1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2012-2015 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 31 /* Count the number of tasks/threads in the PID thread group. */ 32 33 static int 34 count_tasks (pid_t pid) 35 { 36 char path[100]; 37 int count; 38 DIR *d; 39 40 snprintf (path, sizeof (path), "/proc/%d/task/", (int) pid); 41 d = opendir (path); 42 if (d == NULL) 43 return -1; 44 45 for (count = 0; readdir (d) != NULL; count++) 46 ; 47 closedir (d); 48 49 /* Account for '.' and '..'. */ 50 assert (count > 2); 51 return count - 2; 52 } 53 54 pthread_attr_t attr[CPU_SETSIZE]; 55 pthread_t thr[CPU_SETSIZE]; 56 57 static void * 58 mythread (void *_arg) 59 { 60 return NULL; 61 } 62 63 int 64 main () 65 { 66 int i; 67 68 for (i = 0; i < CPU_SETSIZE; i++) 69 { 70 cpu_set_t set; 71 int ret; 72 73 pthread_attr_init (&attr[i]); 74 CPU_ZERO_S (sizeof (set), &set); 75 CPU_SET_S (i, sizeof (set), &set); 76 77 ret = pthread_attr_setaffinity_np (&attr[i], sizeof (set), &set); 78 if (ret != 0) 79 { 80 fprintf (stderr, "set_affinity: %d: %s\n", ret, strerror (ret)); 81 exit (3); 82 } 83 ret = pthread_create (&thr[i], &attr[i], mythread, NULL); 84 /* Should fail with EINVAL at some point. */ 85 if (ret != 0) 86 { 87 unsigned long t; 88 89 fprintf (stderr, "pthread_create: %d: %s\n", ret, strerror (ret)); 90 91 /* Wait for all threads to exit. pthread_create spawns a 92 clone thread even in the failing case, as it can only try 93 to set the affinity after creating the thread. That new 94 thread is immediately canceled (because setting the 95 affinity fails), by killing it with a SIGCANCEL signal, 96 which may end up in pthread_cancel/unwind paths, which 97 may trigger a libgcc_s.so load, making the thread hit the 98 solib-event breakpoint. Now, if we would let the program 99 exit without waiting, sometimes it would happen that the 100 inferior exits just while we're handling the solib-event, 101 resulting in errors being thrown due to failing ptrace 102 call fails (with ESCHR), breaking the test. */ 103 t = 16; 104 while (count_tasks (getpid ()) > 1) 105 { 106 usleep (t); 107 108 if (t < 256) 109 t *= 2; 110 } 111 112 /* Normal exit, because this is what we are expecting. */ 113 exit (0); 114 } 115 } 116 117 /* Should not normally be reached. */ 118 exit (1); 119 } 120