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| 1 | jermar | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2001-2004 Jakub Jermar |
| 1 | jermar | 3 | * All rights reserved. |
| 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 | |||
| 1888 | jermar | 29 | /** @addtogroup sync |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 1888 | jermar | 35 | #ifndef KERN_RWLOCK_H_ |
| 36 | #define KERN_RWLOCK_H_ |
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| 1 | jermar | 37 | |
| 38 | #include <arch/types.h> |
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| 39 | #include <synch/mutex.h> |
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| 40 | #include <synch/synch.h> |
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| 623 | jermar | 41 | #include <synch/spinlock.h> |
| 1 | jermar | 42 | |
| 2085 | decky | 43 | typedef enum { |
| 1 | jermar | 44 | RWLOCK_NONE, |
| 45 | RWLOCK_READER, |
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| 46 | RWLOCK_WRITER |
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| 2085 | decky | 47 | } rwlock_type_t; |
| 1 | jermar | 48 | |
| 2085 | decky | 49 | typedef struct { |
| 623 | jermar | 50 | SPINLOCK_DECLARE(lock); |
| 2106 | jermar | 51 | /** |
| 52 | * Mutex for writers, readers can bypass it if readers_in is positive. |
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| 53 | */ |
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| 54 | mutex_t exclusive; |
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| 55 | /** Number of readers in critical section. */ |
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| 4692 | svoboda | 56 | size_t readers_in; |
| 2085 | decky | 57 | } rwlock_t; |
| 1 | jermar | 58 | |
| 59 | #define rwlock_write_lock(rwl) \ |
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| 2106 | jermar | 60 | _rwlock_write_lock_timeout((rwl), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE) |
| 1 | jermar | 61 | #define rwlock_read_lock(rwl) \ |
| 2106 | jermar | 62 | _rwlock_read_lock_timeout((rwl), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE) |
| 1 | jermar | 63 | #define rwlock_write_trylock(rwl) \ |
| 2106 | jermar | 64 | _rwlock_write_lock_timeout((rwl), SYNCH_NO_TIMEOUT, \ |
| 65 | SYNCH_FLAGS_NON_BLOCKING) |
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| 1 | jermar | 66 | #define rwlock_read_trylock(rwl) \ |
| 2106 | jermar | 67 | _rwlock_read_lock_timeout((rwl), SYNCH_NO_TIMEOUT, \ |
| 68 | SYNCH_FLAGS_NON_BLOCKING) |
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| 69 | #define rwlock_write_lock_timeout(rwl, usec) \ |
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| 70 | _rwlock_write_lock_timeout((rwl), (usec), SYNCH_FLAGS_NONE) |
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| 71 | #define rwlock_read_lock_timeout(rwl, usec) \ |
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| 72 | _rwlock_read_lock_timeout((rwl), (usec), SYNCH_FLAGS_NONE) |
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| 1 | jermar | 73 | |
| 74 | extern void rwlock_initialize(rwlock_t *rwl); |
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| 75 | extern void rwlock_read_unlock(rwlock_t *rwl); |
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| 76 | extern void rwlock_write_unlock(rwlock_t *rwl); |
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| 1780 | jermar | 77 | extern int _rwlock_read_lock_timeout(rwlock_t *rwl, uint32_t usec, int flags); |
| 78 | extern int _rwlock_write_lock_timeout(rwlock_t *rwl, uint32_t usec, int flags); |
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| 1 | jermar | 79 | |
| 80 | #endif |
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| 1502 | jermar | 81 | |
| 1888 | jermar | 82 | /** @} |
| 1702 | cejka | 83 | */ |