gdb/testsuite/gdb.threads/watchthreads2.exp

   1 # This testcase is part of GDB, the GNU debugger.
   2
   3 # Copyright 2009-2013 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
  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.
  27 if {[skip_hw_watchpoint_tests]} {
  28     return 0
  29 }
  30
  31 standard_testfile
  32 if {[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
  36 clean_restart ${binfile}
  37
  38 gdb_test_no_output "set can-use-hw-watchpoints 1" ""
  39
  40 #
  41 # Run to `main' where we begin our tests.
  42 #
  43
  44 if ![runto_main] then {
  45     gdb_suppress_tests
  46 }
  47
  48 gdb_test "break thread_started" \
  49          "Breakpoint 2 at .*: file .*${srcfile}, line .*" \
  50          "breakpoint on thread_started"
  51
  52 # Run the program until all threads have hit thread_started.
  53 # We use this as the vehicle to determine when gdb is aware
  54 # of all threads (i.e. "info threads" would show all threads).
  55
  56 set nr_started 0
  57 set message "run to thread_started"
  58 for { set i 0 } { $i < $NR_THREADS } { incr i } {
  59     gdb_test_multiple "continue" $message {
  60         -re ".*Breakpoint 2, thread_started ().*$gdb_prompt $" {
  61             incr nr_started
  62         }
  63         timeout {
  64             set i $NR_THREADS
  65         }
  66     }
  67 }
  68 if { $nr_started == $NR_THREADS } {
  69     pass "all threads started"
  70 } else {
  71     fail "all threads started"
  72     # No point in continuing.
  73     return -1
  74 }
  75
  76 # Watch X, it will be modified by all threads.
  77 # We want this watchpoint to be set *after* all threads are running.
  78 gdb_test "watch x" "Hardware watchpoint 3: x"
  79
  80 # Now that the watchpoint is set, we can let the threads increment X.
  81 gdb_test_no_output "set var test_ready = 1"
  82
  83 # While debugging.
  84 #gdb_test_no_output "set debug infrun 1"
  85
  86 set x_inc_line [gdb_get_line_number "X increment"]
  87 set x_thread_loc "thread_function \\\(arg=.*\\\) at .*watchthreads.c:$x_inc_line"
  88
  89 # X is incremented under a mutex, so we should get NR_THREADS * X_INCR_COUNT
  90 # hits.
  91 set limit [expr $NR_THREADS*$X_INCR_COUNT]
  92 set x_count 0
  93 set done 0
  94
  95 set message "x watch loop"
  96
  97 for {set i 0} {!$done && $i < $limit} {incr i} {
  98     set test_flag 0
  99
 100     gdb_test_multiple "continue" $message {
 101         -re "(.*Hardware watchpoint.*)$gdb_prompt $" {
 102             set string $expect_out(1,string)
 103
 104             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" $string] {
 105                 incr x_count
 106                 set test_flag 1
 107             } else {
 108                 # We test for new value = old value + 1 each iteration.
 109                 # This can fail due to gdb/10116.
 110                 # This is caught after the loop exits.
 111             }
 112         }
 113         -re "The program is not being run.*$gdb_prompt $" {
 114             fail "$message (program terminated)"
 115         }
 116     }
 117
 118     # If we fail above, don't bother continuing loop.
 119     if { $test_flag == 0 } {
 120         set done 1
 121     }
 122 }
 123
 124 if { $i == $limit } {
 125     pass "all threads incremented x"
 126 } else {
 127     kfail "gdb/10116" "gdb can drop watchpoints in multithreaded app"
 128 }