gdb/testsuite/gdb.threads/schedlock.exp

   1 # Copyright (C) 1996-2019 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 # This file was written by Daniel Jacobowitz <drow@mvista.com>
  17 # (parts based on pthreads.exp by Fred Fish (fnf@cygnus.com).
  18 #
  19 # This test covers the various forms of "set scheduler-locking".
  20
  21 # This test requires sending ^C to interrupt the running target.
  22
  23 if [target_info exists gdb,nointerrupts] {
  24     verbose "Skipping schedlock.exp because of nointerrupts."
  25     return
  26 }
  27
  28 standard_testfile
  29
  30 # The number of threads, including the main thread.
  31 set NUM 2
  32
  33 if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable debug] != "" } {
  34     return -1
  35 }
  36
  37 # Now we can proceed with the real testing.
  38
  39 # Get the current contents of the `args` array in the test program.
  40 # Description is appended to the test message.
  41
  42 proc get_args { description } {
  43     global gdb_prompt
  44     global NUM
  45
  46     set pattern "(\[0-9\]+)"
  47     for {set i 1} {[expr $i < $NUM]} {incr i} {
  48         append pattern ", (\[0-9\]+)"
  49     }
  50
  51     set test "listed args ($description)"
  52     gdb_test_multiple "print args" $test {
  53         -re "\\\$\[0-9\]+ = {$pattern}.*$gdb_prompt $" {
  54             pass $test
  55
  56             set result ""
  57             for {set i 1} {[expr $i <= $NUM]} {incr i} {
  58                 lappend result $expect_out($i,string)
  59             }
  60             return $result
  61         }
  62     }
  63 }
  64
  65 proc stop_process { description } {
  66   global gdb_prompt
  67
  68   # For this to work we must be sure to consume the "Continuing."
  69   # message first, or GDB's signal handler may not be in place.
  70   after 1000 {send_gdb "\003"}
  71   gdb_expect {
  72     -re "Thread .* received signal SIGINT.*$gdb_prompt $"
  73       {
  74         pass $description
  75       }
  76     timeout
  77       {
  78         fail "$description (timeout)"
  79       }
  80   }
  81 }
  82
  83 proc get_current_thread { description } {
  84     global gdb_prompt
  85
  86     set test "find current thread ($description)"
  87
  88     gdb_test_multiple "bt" $test {
  89         -re "thread_function \\(arg=0x(\[0-9\])\\).*$gdb_prompt $" {
  90             pass $test
  91             return $expect_out(1,string)
  92         }
  93     }
  94     return ""
  95 }
  96
  97 # Make sure we're stopped in the loop, in one of the non-main threads.
  98
  99 proc goto_loop { msg } {
 100     gdb_breakpoint [concat [gdb_get_line_number "schedlock.exp: main loop"] " if arg != 0"]
 101
 102     set test "return to loop"
 103     if {$msg != ""} {
 104         set test "$test ($msg)"
 105     }
 106     gdb_continue_to_breakpoint $test
 107     delete_breakpoints
 108 }
 109
 110 proc my_continue { msg } {
 111     set test "continue ($msg)"
 112     gdb_test_multiple "continue" $test {
 113         -re "Continuing" {
 114             pass $test
 115         }
 116     }
 117
 118     stop_process "stop all threads ($msg)"
 119
 120     goto_loop $msg
 121 }
 122
 123 # Use CMD to step the loop 10 times.  CMD may be "step" or "next".
 124
 125 proc step_ten_loops { cmd } {
 126     global gdb_prompt
 127
 128     for {set i 0} {[expr $i < 10]} {set i [expr $i + 1]} {
 129         set other_step 0
 130         set test "$cmd to increment ($i)"
 131         gdb_test_multiple $cmd $test {
 132             -re ".*myp\\) \\+\\+;\[\r\n\]+$gdb_prompt $" {
 133                 pass $test
 134             }
 135             -re "$gdb_prompt $" {
 136                 if {$other_step == 0} {
 137                     set other_step 1
 138                     send_gdb "$cmd\n"
 139                     exp_continue
 140                 } else {
 141                     fail $test
 142                     # FIXME cascade?
 143                 }
 144             }
 145         }
 146     }
 147 }
 148
 149 # Start with a fresh gdb.
 150
 151 gdb_exit
 152 gdb_start
 153 gdb_reinitialize_dir $srcdir/$subdir
 154
 155 # We'll need this when we send_gdb a ^C to GDB.  Need to do it before we
 156 # run the program and gdb starts saving and restoring tty states.
 157 gdb_test "shell stty intr '^C'" ".*"
 158
 159 gdb_load ${binfile}
 160
 161 gdb_test_no_output "set print sevenbit-strings"
 162 gdb_test_no_output "set width 0"
 163
 164 runto_main
 165
 166 # See if scheduler locking is available on this target.
