forked from Qortal/Brooklyn
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47 lines
872 B
47 lines
872 B
// SPDX-License-Identifier: GPL-2.0 |
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#include <stdio.h> |
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#include <pthread.h> |
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pthread_mutex_t a = PTHREAD_MUTEX_INITIALIZER; |
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pthread_mutex_t b = PTHREAD_MUTEX_INITIALIZER; |
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pthread_barrier_t bar; |
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void *ba_lock(void *arg) |
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{ |
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int ret, i; |
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pthread_mutex_lock(&b); |
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if (pthread_barrier_wait(&bar) == PTHREAD_BARRIER_SERIAL_THREAD) |
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pthread_barrier_destroy(&bar); |
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pthread_mutex_lock(&a); |
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pthread_mutex_unlock(&a); |
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pthread_mutex_unlock(&b); |
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} |
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int main(void) |
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{ |
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pthread_t t; |
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pthread_barrier_init(&bar, NULL, 2); |
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if (pthread_create(&t, NULL, ba_lock, NULL)) { |
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fprintf(stderr, "pthread_create() failed\n"); |
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return 1; |
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} |
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pthread_mutex_lock(&a); |
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if (pthread_barrier_wait(&bar) == PTHREAD_BARRIER_SERIAL_THREAD) |
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pthread_barrier_destroy(&bar); |
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pthread_mutex_lock(&b); |
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pthread_mutex_unlock(&b); |
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pthread_mutex_unlock(&a); |
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pthread_join(t, NULL); |
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return 0; |
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}
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