[p5sagit/p5-mst-13.2.git] / ext / Time / HiRes / t / HiRes.t

#!./perl -w

BEGIN {
    if ($ENV{PERL_CORE}) {
	chdir 't' if -d 't';
	@INC = '../lib';
	require Config; import Config;
	if (" $Config{'extensions'} " !~ m[ Time/HiRes ]) {
	    print "1..0 # Skip -- Perl configured without Time::HiRes module\n";
	    exit 0;
	}
    }
}

BEGIN { $| = 1; print "1..33\n"; }

END { print "not ok 1\n" unless $loaded }

use Time::HiRes qw(tv_interval);

$loaded = 1;

print "ok 1\n";

use strict;

my $have_gettimeofday	 = &Time::HiRes::d_gettimeofday;
my $have_usleep		 = &Time::HiRes::d_usleep;
my $have_nanosleep	 = &Time::HiRes::d_nanosleep;
my $have_ualarm		 = &Time::HiRes::d_ualarm;
my $have_clock_gettime	 = &Time::HiRes::d_clock_gettime;
my $have_clock_getres	 = &Time::HiRes::d_clock_getres;
my $have_clock_nanosleep = &Time::HiRes::d_clock_nanosleep;
my $have_clock           = &Time::HiRes::d_clock;

sub has_symbol {
    my $symbol = shift;
    eval "use Time::HiRes qw($symbol)";
    return 0 unless $@ eq '';
    eval "my \$a = $symbol";
    return $@ eq '';
}

printf "# have_gettimeofday    = %d\n", $have_gettimeofday;
printf "# have_usleep          = %d\n", $have_usleep;
printf "# have_nanosleep       = %d\n", $have_nanosleep;
printf "# have_ualarm          = %d\n", $have_ualarm;
printf "# have_clock_gettime   = %d\n", $have_clock_gettime;
printf "# have_clock_getres    = %d\n", $have_clock_getres;
printf "# have_clock_nanosleep = %d\n", $have_clock_nanosleep;
printf "# have_clock           = %d\n", $have_clock;

import Time::HiRes 'gettimeofday'	if $have_gettimeofday;
import Time::HiRes 'usleep'		if $have_usleep;
import Time::HiRes 'nanosleep'		if $have_nanosleep;
import Time::HiRes 'ualarm'		if $have_ualarm;
import Time::HiRes 'clock_gettime'	if $have_clock_gettime;
import Time::HiRes 'clock_getres'	if $have_clock_getres;
import Time::HiRes 'clock_nanosleep'	if $have_clock_nanosleep;
import Time::HiRes 'clock'		if $have_clock;

use Config;

use Time::HiRes qw(gettimeofday);

my $have_alarm = $Config{d_alarm};
my $have_fork  = $Config{d_fork};
my $waitfor = 60; # 10-20 seconds is normal (load affects this).
my $timer_pid;
my $TheEnd;

if ($have_fork) {
    print "# I am the main process $$, starting the timer process...\n";
    $timer_pid = fork();
    if (defined $timer_pid) {
	if ($timer_pid == 0) { # We are the kid, set up the timer.
	    print "# I am the timer process $$, sleeping for $waitfor seconds...\n";
	    sleep($waitfor);
	    warn "\n$0: overall time allowed for tests (${waitfor}s) exceeded!\n";
	    print "# Terminating the main process...\n";
	    kill('TERM', getppid());
	    print "# This is the timer process $$, over and out.\n";
	    exit(0);
	} else {
	    print "# The timer process $timer_pid launched, continuing testing...\n";
	    $TheEnd = time() + $waitfor;
	}
    } else {
	warn "$0: fork failed: $!\n";
    }
} else {
    print "# No timer process (need fork)\n";
}

my $xdefine = ''; 

if (open(XDEFINE, "xdefine")) {
    chomp($xdefine = <XDEFINE>);
    close(XDEFINE);
}

