl);
-		96
95	return rc;	97	return rc;
96	}	98	}
97		99