RFA (threads testsuite): More thread tests

[Daniel Jacobowitz <drow at mvista dot com>]

Here's two tests I had lying around from when I developed the gdbserver
threads support.  Gdbserver passes them with flying colors (if you use my
other patch which lets gdbserver run tests properly).  GDB shows a couple of
problems, unpredictably (not always repeatable).

OK to add these?

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

2002-07-09  Daniel Jacobowitz  <drow@mvista.com>

	* gdb.threads/print-threads.c: New file.
	* gdb.threads/print-threads.exp: New file.
	* gdb.threads/schedlock.c: New file.
	* gdb.threads/schedlock.exp: New file.

--- /dev/null	Wed Dec 31 19:00:00 1969
+++ gdb.threads/print-threads.c	Tue Jun 11 14:56:44 2002
@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+void *thread_function(void *arg); /* Pointer to function executed by each thread */
+
+int slow = 0;
+
+#define NUM 5
+
+int main() {
+    int res;
+    pthread_t threads[NUM];
+    void *thread_result;
+    int args[NUM];
+    int i;
+
+    for (i = 0; i < NUM; i++)
+      {
+	args[i] = i;
+	res = pthread_create(&threads[i], NULL, thread_function, (void *)&args[i]);
+      }
+
+    for (i = 0; i < NUM; i++)
+      res = pthread_join(threads[i], &thread_result);
+
+    printf ("Done\n");
+
+    if (slow)
+      sleep (4);
+
+    exit(EXIT_SUCCESS);
+}
+
+void *thread_function(void *arg) {
+    int my_number = *(int *)arg;
+    int rand_num;
+
+    printf ("Print 1, thread %d\n", my_number);
+    sleep (1);
+
+    if (slow)
+      {
+	printf ("Print 2, thread %d\n", my_number);
+	sleep (1);
+	printf ("Print 3, thread %d\n", my_number);
+	sleep (1);
+	printf ("Print 4, thread %d\n", my_number);
+	sleep (1);
+	printf ("Print 5, thread %d\n", my_number);
+	sleep (1);
+      }
+
+    printf("Bye from %d\n", my_number);
+    pthread_exit(NULL);
+}
+
--- /dev/null	Wed Dec 31 19:00:00 1969
+++ gdb.threads/print-threads.exp	Tue Jun 11 14:56:44 2002
@@ -0,0 +1,158 @@
+# Copyright (C) 1996, 1997, 2002 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 2 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, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  
+
+# Please email any bugs, comments, and/or additions to this file to:
+# bug-gdb@prep.ai.mit.edu
+
+# This file was written by Daniel Jacobowitz <drow@mvista.com>
+# (parts based on pthreads.exp by Fred Fish (fnf@cygnus.com).
+
+if $tracelevel then {
+	strace $tracelevel
+}
+
+set prms_id 0
+set bug_id 0
+
+# This only works with native configurations
+if ![isnative] then {
+    return
+}
+
+set testfile "print-threads"
+set srcfile ${testfile}.c
+set binfile ${objdir}/${subdir}/${testfile}
+
+# regexp for "horizontal" text (i.e. doesn't include newline or
+# carriage return)
+set horiz "\[^\n\r\]*"
+
+set built_binfile 0
+
+# Default to the usual (only?) -lpthread on GNU/Linux to quiet noise
+if [istarget "*-*-linux*"] then {
+    set possible_libs "-lpthread -lpthreads -lthread"
+} else {
+    set possible_libs "-lpthreads -lpthread -lthread"
+}
+
+set why_msg "unrecognized error"
+foreach lib $possible_libs {
+    set options "debug"
+    lappend options "incdir=${objdir}/${subdir}"
+    lappend options "libs=$lib"
+    set ccout [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable $options]
+    switch -regexp -- $ccout {
+	".*no posix threads support.*" {
+	    set why_msg "missing threads include file"
+	    break
+	}
+	".*cannot open -lpthread.*" {
+	    set why_msg "missing runtime threads library"
+	}
+	".*Can't find library for -lpthread.*" {
+	    set why_msg "missing runtime threads library"
+	}
+	{^$} {
+	    pass "successfully compiled posix threads test case"
+	    set built_binfile 1
+	    break
+	}
+    }
+}
+if {$built_binfile == "0"} {
+    unsupported "Couldn't compile ${srcfile}, ${why_msg}"
+    return -1
+}
+
+# Now we can proceed with the real testing.