# Ideally, we'd like to test that the timers are rather precise.
# However, if the system is busy, there are no guarantees on how
# quickly we will return.  This limit used to be 10%, but that
# was occasionally triggered falsely.  
# Try 20%.  
# Another possibility might be to print "ok" if the test completes fine
# with (say) 10% slosh, "skip - system may have been busy?" if the test
# completes fine with (say) 30% slosh, and fail otherwise.  If you do that,
# consider changing over to test.pl at the same time.
# --A.D., Nov 27, 2001
my $limit = 0.20; # 20% is acceptable slosh for testing timers

sub skip {
    map { print "ok $_ # skipped\n" } @_;
}

sub ok {
    my ($n, $result, @info) = @_;
    if ($result) {
    	print "ok $n\n";
    }
    else {
	print "not ok $n\n";
    	print "# @info\n" if @info;
    }
}

unless ($have_gettimeofday) {
    skip 2..6;
}
else {
    my @one = gettimeofday();
    ok 2, @one == 2, 'gettimeofday returned ', 0+@one, ' args';
    ok 3, $one[0] > 850_000_000, "@one too small";

    sleep 1;

    my @two = gettimeofday();
    ok 4, ($two[0] > $one[0] || ($two[0] == $one[0] && $two[1] > $one[1])),
    	    "@two is not greater than @one";

    my $f = Time::HiRes::time();
    ok 5, $f > 850_000_000, "$f too small";
    ok 6, $f - $two[0] < 2, "$f - $two[0] >= 2";
}

unless ($have_usleep) {
    skip 7..8;
}
else {
    use Time::HiRes qw(usleep);
    my $one = time;
    usleep(10_000);
    my $two = time;
    usleep(10_000);
    my $three = time;
    ok 7, $one == $two || $two == $three, "slept too long, $one $two $three";

    unless ($have_gettimeofday) {
    	skip 8;
    }
    else {
    	my $f = Time::HiRes::time();
	usleep(500_000);
        my $f2 = Time::HiRes::time();
	my $d = $f2 - $f;
	ok 8, $d > 0.4 && $d < 0.9, "slept $d secs $f to $f2";
    }
}

# Two-arg tv_interval() is always available.
{
    my $f = tv_interval [5, 100_000], [10, 500_000];
    ok 9, abs($f - 5.4) < 0.001, $f;
}

unless ($have_gettimeofday) {
    skip 10;
}
else {
    my $r = [gettimeofday()];
    my $f = tv_interval $r;
    ok 10, $f < 2, $f;
}

unless ($have_usleep && $have_gettimeofday) {
    skip 11;
}
else {
    my $r = [ gettimeofday() ];
    Time::HiRes::sleep( 0.5 );
    my $f = tv_interval $r;
    ok 11, $f > 0.4 && $f < 0.9, "slept $f instead of 0.5 secs.";
}

unless ($have_ualarm && $have_alarm) {
    skip 12..13;
}
else {
    my $tick = 0;
    local $SIG{ ALRM } = sub { $tick++ };

    my $one = time; $tick = 0; ualarm(10_000); while ($tick == 0) { }
    my $two = time; $tick = 0; ualarm(10_000); while ($tick == 0) { }
    my $three = time;
    ok 12, $one == $two || $two == $three, "slept too long, $one $two $three";
    print "# tick = $tick, one = $one, two = $two, three = $three\n";

    $tick = 0; ualarm(10_000, 10_000); while ($tick < 3) { }
    ok 13, 1;
    ualarm(0);
    print "# tick = $tick, one = $one, two = $two, three = $three\n";
}

# Did we even get close?

unless ($have_gettimeofday) {
    skip 14;
} else {
 my ($s, $n, $i) = (0);
 for $i (1 .. 100) {
     $s += Time::HiRes::time() - time();
     $n++;
 }
 # $s should be, at worst, equal to $n
 # (time() may be rounding down, up, or closest)
 ok 14, abs($s) / $n <= 1.0, "Time::HiRes::time() not close to time()";
 print "# s = $s, n = $n, s/n = ", $s/$n, "\n";
}

my $has_ualarm = $Config{d_ualarm};

$has_ualarm ||= $xdefine =~ /-DHAS_UALARM/;

unless (   defined &Time::HiRes::gettimeofday
	&& defined &Time::HiRes::ualarm
	&& defined &Time::HiRes::usleep
	&& $has_ualarm) {
    for (15..17) {
	print "ok $_ # Skip: no gettimeofday or no ualarm or no usleep\n";
    }
} else {
    use Time::HiRes qw(time alarm sleep);

    my ($f, $r, $i, $not, $ok);

    $f = time; 
    print "# time...$f\n";
    print "ok 15\n";

    $r = [Time::HiRes::gettimeofday()];
    sleep (0.5);
    print "# sleep...", Time::HiRes::tv_interval($r), "\nok 16\n";

