1# This testcase is part of GDB, the GNU debugger. 2 3# Copyright 2009-2019 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# Check that watchpoints get propagated to all existing threads when the 19# watchpoint is created. 20 21set NR_THREADS 4 22set X_INCR_COUNT 10 23 24 25# This test verifies that a watchpoint is detected in the proper thread 26# so the test is only meaningful on a system with hardware watchpoints. 27if {[skip_hw_watchpoint_tests]} { 28 return 0 29} 30 31standard_testfile 32if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "additional_flags=-DNR_THREADS=$NR_THREADS -DX_INCR_COUNT=$X_INCR_COUNT"]] != "" } { 33 return -1 34} 35 36clean_restart ${binfile} 37 38gdb_test_no_output "set can-use-hw-watchpoints 1" "" 39 40# 41# Run to `main' where we begin our tests. 42# 43 44if ![runto_main] then { 45 fail "can't run to main" 46 return 0 47} 48 49gdb_test "break thread_started" \ 50 "Breakpoint 2 at .*: file .*${srcfile}, line .*" \ 51 "breakpoint on thread_started" 52 53# Run the program until all threads have hit thread_started. 54# We use this as the vehicle to determine when gdb is aware 55# of all threads (i.e. "info threads" would show all threads). 56 57set nr_started 0 58set message "run to thread_started" 59for { set i 0 } { $i < $NR_THREADS } { incr i } { 60 gdb_test_multiple "continue" $message { 61 -re ".*Breakpoint 2, thread_started ().*$gdb_prompt $" { 62 incr nr_started 63 } 64 timeout { 65 set i $NR_THREADS 66 } 67 } 68} 69if { $nr_started == $NR_THREADS } { 70 pass "all threads started" 71} else { 72 fail "all threads started" 73 # No point in continuing. 74 return -1 75} 76 77# Watch X, it will be modified by all threads. 78# We want this watchpoint to be set *after* all threads are running. 79gdb_test "watch x" "Hardware watchpoint 3: x" 80 81# Now that the watchpoint is set, we can let the threads increment X. 82gdb_test_no_output "set var test_ready = 1" 83 84# While debugging. 85#gdb_test_no_output "set debug infrun 1" 86 87set x_inc_line [gdb_get_line_number "X increment"] 88set x_thread_loc "thread_function \\\(arg=.*\\\) at .*watchthreads.c:$x_inc_line" 89 90# X is incremented under a mutex, so we should get NR_THREADS * X_INCR_COUNT 91# hits. 92set limit [expr $NR_THREADS*$X_INCR_COUNT] 93set x_count 0 94set done 0 95 96set message "x watch loop" 97 98for {set i 0} {!$done && $i < $limit} {incr i} { 99 set test_flag 0 100 101 gdb_test_multiple "continue" $message { 102 -re "(.*Hardware watchpoint.*)$gdb_prompt $" { 103 set string $expect_out(1,string) 104 105 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" $string] { 106 incr x_count 107 set test_flag 1 108 } else { 109 # We test for new value = old value + 1 each iteration. 110 # This can fail due to gdb/10116. 111 # This is caught after the loop exits. 112 } 113 } 114 -re "The program is not being run.*$gdb_prompt $" { 115 fail "$message (program terminated)" 116 } 117 } 118 119 # If we fail above, don't bother continuing loop. 120 if { $test_flag == 0 } { 121 set done 1 122 } 123} 124 125if { $i == $limit } { 126 pass "all threads incremented x" 127} else { 128 kfail "gdb/10116" "gdb can drop watchpoints in multithreaded app" 129} 130