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# This testcase is part of GDB, the GNU debugger.
# Copyright 2009-2019 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
# 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 {[skip_hw_watchpoint_tests]} {
return 0
}
standard_testfile
if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "additional_flags=-DNR_THREADS=$NR_THREADS -DX_INCR_COUNT=$X_INCR_COUNT"]] != "" } {
return -1
}
clean_restart ${binfile}
gdb_test_no_output "set can-use-hw-watchpoints 1" ""
#
# Run to `main' where we begin our tests.
#
if ![runto_main] then {
fail "can't run to main"
return 0
}
gdb_test "break thread_started" \
"Breakpoint 2 at .*: file .*${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"
}
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