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* Copyright (c) 2001-2004 Jakub Jermar
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <proc/thread.h>
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#include <synch/rwlock.h>
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static atomic_t thread_count;
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static rwlock_t rwlock;
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static void reader(void *arg)
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thread_detach(THREAD);
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TPRINTF("cpu%u, tid %" PRIu64 ": trying to lock rwlock for reading....\n", CPU->id, THREAD->tid);
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rwlock_read_lock(&rwlock);
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rwlock_read_unlock(&rwlock);
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TPRINTF("cpu%u, tid %" PRIu64 ": success\n", CPU->id, THREAD->tid);
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TPRINTF("cpu%u, tid %" PRIu64 ": trying to lock rwlock for writing....\n", CPU->id, THREAD->tid);
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rwlock_write_lock(&rwlock);
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rwlock_write_unlock(&rwlock);
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TPRINTF("cpu%u, tid %" PRIu64 ": success\n", CPU->id, THREAD->tid);
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atomic_dec(&thread_count);
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char *test_rwlock3(void)
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atomic_set(&thread_count, THREADS);
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rwlock_initialize(&rwlock);
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rwlock_write_lock(&rwlock);
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for (i = 0; i < THREADS; i++) {
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thrd = thread_create(reader, NULL, TASK, 0, "reader", false);
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TPRINTF("Could not create reader %d\n", i);
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rwlock_write_unlock(&rwlock);
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while (atomic_get(&thread_count) > 0) {
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TPRINTF("Threads left: %ld\n", atomic_get(&thread_count));