tests/test-pthread_sigmask2.c

   1 /* Test of pthread_sigmask in a multi-threaded program.
   2    Copyright (C) 2011-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2011.  */
  18
  19 #include <config.h>
  20
  21 #include <signal.h>
  22
  23 #include <errno.h>
  24 #include <pthread.h>
  25 #include <stdio.h>
  26 #include <unistd.h>
  27
  28 #include "virtualbox.h"
  29 #include "macros.h"
  30
  31 #if USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS
  32
  33 static pthread_t main_thread;
  34 static pthread_t killer_thread;
  35
  36 static void *
  37 killer_thread_func (_GL_UNUSED void *arg)
  38 {
  39   sleep (1);
  40   pthread_kill (main_thread, SIGINT);
  41   return NULL;
  42 }
  43
  44 static volatile int sigint_occurred;
  45
  46 static void
  47 sigint_handler (_GL_UNUSED int sig)
  48 {
  49   sigint_occurred++;
  50 }
  51
  52 int
  53 main ()
  54 {
  55   /* This test occasionally fails on Linux (glibc or musl libc), in a
  56      VirtualBox VM with paravirtualization = Default or KVM, with ≥ 2 CPUs.
  57      Skip the test in this situation.  */
  58   if (is_running_under_virtualbox_kvm () && num_cpus () > 1)
  59     {
  60       fputs ("Skipping test: avoiding VirtualBox bug with KVM paravirtualization\n",
  61              stderr);
  62       return 77;
  63     }
  64
  65   sigset_t set;
  66
  67   signal (SIGINT, sigint_handler);
  68
  69   sigemptyset (&set);
  70   sigaddset (&set, SIGINT);
  71
  72   /* Check error handling.  */
  73   /* This call returns 0 on NetBSD 8.0.  */
  74 #if !defined __NetBSD__
  75   ASSERT (pthread_sigmask (1729, &set, NULL) == EINVAL);
  76 #endif
  77
  78   /* Block SIGINT.  */
  79   ASSERT (pthread_sigmask (SIG_BLOCK, &set, NULL) == 0);
  80
  81   /* Request a SIGINT signal from another thread.  */
  82   main_thread = pthread_self ();
  83   ASSERT (pthread_create (&killer_thread, NULL, killer_thread_func, NULL) == 0);
  84
  85   /* Wait.  */
  86   sleep (2);
  87
  88   /* The signal should not have arrived yet, because it is blocked.  */
  89   ASSERT (sigint_occurred == 0);
  90
  91   /* Unblock SIGINT.  */
  92   ASSERT (pthread_sigmask (SIG_UNBLOCK, &set, NULL) == 0);
  93
  94   /* The signal should have arrived now, because POSIX says
  95        "If there are any pending unblocked signals after the call to
  96         pthread_sigmask(), at least one of those signals shall be delivered
  97         before the call to pthread_sigmask() returns."  */
  98   ASSERT (sigint_occurred == 1);
  99
 100   /* Clean up the thread.  This avoid a "ThreadSanitizer: thread leak" warning
 101      from "gcc -fsanitize=thread".  */
 102   ASSERT (pthread_join (killer_thread, NULL) == 0);
 103
 104   return test_exit_status;
 105 }
 106
 107 #else
 108
 109 int
 110 main ()
 111 {
 112   fputs ("Skipping test: POSIX threads not enabled\n", stderr);
 113   return 77;
 114 }
 115
 116 #endif