mirror of
https://github.com/jart/cosmopolitan.git
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101 lines
3.9 KiB
C
101 lines
3.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/internal.h"
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#include "libc/stdio/rand.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/sa.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/testlib/ezbench.h"
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#include "libc/testlib/testlib.h"
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#include "libc/thread/thread.h"
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#define THREADS 8
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#define ENTRIES 100
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volatile uint64_t A[THREADS * ENTRIES];
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pthread_barrier_t barrier;
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void SetUpOnce(void) {
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ASSERT_SYS(0, 0, pledge("stdio", 0));
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}
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void OnChld(int sig) {
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// do nothing
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}
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dontinline void Generate(int i) {
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A[i] = _rand64();
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}
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void *Thrasher(void *arg) {
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int i, id = (intptr_t)arg;
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pthread_barrier_wait(&barrier);
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for (i = 0; i < ENTRIES; ++i) {
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Generate(id * ENTRIES + i);
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}
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return 0;
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}
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TEST(_rand64, testLcg_doesntProduceIdenticalValues) {
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int i, j;
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bzero((void *)A, sizeof(A));
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for (i = 0; i < ARRAYLEN(A); ++i) {
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A[i] = _rand64();
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}
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for (i = 0; i < ARRAYLEN(A); ++i) {
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EXPECT_NE(0, A[i], "i=%d", i);
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for (j = 0; j < ARRAYLEN(A); ++j) {
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if (i == j) continue;
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EXPECT_NE(A[i], A[j], "i=%d j=%d", i, j);
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}
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}
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}
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TEST(_rand64, testThreadSafety_doesntProduceIdenticalValues) {
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int i, j;
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sigset_t ss, oldss;
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pthread_t th[THREADS];
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struct sigaction oldsa;
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struct sigaction sa = {.sa_handler = OnChld, .sa_flags = SA_RESTART};
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EXPECT_NE(-1, sigaction(SIGCHLD, &sa, &oldsa));
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bzero((void *)A, sizeof(A));
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sigemptyset(&ss);
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sigaddset(&ss, SIGCHLD);
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EXPECT_EQ(0, sigprocmask(SIG_BLOCK, &ss, &oldss));
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ASSERT_EQ(0, pthread_barrier_init(&barrier, 0, THREADS));
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for (i = 0; i < THREADS; ++i) {
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ASSERT_EQ(0, pthread_create(th + i, 0, Thrasher, (void *)(intptr_t)i));
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}
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for (i = 0; i < THREADS; ++i) {
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ASSERT_EQ(0, pthread_join(th[i], 0));
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}
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sigaction(SIGCHLD, &oldsa, 0);
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sigprocmask(SIG_BLOCK, &oldss, 0);
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for (i = 0; i < ARRAYLEN(A); ++i) {
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EXPECT_NE(0, A[i], "i=%d", i);
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for (j = 0; j < ARRAYLEN(A); ++j) {
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if (i == j) continue;
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EXPECT_NE(A[i], A[j], "i=%d j=%d", i, j);
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}
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}
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ASSERT_EQ(0, pthread_barrier_destroy(&barrier));
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}
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