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aacbb8a5 LM |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
b811d2c2 | 3 | Copyright 2009-2020 Free Software Foundation, Inc. |
aacbb8a5 LM |
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 | Check that hardware watchpoints get correctly replicated to all | |
19 | existing threads when hardware watchpoints are created. This test | |
20 | creates one hardware watchpoint per thread until a maximum is | |
21 | reached. It originally addresses a deficiency seen on embedded | |
22 | powerpc targets with slotted hardware *point designs. | |
23 | */ | |
24 | ||
25 | #include <stdio.h> | |
26 | #include <unistd.h> | |
27 | #include <stdlib.h> | |
28 | #include <stdint.h> | |
29 | #include <pthread.h> | |
30 | ||
31 | #ifndef NR_THREADS | |
32 | #define NR_THREADS 4 /* Set by the testcase. */ | |
33 | #endif | |
34 | ||
35 | #ifndef X_INCR_COUNT | |
36 | #define X_INCR_COUNT 10 /* Set by the testcase. */ | |
37 | #endif | |
38 | ||
39 | void *thread_function (void *arg); /* Function executed by each thread. */ | |
40 | ||
41 | /* Used to hold threads back until wp-replication.exp is ready. */ | |
42 | int test_ready = 0; | |
43 | ||
44 | /* Used to hold threads back until every thread has had a chance of causing | |
45 | a watchpoint trigger. This prevents a situation in GDB where it may miss | |
46 | watchpoint triggers when threads exit while other threads are causing | |
47 | watchpoint triggers. */ | |
48 | int can_terminate = 0; | |
49 | ||
aacbb8a5 LM |
50 | /* Number of watchpoints GDB is capable of using (this is provided |
51 | by GDB during the test run). */ | |
52 | int hw_watch_count = 0; | |
53 | ||
54 | /* Array with elements we can create watchpoints for. */ | |
55 | static int watched_data[NR_THREADS]; | |
56 | pthread_mutex_t data_mutex; | |
57 | ||
aacbb8a5 LM |
58 | int |
59 | main () | |
60 | { | |
61 | int res; | |
62 | pthread_t threads[NR_THREADS]; | |
63 | int i; | |
64 | ||
aacbb8a5 LM |
65 | pthread_mutex_init (&data_mutex, NULL); |
66 | ||
67 | for (i = 0; i < NR_THREADS; i++) | |
68 | { | |
69 | res = pthread_create (&threads[i], | |
70 | NULL, thread_function, | |
71 | (void *) (intptr_t) i); | |
72 | if (res != 0) | |
73 | { | |
74 | fprintf (stderr, "error in thread %d create\n", i); | |
75 | abort (); | |
76 | } | |
77 | } | |
78 | ||
79 | for (i = 0; i < NR_THREADS; ++i) | |
80 | { | |
81 | res = pthread_join (threads[i], NULL); | |
82 | if (res != 0) | |
83 | { | |
84 | fprintf (stderr, "error in thread %d join\n", i); | |
85 | abort (); | |
86 | } | |
87 | } | |
88 | ||
89 | exit (EXIT_SUCCESS); | |
90 | } | |
91 | ||
92 | /* Easy place for a breakpoint. | |
93 | wp-replication.exp uses this to track when all threads are running | |
94 | instead of, for example, the program keeping track | |
95 | because we don't need the program to know when all threads are running, | |
96 | instead we need gdb to know when all threads are running. | |
97 | There is a delay between when a thread has started and when the thread | |
98 | has been registered with gdb. */ | |
99 | ||
100 | void | |
101 | thread_started (void) | |
102 | { | |
103 | } | |
104 | ||
105 | void * | |
106 | thread_function (void *arg) | |
107 | { | |
108 | int i, j; | |
109 | long thread_number = (long) arg; | |
110 | ||
111 | thread_started (); | |
112 | ||
113 | /* Don't start incrementing X until wp-replication.exp is ready. */ | |
114 | while (!test_ready) | |
115 | usleep (1); | |
116 | ||
117 | pthread_mutex_lock (&data_mutex); | |
118 | ||
119 | for (i = 0; i < NR_TRIGGERS_PER_THREAD; i++) | |
120 | { | |
121 | for (j = 0; j < hw_watch_count; j++) | |
122 | { | |
123 | /* For debugging. */ | |
124 | printf ("Thread %ld changing watch_thread[%d] data" | |
125 | " from %d -> %d\n", thread_number, j, | |
126 | watched_data[j], watched_data[j] + 1); | |
127 | /* Increment the watched data field. */ | |
128 | watched_data[j]++; | |
129 | } | |
130 | } | |
131 | ||
132 | pthread_mutex_unlock (&data_mutex); | |
133 | ||
134 | /* Hold the threads here to work around a problem GDB has evaluating | |
135 | watchpoints right when a DSO event shows up (PR breakpoints/10116). | |
136 | Sleep a little longer (than, say, 1, 5 or 10) to avoid consuming | |
137 | lots of cycles while the other threads are trying to execute the | |
138 | loop. */ | |
139 | while (!can_terminate) | |
140 | usleep (100); | |
141 | ||
142 | pthread_exit (NULL); | |
143 | } |