+
+# Start with a fresh gdb.
+
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+gdb_load ${binfile}
+
+gdb_test "set print sevenbit-strings" ""
+#gdb_test "set print address off" ""
+gdb_test "set width 0" ""
+
+# We'll need this when we send_gdb a ^C to GDB.  Need to do it before we
+# run the program and gdb starts saving and restoring tty states.
+# On Ultrix, we don't need it and it is really slow (because shell_escape
+# doesn't use vfork).
+if ![istarget "*-*-ultrix*"] then {
+    gdb_test "shell stty intr '^C'" ""
+}
+
+proc test_all_threads { name kill } {
+    global gdb_prompt
+
+    set i 0
+    set j 0
+    send_gdb "continue\n"
+    gdb_expect {
+	-re "Breakpoint \[0-9\]+, thread_function \\(arg=.*\\) at .*print-threads.c:\[0-9\]+.*$gdb_prompt" {
+	    set i [expr $i + 1]
+	    pass "Hit thread_function breakpoint, $i ($name)"
+	    send_gdb "continue\n"
+	    exp_continue
+	}
+	-re "Breakpoint \[0-9\]+, .* kill \\(.*\\) .*$gdb_prompt" {
+	    set j [expr $j + 1]
+	    if { $kill == 1 } {
+		pass "Hit kill breakpoint, $j ($name)"
+	    } else {
+		fail "Hit kill breakpoint, $j ($name) (unexpected)"
+	    }
+	    send_gdb "continue\n"
+	    exp_continue
+	}
+	-re "Program exited normally\\.\[\r\n\]+$gdb_prompt" {
+	    pass "program exited normally"
+	    if {$i == 5} {
+		pass "all threads ran once ($name)"
+	    } else {
+		fail "all threads ran once ($name) (total $i threads ran)"
+	    }
+	}
+	-re "$gdb_prompt" {
+	    fail "Running threads ($name) (unknown output)"
+	}
+	timeout {
+	    fail "Running threads ($name) (timeout)"
+	}
+    }
+}
+
+runto_main
+gdb_test "break thread_function" "Breakpoint \[0-9\]+ at 0x\[0-9a-f\]+: file .*print-threads.c, line \[0-9\]*\\."
