waitq.h

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00001 /*
00002  * Copyright (C) 2001-2004 Jakub Jermar
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  *
00009  * - Redistributions of source code must retain the above copyright
00010  *   notice, this list of conditions and the following disclaimer.
00011  * - Redistributions in binary form must reproduce the above copyright
00012  *   notice, this list of conditions and the following disclaimer in the
00013  *   documentation and/or other materials provided with the distribution.
00014  * - The name of the author may not be used to endorse or promote products
00015  *   derived from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00018  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00019  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
00020  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
00021  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
00022  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00023  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00024  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00025  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
00026  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027  */
00028 
00035 #ifndef __WAITQ_H__
00036 #define __WAITQ_H__
00037 
00038 #include <arch/types.h>
00039 #include <typedefs.h>
00040 #include <synch/spinlock.h>
00041 #include <synch/synch.h>
00042 #include <adt/list.h>
00043 
00044 #define WAKEUP_FIRST    0
00045 #define WAKEUP_ALL      1
00046 
00048 struct waitq {
00049 
00054         SPINLOCK_DECLARE(lock);
00055 
00056         int missed_wakeups;     
00057         link_t head;            
00058 };
00059 
00060 #define waitq_sleep(wq) \
00061         waitq_sleep_timeout((wq),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NONE)
00062 
00063 extern void waitq_initialize(waitq_t *wq);
00064 extern int waitq_sleep_timeout(waitq_t *wq, __u32 usec, int flags);
00065 extern ipl_t waitq_sleep_prepare(waitq_t *wq);
00066 extern int waitq_sleep_timeout_unsafe(waitq_t *wq, __u32 usec, int flags);
00067 extern void waitq_sleep_finish(waitq_t *wq, int rc, ipl_t ipl);
00068 extern void waitq_wakeup(waitq_t *wq, bool all);
00069 extern void _waitq_wakeup_unsafe(waitq_t *wq, bool all);
00070 extern void waitq_interrupt_sleep(thread_t *t);
00071 
00072 #endif
00073 

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