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# 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 .

# Test GDB can cope with two watchpoints being hit by different threads at the

# same time, GDB reports one of them and after "continue" to report the other

# one GDB should not be confused by differently set watchpoints that time.

# This is the goal of "reorder1".  "reorder0" tests the basic functionality of

# two watchpoints being hit at the same time, without reordering them during the

# stop.  The formerly broken functionality is due to the all-stop mode default

# "show breakpoint always-inserted" being "off".  Formerly the remembered hit

# could be assigned during continuation of a thread with pending SIGTRAP to the

# different/new watchpoint, just based on the watchpoint/debug register number.

if {(![istarget "i?86-*-*"] && ![istarget "x86_64-*-*"]

     && ![istarget "ia64-*-*"])

    || [target_info exists gdb,no_hardware_watchpoints]

    || ![istarget *-*-linux*]} {

    return 0

}

set testfile "watchthreads-reorder"

set srcfile ${testfile}.c

set binfile ${objdir}/${subdir}/${testfile}

if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" ${binfile} executable [list debug additional_flags=-lrt]] != "" } {

    return -1

}

foreach reorder {0 1} {

    global pf_prefix

    set prefix_test $pf_prefix

    lappend pf_prefix "reorder$reorder:"

    clean_restart $testfile

    gdb_test "set can-use-hw-watchpoints 1"

    if ![runto_main] {

        return -1

    }

    # Use "rwatch" as "watch" would report the watchpoint changed just based on its

    # read memory value during a stop by unrelated event.  We are interested in not

    # losing the hardware watchpoint trigger.

    gdb_test "rwatch thread1_rwatch" "Hardware read watchpoint \[0-9\]+: thread1_rwatch"

    set test "rwatch thread2_rwatch"

    gdb_test_multiple $test $test {

        -re "Target does not support this type of hardware watchpoint\\.\r\n$gdb_prompt $" {

            # ppc64 supports at most 1 hw watchpoints.

            unsupported $test

            return

        }

        -re "Hardware read watchpoint \[0-9\]+: thread2_rwatch\r\n$gdb_prompt $" {

            pass $test

        }

    }

    gdb_breakpoint [gdb_get_line_number "break-at-exit"]

    # The watchpoints can happen in arbitrary order depending on random:

    # SEL: Found 2 SIGTRAP events, selecting #[01]

    # As GDB contains no srand() on the specific host/OS it will behave always the

    # same.  Such order cannot be guaranteed for GDB in general.

    gdb_test "continue" \

             "Hardware read watchpoint \[0-9\]+: thread\[12\]_rwatch\r\n\r\nValue = 0\r\n0x\[0-9a-f\]+ in thread\[12\]_func .*" \

             "continue a"

    if $reorder {

        # GDB orders watchpoints by their addresses so inserting new variables

        # with lower addresses will shift the former watchpoints to higher

        # debug registers.

        gdb_test "rwatch unused1_rwatch" "Hardware read watchpoint \[0-9\]+: unused1_rwatch"

        gdb_test "rwatch unused2_rwatch" "Hardware read watchpoint \[0-9\]+: unused2_rwatch"

    }

    gdb_test "continue" \

             "Hardware read watchpoint \[0-9\]+: thread\[12\]_rwatch\r\n\r\nValue = 0\r\n0x\[0-9a-f\]+ in thread\[12\]_func .*" \

             "continue b"

    # While the debug output itself is not checked in this testcase one bug was

    # found in the DEBUG_INFRUN code path.

    gdb_test "set debug infrun 1"

    gdb_continue_to_breakpoint "break-at-exit" ".*break-at-exit.*"

    set pf_prefix $prefix_test

}