testsuite/gdb.threads/break-while-running.exp

# Copyright (C) 2014-2023 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/>.

# Test that:
#
# - setting a breakpoint while a thread is running results in the
#   breakpoint being inserted immediately.
#
# - if breakpoint always-inserted mode is off, GDB doesn't remove
#   breakpoints from the target when a thread stops, if there are
#   still threads running.

standard_testfile

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

# The test proper.  UPDATE_THREAD_LIST indicates whether we should do
# an "info threads" to sync the thread list after the first stop.
# ALWAYS_INSERTED indicates whether testing in "breakpoint
# always-inserted" mode.  NON_STOP indicates whether we're testing in
# non-stop, or all-stop mode.

proc test { update_thread_list always_inserted non_stop } {
    global srcfile binfile
    global gdb_prompt
    global decimal

    clean_restart $binfile

    gdb_test_no_output "set non-stop $non_stop"
    gdb_test_no_output "set breakpoint always-inserted $always_inserted"

    if ![runto_main] {
	return -1
    }

    # In all-stop, check whether we're testing with the remote or
    # extended-remote targets.  If so, skip the tests, as with the
    # RSP, we can't issue commands until the target replies to vCont.
    # Not an issue with the non-stop RSP variant, which has a
    # non-blocking vCont.
    if {$non_stop=="off" && [gdb_is_target_remote]} {
	return -1
    }

    gdb_breakpoint [gdb_get_line_number "set wait-thread breakpoint here"]
    gdb_continue_to_breakpoint "run to wait-thread breakpoint"

    delete_breakpoints

    # Leave the main thread stopped, so GDB can poke at memory freely.
    if {$non_stop == "off"} {
	gdb_test_no_output "set scheduler-locking on"
	gdb_test "thread 2" "Switching to .*"
	gdb_test "continue &" "Continuing\." "continuing thread 2"
	gdb_test "thread 3" "Switching to .*"
	gdb_test "continue &" "Continuing\." "continuing thread 3"
	gdb_test "thread 1" "Switching to .*" "switch back to main thread"
    }

    # Test with and without pulling the thread list explicitly with
    # "info threads".  GDB should be able to figure out itself whether
    # the target is running and thus breakpoints should be inserted,
    # without the user explicitly fetching the thread list.
    if {$update_thread_list} {
	gdb_test "info threads" \
	    "main .*\\\(running\\\).*\\\(running\\\).*" \
	    "only main stopped"
    }

    # Don't use gdb_test as it's racy in this case -- gdb_test matches
    # the prompt with an end anchor.  Sometimes expect will manage to
    # read the breakpoint hit output while still processing this test,
    # defeating the anchor.
    set test "set breakpoint while a thread is running"
    gdb_test_multiple "break breakpoint_function" $test {
	-re "Breakpoint $decimal at .*: file .*$srcfile.*\r\n$gdb_prompt " {
	    pass $test
	}
	-re "$gdb_prompt " {
	    fail $test
	}
    }

    # Check that the breakpoint is hit.  Can't use gdb_test here, as
    # no prompt is expected to come out.
    set test "breakpoint is hit"
    gdb_test_multiple "" $test {
	-re "Breakpoint .*, breakpoint_function \[^\r\n\]+" {
	    pass $test
	}
    }

    if {$non_stop == "on"} {
	gdb_test "info threads" \
	    "main .* breakpoint_function .*\\\(running\\\)" \
	    "one thread running"

	# Unblock the other thread, which should then trip on the same
	# breakpoint, unless GDB removed it by mistake.  Can't use
	# gdb_test here for the same reasons as above.
	set test "unblock second thread"
	gdb_test_multiple "print second_child = 1" $test {
	    -re " = 1\r\n$gdb_prompt " {
		pass $test
	    }
	    -re "$gdb_prompt " {
		fail $test
	    }
	}

	set test "breakpoint on second child is hit"
	gdb_test_multiple "" $test {
	    -re "Breakpoint .*, breakpoint_function \[^\r\n\]+" {
		pass $test
	    }
	}

	gdb_test "info threads" \
	    " main .* breakpoint_function .* breakpoint_function .*" \
	    "all threads stopped"
    } else {
	# This test is not merged with the non-stop one because in
	# all-stop we don't know where the other thread stops (inside
	# usleep, for example).
	set test "all threads stopped"
	gdb_test_multiple "info threads" "$test" {
	    -re "\\\(running\\\).*$gdb_prompt $" {
		fail $test
	    }
	    -re "main .* breakpoint_function .*$gdb_prompt $" {
		pass $test
	    }
	}
    }
}

foreach update_thread_list { true false } {
    foreach always_inserted { "off" "on" } {
	foreach non_stop { "off" "on" } {
	    set stop_mode [expr ($non_stop=="off")?"all-stop":"non-stop"]
	    set update_list_mode [expr ($update_thread_list)?"w/ithr":"wo/ithr"]
	    with_test_prefix "$update_list_mode: always-inserted $always_inserted: $stop_mode" {
		test $update_thread_list $always_inserted $non_stop
	    }
	}
    }
}