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# tls.exp -- Expect script to test thread-local storage
# Copyright (C) 1992, 2003, 2007, 2008, 2009, 2010
# 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
# 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 <>. */
set testfile tls
set testfile2 tls2
set srcfile ${testfile}.c
set srcfile2 ${testfile2}.c
set binfile ${objdir}/${subdir}/${testfile}
if [istarget "*-*-linux"] then {
set target_cflags "-D_MIT_POSIX_THREADS"
} else {
set target_cflags ""
if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile} ${srcdir}/${subdir}/${srcfile2}" "${binfile}" executable [list debug "incdir=${objdir}"]] != "" } {
return -1
### Compute the value of the a_thread_local variable.
proc compute_expected_value {value} {
set expected_value 0
set i 0
while { $i <= $value} {
incr expected_value $i
incr i
return $expected_value
### Get the value of the variable 'me' for the current thread.
proc get_me_variable {tnum} {
global expect_out
global gdb_prompt
global decimal
set value_of_me -1
send_gdb "print me\n"
gdb_expect {
-re ".*= ($decimal).*\r\n$gdb_prompt $" {
set value_of_me $expect_out(1,string)
pass "$tnum thread print me"
-re "$gdb_prompt $" {
fail "$tnum thread print me"
timeout {
fail "$tnum thread print me (timeout)"
return ${value_of_me}
### Check the values of the thread local variables in the thread.
### Also check that info address print the right things.
proc check_thread_local {number} {
set me_variable [get_me_variable $number]
set expected_value [compute_expected_value ${me_variable}]
gdb_test "p a_thread_local" \
"= $expected_value" \
"${number} thread local storage"
gdb_test "p another_thread_local" \
"= $me_variable" \
"${number} another thread local storage"
gdb_test "info address a_thread_local" \
".*a_thread_local.*a thread-local variable at offset.*" \
"${number} info address a_thread_local"
gdb_test "info address another_thread_local" \
".*another_thread_local.*a thread-local variable at offset.*" \
"${number} info address another_thread_local"
### Select a particular thread.
proc select_thread {thread} {
global gdb_prompt
send_gdb "thread $thread\n"
gdb_expect {
-re "\\\[Switching to thread .*\\\].*\r\n$gdb_prompt $" {
pass "selected thread: $thread"
-re "$gdb_prompt $" {
fail "selected thread: $thread"
timeout {
fail "selected thread: $thread (timeout)"
### Do a backtrace for the current thread, and check that the 'spin' routine
### is in it. This means we have one of the threads we created, rather
### than the main thread. Record the thread in the spin_threads
### array. Also remember the level of the 'spin' routine in the backtrace, for
### later use.
proc check_thread_stack {number spin_threads spin_threads_level} {
global gdb_prompt
global expect_out
global decimal
global hex
upvar $spin_threads tarr
upvar $spin_threads_level tarrl
select_thread $number
send_gdb "where\n"
gdb_expect {
-re ".*(\[0-9\]+)\[ \t\]+$hex in spin \\(vp=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" {
if {[info exists tarr($number)]} {
fail "backtrace of thread number $number in spin"
} else {
pass "backtrace of thread number $number in spin"
set level $expect_out(1,string)
set tarrl($number) $level
set tarr($number) 1
-re ".*$gdb_prompt $" {
set tarr($number) 0
set tarrl($number) 0
pass "backtrace of thread number $number not relevant"
timeout {
fail "backtrace of thread number $number (timeout)"
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}
if ![runto_main] then {
fail "Can't run to main"
return 0
# Set a breakpoint at the "spin" routine to
# test the thread local's value.
gdb_test "b [gdb_get_line_number "here we know tls value"]" \
".*Breakpoint 2.*tls.*" "set breakpoint at all threads"
# Set a bp at a point where we know all threads are alive.
gdb_test "b [gdb_get_line_number "still alive"]" \
".*Breakpoint 3.*tls.*" "set breakpoint at synch point"
# Set a bp at the end to see if all threads are finished.
gdb_test "b [gdb_get_line_number "before exit"]" \
".*Breakpoint 4.*tls.*" "set breakpoint at exit"
send_gdb "continue\n"
gdb_expect {
-re ".*Program received signal SIGSEGV.*a_thread_local = 0;.*$gdb_prompt $" {
# This is the first symptom if the gcc and binutils versions
# in use support TLS, but the system glibc does not.
unsupported "continue to first thread: system does not support TLS"
return -1
-re ".*Program exited normally.*$gdb_prompt $" {
fail "continue to first thread: program runaway"
-re ".*Pass 0 done.*Pass 1 done.*$gdb_prompt $" {
fail "continue to first thread: program runaway 2"
-re ".*Breakpoint 2.*tls value.*$gdb_prompt $" {
pass "continue to first thread: get to thread"
-re ".*$gdb_prompt $" {
fail "continue to first thread: no progress?"
