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| Rev | Author | Line No. | Line |
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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 | #include <test.h> |
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| 30 | #include <arch.h> |
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| 31 | #include <arch/atomic.h> |
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| 32 | #include <print.h> |
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| 33 | #include <proc/thread.h> |
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| 34 | #include <arch/types.h> |
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| 35 | #include <arch/context.h> |
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| 36 | |||
| 37 | #include <synch/waitq.h> |
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| 38 | #include <synch/rwlock.h> |
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| 39 | #include <synch/synch.h> |
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| 40 | |||
| 41 | #define READERS 50 |
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| 42 | #define WRITERS 50 |
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| 43 | |||
| 44 | static rwlock_t rwlock; |
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| 45 | |||
| 46 | static spinlock_t lock; |
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| 47 | |||
| 48 | static waitq_t can_start; |
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| 49 | |||
| 50 | __u32 seed = 0xdeadbeaf; |
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| 51 | |||
| 52 | static __u32 random(__u32 max); |
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| 53 | |||
| 54 | static void writer(void *arg); |
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| 55 | static void reader(void *arg); |
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| 56 | static void failed(void); |
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| 57 | |||
| 58 | __u32 random(__u32 max) |
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| 59 | { |
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| 60 | __u32 rc; |
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| 61 | |||
| 62 | spinlock_lock(&lock); |
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| 63 | rc = seed % max; |
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| 64 | seed = (((seed<<2) ^ (seed>>2)) * 487) + rc; |
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| 65 | spinlock_unlock(&lock); |
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| 66 | return rc; |
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| 67 | } |
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| 68 | |||
| 69 | |||
| 70 | void writer(void *arg) |
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| 71 | { |
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| 72 | int rc, to; |
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| 73 | waitq_sleep(&can_start); |
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| 74 | |||
| 75 | to = random(40000); |
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| 15 | jermar | 76 | printf("cpu%d, tid %d w+ (%d)\n", CPU->id, THREAD->tid, to); |
| 1 | jermar | 77 | rc = rwlock_write_lock_timeout(&rwlock, to); |
| 78 | if (SYNCH_FAILED(rc)) { |
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| 15 | jermar | 79 | printf("cpu%d, tid %d w!\n", CPU->id, THREAD->tid); |
| 1 | jermar | 80 | return; |
| 81 | }; |
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| 15 | jermar | 82 | printf("cpu%d, tid %d w=\n", CPU->id, THREAD->tid); |
| 1 | jermar | 83 | |
| 84 | if (rwlock.readers_in) panic("Oops."); |
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| 85 | thread_usleep(random(1000000)); |
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| 86 | if (rwlock.readers_in) panic("Oops."); |
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| 87 | |||
| 88 | rwlock_write_unlock(&rwlock); |
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| 15 | jermar | 89 | printf("cpu%d, tid %d w-\n", CPU->id, THREAD->tid); |
| 1 | jermar | 90 | } |
| 91 | |||
| 92 | void reader(void *arg) |
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| 93 | { |
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| 94 | int rc, to; |
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| 95 | waitq_sleep(&can_start); |
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| 96 | |||
| 97 | to = random(2000); |
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| 15 | jermar | 98 | printf("cpu%d, tid %d r+ (%d)\n", CPU->id, THREAD->tid, to); |
| 1 | jermar | 99 | rc = rwlock_read_lock_timeout(&rwlock, to); |
| 100 | if (SYNCH_FAILED(rc)) { |
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| 15 | jermar | 101 | printf("cpu%d, tid %d r!\n", CPU->id, THREAD->tid); |
| 1 | jermar | 102 | return; |
| 103 | } |
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| 15 | jermar | 104 | printf("cpu%d, tid %d r=\n", CPU->id, THREAD->tid); |
| 1 | jermar | 105 | thread_usleep(30000); |
| 106 | rwlock_read_unlock(&rwlock); |
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| 15 | jermar | 107 | printf("cpu%d, tid %d r-\n", CPU->id, THREAD->tid); |
| 1 | jermar | 108 | } |
| 109 | |||
| 110 | void failed(void) |
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| 111 | { |
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| 112 | printf("Test failed prematurely.\n"); |
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| 113 | thread_exit(); |
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| 114 | } |
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| 115 | |||
| 116 | void test(void) |
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| 117 | { |
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| 118 | context_t ctx; |
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| 119 | __u32 i, k; |
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| 120 | |||
| 121 | printf("Read/write locks test #4\n"); |
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| 122 | |||
| 123 | waitq_initialize(&can_start); |
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| 124 | rwlock_initialize(&rwlock); |
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| 125 | |||
| 126 | |||
| 127 | |||
| 128 | for (; ;) { |
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| 129 | thread_t *thrd; |
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| 130 | |||
| 131 | context_save(&ctx); |
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| 132 | printf("sp=%X, readers_in=%d\n", ctx.sp, rwlock.readers_in); |
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| 133 | |||
| 134 | k = random(7) + 1; |
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| 135 | printf("Creating %d readers\n", k); |
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| 136 | for (i=0; i<k; i++) { |
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| 15 | jermar | 137 | thrd = thread_create(reader, NULL, TASK, 0); |
| 1 | jermar | 138 | if (thrd) |
| 139 | thread_ready(thrd); |
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| 140 | else |
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| 141 | failed(); |
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| 142 | } |
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| 143 | |||
| 144 | k = random(5) + 1; |
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| 145 | printf("Creating %d writers\n", k); |
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| 146 | for (i=0; i<k; i++) { |
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| 15 | jermar | 147 | thrd = thread_create(writer, NULL, TASK, 0); |
| 1 | jermar | 148 | if (thrd) |
| 149 | thread_ready(thrd); |
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| 150 | else |
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| 151 | failed(); |
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| 152 | } |
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| 153 | |||
| 154 | thread_usleep(20000); |
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| 155 | waitq_wakeup(&can_start, WAKEUP_ALL); |
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| 156 | } |
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| 157 | |||
| 158 | } |