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https://github.com/jart/cosmopolitan.git
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99dc1281f5
The new asynchronous signal delivery technique is now also being used for tkill(), raise(), etc. Many subtle issues have been addresesd. We now signal handling on Windows that's remarkably similar to the POSIX behaviors. However that's just across threads. We're lacking a way to have the signal semantics work well, across multiple WIN32 processes.
116 lines
4.2 KiB
C
116 lines
4.2 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/atomic.h"
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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/dce.h"
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#include "libc/errno.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/testlib/subprocess.h"
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#include "libc/testlib/testlib.h"
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#include "libc/thread/thread.h"
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int fds[2];
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_Thread_local sig_atomic_t gotsig;
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void SetUp(void) {
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if (IsXnuSilicon()) {
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fprintf(stderr, "TODO(jart): Get pthread_kill() working on XNU silicon\n");
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exit(0);
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}
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}
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void OnSig(int sig) {
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gotsig = 1;
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}
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void *ReadWorker(void *arg) {
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char buf[8];
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ASSERT_SYS(EINTR, -1, read(fds[0], buf, 8));
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ASSERT_TRUE(gotsig);
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return 0;
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}
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TEST(pthread_kill, canCancelReadOperation) {
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pthread_t t;
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struct sigaction oldsa;
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struct sigaction sa = {.sa_handler = OnSig};
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ASSERT_SYS(0, 0, sigaction(SIGUSR1, &sa, &oldsa));
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ASSERT_SYS(0, 0, pipe(fds));
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ASSERT_EQ(0, pthread_create(&t, 0, ReadWorker, 0));
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ASSERT_SYS(0, 0, usleep(100000)); // potentially flaky
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ASSERT_EQ(0, pthread_kill(t, SIGUSR1));
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ASSERT_EQ(0, pthread_join(t, 0));
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ASSERT_FALSE(gotsig);
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ASSERT_SYS(0, 0, close(fds[0]));
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ASSERT_SYS(0, 0, close(fds[1]));
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ASSERT_SYS(0, 0, sigaction(SIGUSR1, &oldsa, 0));
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}
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volatile unsigned got_sig_async;
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volatile pthread_t cpu_worker_th;
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volatile unsigned is_wasting_cpu;
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void OnSigAsync(int sig) {
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ASSERT_TRUE(pthread_equal(cpu_worker_th, pthread_self()));
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got_sig_async = 1;
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}
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void *CpuWorker(void *arg) {
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cpu_worker_th = pthread_self();
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while (!got_sig_async) {
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is_wasting_cpu = 1;
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}
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return 0;
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}
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TEST(pthread_kill, canAsynchronouslyRunHandlerInsideTargetThread) {
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pthread_t t;
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struct sigaction oldsa;
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struct sigaction sa = {.sa_handler = OnSigAsync};
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ASSERT_SYS(0, 0, sigaction(SIGUSR1, &sa, &oldsa));
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ASSERT_EQ(0, pthread_create(&t, 0, CpuWorker, 0));
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while (!is_wasting_cpu) donothing;
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ASSERT_EQ(0, pthread_kill(t, SIGUSR1));
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ASSERT_EQ(0, pthread_join(t, 0));
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ASSERT_TRUE(got_sig_async);
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ASSERT_SYS(0, 0, sigaction(SIGUSR1, &oldsa, 0));
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}
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volatile int is_having_fun;
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void *FunWorker(void *arg) {
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for (;;) {
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is_having_fun = 1;
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sched_yield();
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}
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return 0;
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}
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TEST(pthread_kill, defaultThreadSignalHandlerWillKillWholeProcess) {
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SPAWN(fork);
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pthread_t t;
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ASSERT_EQ(0, pthread_create(&t, 0, FunWorker, 0));
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while (!is_having_fun) sched_yield();
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ASSERT_SYS(0, 0, pthread_kill(t, SIGKILL));
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for (;;) sched_yield();
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TERMS(SIGKILL);
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}
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