# 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 } set prms_id 0 set bug_id 0 # 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 ${binfile} gdb_test "set can-use-hw-watchpoints 1" "" "" # # Run to `main' where we begin our tests. # if ![runto_main] then { gdb_suppress_tests } gdb_test "break thread_started" \ "Breakpoint 2 at .*: file .*${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 "set var test_ready = 1" "" # While debugging. #gdb_test "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" }