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- # Copyright 1999-2022 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/>.
- # Please email any bugs, comments, and/or additions to this file to:
- # bug-gdb@gnu.org
- #### Dining Philosophers, on LinuxThreads - Jim Blandy <jimb@cygnus.com>
- ####
- #### At the moment, GDB's support for LinuxThreads is pretty
- #### idiosyncratic --- GDB's output doesn't look much like the output
- #### it produces for other thread implementations, messages appear at
- #### different times, etc. So these tests are specific to LinuxThreads.
- ####
- #### However, if all goes well, Linux will soon have a libthread_db
- #### interface, and GDB will manage it the same way it does other
- #### libthread_db-based systems. Then, we can adjust this file to
- #### work with any such system.
- ### Other things we ought to test:
- ### stepping a thread while others are running
- ### killing and restarting
- ### quitting gracefully
- # This only works with Linux configurations.
- if ![istarget *-*-linux-gnu*] then {
- return
- }
- standard_testfile
- if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != ""} {
- return -1
- }
- clean_restart ${binfile}
- gdb_test_no_output "set print sevenbit-strings"
- runto_main
- # There should be no threads initially.
- gdb_test "info threads" ".*" "info threads 1"
- # Try stepping over the thread creation function.
- gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: create philosopher"]
- set expect_manager -1
- for {set i 0} {$i < 5} {incr i} {
- gdb_continue_to_breakpoint "about to create philosopher: $i"
- set threads_before {}
- gdb_test_multiple "info threads" "info threads before: $i" {
- -re "info threads\r\n" {
- exp_continue
- }
- -re "^ *Id.*Frame *\[\r\n\]+" {
- exp_continue
- }
- -re "^. +(\[0-9\]+ *Thread \[-0-9a-fx.\]+) \[^\n\]*\n" {
- verbose -log "found thread $expect_out(1,string)" 2
- lappend threads_before $expect_out(1,string)
- exp_continue
- }
- -re "^\[^\n\]*\n" {
- verbose -log "skipping line" 2
- exp_continue -continue_timer
- }
- -re "^$gdb_prompt $" {
- }
- }
- set threads_created 0
- gdb_test_multiple "next" "create philosopher: $i" {
- -re "^next\r\n" {
- exp_continue
- }
- -re "^ *\[_!\] \[0-9\]* \[_!\]\r\n" {
- # Ignore program output.
- exp_continue -continue_timer
- }
- -re "^\\\[New \[^\]\n\]+\\\]\[^\n\]+\n" {
- incr threads_created
- exp_continue
- }
- -re "^189\[^\n\]+\n" {
- exp_continue
- }
- -re "^$gdb_prompt $" {
- }
- -re " received signal.*(Unknown signal|SIGUSR|Real-time event).*$gdb_prompt $" {
- # It would be nice if we could catch the message that GDB prints
- # when it first notices that the thread library doesn't support
- # debugging, or if we could explicitly ask GDB somehow.
- unsupported "this GDB does not support threads on this system."
- return -1
- }
- -re "$gdb_prompt $" {
- }
- }
- if { $threads_created == 1 } {
- if { $expect_manager < 0 } {
- set expect_manager 0
- }
- pass "create philosopher: $i"
- } elseif { !$i && $threads_created == 2 } {
- # Two threads are created the first time in LinuxThreads,
- # where the second is the manager thread. In NPTL, there is none.
- set expect_manager 1
- pass "create philosopher: $i"
- } else {
- fail "create philosopher: $i"
- }
-
- set threads_after {}
- gdb_test_multiple "info threads" "info threads after: $i" {
- -re "info threads\r\n" {
- exp_continue
- }
- -re "^ *Id.*Frame *\[\r\n\]+" {
- exp_continue
- }
- -re "^. +(\[0-9\]+ *Thread \[-0-9a-fx.\]+) \[^\n\]*\n" {
- set name $expect_out(1,string)
- for {set j 0} {$j != [llength $threads_before] } {incr j} {
- if {$name == [lindex $threads_before $j]} {
- set threads_before [lreplace $threads_before $j $j]
- set name ""
- break
- }
- }
- if { $name != "" } {
- lappend threads_after $name
- }
- exp_continue
- }
- -re "^\[^\n\]*\n" {
- verbose -log "skipping line" 2
- exp_continue -continue_timer
- }
- -re "^$gdb_prompt $" {
- if { [llength $threads_before] != 0 } {
- fail "info threads after: $i"
- } elseif { !$i && [llength $threads_after] == 2 } {
- set expect_manager 1
- pass "info threads after: $i"
- } elseif { [llength $threads_after] == 1 } {
- if { $expect_manager < 0 } {
- set expect_manager 0
- }
- pass "info threads after: $i"
- } else {
- fail "info threads after: $i"
- }
- }
- }
- }
- set nthreads 6
- # Run until there are some threads.
- gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: info threads 2"]
- gdb_continue_to_breakpoint "main thread's sleep"
- set info_threads_ptn ".*"
- for {set i 1} {$i < $nthreads} {incr i} {
- append info_threads_ptn "$i *Thread .*"
- }
- append info_threads_ptn "\[\r\n\]+$gdb_prompt $"
- set info_threads_manager_ptn "[expr $nthreads + 1] *Thread .*$info_threads_ptn"
- gdb_test_multiple "info threads" "info threads 2" {
- -re "$info_threads_manager_ptn" {
- # We did see a manager thread. Check that against what we expected.