    $r = [Time::HiRes::gettimeofday()];
    $i = 5;
    $SIG{ALRM} = "tick";
    while ($i > 0)
    {
	alarm(0.3);
	select (undef, undef, undef, 3);
	my $ival = Time::HiRes::tv_interval ($r);
	print "# Select returned! $i $ival\n";
	print "# ", abs($ival/3 - 1), "\n";
	# Whether select() gets restarted after signals is
	# implementation dependent.  If it is restarted, we
	# will get about 3.3 seconds: 3 from the select, 0.3
	# from the alarm.  If this happens, let's just skip
	# this particular test.  --jhi
	if (abs($ival/3.3 - 1) < $limit) {
	    $ok = "Skip: your select() may get restarted by your SIGALRM (or just retry test)";
	    undef $not;
	    last;
	}
	my $exp = 0.3 * (5 - $i);
	# This test is more sensitive, so impose a softer limit.
	if (abs($ival/$exp - 1) > 3*$limit) {
	    my $ratio = abs($ival/$exp);
	    $not = "while: $exp sleep took $ival ratio $ratio";
	    last;
	}
	$ok = $i;
    }

    sub tick
    {
	$i--;
	my $ival = Time::HiRes::tv_interval ($r);
	print "# Tick! $i $ival\n";
	my $exp = 0.3 * (5 - $i);
	# This test is more sensitive, so impose a softer limit.
	if (abs($ival/$exp - 1) > 3*$limit) {
	    my $ratio = abs($ival/$exp);
	    $not = "tick: $exp sleep took $ival ratio $ratio";
	    $i = 0;
	}
    }

    alarm(0); # can't cancel usig %SIG

    print $not ? "not ok 17 # $not\n" : "ok 17 # $ok\n";
}

unless (   defined &Time::HiRes::setitimer
	&& defined &Time::HiRes::getitimer
	&& has_symbol('ITIMER_VIRTUAL')
	&& $Config{sig_name} =~ m/\bVTALRM\b/) {
    for (18..19) {
	print "ok $_ # Skip: no virtual interval timers\n";
    }
} else {
    use Time::HiRes qw(setitimer getitimer ITIMER_VIRTUAL);

    my $i = 3;
    my $r = [Time::HiRes::gettimeofday()];

    $SIG{VTALRM} = sub {
	$i ? $i-- : setitimer(&ITIMER_VIRTUAL, 0);
	print "# Tick! $i ", Time::HiRes::tv_interval($r), "\n";
    };	

    print "# setitimer: ", join(" ", setitimer(ITIMER_VIRTUAL, 0.5, 0.4)), "\n";

    # Assume interval timer granularity of $limit * 0.5 seconds.  Too bold?
    my $virt = getitimer(&ITIMER_VIRTUAL);
    print "not " unless defined $virt && abs($virt / 0.5) - 1 < $limit;
    print "ok 18\n";

    print "# getitimer: ", join(" ", getitimer(ITIMER_VIRTUAL)), "\n";

    while (getitimer(&ITIMER_VIRTUAL)) {
	my $j;
	for (1..1000) { $j++ } # Can't be unbreakable, must test getitimer().
    }

    print "# getitimer: ", join(" ", getitimer(ITIMER_VIRTUAL)), "\n";

    $virt = getitimer(&ITIMER_VIRTUAL);
    print "not " unless defined $virt && $virt == 0;
    print "ok 19\n";

    $SIG{VTALRM} = 'DEFAULT';
}

if ($have_gettimeofday &&
    $have_usleep) {
    use Time::HiRes qw(usleep);

    my ($t0, $td);

    my $sleep = 1.5; # seconds
    my $msg;

    $t0 = gettimeofday();
    $a = abs(sleep($sleep)        / $sleep         - 1.0);
    $td = gettimeofday() - $t0;
    my $ratio = 1.0 + $a;

    $msg = "$td went by while sleeping $sleep, ratio $ratio.\n";

    if ($td < $sleep * (1 + $limit)) {
	print $a < $limit ? "ok 20 # $msg" : "not ok 20 # $msg";
    } else {
	print "ok 20 # Skip: $msg";
    }

    $t0 = gettimeofday();
    $a = abs(usleep($sleep * 1E6) / ($sleep * 1E6) - 1.0);
    $td = gettimeofday() - $t0;
    $ratio = 1.0 + $a;

    $msg = "$td went by while sleeping $sleep, ratio $ratio.\n";

    if ($td < $sleep * (1 + $limit)) {
	print $a < $limit ? "ok 21 # $msg" : "not ok 21 # $msg";
    } else {
	print "ok 21 # Skip: $msg";
    }

