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863d01bd PA |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
3 | Copyright 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 | #include <assert.h> | |
19 | #include <pthread.h> | |
20 | #include <unistd.h> | |
21 | #include <stdio.h> | |
22 | #include <sys/types.h> | |
23 | #include <sys/wait.h> | |
24 | #include <stdlib.h> | |
25 | ||
26 | /* Number of threads. Each thread continuously spawns a fork and wait | |
27 | for it. If we have another thread continuously start a step over, | |
28 | gdbserver should end up finding new forks while suspending | |
29 | threads. */ | |
30 | #define NTHREADS 10 | |
31 | ||
32 | pthread_t threads[NTHREADS]; | |
33 | ||
34 | pthread_barrier_t barrier; | |
35 | ||
36 | #define NFORKS 10 | |
37 | ||
38 | /* Used to create a conditional breakpoint that always fails. */ | |
39 | volatile int zero; | |
40 | ||
41 | static void * | |
42 | thread_forks (void *arg) | |
43 | { | |
44 | int i; | |
45 | ||
46 | pthread_barrier_wait (&barrier); | |
47 | ||
48 | for (i = 0; i < NFORKS; i++) | |
49 | { | |
50 | pid_t pid; | |
51 | ||
52 | pid = fork (); | |
53 | ||
54 | if (pid > 0) | |
55 | { | |
56 | int status; | |
57 | ||
58 | /* Parent. */ | |
59 | pid = waitpid (pid, &status, 0); | |
60 | if (pid == -1) | |
61 | { | |
62 | perror ("wait"); | |
63 | exit (1); | |
64 | } | |
65 | ||
66 | if (!WIFEXITED (status)) | |
67 | { | |
68 | printf ("Unexpected wait status 0x%x from child %d\n", | |
69 | status, pid); | |
70 | } | |
71 | } | |
72 | else if (pid == 0) | |
73 | { | |
74 | /* Child. */ | |
75 | exit (0); | |
76 | } | |
77 | else | |
78 | { | |
79 | perror ("fork"); | |
80 | exit (1); | |
81 | } | |
82 | } | |
83 | } | |
84 | ||
85 | /* Set this to tell the thread_breakpoint thread to exit. */ | |
86 | volatile int break_out; | |
87 | ||
88 | static void * | |
89 | thread_breakpoint (void *arg) | |
90 | { | |
91 | pthread_barrier_wait (&barrier); | |
92 | ||
93 | while (!break_out) | |
94 | { | |
95 | usleep (1); /* set break here */ | |
96 | } | |
97 | ||
98 | return NULL; | |
99 | } | |
100 | ||
101 | pthread_barrier_t barrier; | |
102 | ||
103 | int | |
104 | main (void) | |
105 | { | |
106 | int i; | |
107 | int ret; | |
108 | pthread_t bp_thread; | |
109 | ||
110 | /* Don't run forever. */ | |
111 | alarm (180); | |
112 | ||
113 | pthread_barrier_init (&barrier, NULL, NTHREADS + 1); | |
114 | ||
115 | /* Start the threads that constantly fork. */ | |
116 | for (i = 0; i < NTHREADS; i++) | |
117 | { | |
118 | ret = pthread_create (&threads[i], NULL, thread_forks, NULL); | |
119 | assert (ret == 0); | |
120 | } | |
121 | ||
122 | /* Start the thread that constantly hit a conditional breakpoint | |
123 | that needs to be stepped over. */ | |
124 | ret = pthread_create (&bp_thread, NULL, thread_breakpoint, NULL); | |
125 | assert (ret == 0); | |
126 | ||
127 | /* Wait for forking to stop. */ | |
128 | for (i = 0; i < NTHREADS; i++) | |
129 | { | |
130 | ret = pthread_join (threads[i], NULL); | |
131 | assert (ret == 0); | |
132 | } | |
133 | ||
134 | break_out = 1; | |
135 | pthread_join (bp_thread, NULL); | |
136 | assert (ret == 0); | |
137 | ||
138 | return 0; | |
139 | } |