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4719d415 YQ |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
213516ef | 3 | Copyright 2016-2023 Free Software Foundation, Inc. |
4719d415 YQ |
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 <stdlib.h> | |
20 | #include <unistd.h> | |
21 | #include <sched.h> | |
99ba4b64 | 22 | #include <pthread.h> |
4719d415 YQ |
23 | |
24 | static void | |
25 | marker () | |
26 | {} | |
27 | ||
28 | #define STACK_SIZE 0x1000 | |
29 | ||
99ba4b64 AB |
30 | /* These are used to signal that the threads have started correctly. The |
31 | GLOBAL_THREAD_COUNT is set to the number of threads in main, then | |
32 | decremented (under a lock) in each new thread. */ | |
33 | pthread_mutex_t global_lock = PTHREAD_MUTEX_INITIALIZER; | |
34 | int global_thread_count = 0; | |
35 | ||
4719d415 YQ |
36 | static int |
37 | clone_fn (void *unused) | |
38 | { | |
99ba4b64 AB |
39 | /* Signal that this thread has started correctly. */ |
40 | if (pthread_mutex_lock (&global_lock) != 0) | |
41 | abort (); | |
42 | global_thread_count--; | |
43 | if (pthread_mutex_unlock (&global_lock) != 0) | |
44 | abort (); | |
45 | ||
4719d415 YQ |
46 | return 0; |
47 | } | |
48 | ||
49 | int | |
50 | main (void) | |
51 | { | |
52 | int i, pid; | |
53 | unsigned char *stack[6]; | |
54 | ||
99ba4b64 AB |
55 | /* Due to bug gdb/19675 the cloned thread _might_ try to reenter main |
56 | (this depends on where the displaced instruction is placed for | |
57 | execution). However, if we do reenter main then lets ensure we fail | |
58 | hard rather then just silently executing the code below. */ | |
59 | static int started = 0; | |
60 | if (!started) | |
61 | started = 1; | |
62 | else | |
63 | abort (); | |
64 | ||
4719d415 YQ |
65 | for (i = 0; i < (sizeof (stack) / sizeof (stack[0])); i++) |
66 | stack[i] = malloc (STACK_SIZE); | |
67 | ||
99ba4b64 AB |
68 | global_thread_count = (sizeof (stack) / sizeof (stack[0])); |
69 | ||
4719d415 YQ |
70 | for (i = 0; i < (sizeof (stack) / sizeof (stack[0])); i++) |
71 | { | |
72 | pid = clone (clone_fn, stack[i] + STACK_SIZE, CLONE_FILES | CLONE_VM, | |
73 | NULL); | |
74 | } | |
75 | ||
76 | for (i = 0; i < (sizeof (stack) / sizeof (stack[0])); i++) | |
77 | free (stack[i]); | |
78 | ||
99ba4b64 AB |
79 | /* Set an alarm so we don't end up stuck waiting for threads that might |
80 | never start correctly. */ | |
81 | alarm (120); | |
82 | ||
83 | /* Now wait for all the threads to start up. */ | |
84 | while (global_thread_count != 0) | |
85 | { | |
86 | /* Force memory barrier so GLOBAL_THREAD_COUNT will be refetched. */ | |
87 | asm volatile ("" ::: "memory"); | |
88 | sleep (1); | |
89 | } | |
90 | ||
91 | /* Call marker, this is what GDB is waiting for. */ | |
4719d415 YQ |
92 | marker (); |
93 | } |