+gdb_test "set var slow = 0" ""
+test_all_threads "fast" 0
+
+runto_main
+gdb_test "break thread_function" "Breakpoint \[0-9\]+ at 0x\[0-9a-f\]+: file .*print-threads.c, line \[0-9\]*\\." "break thread_function (2)"
+gdb_test "set var slow = 1" ""
+test_all_threads "slow" 0
+
+runto_main
+gdb_test "break thread_function" "Breakpoint \[0-9\]+ at 0x\[0-9a-f\]+: file .*print-threads.c, line \[0-9\]*\\." "break thread_function (3)"
+gdb_test "set var slow = 1" "" "set var slow = 1 (2)"
+gdb_test "break kill" "Breakpoint \[0-9\]+ at 0x\[0-9a-f\]+"
+test_all_threads "slow with kill breakpoint" 1
+
+return 0
--- /dev/null	Wed Dec 31 19:00:00 1969
+++ gdb.threads/schedlock.c	Tue Jun 11 14:56:44 2002
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+void *thread_function(void *arg); /* Pointer to function executed by each thread */
+
+#define NUM 5
+
+int args[NUM+1];
+
+int main() {
+    int res;
+    pthread_t threads[NUM];
+    void *thread_result;
+    int i;
+
+    for (i = 0; i < NUM; i++)
+      {
+	args[i] = 1;
+	res = pthread_create(&threads[i], NULL, thread_function, (void *)i);
+      }
+
+    /* schedlock.exp: last thread start.  */
+    args[i] = 1;
+    thread_function ((void *) i);
+
+    exit(EXIT_SUCCESS);
+}
+
+void *thread_function(void *arg) {
+    int my_number = (int) arg;
+    int *myp = &args[my_number];
+
+    /* Don't run forever.  Run just short of it :)  */
+    while (*myp > 0)
+      {
+	/* schedlock.exp: main loop.  */
+	(*myp) ++;
+      }
+
+    pthread_exit(NULL);
+}
+
--- /dev/null	Wed Dec 31 19:00:00 1969
+++ gdb.threads/schedlock.exp	Tue Jun 11 14:56:44 2002
@@ -0,0 +1,374 @@
+# Copyright (C) 1996, 1997, 2002 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 2 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, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  
+
+# Please email any bugs, comments, and/or additions to this file to:
+# bug-gdb@prep.ai.mit.edu
+
+# This file was written by Daniel Jacobowitz <drow@mvista.com>
+# (parts based on pthreads.exp by Fred Fish (fnf@cygnus.com).
+
+if $tracelevel then {
+	strace $tracelevel
+}
+
+set prms_id 0
+set bug_id 0
+
+# This only works with native configurations
+if ![isnative] then {
+    return
+}
+
+set testfile "schedlock"
+set srcfile ${testfile}.c
+set binfile ${objdir}/${subdir}/${testfile}
+
+set built_binfile 0
+
+# Default to the usual (only?) -lpthread on GNU/Linux to quiet noise
+if [istarget "*-*-linux*"] then {
+    set possible_libs "-lpthread -lpthreads -lthread"
+} else {
+    set possible_libs "-lpthreads -lpthread -lthread"
+}
+
+set why_msg "unrecognized error"
+foreach lib $possible_libs {
+    set options "debug"
+    lappend options "incdir=${objdir}/${subdir}"
+    lappend options "libs=$lib"
+    set ccout [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable $options]
+    switch -regexp -- $ccout {
+	".*no posix threads support.*" {
+	    set why_msg "missing threads include file"
+	    break
+	}
+	".*cannot open -lpthread.*" {
+	    set why_msg "missing runtime threads library"
+	}
+	".*Can't find library for -lpthread.*" {
+	    set why_msg "missing runtime threads library"
+	}
+	{^$} {
+	    pass "successfully compiled posix threads test case"
+	    set built_binfile 1
+	    break
+	}
+    }
+}
+if {$built_binfile == "0"} {
+    unsupported "Couldn't compile ${srcfile}, ${why_msg}"
+    return -1
+}
+
+# Now we can proceed with the real testing.
+
+proc get_args { } {
+  global list_count
+  global gdb_prompt
+
+  send_gdb "print args\n"
+  gdb_expect {
+    -re "\\\$\[0-9\]+ = {(\[0-9\]+), (\[0-9\]+), (\[0-9\]+), (\[0-9\]+), (\[0-9\]+), (\[0-9\]+)}.*$gdb_prompt"
+      {
+	set list_count [expr $list_count + 1]
+	pass "listed args ($list_count)"
+	return [list $expect_out(1,string) $expect_out(2,string) $expect_out(3,string) $expect_out(4,string) $expect_out(5,string) $expect_out(6,string)]
+      }
+    -re "$gdb_prompt"
+      {
+	fail "listed args ($list_count) (unknown output)"
+      }
+    timeout
+      {
+	fail "listed args ($list_count) (timeout)"
+      }
+  }
+}
+
+proc stop_process { description } {
+  global gdb_prompt
+
+  # For this to work we must be sure to consume the "Continuing."
