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06da0f77 PL |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
618f726f | 3 | Copyright 2015-2016 Free Software Foundation, Inc. |
06da0f77 PL |
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> | |
430e004e | 19 | #include "trace-common.h" |
06da0f77 PL |
20 | |
21 | /* Called if the testcase failed. */ | |
22 | static void | |
23 | fail (void) | |
24 | { | |
25 | } | |
26 | ||
27 | static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; | |
28 | ||
29 | /* This function overrides gdb_collect in the in-process agent library. | |
30 | See gdbserver/tracepoint.c (gdb_collect). We want this function to | |
31 | be ran instead of the one from the library to easily check that only | |
32 | one thread is tracing at a time. | |
33 | ||
34 | This works as expected because GDBserver will ask GDB about symbols | |
35 | present in the inferior with the 'qSymbol' packet. And GDB will | |
36 | reply with the address of this function instead of the one from the | |
37 | in-process agent library. */ | |
38 | ||
39 | void | |
40 | gdb_agent_gdb_collect (void *tpoint, unsigned char *regs) | |
41 | { | |
42 | /* If we cannot acquire a lock, then this means another thread is | |
43 | tracing and the lock implemented by the jump pad is not working! */ | |
44 | if (pthread_mutex_trylock (&mutex) != 0) | |
45 | { | |
46 | fail (); | |
47 | return; | |
48 | } | |
49 | ||
50 | sleep (1); | |
51 | ||
52 | if (pthread_mutex_unlock (&mutex) != 0) | |
53 | { | |
54 | fail (); | |
55 | return; | |
56 | } | |
57 | } | |
58 | ||
06da0f77 PL |
59 | static void * |
60 | thread_function (void *arg) | |
61 | { | |
430e004e | 62 | FAST_TRACEPOINT_LABEL(set_point); |
06da0f77 PL |
63 | } |
64 | ||
65 | static void | |
66 | end (void) | |
67 | { | |
68 | } | |
69 | ||
70 | int | |
71 | main (int argc, char *argv[], char *envp[]) | |
72 | { | |
73 | pthread_t threads[NUM_THREADS]; | |
74 | int i; | |
75 | ||
76 | for (i = 0; i < NUM_THREADS; i++) | |
77 | pthread_create (&threads[i], NULL, thread_function, NULL); | |
78 | ||
79 | for (i = 0; i < NUM_THREADS; i++) | |
80 | pthread_join (threads[i], NULL); | |
81 | ||
82 | end (); | |
83 | ||
84 | return 0; | |
85 | } |