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# Copyright (C) 1999 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 2 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, write to the Free Software

# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

# Please email any bugs, comments, and/or additions to this file to:

# bug-gdb@gnu.org

#### Dining Philosophers, on LinuxThreads - Jim Blandy 

####

#### At the moment, GDB's support for LinuxThreads is pretty

#### idiosyncratic --- GDB's output doesn't look much like the output

#### it produces for other thread implementations, messages appear at

#### different times, etc.  So these tests are specific to LinuxThreads.

####

#### However, if all goes well, Linux will soon have a libthread_db

#### interface, and GDB will manage it the same way it does other

#### libthread_db-based systems.  Then, we can adjust this file to

#### work with any such system.

### Other things we ought to test:

### stepping a thread while others are running

### killing and restarting

### quitting gracefully

if $tracelevel then {

        strace $tracelevel

}

set prms_id 0

set bug_id 0

# This only works with Linux configurations.

if ![istarget *-*-linux-gnu] then {

    return

}

set testfile "linux-dp"

set srcfile ${testfile}.c

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

if {[gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug libs=-lpthread}] != ""} {

    gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."

}

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

send_gdb "set print sevenbit-strings\n" ; gdb_expect -re "$gdb_prompt $"

runto_main

# There should be no threads initially.

gdb_test "info threads" "" "info threads 1"

# Try stepping over the thread creation function.

gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: create philosopher"]

for {set i 0} {$i < 5} {incr i} {

    gdb_continue_to_breakpoint "about to create philosopher: $i"

    send_gdb "next\n"

    gdb_expect {

        -re "\\\[New .*\\\].*$gdb_prompt $" {

            pass "create philosopher: $i"

        }

        -re "Program received signal.*(Unknown signal|SIGUSR).*$gdb_prompt $" {

            # It would be nice if we could catch the message that GDB prints

            # when it first notices that the thread library doesn't support

            # debugging, or if we could explicitly ask GDB somehow.

            unsupported "This GDB does not support threads on this system."

            return -1

        }

        -re "$gdb_prompt $" {

            fail "create philosopher: $i"

        }

        timeout {

            fail "(timeout) create philosopher: $i"

        }

    }

}

# Run until there are some threads.

gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: info threads 2"]

gdb_continue_to_breakpoint "main thread's sleep"

gdb_test "info threads" "7 Thread .*6 Thread .*5 Thread .*4 Thread .*3 Thread .*2 Thread .*1 Thread .*" "info threads 2"

# Try setting a thread-specific breakpoint.

gdb_breakpoint "print_philosopher thread 5"

gdb_continue_to_breakpoint "thread 5's print"

gdb_test "where" "print_philosopher.*philosopher.*pthread_start_thread.*" \

        "first thread-specific breakpoint hit"

# Make sure it's catching the right thread.  Try hitting the

# breakpoint ten times, and make sure we don't get anyone else.

set only_five 1

for {set i 0} {$only_five > 0 && $i < 10} {incr i} {

    gdb_continue_to_breakpoint "thread 5's print, pass: $i"

    send_gdb "info threads\n"

    gdb_expect {

        -re "\\* 5 Thread .*  print_philosopher .*\r\n$gdb_prompt $" {

            # Okay this time.

        }

        -re ".*$gdb_prompt $" {

            set only_five 0

        }

        timeout {

            set only_five -1

        }

    }

}

set name "thread-specific breakpoint is thread-specific"

if {$only_five ==  1} { pass $name }

if {$only_five ==  0} { fail $name }

if {$only_five == -1} { fail "$name (timeout)" }

### Select a particular thread.

proc select_thread {thread} {

    global gdb_prompt

    send_gdb "thread $thread\n"

    gdb_expect {

        -re "\\\[Switching to thread .*\\\].*\r\n$gdb_prompt $" {

            pass "selected thread: $thread"

        }

        -re "$gdb_prompt $" {

            fail "selected thread: $thread"

        }

        timeout {

            fail "selected thread: $thread (timeout)"

        }

    }

}

### Select THREAD, check for a plausible backtrace, and make sure

### we're actually selecting a different philosopher each time.

### Return true if the thread had a stack which was not only

### acceptable, but interesting.  SEEN should be an array in which

### SEEN(N) exists iff we have found philosopher number N before.

proc check_philosopher_stack {thread seen_name} {

    global gdb_prompt

    upvar $seen_name seen

    set name "philosopher is distinct: $thread"

    set interesting 0

    select_thread $thread

    send_gdb "where\n"

    gdb_expect {

        -re ".* in philosopher \\(data=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" {

            set data $expect_out(1,string)

            if {[info exists seen($data)]} {

                fail $name

            } else {

                pass $name

                set seen($data) yep

            }

            set interesting 1

        }

        -re "pthread_start_thread.*\r\n$gdb_prompt $" {

            ## Maybe the thread hasn't started yet.

            pass $name

        }

        -re " in \\?\\?.*\r\n$gdb_prompt $" {

            ## Sometimes we can't get a backtrace.  I'm going to call

            ## this a pass, since we do verify that at least one

            ## thread was interesting, so we can get more consistent

            ## test suite totals.  But in my heart, I think it should

            ## be an xfail.

            pass $name

        }

        -re "$gdb_prompt $" {

            fail $name

        }

        timeout {

            fail "$name (timeout)"

        }

    }

    return $interesting

}

set any_interesting 0

array set seen {}

for {set i 3} {$i <= 7} {incr i} {

    if [check_philosopher_stack $i seen] {

        set any_interesting 1

    }

}

if {$any_interesting} {

    pass "found an interesting thread"

} else {

    fail "found an interesting thread"

}