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Make win32 i/o signals atomic and longjmp() safe

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Justine Tunney 2023-11-04 20:29:25 -07:00
parent 585c86e2a4
commit d7917ea076
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20 changed files with 381 additions and 263 deletions
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test/libc/calls/readwrite_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 2023 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/atomic.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/runtime/clktck.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/testlib.h"
#include "libc/thread/thread.h"
jmp_buf jb;
int pfds[2];
atomic_bool isdone;
volatile bool canjmp;
void OnSignal(int sig) {
if (canjmp) {
canjmp = false;
longjmp(jb, 1);
}
}
void *ReadWorker(void *arg) {
int got;
char buf[8];
while (!isdone) {
if (!(got = setjmp(jb))) {
canjmp = true;
read(pfds[0], buf, sizeof(buf));
abort();
}
}
return 0;
}
TEST(eintr, longjmp) {
pthread_t th;
struct sigaction sa = {
.sa_handler = OnSignal,
.sa_flags = SA_SIGINFO | SA_NODEFER,
};
sigaction(SIGUSR1, &sa, 0);
ASSERT_SYS(0, 0, pipe(pfds));
ASSERT_EQ(0, pthread_create(&th, 0, ReadWorker, 0));
for (int i = 0; i < 10; ++i) {
pthread_kill(th, SIGUSR1);
usleep(1. / CLK_TCK * 1e6);
}
isdone = true;
pthread_kill(th, SIGUSR1);
ASSERT_EQ(0, pthread_join(th, 0));
ASSERT_SYS(0, 0, close(pfds[1]));
ASSERT_SYS(0, 0, close(pfds[0]));
}