binutils-gdb/gdb/testsuite/gdb.threads/forking-threads-plus-breakpoint.exp

# Copyright (C) 2015 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 <http://www.gnu.org/licenses/>.

# This test verifies that several threads forking while another thread
# is constantly stepping over a breakpoint is properly handled.

standard_testfile

set linenum [gdb_get_line_number "set break here"]

if {[build_executable "failed to prepare" $testfile $srcfile {debug pthreads}] == -1} {
    return -1
}

# The test proper.  If COND_BP_TARGET is true, then test with
# conditional breakpoints evaluated on the target side, if possible.
# DETACH_ON_FORK is used as value for the "set detach-on-fork"
# setting.  If "on", this exercises GDB explicitly continuing the fork
# child until exit.  If "off", this exercises GDB detaching the fork
# child.
proc do_test { cond_bp_target detach_on_fork } {
    global GDBFLAGS
    global srcfile testfile binfile
    global decimal gdb_prompt
    global linenum
    global is_remote_target

    set saved_gdbflags $GDBFLAGS
    set GDBFLAGS [concat $GDBFLAGS " -ex \"set non-stop on\""]
    clean_restart $binfile
    set GDBFLAGS $saved_gdbflags

    if ![runto_main] then {
	fail "Can't run to main"
	return 0
    }

    gdb_test_no_output "set detach-on-fork $detach_on_fork"

    gdb_test "break $linenum if zero == 1" \
	"Breakpoint .*" \
	"set breakpoint that evals false"

    set test "continue &"
    gdb_test_multiple $test $test {
	-re "$gdb_prompt " {
	    pass $test
	}
    }

    set fork_count 0
    set ok 0

    set test "inferior 1 exited"
    gdb_test_multiple "" $test {
	-re "Inferior 1 \(\[^\r\n\]+\) exited normally" {
	    set ok 1
	    pass $test
	}
	-re "Inferior $decimal \(\[^\r\n\]+\) exited normally" {
	    incr fork_count
	    if {$fork_count <= 100} {
		exp_continue
	    } else {
		fail "$test (too many forks)"
	    }
	}
    }

    if {!$ok} {
	# No use testing further.
	return
    }

    gdb_test "info threads" "No threads\." \
	"no threads left"

    gdb_test "info inferiors" \
	"Num\[ \t\]+Description\[ \t\]+Executable\[ \t\]+\r\n\\* 1 \[^\r\n\]+" \
	"only inferior 1 left"
}

# Wrapper for foreach that calls with_test_prefix on each iteration,
# including the iterator's current value in the prefix.

proc foreach_with_prefix {var list body} {
    upvar 1 $var myvar
    foreach myvar $list {
	with_test_prefix "$var=$myvar" {
	    uplevel 1 $body
	}
    }
}

foreach_with_prefix cond_bp_target {1 0} {
    foreach_with_prefix detach_on_fork {"on" "off"} {
	do_test $cond_bp_target $detach_on_fork

	# Disable "off" for now.  The test does pass with
	# detach-on-fork off (at the time of writing), but gdb seems
	# to slow down quadratically as inferiors are created, and
	# then the test takes annoyingly long to complete...
	break
    }
}