gdb/testsuite/gdb.threads/interrupted-hand-call.c

   1 /* Test case for hand function calls interrupted by a signal in another thread.
   2
   3    Copyright 2008-2017 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include <pthread.h>
  21 #include <signal.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <time.h>
  25 #include <unistd.h>
  26
  27 #ifndef NR_THREADS
  28 #define NR_THREADS 4
  29 #endif
  30
  31 pthread_t threads[NR_THREADS];
  32
  33 /* Number of threads currently running.  */
  34 int thread_count;
  35
  36 pthread_mutex_t thread_count_mutex;
  37
  38 pthread_cond_t thread_count_condvar;
  39
  40 sig_atomic_t sigabrt_received;
  41
  42 void
  43 incr_thread_count (void)
  44 {
  45   pthread_mutex_lock (&thread_count_mutex);
  46   ++thread_count;
  47   if (thread_count == NR_THREADS)
  48     pthread_cond_signal (&thread_count_condvar);
  49   pthread_mutex_unlock (&thread_count_mutex);
  50 }
  51
  52 void
  53 cond_wait (pthread_cond_t *cond, pthread_mutex_t *mut)
  54 {
  55   pthread_mutex_lock (mut);
  56   pthread_cond_wait (cond, mut);
  57   pthread_mutex_unlock (mut);
  58 }
  59
  60 void
  61 noreturn (void)
  62 {
  63   pthread_mutex_t mut;
  64   pthread_cond_t cond;
  65
  66   pthread_mutex_init (&mut, NULL);
  67   pthread_cond_init (&cond, NULL);
  68
  69   /* Wait for a condition that will never be signaled, so we effectively
  70      block the thread here.  */
  71   cond_wait (&cond, &mut);
  72 }
  73
  74 void *
  75 thread_entry (void *unused)
  76 {
  77   incr_thread_count ();
  78   noreturn ();
  79 }
  80
  81 void
  82 sigabrt_handler (int signo)
  83 {
  84   sigabrt_received = 1;
  85 }
  86
  87 /* Helper to test a hand-call being "interrupted" by a signal on another
  88    thread.  */
  89
  90 void
  91 hand_call_with_signal (void)
  92 {
  93   const struct timespec ts = { 0, 10000000 }; /* 0.01 sec */
  94
  95   sigabrt_received = 0;
  96   pthread_kill (threads[0], SIGABRT);
  97   while (! sigabrt_received)
  98     nanosleep (&ts, NULL);
  99 }
 100
 101 /* Wait until all threads are running.  */
 102
 103 void
 104 wait_all_threads_running (void)
 105 {
 106   pthread_mutex_lock (&thread_count_mutex);
 107   if (thread_count == NR_THREADS)
 108     {
 109       pthread_mutex_unlock (&thread_count_mutex);
 110       return;
 111     }
 112   pthread_cond_wait (&thread_count_condvar, &thread_count_mutex);
 113   if (thread_count == NR_THREADS)
 114     {
 115       pthread_mutex_unlock (&thread_count_mutex);
 116       return;
 117     }
 118   pthread_mutex_unlock (&thread_count_mutex);
 119   printf ("failed waiting for all threads to start\n");
 120   abort ();
 121 }
 122
 123 /* Called when all threads are running.
 124    Easy place for a breakpoint.  */
 125
 126 void
 127 all_threads_running (void)
 128 {
 129 }
 130
 131 int
 132 main (void)
 133 {
 134   int i;
 135
 136   signal (SIGABRT, sigabrt_handler);
 137
 138   pthread_mutex_init (&thread_count_mutex, NULL);
 139   pthread_cond_init (&thread_count_condvar, NULL);
 140
 141   for (i = 0; i < NR_THREADS; ++i)
 142     pthread_create (&threads[i], NULL, thread_entry, NULL);
 143
 144   wait_all_threads_running ();
 145   all_threads_running ();
 146
 147   return 0;
 148 }
 149