gdb/testsuite/gdb.threads/queue-signal.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2014-2021 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 <signal.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22
  23 /* Used to individually advance each thread to the desired stopping point.  */
  24 int ready;
  25
  26 sig_atomic_t sigusr1_received;
  27 sig_atomic_t sigusr2_received;
  28 sig_atomic_t sigabrt_received;
  29
  30 /* Number of threads currently running.  */
  31 int thread_count;
  32 pthread_mutex_t thread_count_mutex;
  33 pthread_cond_t thread_count_condvar;
  34
  35 static void
  36 incr_thread_count (void)
  37 {
  38   pthread_mutex_lock (&thread_count_mutex);
  39   ++thread_count;
  40   pthread_cond_signal (&thread_count_condvar);
  41   pthread_mutex_unlock (&thread_count_mutex);
  42 }
  43
  44 static void
  45 sigusr1_handler (int sig)
  46 {
  47   sigusr1_received = 1;
  48 }
  49
  50 static void
  51 sigusr2_handler (int sig)
  52 {
  53   sigusr2_received = 1;
  54 }
  55
  56 static void
  57 sigabrt_handler (int sig)
  58 {
  59   sigabrt_received = 1;
  60 }
  61
  62 static void *
  63 sigusr1_thread_function (void *unused)
  64 {
  65   incr_thread_count ();
  66   while (!ready)
  67     usleep (100);
  68   pthread_kill (pthread_self (), SIGUSR1);
  69 }
  70
  71 static void *
  72 sigusr2_thread_function (void *unused)
  73 {
  74   incr_thread_count ();
  75   while (!ready)
  76     usleep (100);
  77   /* pthread_kill (pthread_self (), SIGUSR2); - manually injected by gdb */
  78 }
  79
  80 /* Wait until all threads are at a point where a backtrace will
  81    show the thread entry point function.  */
  82
  83 static void
  84 wait_all_threads_running (int nr_threads)
  85 {
  86   pthread_mutex_lock (&thread_count_mutex);
  87
  88   while (1)
  89     {
  90       if (thread_count == nr_threads)
  91         {
  92           pthread_mutex_unlock (&thread_count_mutex);
  93           return;
  94         }
  95       pthread_cond_wait (&thread_count_condvar, &thread_count_mutex);
  96     }
  97 }
  98
  99 static void
 100 all_threads_running (void)
 101 {
 102   while (!ready)
 103     usleep (100);
 104 }
 105
 106 static void
 107 all_threads_done (void)
 108 {
 109 }
 110
 111 int
 112 main ()
 113 {
 114   pthread_t sigusr1_thread, sigusr2_thread;
 115
 116   /* Protect against running forever.  */
 117   alarm (60);
 118
 119   signal (SIGUSR1, sigusr1_handler);
 120   signal (SIGUSR2, sigusr2_handler);
 121   signal (SIGABRT, sigabrt_handler);
 122
 123   /* Don't let any thread advance past initialization.  */
 124   ready = 0;
 125
 126   pthread_mutex_init (&thread_count_mutex, NULL);
 127   pthread_cond_init (&thread_count_condvar, NULL);
 128
 129 #define NR_THREADS 2
 130   pthread_create (&sigusr1_thread, NULL, sigusr1_thread_function, NULL);
 131   pthread_create (&sigusr2_thread, NULL, sigusr2_thread_function, NULL);
 132   wait_all_threads_running (NR_THREADS);
 133   all_threads_running ();
 134
 135   pthread_kill (pthread_self (), SIGABRT);
 136
 137   pthread_join (sigusr1_thread, NULL);
 138   pthread_join (sigusr2_thread, NULL);
 139   all_threads_done ();
 140
 141   return 0;
 142 }