static void * thread(void *null) { struct block *context = null; int i = ITERATE; unsigned int l; if (aff_iterate(&a)) { perror("ERROR: Could not affine thread"); exit(EXIT_FAILURE); } if (context->tid == (unsigned int)nthr - 1) context->tid = sizeof(lock.readers) + 1; while (i--) { ck_bytelock_write_lock(&lock, context->tid); { l = ck_pr_load_uint(&locked); if (l != 0) { ck_error("ERROR [WR:%d]: %u != 0\n", __LINE__, l); } ck_pr_inc_uint(&locked); ck_pr_inc_uint(&locked); ck_pr_inc_uint(&locked); ck_pr_inc_uint(&locked); ck_pr_inc_uint(&locked); ck_pr_inc_uint(&locked); ck_pr_inc_uint(&locked); ck_pr_inc_uint(&locked); l = ck_pr_load_uint(&locked); if (l != 8) { ck_error("ERROR [WR:%d]: %u != 2\n", __LINE__, l); } ck_pr_dec_uint(&locked); ck_pr_dec_uint(&locked); ck_pr_dec_uint(&locked); ck_pr_dec_uint(&locked); ck_pr_dec_uint(&locked); ck_pr_dec_uint(&locked); ck_pr_dec_uint(&locked); ck_pr_dec_uint(&locked); l = ck_pr_load_uint(&locked); if (l != 0) { ck_error("ERROR [WR:%d]: %u != 0\n", __LINE__, l); } } ck_bytelock_write_unlock(&lock); ck_bytelock_read_lock(&lock, context->tid); { l = ck_pr_load_uint(&locked); if (l != 0) { ck_error("ERROR [RD:%d]: %u != 0\n", __LINE__, l); } } ck_bytelock_read_unlock(&lock, context->tid); } return (NULL); }
int main(void) { uint64_t s_b, e_b, i; ck_bytelock_t bytelock = CK_BYTELOCK_INITIALIZER; rwlock_t naive; for (i = 0; i < STEPS; i++) { ck_bytelock_write_lock(&bytelock, 1); ck_bytelock_write_unlock(&bytelock); } s_b = rdtsc(); for (i = 0; i < STEPS; i++) { ck_bytelock_write_lock(&bytelock, 1); ck_bytelock_write_unlock(&bytelock); } e_b = rdtsc(); printf("WRITE: bytelock %15" PRIu64 "\n", (e_b - s_b) / STEPS); rwlock_init(&naive); for (i = 0; i < STEPS; i++) { rwlock_write_lock(&naive); rwlock_write_unlock(&naive); } s_b = rdtsc(); for (i = 0; i < STEPS; i++) { rwlock_write_lock(&naive); rwlock_write_unlock(&naive); } e_b = rdtsc(); printf("WRITE: naive %15" PRIu64 "\n", (e_b - s_b) / STEPS); for (i = 0; i < STEPS; i++) { ck_bytelock_read_lock(&bytelock, 1); ck_bytelock_read_unlock(&bytelock, 1); } s_b = rdtsc(); for (i = 0; i < STEPS; i++) { ck_bytelock_read_lock(&bytelock, 1); ck_bytelock_read_unlock(&bytelock, 1); } e_b = rdtsc(); printf("READ: bytelock %15" PRIu64 "\n", (e_b - s_b) / STEPS); for (i = 0; i < STEPS; i++) { rwlock_read_lock(&naive); rwlock_read_unlock(&naive); } s_b = rdtsc(); for (i = 0; i < STEPS; i++) { rwlock_read_lock(&naive); rwlock_read_unlock(&naive); } e_b = rdtsc(); printf("READ: naive %15" PRIu64 "\n", (e_b - s_b) / STEPS); return (0); }