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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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| 1104 | jermar | 31 | #include <atomic.h> |
| 1 | jermar | 32 | #include <print.h> |
| 33 | #include <proc/thread.h> |
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| 34 | |||
| 35 | #include <synch/waitq.h> |
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| 36 | #include <synch/rwlock.h> |
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| 37 | |||
| 38 | #define READERS 50 |
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| 39 | #define WRITERS 50 |
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| 40 | |||
| 41 | static rwlock_t rwlock; |
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| 42 | |||
| 43 | static waitq_t can_start; |
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| 475 | jermar | 44 | static atomic_t items_read; |
| 45 | static atomic_t items_written; |
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| 1 | jermar | 46 | |
| 47 | static void writer(void *arg); |
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| 48 | static void reader(void *arg); |
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| 49 | static void failed(void); |
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| 50 | |||
| 51 | void writer(void *arg) |
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| 52 | { |
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| 53 | waitq_sleep(&can_start); |
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| 54 | |||
| 55 | rwlock_write_lock(&rwlock); |
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| 56 | atomic_inc(&items_written); |
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| 57 | rwlock_write_unlock(&rwlock); |
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| 58 | } |
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| 59 | |||
| 60 | void reader(void *arg) |
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| 61 | { |
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| 62 | waitq_sleep(&can_start); |
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| 63 | |||
| 64 | rwlock_read_lock(&rwlock); |
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| 65 | atomic_inc(&items_read); |
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| 66 | rwlock_read_unlock(&rwlock); |
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| 67 | } |
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| 68 | |||
| 69 | void failed(void) |
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| 70 | { |
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| 71 | printf("Test failed prematurely.\n"); |
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| 72 | thread_exit(); |
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| 73 | } |
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| 74 | |||
| 75 | void test(void) |
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| 76 | { |
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| 77 | int i, j, k; |
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| 483 | jermar | 78 | count_t readers, writers; |
| 1 | jermar | 79 | |
| 80 | printf("Read/write locks test #5\n"); |
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| 81 | |||
| 82 | waitq_initialize(&can_start); |
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| 83 | rwlock_initialize(&rwlock); |
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| 84 | |||
| 85 | for (i=1; i<=3; i++) { |
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| 86 | thread_t *thrd; |
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| 87 | |||
| 627 | jermar | 88 | atomic_set(&items_read, 0); |
| 89 | atomic_set(&items_written, 0); |
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| 1 | jermar | 90 | |
| 91 | readers = i*READERS; |
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| 92 | writers = (4-i)*WRITERS; |
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| 93 | |||
| 94 | printf("Creating %d readers and %d writers...", readers, writers); |
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| 95 | |||
| 96 | for (j=0; j<(READERS+WRITERS)/2; j++) { |
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| 97 | for (k=0; k<i; k++) { |
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| 1062 | jermar | 98 | thrd = thread_create(reader, NULL, TASK, 0, "reader"); |
| 1 | jermar | 99 | if (thrd) |
| 100 | thread_ready(thrd); |
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| 101 | else |
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| 102 | failed(); |
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| 103 | } |
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| 104 | for (k=0; k<(4-i); k++) { |
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| 1062 | jermar | 105 | thrd = thread_create(writer, NULL, TASK, 0, "writer"); |
| 1 | jermar | 106 | if (thrd) |
| 107 | thread_ready(thrd); |
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| 108 | else |
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| 109 | failed(); |
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| 110 | } |
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| 111 | } |
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| 112 | |||
| 113 | printf("ok\n"); |
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| 114 | |||
| 115 | thread_sleep(1); |
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| 116 | waitq_wakeup(&can_start, WAKEUP_ALL); |
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| 117 | |||
| 627 | jermar | 118 | while (items_read.count != readers || items_written.count != writers) { |
| 119 | printf("%d readers remaining, %d writers remaining, readers_in=%d\n", readers - items_read.count, writers - items_written.count, rwlock.readers_in); |
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| 1 | jermar | 120 | thread_usleep(100000); |
| 121 | } |
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| 122 | } |
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| 123 | printf("Test passed.\n"); |
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| 124 | } |