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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #ifndef __WAITQ_H__ |
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| 30 | #define __WAITQ_H__ |
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| 31 | |||
| 32 | #include <arch/types.h> |
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| 33 | #include <typedefs.h> |
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| 34 | #include <synch/spinlock.h> |
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| 35 | #include <synch/synch.h> |
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| 788 | jermar | 36 | #include <adt/list.h> |
| 1 | jermar | 37 | |
| 38 | #define WAKEUP_FIRST 0 |
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| 39 | #define WAKEUP_ALL 1 |
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| 40 | |||
| 557 | jermar | 41 | /** Wait queue structure. */ |
| 1 | jermar | 42 | struct waitq { |
| 557 | jermar | 43 | |
| 44 | /** Lock protecting wait queue structure. |
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| 45 | * |
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| 46 | * Must be acquired before T.lock for each T of type thread_t. |
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| 47 | */ |
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| 623 | jermar | 48 | SPINLOCK_DECLARE(lock); |
| 557 | jermar | 49 | |
| 410 | jermar | 50 | int missed_wakeups; /**< Number of waitq_wakeup() calls that didn't find a thread to wake up. */ |
| 51 | link_t head; /**< List of sleeping threads for wich there was no missed_wakeup. */ |
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| 1 | jermar | 52 | }; |
| 53 | |||
| 54 | #define waitq_sleep(wq) \ |
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| 55 | waitq_sleep_timeout((wq),SYNCH_NO_TIMEOUT,SYNCH_BLOCKING) |
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| 56 | |||
| 57 | extern void waitq_initialize(waitq_t *wq); |
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| 58 | extern int waitq_sleep_timeout(waitq_t *wq, __u32 usec, int nonblocking); |
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| 1375 | jermar | 59 | extern ipl_t waitq_sleep_prepare(waitq_t *wq); |
| 60 | extern int waitq_sleep_timeout_unsafe(waitq_t *wq, __u32 usec, int nonblocking); |
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| 61 | extern void waitq_sleep_finish(waitq_t *wq, int rc, ipl_t ipl); |
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| 557 | jermar | 62 | extern void waitq_wakeup(waitq_t *wq, bool all); |
| 63 | extern void _waitq_wakeup_unsafe(waitq_t *wq, bool all); |
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| 1156 | jermar | 64 | extern void waitq_interrupt_sleep(thread_t *t); |
| 1 | jermar | 65 | |
| 66 | #endif |