1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2012-2017 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 #define _GNU_SOURCE 19 #include <pthread.h> 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <sched.h> 23 #include <errno.h> 24 #include <string.h> 25 #include <assert.h> 26 #include <stdio.h> 27 #include <sys/types.h> 28 #include <dirent.h> 29 #include <assert.h> 30 #include <unistd.h> 31 32 /* Count the number of tasks/threads in the PID thread group. */ 33 34 static int 35 count_tasks (pid_t pid) 36 { 37 char path[100]; 38 int count; 39 DIR *d; 40 41 snprintf (path, sizeof (path), "/proc/%d/task/", (int) pid); 42 d = opendir (path); 43 if (d == NULL) 44 return -1; 45 46 for (count = 0; readdir (d) != NULL; count++) 47 ; 48 closedir (d); 49 50 /* Account for '.' and '..'. */ 51 assert (count > 2); 52 return count - 2; 53 } 54 55 pthread_attr_t attr[CPU_SETSIZE]; 56 pthread_t thr[CPU_SETSIZE]; 57 58 static void * 59 mythread (void *_arg) 60 { 61 return NULL; 62 } 63 64 int 65 main () 66 { 67 int i; 68 69 for (i = 0; i < CPU_SETSIZE; i++) 70 { 71 cpu_set_t set; 72 int ret; 73 74 pthread_attr_init (&attr[i]); 75 CPU_ZERO_S (sizeof (set), &set); 76 CPU_SET_S (i, sizeof (set), &set); 77 78 ret = pthread_attr_setaffinity_np (&attr[i], sizeof (set), &set); 79 if (ret != 0) 80 { 81 fprintf (stderr, "set_affinity: %d: %s\n", ret, strerror (ret)); 82 exit (3); 83 } 84 ret = pthread_create (&thr[i], &attr[i], mythread, NULL); 85 /* Should fail with EINVAL at some point. */ 86 if (ret != 0) 87 { 88 unsigned long t; 89 90 fprintf (stderr, "pthread_create: %d: %s\n", ret, strerror (ret)); 91 92 /* Wait for all threads to exit. pthread_create spawns a 93 clone thread even in the failing case, as it can only try 94 to set the affinity after creating the thread. That new 95 thread is immediately canceled (because setting the 96 affinity fails), by killing it with a SIGCANCEL signal, 97 which may end up in pthread_cancel/unwind paths, which 98 may trigger a libgcc_s.so load, making the thread hit the 99 solib-event breakpoint. Now, if we would let the program 100 exit without waiting, sometimes it would happen that the 101 inferior exits just while we're handling the solib-event, 102 resulting in errors being thrown due to failing ptrace 103 call fails (with ESCHR), breaking the test. */ 104 t = 16; 105 while (count_tasks (getpid ()) > 1) 106 { 107 usleep (t); 108 109 if (t < 256) 110 t *= 2; 111 } 112 113 /* Normal exit, because this is what we are expecting. */ 114 exit (0); 115 } 116 } 117 118 /* Should not normally be reached. */ 119 exit (1); 120 } 121