timeout { fail "continue to first thread (timeout)" }
gdb_test "info thread" ".*Thread.*spin.*" \
"at least one th in spin while stopped at first th"
check_thread_local "first"
gdb_test "continue" ".*Breakpoint 2.*tls value.*" "continue to second thread"
gdb_test "info thread" "Thread.*spin.*" \
"at least one th in spin while stopped at second th"
check_thread_local "second"
gdb_test "continue" ".*Breakpoint 2.*tls value.*" "continue to third thread"
gdb_test "info thread" ".*Thread.*spin.*" \
"at least one th in spin while stopped at third th"
check_thread_local "third"
gdb_test "continue" ".*Breakpoint 3.*still alive.*" "continue to synch point"
set no_of_threads 0
send_gdb "info thread\n"
gdb_expect {
-re "^info thread\[ \t\r\n\]+(\[0-9\]+) Thread.*$gdb_prompt $" {
set no_of_threads $expect_out(1,string)
pass "get number of threads"
-re "$gdb_prompt $" {
fail "get number of threads"
timeout {
fail "get number of threads (timeout)"
array set spin_threads {}
unset spin_threads
array set spin_threads_level {}
unset spin_threads_level
# For each thread check its backtrace to see if it is stopped at the
# spin routine.
for {set i 1} {$i <= $no_of_threads} {incr i} {
check_thread_stack $i spin_threads spin_threads_level
### Loop through the threads and check the values of the tls variables.
### keep track of how many threads we find in the spin routine.
set thrs_in_spin 0
foreach i [array names spin_threads] {
if {$spin_threads($i) == 1} {
incr thrs_in_spin
select_thread $i
set level $spin_threads_level($i)
# We expect to be in sem_wait, but if the thread has not yet
# been scheduled, we might be in sem_post still. We could be at
# any intermediate point in spin, too, but that is much less
# likely.
gdb_test "up $level" ".*spin.*sem_(wait|post).*" "thread $i up"
check_thread_local $i
if {$thrs_in_spin == 0} {
fail "No thread backtrace reported spin (vsyscall kernel problem?)"
gdb_test "continue" ".*Breakpoint 4.*before exit.*" "threads exited"
send_gdb "info thread\n"
gdb_expect {
-re ".* 1 Thread.*2 Thread.*$gdb_prompt $" {
fail "Too many threads left at end"
-re ".*\\\* 1 Thread.*main.*$gdb_prompt $" {
pass "Expect only base thread at end"
-re ".*No stack.*$gdb_prompt $" {
fail "runaway at end"
-re ".*$gdb_prompt $" {
fail "mess at end"
timeout { fail "at end (timeout)" }
# Start over and do some "info address" stuff
runto spin
gdb_test "info address a_global" \
".*a_global.*static storage at address.*" "info address a_global"
setup_kfail "gdb/1294" "*-*-*"
gdb_test "info address me" ".*me.*is a variable at offset.*" "info address me"
# Test LOC_UNRESOLVED references resolving for `extern' TLS variables.
gdb_test "p a_thread_local" " = \[0-9\]+"
# Here it could crash with: Cannot access memory at address 0x0
gdb_test "p file2_thread_local" " = \[0-9\]+"
# Depending on the current lookup scope we get LOC_UNRESOLVED or LOC_COMPUTED
# both printing:
# Symbol "file2_thread_local" is a thread-local variable at offset 8 in the thread-local storage for `.../gdb.threads/tls'.
gdb_test "info address file2_thread_local" "Symbol \"file2_thread_local\" is a thread-local variable.*"
# Here it could also crash with: Cannot access memory at address 0x0
gdb_test "p a_thread_local" " = \[0-9\]+" "p a_thread_local second time"
gdb_test "info address a_thread_local" "Symbol \"a_thread_local\" is a thread-local variable.*"
# Done!
return 0
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