} else {
    for (20..21) {
	print "ok $_ # Skip: no gettimeofday\n";
    }
}

unless ($have_nanosleep) {
    skip 22..23;
}
else {
    my $one = CORE::time;
    nanosleep(10_000_000);
    my $two = CORE::time;
    nanosleep(10_000_000);
    my $three = CORE::time;
    ok 22, $one == $two || $two == $three, "slept too long, $one $two $three";

    unless ($have_gettimeofday) {
    	skip 23;
    }
    else {
    	my $f = Time::HiRes::time();
	nanosleep(500_000_000);
        my $f2 = Time::HiRes::time();
	my $d = $f2 - $f;
	ok 23, $d > 0.4 && $d < 0.9, "slept $d secs $f to $f2";
    }
}

eval { sleep(-1) };
print $@ =~ /::sleep\(-1\): negative time not invented yet/ ?
    "ok 24\n" : "not ok 24\n";

eval { usleep(-2) };
print $@ =~ /::usleep\(-2\): negative time not invented yet/ ?
    "ok 25\n" : "not ok 25\n";

if ($have_ualarm) {
    eval { alarm(-3) };
    print $@ =~ /::alarm\(-3, 0\): negative time not invented yet/ ?
	"ok 26\n" : "not ok 26\n";

    eval { ualarm(-4) };
    print $@ =~ /::ualarm\(-4, 0\): negative time not invented yet/ ?
    "ok 27\n" : "not ok 27\n";
} else {
    skip 26;
    skip 27;
}

if ($have_nanosleep) {
    eval { nanosleep(-5) };
    print $@ =~ /::nanosleep\(-5\): negative time not invented yet/ ?
	"ok 28\n" : "not ok 28\n";
} else {
    skip 28;
}

if ($have_ualarm && $] >= 5.008001) {
    # http://groups.google.com/group/perl.perl5.porters/browse_thread/thread/adaffaaf939b042e/20dafc298df737f0%2320dafc298df737f0?sa=X&oi=groupsr&start=0&num=3
    # Perl changes [18765] and [18770], perl bug [perl #20920]

    # First we will find the loop size N (a for() loop 0..N-1)
    # that will take more than T seconds.

    my $T = 0.01;
    use Time::HiRes qw(time);
    my $N = 1024;
    my $i;
    N: {
	do {
	    my $t0 = time();
	    for ($i = 0; $i < $N; $i++) { }
	    my $t1 = time();
	    my $dt = $t1 - $t0;
	    print "# N = $N, t1 = $t1, t0 = $t0, dt = $dt\n";
	    last N if $dt > $T;
	    $N *= 2;
	} while (1);
    }

    # The time-burner which takes at least T seconds.
    my $F = sub {
	my $c = @_ ? shift : 1;
	my $n = $c * $N;
	my $i;
	for ($i = 0; $i < $n; $i++) { }
    };

    # Then we will setup a periodic timer (the two-argument alarm() of
    # Time::HiRes, behind the curtains the libc ualarm()) which has
    # a signal handler that takes so much time (on the first initial
    # invocation) that the first periodic invocation (second invocation)
    # will happen before the first invocation has finished.  In Perl 5.8.0
    # the "safe signals" concept was implemented, with unfortunately at least
    # one bug that caused a core dump on reentering the handler. This bug
    # was fixed by the time of Perl 5.8.1.

    # Do not try mixing sleep() and alarm() for testing this.

    my $a = 0; # Number of alarms we receive.
    my $A = 2; # Number of alarms we will handle before disarming.
               # (We may well get $A + 1 alarms.)

    $SIG{ALRM} = sub {
	$a++;
	print "# Alarm $a - ", time(), "\n";
	alarm(0) if $a >= $A; # Disarm the alarm.
	$F->(2); # Try burning CPU at least for 2T seconds.
    }; 

    use Time::HiRes qw(alarm); 
    alarm($T, $T);  # Arm the alarm.