+  # message first, or GDB's signal handler may not be in place.
+  after 1000 {send_gdb "\003"}
+  gdb_expect {
+    -re "Program received signal SIGINT.*$gdb_prompt $"
+      {
+	pass $description
+      }
+    timeout
+      {
+	fail "$description (timeout)"
+      }
+  }
+}
+
+proc get_current_thread { description } {
+  global gdb_prompt
+
+  send_gdb "bt\n"
+  gdb_expect {
+    -re "thread_function \\(arg=0x(\[0-9\])\\).*$gdb_prompt $"
+      {
+	pass $description
+	return $expect_out(1,string)
+      }
+    -re "$gdb_prompt $"
+      {
+	fail "$description (unknown output)"
+      }
+    timeout
+      {
+	fail "$description (timeout)"
+      }
+  }
+
+  return
+  send_gdb "info threads\n"
+  gdb_expect {
+    -re "\\* (\[0-9\]+) .*$gdb_prompt $"
+      {
+	pass $description
+	return $expect_out(1,string)
+      }
+    -re "$gdb_prompt $"
+      {
+	fail "$description (unknown output)"
+      }
+    timeout
+      {
+	fail "$description (timeout)"
+      }
+  }
+}
+
+proc my_continue { msg } {
+  send_gdb "continue\n"
+  gdb_expect {
+    -re "Continuing"
+      { pass "continue ($msg)" }
+    timeout
+      { fail "continue ($msg) (timeout)" }
+  }
+
+  stop_process "stop all threads ($msg)"
+
+  # Make sure we're in one of the looping threads.
+  gdb_breakpoint [gdb_get_line_number "schedlock.exp: main loop"]
+  gdb_continue_to_breakpoint "return to loop ($msg)"
+  delete_breakpoints
+}
+
+proc step_ten_loops { msg } {
+    global gdb_prompt
+
+    for {set i 0} {[expr $i < 10]} {set i [expr $i + 1]} {
+	send_gdb "step\n"
+	set other_step 0
+	gdb_expect {
+	    -re ".*myp\\) \\+\\+;\[\r\n\]+$gdb_prompt $" {
+		pass "step to increment ($msg $i)"
+	    }
+	    -re "$gdb_prompt $" {
+		if {$other_step == 0} {
+		    set other_step 1
+		    send_gdb "step\n"
+		    exp_continue
+		} else {
+		    fail "step to increment ($msg $i)"
+		    # FIXME cascade?
+		}
+	    }
+	    timeout {
+		fail "step to increment ($msg $i) (timeout)"
+	    }
+	}
+    }
+}
+
+# Start with a fresh gdb.
+
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+
+# We'll need this when we send_gdb a ^C to GDB.  Need to do it before we
+# run the program and gdb starts saving and restoring tty states.
+# On Ultrix, we don't need it and it is really slow (because shell_escape
+# doesn't use vfork).
+if ![istarget "*-*-ultrix*"] then {
+    gdb_test "shell stty intr '^C'" ""
+}
+
+gdb_load ${binfile}
+
+gdb_test "set print sevenbit-strings" ""
+gdb_test "set width 0" ""
+
+runto_main
+
+# See if scheduler locking is available on this target.
+send_gdb "set scheduler-locking off\n"
+global gdb_prompt
+gdb_expect {
+  -re "Target .* cannot support this command"
+    {
+      unsupported "target does not support scheduler locking"
+      return
+    }
+  -re "$gdb_prompt $"
+    {
+      pass "scheduler locking set to none"
+    }
+  timeout
+    {
+      unsupported "target does not support scheduler locking (timeout)"
+      return
+    }
+}
+
+gdb_breakpoint [gdb_get_line_number "schedlock.exp: last thread start"]
+gdb_continue_to_breakpoint "all threads started"
+
+global list_count
+set list_count 0
+
+set start_args [get_args]
+
+# First make sure that all threads are alive.
