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Make improvements

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- Make rand64() thread safe
- Introduce lemur64 lcg prng
- Improve strace on New Technology
- Improve msync() on New Technology
This commit is contained in:
Justine Tunney 2022-04-07 00:15:35 -07:00
parent 43ba3009b2
commit 29bf8b1a30
73 changed files with 888 additions and 269 deletions
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103
test/libc/rand/rand64_test.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/sigbits.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/sigset.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/macros.internal.h"
#include "libc/rand/rand.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/clone.h"
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/testlib.h"
#define THREADS 1
#define ENTRIES 10
volatile bool ready;
volatile uint64_t A[THREADS * ENTRIES];
void OnChld(int sig) {
// do nothing
}
int Thrasher(void *arg) {
int i, id = (intptr_t)arg;
while (!ready) asm("pause");
for (i = 0; i < ENTRIES; ++i) {
A[id * ENTRIES + i] = rand64();
}
return 0;
}
TEST(rand64, testLcg_doesntProduceIdenticalValues) {
int i, j;
bzero(A, sizeof(A));
for (i = 0; i < ARRAYLEN(A); ++i) {
A[i] = rand64();
}
for (i = 0; i < ARRAYLEN(A); ++i) {
EXPECT_NE(0, A[i], "i=%d", i);
for (j = 0; j < ARRAYLEN(A); ++j) {
if (i == j) continue;
EXPECT_NE(A[i], A[j], "i=%d j=%d", i, j);
}
}
}
TEST(rand64, testThreadSafety_doesntProduceIdenticalValues) {
char *stack;
sigset_t ss, oldss;
int i, j, rc, ws, tid[THREADS], ptid[THREADS], ctid[THREADS], tls[THREADS];
if (!IsLinux() && !IsNetbsd()) return;
struct sigaction oldsa;
struct sigaction sa = {.sa_handler = OnChld, .sa_flags = SA_RESTART};
EXPECT_NE(-1, sigaction(SIGCHLD, &sa, &oldsa));
bzero(A, sizeof(A));
rand64(); // for effect
sigemptyset(&ss);
sigaddset(&ss, SIGCHLD);
EXPECT_EQ(0, sigprocmask(SIG_BLOCK, &ss, &oldss));
ready = false;
for (i = 0; i < THREADS; ++i) {
stack = gc(malloc(FRAMESIZE));
tid[i] = clone(Thrasher, stack + FRAMESIZE,
CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | SIGCHLD,
(void *)(intptr_t)i, ptid + i, tls + i, ctid + i);
EXPECT_NE(-1, tid[i]);
}
ready = true;
for (i = 0; i < THREADS; ++i) {
EXPECT_NE(-1, (rc = waitpid(0, &ws, 0)));
EXPECT_TRUE(WIFEXITED(ws));
EXPECT_EQ(0, WEXITSTATUS(ws));
}
EXPECT_EQ(0, sigaction(SIGCHLD, &oldsa, 0));
EXPECT_EQ(0, sigprocmask(SIG_BLOCK, &oldss, 0));
for (i = 0; i < ARRAYLEN(A); ++i) {
EXPECT_NE(0, A[i], "i=%d", i);
for (j = 0; j < ARRAYLEN(A); ++j) {
if (i == j) continue;
EXPECT_NE(A[i], A[j], "i=%d j=%d", i, j);
}
}
}