 167 global gdb_prompt
 168 gdb_test_multiple "set scheduler-locking off" "scheduler locking set to none" {
 169     -re "Target .* cannot support this command" {
 170         unsupported "target does not support scheduler locking"
 171         return
 172     }
 173     -re "$gdb_prompt $" {
 174         pass "scheduler locking set to none"
 175     }
 176     timeout {
 177         unsupported "target does not support scheduler locking (timeout)"
 178         return
 179     }
 180 }
 181
 182 gdb_breakpoint [gdb_get_line_number "schedlock.exp: last thread start"]
 183 gdb_continue_to_breakpoint "all threads started"
 184
 185 set start_args [get_args "before initial"]
 186
 187 # First make sure that all threads are alive.
 188 my_continue "initial"
 189
 190 set cont_args [get_args "after initial"]
 191
 192 set bad 0
 193 for {set i 0} {[expr $i < $NUM]} {set i [expr $i + 1]} {
 194   if {[lindex $start_args $i] == [lindex $cont_args $i]} {
 195     incr bad
 196   }
 197 }
 198 if { $bad == 0 } {
 199   pass "all threads alive"
 200 } else {
 201   fail "all threads alive ($bad/$NUM did not run)"
 202 }
 203
 204 # Compare the previous thread and args with the current thread and
 205 # args.  Check that we didn't switch threads, and that the threads
 206 # incremented their args counter the amounts expected.  CMD is the
 207 # command being tested.  BEFORE_THREAD is the thread that was selected
 208 # before the command was run.  BEFORE_ARGS is the value of the
 209 # thread's args before the command was run.  LOCKED indicates whether
 210 # we expect threads other than the selected thread remained locked.
 211
 212 proc check_result { cmd before_thread before_args locked } {
 213     global NUM
 214
 215     # Make sure we're still in the same thread.
 216     set newthread [get_current_thread "after"]
 217
 218     set test "$cmd does not change thread"
 219     if {$before_thread == $newthread} {
 220         pass "$test"
 221     } else {
 222         fail "$test (switched to thread $newthread)"
 223     }
 224
 225     set after_args [get_args "after"]
 226
 227     set test "current thread advanced"
 228     if { $locked } {
 229         set test "$test - locked"
 230     } else {
 231         set test "$test - unlocked"
 232     }
 233
 234     set num_other_threads 0
 235     for {set i 0} {$i < $NUM} {incr i} {
 236         if {[lindex $before_args $i] == [lindex $after_args $i]} {
 237             if {$i == $before_thread} {
 238                 fail "$test (didn't run)"
 239             }
 240         } else {
 241             if {$i == $before_thread} {
 242                 if {$cmd == "continue"
 243                     || [lindex $before_args $i] == [expr [lindex $after_args $i] - 10]} {
 244                     pass "$test"
 245                 } else {
 246                     fail "$test (wrong amount)"
 247                 }
 248             } else {
 249                 incr num_other_threads
 250             }
 251         }
 252     }
 253
 254     if { $locked } {
 255         gdb_assert {$num_other_threads == 0} "other threads didn't run - locked"
 256     } else {
 257         gdb_assert {$num_other_threads > 0} "other threads ran - unlocked"
 258     }
 259 }
 260
 261 with_test_prefix "schedlock=on: cmd=continue" {
 262     # Use whichever we stopped in.
 263     set curthread [get_current_thread "before"]
 264
 265     # Test continue with scheduler locking.
 266     gdb_test "set scheduler-locking on" ""
 267
 268     my_continue "with lock"
 269
 270     check_result "continue" $curthread $cont_args 1
 271 }
 272
 273 # Test stepping/nexting with different modes of scheduler locking.
 274 proc test_step { schedlock cmd call_function } {
 275     global NUM
 276
 277     gdb_test_no_output "set scheduler-locking off"
 278     goto_loop ""
 279
 280     set curthread [get_current_thread "before"]
 281
 282     # No need to set to off again.  This avoids a duplicate message.
 283     if {$schedlock != "off"} {
 284         gdb_test_no_output "set scheduler-locking $schedlock"
 285     }
 286
 287     gdb_test "print call_function = $call_function" \
 288         " = $call_function"
 289
 290     set before_args [get_args "before"]
 291
 292     step_ten_loops $cmd
 293
 294     if { $schedlock == "on" || $schedlock == "step" } {
 295         set locked 1
 296     } else {
 297         set locked 0
 298     }
 299
 300     check_result $cmd $curthread $before_args $locked
 301 }
 302
 303 # Test stepping/nexting with different modes of scheduler locking.
 304 foreach schedlock {"off" "step" "on"} {
 305     with_test_prefix "schedlock=$schedlock" {
 306         with_test_prefix "cmd=step" {
 307             test_step $schedlock "step" 0
 308         }
 309         with_test_prefix "cmd=next" {
 310             # In GDB <= 7.9, with schedlock "step", "next" would
 311             # unlock threads when stepping over a function call.  This
 312             # exercises "next" with and without a function call.  WRT
 313             # "schedlock step", "next" should behave just like "step".
 314             foreach call_function {0 1} {
 315                 with_test_prefix "call_function=$call_function" {
 316                     test_step $schedlock "next" $call_function
 317                 }
 318             }
 319         }
 320     }
 321 }