+my_continue "initial"
+
+set cont_args [get_args]
+
+for {set i 0} {[expr $i < 6]} {set i [expr $i + 1]} {
+  if {[lindex $start_args $i] == [lindex $cont_args $i]} {
+    fail "thread $i ran (didn't run)"
+  } else {
+    pass "thread $i ran"
+  }
+}
+
+# We can't change threads, unfortunately, in current GDB.  Use
+# whichever we stopped in.
+set curthread [get_current_thread "find current thread (1)"]
+
+
+
+
+# Test stepping without scheduler locking.
+gdb_test "set scheduler-locking off"  ""
+
+step_ten_loops "unlocked"
+
+# Make sure we're still in the same thread.
+set newthread [get_current_thread "find current thread (2)"]
+if {$curthread == $newthread} {
+    pass "step without lock does not change thread"
+} else {
+    fail "step without lock does not change thread (switched to thread $newthread)"
+}
+
+set start_args $cont_args
+set cont_args [get_args]
+
+for {set i 0} {[expr $i < 6]} {set i [expr $i + 1]} {
+  if {[lindex $start_args $i] == [lindex $cont_args $i]} {
+    if {$i == $curthread} {
+      fail "current thread stepped (didn't run)"
+    } else {
+      fail "other thread $i ran (didn't run) (1)"
+    }
+  } else {
+    if {$i == $curthread} {
+	if {[lindex $start_args $i] == [expr [lindex $cont_args $i] - 10]} {
+	    pass "current thread stepped"
+	} else {
+	    fail "current thread stepped (wrong amount)"
+	}
+    } else {
+      pass "other thread $i ran (1)"
+    }
+  }
+}
+
+# Test continue with scheduler locking
+gdb_test "set scheduler-locking on"  ""
+
+my_continue "with lock"
+
+# Make sure we're still in the same thread.
+set newthread [get_current_thread "find current thread (3)"]
+if {$curthread == $newthread} {
+    pass "continue with lock does not change thread"
+} else {
+    fail "continue with lock does not change thread (switched to thread $newthread)"
+}
+
+set start_args $cont_args
+set cont_args [get_args]
+
+for {set i 0} {[expr $i < 6]} {set i [expr $i + 1]} {
+  if {[lindex $start_args $i] == [lindex $cont_args $i]} {
+    if {$i == $curthread} {
+      fail "current thread ran (didn't run)"
+    } else {
+      pass "other thread $i didn't run"
+    }
+  } else {
+    if {$i == $curthread} {
+      pass "current thread ran"
+    } else {
+      fail "other thread $i didn't run (ran)"
+    }
+  }
+}
+
+# Test stepping with scheduler locking
+step_ten_loops "locked"
+
+# Make sure we're still in the same thread.
+set newthread [get_current_thread "find current thread (2)"]
+if {$curthread == $newthread} {
+    pass "step with lock does not change thread"
+} else {
+    fail "step with lock does not change thread (switched to thread $newthread)"
+}
+
+set start_args $cont_args
+set cont_args [get_args]
+
+for {set i 0} {[expr $i < 6]} {set i [expr $i + 1]} {
+  if {[lindex $start_args $i] == [lindex $cont_args $i]} {
+    if {$i == $curthread} {
+      fail "current thread stepped locked (didn't run)"
+    } else {
+      pass "other thread $i didn't run (stepping)"
+    }
+  } else {
+    if {$i == $curthread} {
+	if {[lindex $start_args $i] == [expr [lindex $cont_args $i] - 10]} {
+	    pass "current thread stepped locked"
+	} else {
+	    fail "current thread stepped locked (wrong amount)"
+	}
+    } else {
+      fail "other thread $i didn't run (stepping) (ran)"
+    }
+  }
+}
+
+return 0