tests/test-pthread_sigmask2.c

   1 /* Test of pthread_sigmask in a multi-threaded program.
   2    Copyright (C) 2011-2017 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 <http://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 <stdio.h>
  25 #include <unistd.h>
  26
  27 #include "glthread/thread.h"
  28
  29 #include "macros.h"
  30
  31 #if USE_POSIX_THREADS
  32
  33 static gl_thread_t main_thread;
  34 static gl_thread_t killer_thread;
  35
  36 static void *
  37 killer_thread_func (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 (int sig)
  48 {
  49   sigint_occurred++;
  50 }
  51
  52 int
  53 main (int argc, char *argv[])
  54 {
  55   sigset_t set;
  56
  57   signal (SIGINT, sigint_handler);
  58
  59   sigemptyset (&set);
  60   sigaddset (&set, SIGINT);
  61
  62   /* Check error handling.  */
  63   ASSERT (pthread_sigmask (1729, &set, NULL) == EINVAL);
  64
  65   /* Block SIGINT.  */
  66   ASSERT (pthread_sigmask (SIG_BLOCK, &set, NULL) == 0);
  67
  68   /* Request a SIGINT signal from another thread.  */
  69   main_thread = gl_thread_self ();
  70   ASSERT (glthread_create (&killer_thread, killer_thread_func, NULL) == 0);
  71
  72   /* Wait.  */
  73   sleep (2);
  74
  75   /* The signal should not have arrived yet, because it is blocked.  */
  76   ASSERT (sigint_occurred == 0);
  77
  78   /* Unblock SIGINT.  */
  79   ASSERT (pthread_sigmask (SIG_UNBLOCK, &set, NULL) == 0);
  80
  81   /* The signal should have arrived now, because POSIX says
  82        "If there are any pending unblocked signals after the call to
  83         pthread_sigmask(), at least one of those signals shall be delivered
  84         before the call to pthread_sigmask() returns."  */
  85   ASSERT (sigint_occurred == 1);
  86
  87   return 0;
  88 }
  89
  90 #else
  91
  92 int
  93 main ()
  94 {
  95   fputs ("Skipping test: POSIX threads not enabled\n", stderr);
  96   return 77;
  97 }
  98
  99 #endif