mirror of
https://github.com/jart/cosmopolitan.git
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29bf8b1a30
- Make rand64() thread safe - Introduce lemur64 lcg prng - Improve strace on New Technology - Improve msync() on New Technology
103 lines
4.1 KiB
C
103 lines
4.1 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/sigbits.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/macros.internal.h"
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#include "libc/rand/rand.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/clone.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/testlib.h"
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#define THREADS 1
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#define ENTRIES 10
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volatile bool ready;
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volatile uint64_t A[THREADS * ENTRIES];
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void OnChld(int sig) {
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// do nothing
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}
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int Thrasher(void *arg) {
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int i, id = (intptr_t)arg;
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while (!ready) asm("pause");
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for (i = 0; i < ENTRIES; ++i) {
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A[id * ENTRIES + i] = rand64();
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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(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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char *stack;
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sigset_t ss, oldss;
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int i, j, rc, ws, tid[THREADS], ptid[THREADS], ctid[THREADS], tls[THREADS];
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if (!IsLinux() && !IsNetbsd()) return;
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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(A, sizeof(A));
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rand64(); // for effect
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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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ready = false;
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for (i = 0; i < THREADS; ++i) {
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stack = gc(malloc(FRAMESIZE));
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tid[i] = clone(Thrasher, stack + FRAMESIZE,
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CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | SIGCHLD,
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(void *)(intptr_t)i, ptid + i, tls + i, ctid + i);
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EXPECT_NE(-1, tid[i]);
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}
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ready = true;
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for (i = 0; i < THREADS; ++i) {
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EXPECT_NE(-1, (rc = waitpid(0, &ws, 0)));
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EXPECT_TRUE(WIFEXITED(ws));
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EXPECT_EQ(0, WEXITSTATUS(ws));
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}
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EXPECT_EQ(0, sigaction(SIGCHLD, &oldsa, 0));
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EXPECT_EQ(0, 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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}
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