    $F->(10); # Try burning CPU at least for 10T seconds.

    print "ok 29\n"; # Not core dumping by now is considered to be the success.
} else {
    skip 29;
}

if ($have_clock_gettime &&
    # All implementations of clock_gettime() 
    # are SUPPOSED TO support CLOCK_REALTIME.
    has_symbol('CLOCK_REALTIME')) {
    my $ok = 0;
 TRY: {
	for my $try (1..3) {
	    print "# CLOCK_REALTIME: try = $try\n";
	    my $t0 = clock_gettime(&CLOCK_REALTIME);
	    use Time::HiRes qw(sleep);
	    my $T = 1.5;
	    sleep($T);
	    my $t1 = clock_gettime(&CLOCK_REALTIME);
	    if ($t0 > 0 && $t1 > $t0) {
		print "# t1 = $t1, t0 = $t0\n";
		my $dt = $t1 - $t0;
		my $rt = abs(1 - $dt / $T);
		print "# dt = $dt, rt = $rt\n";
		if ($rt <= 2 * $limit) {
		    $ok = 1;
		    last TRY;
		}
	    } else {
		print "# Error: t0 = $t0, t1 = $t1\n";
	    }
	    my $r = rand() + rand();
	    printf "# Sleeping for %.6f seconds...\n", $r;
	    sleep($r);
	}
    }
    if ($ok) {
	print "ok 30\n";
    } else {
	print "not ok 30\n";
    }
} else {
    print "# No clock_gettime\n";
    skip 30;
}

if ($have_clock_getres) {
    my $tr = clock_getres();
    if ($tr > 0) {
	print "ok 31 # tr = $tr\n";
    } else {
	print "not ok 31 # tr = $tr\n";
    }
} else {
    print "# No clock_getres\n";
    skip 31;
}

if ($have_clock_nanosleep &&
    has_symbol('CLOCK_REALTIME')) {
    my $s = 1.5;
    my $t = clock_nanosleep(&CLOCK_REALTIME, $s);
    my $r = abs(1 - $t / $s);
    if ($r < 2 * $limit) {
	print "ok 32\n";
    } else {
	print "not ok 32 # $t = $t, r = $r\n";
    }
} else {
    print "# No clock_nanosleep\n";
    skip 32;
}

if ($have_clock) {
    my @clock = clock();
    print "# clock = @clock\n";
    for my $i (1..3) {
	for (my $j = 0; $j < 1e6; $j++) { }
	push @clock, clock();
	print "# clock = @clock\n";
    }
    if ($clock[1] > $clock[0] &&
	$clock[2] > $clock[1] &&
	$clock[3] > $clock[2]) {
	print "ok 32\n";
    } else {
	print "not ok 33\n";
    }
} else {
    print "# No clock\n";
    skip 33;
}

