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https://github.com/jart/cosmopolitan.git
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60cb435cb4
If threads are being used, then fork() will now acquire and release and runtime locks so that fork() may be safely used from threads. This also makes vfork() thread safe, because pthread mutexes will do nothing when the process is a child of vfork(). More torture tests have been written to confirm this all works like a charm. Additionally: - Invent hexpcpy() api - Rename nsync_malloc_() to kmalloc() - Complete posix named semaphore implementation - Make pthread_create() asynchronous signal safe - Add rm, rmdir, and touch to command interpreter builtins - Invent sigisprecious() and modify sigset functions to use it - Add unit tests for posix_spawn() attributes and fix its bugs One unresolved problem is the reclaiming of *NSYNC waiter memory in the forked child processes, within apps which have threads waiting on locks
117 lines
5 KiB
C
117 lines
5 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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│ │
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│ libc-test │
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│ Copyright © 2005-2013 libc-test AUTHORS │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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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/intrin/kprintf.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/testlib/testlib.h"
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#include "libc/thread/thread.h"
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// libc-test/src/regression/raise-race.c
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// commit: 370f78f2c80c64b7b0780a01e672494a26b5678e 2011-03-09
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// commit: 0bed7e0acfd34e3fb63ca0e4d99b7592571355a9 2011-03-09
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// raise should be robust against async fork in a signal handler
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// [jart] i can't believe fork() is async-signal-safe
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#define t_error(...) \
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do { \
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kprintf(__VA_ARGS__); \
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++t_status; \
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} while (0)
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static atomic_int c0;
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static atomic_int c1;
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static atomic_int child;
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static atomic_int t_status;
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static void handler0(int sig) {
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c0++;
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}
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static void handler1(int sig) {
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c1++;
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switch (fork()) {
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case 0:
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child = 1;
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break;
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case -1:
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t_error("fork failed: %s\n", strerror(errno));
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default:
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break;
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}
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}
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static void *start(void *arg) {
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int i, r, s;
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for (i = 0; i < 1000; i++) {
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r = raise(SIGRTMIN);
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if (r) t_error("raise failed: %s\n", strerror(errno));
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}
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if (c0 != 1000) {
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t_error("lost signals: got %d, wanted 1000 (ischild %d forks %d)\n", c0,
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child, c1);
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}
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if (child) _exit(t_status);
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/* make sure we got all pthread_kills, then wait the forked children */
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while (c1 < 100) donothing;
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for (i = 0; i < 100; i++) {
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r = wait(&s);
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if (r == -1) {
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t_error("wait failed: %s\n", strerror(errno));
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} else if (!WIFEXITED(s) || WTERMSIG(s)) {
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t_error("child failed: pid:%d status:%d sig:%s\n", r, s,
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strsignal(WTERMSIG(s)));
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}
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}
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return 0;
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}
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TEST(raise, test) {
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if (IsNetbsd()) return; // why doesn't it work?
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if (IsOpenbsd()) return; // no support for realtime signals yet
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if (IsXnu()) return; // no support for realtime signals yet
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if (IsWindows()) return; // TODO(jart): why does it exit 128+SIGRTMIN?
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void *p;
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int r, i, s;
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pthread_t t;
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if (signal(SIGRTMIN, handler0) == SIG_ERR)
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t_error("registering signal handler failed: %s\n", strerror(errno));
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if (signal(SIGRTMIN + 1, handler1) == SIG_ERR)
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t_error("registering signal handler failed: %s\n", strerror(errno));
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r = pthread_create(&t, 0, start, 0);
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if (r) t_error("pthread_create failed: %s\n", strerror(r));
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for (i = 0; i < 100; i++) {
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r = pthread_kill(t, SIGRTMIN + 1);
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if (r) t_error("phread_kill failed: %s\n", strerror(r));
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}
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r = pthread_join(t, &p);
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if (r) t_error("pthread_join failed: %s\n", strerror(r));
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ASSERT_EQ(0, t_status);
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}
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