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103 lines
2.2 KiB
103 lines
2.2 KiB
4 months ago
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2017 Richard Palethorpe <rpalethorpe@suse.com>
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*/
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/* Basic functionality test for tst_fuzzy_sync.h similar to the atomic tests
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* (test15.c). One thread writes to the odd indexes of an array while the
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* other writes to the even. If the threads are not synchronised then they
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* will probably write to the wrong indexes as they share an index variable
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* which they should take it in turns to update.
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*/
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#include <stdlib.h>
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#include "tst_test.h"
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#include "tst_safe_pthread.h"
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#include "tst_fuzzy_sync.h"
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/* LOOPS * 2 + 1 must be less than INT_MAX */
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#define LOOPS 0xFFFFULL
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static volatile char seq[LOOPS * 2 + 1];
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static struct tst_fzsync_pair pair;
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static volatile int seq_n;
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static volatile char last_wins;
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static void setup(void)
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{
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pair.exec_loops = LOOPS;
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tst_fzsync_pair_init(&pair);
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}
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static void *worker(void *v LTP_ATTRIBUTE_UNUSED)
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{
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unsigned long long i;
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for (i = 0; tst_fzsync_run_b(&pair); i++) {
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tst_fzsync_start_race_b(&pair);
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usleep(1);
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last_wins = 'B';
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tst_fzsync_end_race_b(&pair);
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seq[seq_n] = 'B';
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seq_n = (i + 1) * 2 % (int)LOOPS * 2;
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}
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if (i != LOOPS) {
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tst_res(TFAIL,
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"Worker performed wrong number of iterations: %lld != %lld",
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i, LOOPS);
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}
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return NULL;
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}
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static void run(void)
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{
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unsigned int i, j, fail = 0, lost_race = 0;
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tst_fzsync_pair_reset(&pair, worker);
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for (i = 0; tst_fzsync_run_a(&pair); i++) {
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tst_fzsync_start_race_a(&pair);
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seq[seq_n] = 'A';
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seq_n = i * 2 + 1;
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last_wins = 'A';
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tst_fzsync_end_race_a(&pair);
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if (last_wins == 'B')
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lost_race++;
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}
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tst_res(TINFO, "Checking sequence...");
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for (i = 0; i < LOOPS; i++) {
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j = i * 2;
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if (seq[j] != 'A') {
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tst_res(TFAIL, "Expected A, but found %c at %d",
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seq[j], j);
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fail = 1;
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}
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j = i * 2 + 1;
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if (seq[j] != 'B') {
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tst_res(TFAIL, "Expected A, but found %c at %d",
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seq[j], j);
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fail = 1;
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}
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}
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if (!fail)
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tst_res(TPASS, "Sequence is correct");
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if (lost_race < 100)
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tst_res(TFAIL, "A only lost the race %d times", lost_race);
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else
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tst_res(TPASS, "A lost the race %d times", lost_race);
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}
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static void cleanup(void)
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{
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tst_fzsync_pair_cleanup(&pair);
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}
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static struct tst_test test = {
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.setup = setup,
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.cleanup = cleanup,
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.test_all = run,
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};
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