[RFC] New thread testcase.

[Manoj Iyer <manjo@austin.ibm.com>]

[-- Attachment #1: Type: TEXT/PLAIN, Size: 1003 bytes --]


Please find attached a new thread test that tests GDB functions like
break, step etc from a thread function. This testcase uncovered a problem
in GDB32 on ppc64 machine due to a generic kernel bug in ptrace().

For example:

(gdb) break tf
Breakpoint 2 at 0x10000594: file tbug.c, line 15.
(gdb) run
Starting program: /home/public/test-tools/gdb/tbug
[Thread debugging using libthread_db enabled]
[New Thread 1074020384 (LWP 26710)]
reading register pc (#64): No such process.
(gdb) cont
Continuing.
reading register pc (#64): No such process.
(gdb) cont
Continuing.
reading register pc (#64): No such process.
(gdb) cont
Continuing.
reading register pc (#64): No such process.
(gdb) quit
The program is running.  Exit anyway? (y or n) y

Thanks
----- ----
Manoj Iyer
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Cognito ergo sum                                                          +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

[-- Attachment #2: C program --]
[-- Type: TEXT/x-csrc, Size: 1906 bytes --]

/*
* Copyright (C) 2004 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@prep.ai.mit.edu

* This file was written by Steve Munroe. (sjmunroe@us.ibm.com)
* Test break points and single step on thread functions.
*/

#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>

#define N       2

static void *
tf (void *arg)
{
    int n = (int) (long int) arg;
    char number[160];
    sprintf(number, "tf(%ld): begin", (long)arg);
    puts (number);

    sleep (100);
    sprintf(number, "tf(%ld): end", (long)arg);
    puts (number);
    return NULL;
}

int main (int argc, char *argv[])
{
    int n;
    pthread_t th[N];

    for (n = 0; n < N; ++n)
    if (pthread_create (&th[n], NULL, tf, (void *) (long int) n) != 0)
    {
        sleep(2);
        puts ("create failed");
        exit (1);
    }

    puts("after create");

    for (n = 0; n < N; ++n)
    if (pthread_join (th[n], NULL) != 0)
    {
        puts ("join failed");
        exit (1);
    }

    puts("after join");
              return 0;
}

[-- Attachment #3: expect script --]
[-- Type: TEXT/PLAIN, Size: 3735 bytes --]

# Copyright (C) 2004 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@prep.ai.mit.edu

# This file was written by Manoj Iyer. (manjo@austin.ibm.com)
# Test break points and single step on thread functions.
# 
# Test Purpose:
# - Test that breakpoints, single step, and bracktrace works on a threaded 
#   application. On ppc64 system this test is known to fail due to kernel bug 
#   in ptrace system call.
#
# Test Strategy:
# - tbug.c creates 2 threads
# - start gdb 
# - create 2 breakpoints #1 main() #2 tf() (the thread function)
# - run gdb till #1 main() breakpoint is reached
# - continue to breakpoint #2 tf()
# - single step to first instruction in the thread function tf()
# - backtrace from thread function tf()
# - delete all breakpoints 
# - exit gdb.

if $tracelevel then {
        strace $tracelevel
}

set prms_id 0
set bug_id 0

set testfile "tbug"
set srcfile ${testfile}.c
set binfile ${objdir}/${subdir}/${testfile}

if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "incdir=${objdir}"]] != "" } {
    return -1
}

gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}

if ![runto_main] then {
   fail "Can't run to main"
      return 1;
}

#
# set breakpoint at thread fucntion tf
#
gdb_test "break tf" \
    "Breakpoint.*at.* file .*$srcfile, line.*" \
    "breakpoint tf"


#
#
# continue to tf() breakpoint #2
#
send_gdb "continue\n"
gdb_expect {
    -re ".*Breakpoint 2.*tf.* at .*tbug.* .*\r\n$gdb_prompt $" {
        pass "continue to tf";
    }
    -re ".*$gdb_prompt $" {
        fail "continue to tf";
        return 1;
    }
    timeout {
        fail "continue to tf (timeout)";
        return 1;
    }
}

#
# step through the thread function.
#
send_gdb "step\n"
gdb_expect {
    -re "39.*sprintf.* .*\r\n$gdb_prompt $" {
        pass "step to next instruction in tf";
    }
    -re ".*$gdb_prompt $" {
        fail "step to next instruction in tf";
        return 1;
    }
    timeout {
        fail "step to next instruction in tf (timeout)";
        return 1;
    }
}

#
# backtrace from thread function. 
#
send_gdb "backtrace\n"
gdb_expect {
    -re ".*3.* .*0x.* in clone.* from .*libc.*$" {
        pass "backtrace from thread function";
    }
    -re ".*$gdb_prompt $" {
        fail "backtrace from thread function";
        return 1;
    }
    timeout {
        fail "backtrace from thread function (timeout)";
        return 1;
    }
}

#
# delete all breakpoints
#
send_gdb "delete\n"
gdb_expect 100 {         
    -re "Delete all breakpoints.*$" {
        send_gdb "y\n";
        exp_continue
    }
    -re ".*$gdb_prompt $" {
        # no more breakpoints then do nothing
    }
    timeout { 
        perror "Delete all breakpoints in delete_breakpoints (timeout)"; 
        return 0;
    }
}

#
# exit gdb
#
gdb_exit