| 0,0 → 1,163 |
|---|
| /* |
| * Copyright (C) 2001-2004 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <test.h> |
| #include <arch.h> |
| #include <atomic.h> |
| #include <print.h> |
| #include <proc/thread.h> |
| #include <arch/types.h> |
| #include <arch/context.h> |
| #include <context.h> |
| #include <panic.h> |
| |
| #include <synch/waitq.h> |
| #include <synch/rwlock.h> |
| #include <synch/synch.h> |
| #include <synch/spinlock.h> |
| |
| #define READERS 50 |
| #define WRITERS 50 |
| |
| static rwlock_t rwlock; |
| |
| SPINLOCK_INITIALIZE(lock); |
| |
| static waitq_t can_start; |
| |
| uint32_t seed = 0xdeadbeef; |
| |
| static uint32_t random(uint32_t max); |
| |
| static void writer(void *arg); |
| static void reader(void *arg); |
| static void failed(void); |
| |
| uint32_t random(uint32_t max) |
| { |
| uint32_t rc; |
| |
| spinlock_lock(&lock); |
| rc = seed % max; |
| seed = (((seed<<2) ^ (seed>>2)) * 487) + rc; |
| spinlock_unlock(&lock); |
| return rc; |
| } |
| |
| |
| void writer(void *arg) |
| { |
| int rc, to; |
| thread_detach(THREAD); |
| waitq_sleep(&can_start); |
| |
| to = random(40000); |
| printf("cpu%d, tid %d w+ (%d)\n", CPU->id, THREAD->tid, to); |
| rc = rwlock_write_lock_timeout(&rwlock, to); |
| if (SYNCH_FAILED(rc)) { |
| printf("cpu%d, tid %d w!\n", CPU->id, THREAD->tid); |
| return; |
| }; |
| printf("cpu%d, tid %d w=\n", CPU->id, THREAD->tid); |
| |
| if (rwlock.readers_in) panic("Oops."); |
| thread_usleep(random(1000000)); |
| if (rwlock.readers_in) panic("Oops."); |
| |
| rwlock_write_unlock(&rwlock); |
| printf("cpu%d, tid %d w-\n", CPU->id, THREAD->tid); |
| } |
| |
| void reader(void *arg) |
| { |
| int rc, to; |
| thread_detach(THREAD); |
| waitq_sleep(&can_start); |
| |
| to = random(2000); |
| printf("cpu%d, tid %d r+ (%d)\n", CPU->id, THREAD->tid, to); |
| rc = rwlock_read_lock_timeout(&rwlock, to); |
| if (SYNCH_FAILED(rc)) { |
| printf("cpu%d, tid %d r!\n", CPU->id, THREAD->tid); |
| return; |
| } |
| printf("cpu%d, tid %d r=\n", CPU->id, THREAD->tid); |
| thread_usleep(30000); |
| rwlock_read_unlock(&rwlock); |
| printf("cpu%d, tid %d r-\n", CPU->id, THREAD->tid); |
| } |
| |
| void failed(void) |
| { |
| printf("Test failed prematurely.\n"); |
| thread_exit(); |
| } |
| |
| void test(void) |
| { |
| context_t ctx; |
| uint32_t i, k; |
| |
| printf("Read/write locks test #4\n"); |
| |
| waitq_initialize(&can_start); |
| rwlock_initialize(&rwlock); |
| |
| |
| |
| for (; ;) { |
| thread_t *thrd; |
| |
| context_save(&ctx); |
| printf("sp=%#x, readers_in=%d\n", ctx.sp, rwlock.readers_in); |
| |
| k = random(7) + 1; |
| printf("Creating %d readers\n", k); |
| for (i=0; i<k; i++) { |
| thrd = thread_create(reader, NULL, TASK, 0, "reader"); |
| if (thrd) |
| thread_ready(thrd); |
| else |
| failed(); |
| } |
| |
| k = random(5) + 1; |
| printf("Creating %d writers\n", k); |
| for (i=0; i<k; i++) { |
| thrd = thread_create(writer, NULL, TASK, 0, "writer"); |
| if (thrd) |
| thread_ready(thrd); |
| else |
| failed(); |
| } |
| |
| thread_usleep(20000); |
| waitq_wakeup(&can_start, WAKEUP_ALL); |
| } |
| |
| } |