# This testcase is part of GDB, the GNU debugger.

# Copyright 2020-2021 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 receiving TARGET_WAITKIND_EXITED events from multiple
# inferiors.  In all stop-mode, upon receiving the exit event from one
# of the inferiors, GDB will try to stop the other inferior, too.  So,
# a stop request will be sent.  Receiving a TARGET_WAITKIND_EXITED
# status kind as a response to that stop request instead of a
# TARGET_WAITKIND_STOPPED should be handled by GDB without problems.

standard_testfile

if {[use_gdb_stub]} {
    return 0
}

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

# We are testing GDB's ability to stop all threads.
# Hence, go with the all-stop-on-top-of-non-stop mode.
save_vars { GDBFLAGS } {
    append GDBFLAGS " -ex \"maint set target-non-stop on\""
    clean_restart ${binfile}
}

# Start inferior NUM.

proc start_inferior {num} {
    with_test_prefix "start_inferior $num" {
	global srcfile binfile

	if {$num != 1} {
	    gdb_test "add-inferior" "Added inferior $num.*" \
		"add empty inferior"
	    gdb_test "inferior $num" "Switching to inferior $num.*" \
		"switch to inferior"
	}

	gdb_load $binfile

	if {[gdb_start_cmd] < 0} {
	    fail "could not start"
	    return -1
	}
	gdb_test "" ".*reakpoint .*, main .*${srcfile}.*" "start"
    }

    return 0
}

# Sufficient inferiors to make sure that at least some other inferior
# exits while we're handling a process exit event.
set NUM_INFS 10

for {set i 1} {$i <= $NUM_INFS} {incr i} {
    if {[start_inferior $i] < 0} {
	return -1
    }
}

# We want to continue all processes.
gdb_test_no_output "set schedule-multiple on"

# Check that "continue" continues to the end of an inferior, as many
# times as we have inferiors.

for {set i 1} {$i <= $NUM_INFS} {incr i} {
    with_test_prefix "inf $i" {
	set live_inferior ""

	# Pick any live inferior.
	gdb_test_multiple "info inferiors" "" {
	    -re "($decimal) *process.*$gdb_prompt $" {
		set live_inferior $expect_out(1,string)
	    }
	}

	if {$live_inferior == ""} {
	    return -1
	}

	gdb_test "inferior $live_inferior" \
	    ".*Switching to inferior $live_inferior.*" \
	    "switch to another inferior"

	set exited_inferior ""

	# We want GDB to complete the command and return the prompt
	# instead of going into an infinite loop.
	gdb_test_multiple "continue" "continue" {
	    -re "Inferior ($decimal) \[^\n\r\]+ exited normally.*$gdb_prompt $" {
		set exited_inferior $expect_out(1,string)
		pass $gdb_test_name
	    }
	}

	if {$exited_inferior == ""} {
	    return -1
	}
    }
}

# Finally, check that we can re-run all inferiors.  Note that if any
# inferior was still alive this would catch it, as "run" would query
# "Start it from the beginning?".

delete_breakpoints

for {set i 1} {$i <= $NUM_INFS} {incr i} {
    with_test_prefix "inf $i" {
	gdb_test "inferior $i" \
	    ".*Switching to inferior $i.*" \
	    "switch to inferior for re-run"

	gdb_test "run" "$inferior_exited_re normally\]" \
	    "re-run inferior"
    }
}