gdb/testsuite/gdb.threads/sigstep-threads.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2010-2022 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <pthread.h>
  19 #include <assert.h>
  20 #include <signal.h>
  21
  22 #include <asm/unistd.h>
  23 #include <unistd.h>
  24 #define tgkill(tgid, tid, sig) syscall (__NR_tgkill, (tgid), (tid), (sig))
  25 #define gettid() syscall (__NR_gettid)
  26
  27 static volatile int var;
  28
  29 static void
  30 handler (int signo)     /* step-0 */
  31 {                       /* step-0 */
  32   var++;                /* step-1 */
  33   tgkill (getpid (), gettid (), SIGUSR1);       /* step-2 */
  34 }
  35
  36 static void *
  37 start (void *arg)
  38 {
  39   tgkill (getpid (), gettid (), SIGUSR1);
  40   assert (0);
  41   return NULL;
  42 }
  43
  44 int
  45 main (void)
  46 {
  47   pthread_t thread;
  48
  49   signal (SIGUSR1, handler);
  50
  51   pthread_create (&thread, NULL, start, NULL);
  52   start (NULL); /* main-start */
  53   return 0;
  54 }