1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
# This testcase is part of GDB, the GNU debugger.
# Copyright 2009, 2010 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Check that watchpoints get propagated to all existing threads when the
# watchpoint is created.
set NR_THREADS 4
set X_INCR_COUNT 10
if $tracelevel {
strace $tracelevel
}
# This test verifies that a watchpoint is detected in the proper thread
# so the test is only meaningful on a system with hardware watchpoints.
if [target_info exists gdb,no_hardware_watchpoints] {
return 0;
}
set testfile "watchthreads2"
set srcfile ${testfile}.c
set binfile ${objdir}/${subdir}/${testfile}
if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "incdir=${objdir}" "additional_flags=-DNR_THREADS=$NR_THREADS -DX_INCR_COUNT=$X_INCR_COUNT"]] != "" } {
return -1
}
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}
gdb_test_no_output "set can-use-hw-watchpoints 1" ""
#
# Run to `main' where we begin our tests.
#
if ![runto_main] then {
gdb_suppress_tests
}
gdb_test "break thread_started" \
"Breakpoint 2 at .*: file .*${srcfile}, line .*" \
"breakpoint on thread_started"
# Run the program until all threads have hit thread_started.
# We use this as the vehicle to determine when gdb is aware
# of all threads (i.e. "info threads" would show all threads).
set nr_started 0
set message "run to thread_started"
for { set i 0 } { $i < $NR_THREADS } { incr i } {
gdb_test_multiple "continue" $message {
-re ".*Breakpoint 2, thread_started ().*$gdb_prompt $" {
incr nr_started
}
timeout {
set i $NR_THREADS
}
}
}
if { $nr_started == $NR_THREADS } {
pass "all threads started"
} else {
fail "all threads started"
# No point in continuing.
return -1
}
# Watch X, it will be modified by all threads.
# We want this watchpoint to be set *after* all threads are running.
gdb_test "watch x" "Hardware watchpoint 3: x"
# Now that the watchpoint is set, we can let the threads increment X.
gdb_test_no_output "set var test_ready = 1"
# While debugging.
#gdb_test_no_output "set debug infrun 1"
set x_inc_line [gdb_get_line_number "X increment"]
set x_thread_loc "thread_function \\\(arg=.*\\\) at .*watchthreads.c:$x_inc_line"
# X is incremented under a mutex, so we should get NR_THREADS * X_INCR_COUNT
# hits.
set limit [expr $NR_THREADS*$X_INCR_COUNT]
set x_count 0
set done 0
set message "x watch loop"
for {set i 0} {!$done && $i < $limit} {incr i} {
set test_flag 0
gdb_test_multiple "continue" $message {
-re "(.*Hardware watchpoint.*)$gdb_prompt $" {
set string $expect_out(1,string)
if [regexp "Hardware watchpoint 3: x\[^\r\]*\r\[^\r\]*\r\[^\r\]*Old value = $x_count\[^\r\]*\r\[^\r\]*New value = [expr $x_count+1]\r" $string] {
incr x_count
set test_flag 1
} else {
# We test for new value = old value + 1 each iteration.
# This can fail due to gdb/10116.
# This is caught after the loop exits.
}
}
-re "The program is not being run.*$gdb_prompt $" {
fail "$message (program terminated)"
}
}
# If we fail above, don't bother continuing loop.
if { $test_flag == 0 } {
set done 1
}
}
if { $i == $limit } {
pass "all threads incremented x"
} else {
kfail "gdb/10116" "gdb can drop watchpoints in multithreaded app"
}
|