- switch -exact -- $expect_manager {
- -1 {
- # We weren't sure whether to expect a manager thread.
- pass "info threads 2"
- }
- 1 {
- # We were expecting a manager thread.
- pass "info threads 2"
- }
- 0 {
- # We were not expecting to see the manager thread.
- fail "info threads 2"
- }
- }
- set expect_manager 1
- incr nthreads
- }
- -re "$info_threads_ptn" {
- # We did not see a manager thread. Check that against what we
- # expected.
- switch -exact -- $expect_manager {
- -1 {
- # We weren't sure whether to expect a manager thread.
- # Don't expect it from here on out.
- pass "info threads 2"
- }
- 1 {
- # We were expecting a manager thread, but we didn't see one.
- fail "info threads 2"
- }
- 0 {
- # We were not expecting to see the manager thread.
- pass "info threads 2"
- }
- }
- set expect_manager 0
- }
- }
- # Try setting a thread-specific breakpoint.
- gdb_breakpoint "print_philosopher thread 5"
- gdb_continue_to_breakpoint "thread 5's print"
- # When there is no debugging info available for the thread library,
- # the backtrace entry for philosopher's caller looks like:
- # #2 0x4001c548 in pthread_create () from /lib/libpthread.so.0
- # If you do have debug info, the output obviously depends more on the
- # exact library in use; under NPTL, you get:
- # #2 0x0012b7fc in start_thread (arg=0x21) at pthread_create.c:264
- gdb_test "where" "print_philosopher.*philosopher.* \(from .*libpthread\|at pthread_create\|in pthread_create|from .*libc\\.\).*" \
- "first thread-specific breakpoint hit"
- # Make sure it's catching the right thread. Try hitting the
- # breakpoint ten times, and make sure we don't get anyone else.
- set only_five 1
- for {set i 0} {$only_five > 0 && $i < 10} {incr i} {
- gdb_continue_to_breakpoint "thread 5's print, pass: $i"
- gdb_test_multiple "info threads" "" {
- -re "\[*\] 5 *Thread .* +print_philosopher .*\r\n$gdb_prompt $" {
- # Okay this time.
- }
- -re ".*$gdb_prompt $" {
- set only_five 0
- }
- timeout {
- set only_five -1
- }
- }
- }
- set name "thread-specific breakpoint is thread-specific"
- if {$only_five == 1} { pass $name }
- if {$only_five == 0} { fail $name }
- if {$only_five == -1} { fail "$name (timeout)" }
- ### Select a particular thread.
- proc select_thread {thread} {
- global gdb_prompt
- gdb_test "thread $thread" \
- "\\\[Switching to thread .*\\\].*" \
- "selected thread: $thread"
- }
- ### Select THREAD, check for a plausible backtrace, and make sure
- ### we're actually selecting a different philosopher each time.
- ### Return true if the thread had a stack which was not only
- ### acceptable, but interesting. SEEN should be an array in which
- ### SEEN(N) exists iff we have found philosopher number N before.
- set main_seen 0
- set manager_seen 0
- proc check_philosopher_stack {thread seen_name} {
- global gdb_prompt
- upvar $seen_name seen
- global main_seen
- global expect_manager manager_seen
- set name "philosopher is distinct: $thread"
- set interesting 0
- select_thread $thread
- gdb_test_multiple "where" "$name" {
- -re ".* in philosopher \\(data=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" {
- set data $expect_out(1,string)
- if {[info exists seen($data)]} {
- fail $name
- } else {
- pass $name
- set seen($data) yep
- }
- set interesting 1
- }
- -re ".* in __pthread_manager \\(.*$gdb_prompt $" {
- if {$manager_seen == 1} {
- fail "manager thread is distinct: $thread"
- } else {
- set manager_seen 1
- pass "manager thread is distinct: $thread"
- }
- set interesting 1
- }
- -re "pthread_start_thread.*\r\n$gdb_prompt $" {
- ## Maybe the thread hasn't started yet.
- pass $name
- }
- -re ".* in main \\(.*$gdb_prompt $" {
- if {$main_seen == 1} {
- fail "main is distinct: $thread"
- } else {
- set main_seen 1
- pass "main is distinct: $thread"
- }
- set interesting 1
- }
- -re " in \\?\\?.*\r\n$gdb_prompt $" {
- ## Sometimes we can't get a backtrace. I'm going to call
- ## this a pass, since we do verify that at least one
- ## thread was interesting, so we can get more consistent
- ## test suite totals. But in my heart, I think it should
- ## be an xfail.
- pass $name
- }
- }
- return $interesting
- }
- set any_interesting 0
- catch {unset seen}
- array set seen {}
- for {set i 1} {$i <= $nthreads} {incr i} {
- if [check_philosopher_stack $i seen] {
- set any_interesting 1
- }
- }
- unset seen
- if {$any_interesting} {
- pass "found an interesting thread"
- } else {
- fail "found an interesting thread"
- }
- if {$manager_seen == $expect_manager} {
- pass "manager thread found (not found) when expected"
- } else {
- fail "manager thread found (not found) when expected"
- }
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