gdb/testsuite/gdb.threads/watchthreads2.exp

   1 # This testcase is part of GDB, the GNU debugger.
   2
   3 # Copyright 2009, 2010 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
  21 set NR_THREADS 4
  22 set X_INCR_COUNT 10
  23
  24 if $tracelevel {
  25     strace $tracelevel
  26 }
  27
  28 set prms_id 0
  29 set bug_id 0
  30
  31 # This test verifies that a watchpoint is detected in the proper thread
  32 # so the test is only meaningful on a system with hardware watchpoints.
  33 if [target_info exists gdb,no_hardware_watchpoints] {
  34     return 0;
  35 }
  36
  37 set testfile "watchthreads2"
  38 set srcfile ${testfile}.c
  39 set binfile ${objdir}/${subdir}/${testfile}
  40 if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "incdir=${objdir}" "additional_flags=-DNR_THREADS=$NR_THREADS -DX_INCR_COUNT=$X_INCR_COUNT"]] != "" } {
  41     return -1
  42 }
  43
  44 gdb_exit
  45 gdb_start
  46 gdb_reinitialize_dir $srcdir/$subdir
  47 gdb_load ${binfile}
  48
  49 gdb_test "set can-use-hw-watchpoints 1" "" ""
  50
  51 #
  52 # Run to `main' where we begin our tests.
  53 #
  54
  55 if ![runto_main] then {
  56     gdb_suppress_tests
  57 }
  58
  59 gdb_test "break thread_started" \
  60          "Breakpoint 2 at .*: file .*${srcfile}, line .*" \
  61          "breakpoint on thread_started"
  62
  63 # Run the program until all threads have hit thread_started.
  64 # We use this as the vehicle to determine when gdb is aware
  65 # of all threads (i.e. "info threads" would show all threads).
  66
  67 set nr_started 0
  68 set message "run to thread_started"
  69 for { set i 0 } { $i < $NR_THREADS } { incr i } {
  70     gdb_test_multiple "continue" $message {
  71         -re ".*Breakpoint 2, thread_started ().*$gdb_prompt $" {
  72             incr nr_started
  73         }
  74         timeout {
  75             set i $NR_THREADS
  76         }
  77     }
  78 }
  79 if { $nr_started == $NR_THREADS } {
  80     pass "all threads started"
  81 } else {
  82     fail "all threads started"
  83     # No point in continuing.
  84     return -1
  85 }
  86
  87 # Watch X, it will be modified by all threads.
  88 # We want this watchpoint to be set *after* all threads are running.
  89 gdb_test "watch x" "Hardware watchpoint 3: x"
  90
  91 # Now that the watchpoint is set, we can let the threads increment X.
  92 gdb_test "set var test_ready = 1" ""
  93
  94 # While debugging.
  95 #gdb_test "set debug infrun 1" ""
  96
  97 set x_inc_line [gdb_get_line_number "X increment"]
  98 set x_thread_loc "thread_function \\\(arg=.*\\\) at .*watchthreads.c:$x_inc_line"
  99
 100 # X is incremented under a mutex, so we should get NR_THREADS * X_INCR_COUNT
 101 # hits.
 102 set limit [expr $NR_THREADS*$X_INCR_COUNT]
 103 set x_count 0
 104 set done 0
 105
 106 set message "x watch loop"
 107
 108 for {set i 0} {!$done && $i < $limit} {incr i} {
 109     set test_flag 0
 110
 111     gdb_test_multiple "continue" $message {
 112         -re "(.*Hardware watchpoint.*)$gdb_prompt $" {
 113             set string $expect_out(1,string)
 114
 115             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" $string] {
 116                 incr x_count
 117                 set test_flag 1
 118             } else {
 119                 # We test for new value = old value + 1 each iteration.
 120                 # This can fail due to gdb/10116.
 121                 # This is caught after the loop exits.
 122             }
 123         }
 124         -re "The program is not being run.*$gdb_prompt $" {
 125             fail "$message (program terminated)"
 126         }
 127     }
 128
 129     # If we fail above, don't bother continuing loop.
 130     if { $test_flag == 0 } {
 131         set done 1
 132     }
 133 }
 134
 135 if { $i == $limit } {
 136     pass "all threads incremented x"
 137 } else {
 138     kfail "gdb/10116" "gdb can drop watchpoints in multithreaded app"
 139 }