# Copyright (C) 2003 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

# This file was written by Joel Brobecker.
#
# It verifies that GDB is able to compute a backtrace for a thread
# being blocked on a call to pthread_cond_wait(). 

if $tracelevel then {
	strace $tracelevel
}

set testfile "pt"
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_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}

gdb_test "break break_me" \
         "Breakpoint 1 at .*: file .*pt.c, line .*" \
         "breakpoint on break_me"

gdb_test "run" \
         ".*Breakpoint 1, break_me ().*" \
         "run to break_me"

# Depending on the thread implementation (Linux Threads, NPTL, etc...),
# The number of threads known to GDB may vary. We should have at least
# two threads, but we may have more. We want to switch to the pthread
# we created via pthread_create, and its ID should be the highest ID
# of all threads known to GDB.
set thread_id ""
send_gdb "info threads\n"
gdb_expect {
    -re "\s*(\[0-9\]+) Thread.*$gdb_prompt $" {
        set thread_id $expect_out(1,string)
    }
    default {
        fail "Unable to find thread id, defaulting to 2"
        set thread_id "2"
    }
}
    

# Switch to thread 2, which is doing a forever wait...
gdb_test "thread $thread_id" \
         ".*Switching to thread $thread_id.*" \
         "switching to thread $thread_id"

# Verify that we are able to get a sensible backtrace, including
# the frame for the pthread_cond_wait() call.
gdb_test "backtrace" \
         ".*pthread_cond_wait.*cond_wait.*noreturn.*forever_pthread.*" \
         "backtrace in blocked thread"