Current File : //usr/share/mysql-test/lib/v1/mtr_timer.pl
# -*- cperl -*-
# Copyright (c) 2005, 2006 MySQL AB, 2008 Sun Microsystems, Inc.
# Use is subject to license terms.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2.0,
# as published by the Free Software Foundation.
#
# This program is also distributed with certain software (including
# but not limited to OpenSSL) that is licensed under separate terms,
# as designated in a particular file or component or in included license
# documentation. The authors of MySQL hereby grant you an additional
# permission to link the program and your derivative works with the
# separately licensed software that they have included with MySQL.
#
# 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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# This is a library file used by the Perl version of mysql-test-run,
# and is part of the translation of the Bourne shell script with the
# same name.
use Errno;
use strict;
sub mtr_init_timers ();
sub mtr_timer_start($$$);
sub mtr_timer_stop($$);
sub mtr_timer_stop_all($);
##############################################################################
#
# Initiate the structure shared by all timers
#
##############################################################################
sub mtr_init_timers () {
my $timers = { timers => {}, pids => {}};
return $timers;
}
##############################################################################
#
# Start, stop and poll a timer
#
# As alarm() isn't portable to Windows, we use separate processes to
# implement timers.
#
##############################################################################
sub mtr_timer_start($$$) {
my ($timers,$name,$duration)= @_;
if ( exists $timers->{'timers'}->{$name} )
{
# We have an old running timer, kill it
mtr_warning("There is an old timer running");
mtr_timer_stop($timers,$name);
}
FORK:
{
my $tpid= fork();
if ( ! defined $tpid )
{
if ( $! == $!{EAGAIN} ) # See "perldoc Errno"
{
mtr_warning("Got EAGAIN from fork(), sleep 1 second and redo");
sleep(1);
redo FORK;
}
else
{
mtr_error("can't fork timer, error: $!");
}
}
if ( $tpid )
{
# Parent, record the information
mtr_verbose("Starting timer for '$name',",
"duration: $duration, pid: $tpid");
$timers->{'timers'}->{$name}->{'pid'}= $tpid;
$timers->{'timers'}->{$name}->{'duration'}= $duration;
$timers->{'pids'}->{$tpid}= $name;
}
else
{
# Child, install signal handlers and sleep for "duration"
# Don't do the ^C cleanup in the timeout child processes!
# There is actually a race here, if we get ^C after fork(), but before
# clearing the signal handler.
$SIG{INT}= 'DEFAULT';
$SIG{TERM}= sub {
mtr_verbose("timer $$ woke up, exiting!");
exit(0);
};
$0= "mtr_timer(timers,$name,$duration)";
sleep($duration);
mtr_verbose("timer $$ expired after $duration seconds");
exit(0);
}
}
}
sub mtr_timer_stop ($$) {
my ($timers,$name)= @_;
if ( exists $timers->{'timers'}->{$name} )
{
my $tpid= $timers->{'timers'}->{$name}->{'pid'};
mtr_verbose("Stopping timer for '$name' with pid $tpid");
# FIXME as Cygwin reuses pids fast, maybe check that is
# the expected process somehow?!
kill(15, $tpid);
# As the timers are so simple programs, we trust them to terminate,
# and use blocking wait for it. We wait just to avoid a zombie.
waitpid($tpid,0);
delete $timers->{'timers'}->{$name}; # Remove the timer information
delete $timers->{'pids'}->{$tpid}; # and PID reference
return 1;
}
mtr_error("Asked to stop timer '$name' not started");
}
sub mtr_timer_stop_all ($) {
my $timers= shift;
foreach my $name ( keys %{$timers->{'timers'}} )
{
mtr_timer_stop($timers, $name);
}
return 1;
}
sub mtr_timer_timeout ($$) {
my ($timers,$pid)= @_;
return "" unless exists $timers->{'pids'}->{$pid};
# Got a timeout(the process with $pid is recorded as being a timer)
# return the name of the timer
return $timers->{'pids'}->{$pid};
}
1;
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