END {
    if (defined $timer_pid) {
	my $left = $TheEnd - time();
	printf "# I am the main process $$, terminating the timer process $timer_pid\n# before it terminates me in %d seconds (testing took %d seconds).\n", $left, $waitfor - $left;
	kill('TERM', $timer_pid); # We are done, the timer can go.
	unlink("ktrace.out"); # Used in BSD system call tracing.
	print "# All done.\n";
    }
}
Commit	Line	Data
88cb3de1	1	#!./perl -w
88cb3de1	2
dcf686c9	3	BEGIN {
3f2ee006	4	if ($ENV{PERL_CORE}) {
	5	chdir 't' if -d 't';
	6	@INC = '../lib';
df2f6354	7	require Config; import Config;
	8	if (" $Config{'extensions'} " !~ m[ Time/HiRes ]) {
	9	print "1..0 # Skip -- Perl configured without Time::HiRes module\n";
	10	exit 0;
	11	}
3f2ee006	12	}
dcf686c9	13	}
dcf686c9	14
170c5524	15	BEGIN { $\| = 1; print "1..33\n"; }
dcf686c9	16
0cf8ddea	17	END { print "not ok 1\n" unless $loaded }
dcf686c9	18
	19	use Time::HiRes qw(tv_interval);
	20
	21	$loaded = 1;
	22
	23	print "ok 1\n";
	24
	25	use strict;
	26
170c5524	27	my $have_gettimeofday = &Time::HiRes::d_gettimeofday;
	28	my $have_usleep = &Time::HiRes::d_usleep;
	29	my $have_nanosleep = &Time::HiRes::d_nanosleep;
	30	my $have_ualarm = &Time::HiRes::d_ualarm;
	31	my $have_clock_gettime = &Time::HiRes::d_clock_gettime;
	32	my $have_clock_getres = &Time::HiRes::d_clock_getres;
	33	my $have_clock_nanosleep = &Time::HiRes::d_clock_nanosleep;
	34	my $have_clock = &Time::HiRes::d_clock;
dcf686c9	35
b311af62	36	sub has_symbol {
b311af62	37	my $symbol = shift;
a5929ff3	38	eval "use Time::HiRes qw($symbol)";
b311af62	39	return 0 unless $@ eq '';
a5929ff3	40	eval "my \$a = $symbol";
a5929ff3	41	return $@ eq '';
b311af62	42	}
b311af62	43
170c5524	44	printf "# have_gettimeofday = %d\n", $have_gettimeofday;
	45	printf "# have_usleep = %d\n", $have_usleep;
	46	printf "# have_nanosleep = %d\n", $have_nanosleep;
	47	printf "# have_ualarm = %d\n", $have_ualarm;
	48	printf "# have_clock_gettime = %d\n", $have_clock_gettime;
	49	printf "# have_clock_getres = %d\n", $have_clock_getres;
	50	printf "# have_clock_nanosleep = %d\n", $have_clock_nanosleep;
	51	printf "# have_clock = %d\n", $have_clock;
3d0346a5	52
dcf686c9	53	import Time::HiRes 'gettimeofday' if $have_gettimeofday;
dcf686c9	54	import Time::HiRes 'usleep' if $have_usleep;
44d3ce20	55	import Time::HiRes 'nanosleep' if $have_nanosleep;
dcf686c9	56	import Time::HiRes 'ualarm' if $have_ualarm;
ced84e60	57	import Time::HiRes 'clock_gettime' if $have_clock_gettime;
ced84e60	58	import Time::HiRes 'clock_getres' if $have_clock_getres;
170c5524	59	import Time::HiRes 'clock_nanosleep' if $have_clock_nanosleep;
170c5524	60	import Time::HiRes 'clock' if $have_clock;
dcf686c9	61
3c72ec00	62	use Config;
3c72ec00	63
82cbdcc3	64	use Time::HiRes qw(gettimeofday);
82cbdcc3	65
690f7c5f	66	my $have_alarm = $Config{d_alarm};
690f7c5f	67	my $have_fork = $Config{d_fork};
3d0346a5	68	my $waitfor = 60; # 10-20 seconds is normal (load affects this).
3d0346a5	69	my $timer_pid;
b311af62	70	my $TheEnd;
690f7c5f	71
690f7c5f	72	if ($have_fork) {
3d0346a5	73	print "# I am the main process $$, starting the timer process...\n";
	74	$timer_pid = fork();
	75	if (defined $timer_pid) {
	76	if ($timer_pid == 0) { # We are the kid, set up the timer.
	77	print "# I am the timer process $$, sleeping for $waitfor seconds...\n";
690f7c5f	78	sleep($waitfor);
3d0346a5	79	warn "\n$0: overall time allowed for tests (${waitfor}s) exceeded!\n";
3d0346a5	80	print "# Terminating the main process...\n";
690f7c5f	81	kill('TERM', getppid());
3d0346a5	82	print "# This is the timer process $$, over and out.\n";
690f7c5f	83	exit(0);
3d0346a5	84	} else {
b311af62	85	print "# The timer process $timer_pid launched, continuing testing...\n";
b311af62	86	$TheEnd = time() + $waitfor;
690f7c5f	87	}
	88	} else {
	89	warn "$0: fork failed: $!\n";
	90	}
	91	} else {
3d0346a5	92	print "# No timer process (need fork)\n";
690f7c5f	93	}
690f7c5f	94
12724655	95	my $xdefine = '';
3f2ee006	96
	97	if (open(XDEFINE, "xdefine")) {
	98	chomp($xdefine = <XDEFINE>);
	99	close(XDEFINE);
	100	}
	101
0740bb5b	102	# Ideally, we'd like to test that the timers are rather precise.
	103	# However, if the system is busy, there are no guarantees on how
	104	# quickly we will return. This limit used to be 10%, but that
	105	# was occasionally triggered falsely.
	106	# Try 20%.
	107	# Another possibility might be to print "ok" if the test completes fine
	108	# with (say) 10% slosh, "skip - system may have been busy?" if the test
	109	# completes fine with (say) 30% slosh, and fail otherwise. If you do that,
	110	# consider changing over to test.pl at the same time.
	111	# --A.D., Nov 27, 2001
	112	my $limit = 0.20; # 20% is acceptable slosh for testing timers
	113
dcf686c9	114	sub skip {
3f2ee006	115	map { print "ok $_ # skipped\n" } @_;
dcf686c9	116	}
	117
	118	sub ok {
	119	my ($n, $result, @info) = @_;
	120	if ($result) {
	121	print "ok $n\n";
	122	}
	123	else {
	124	print "not ok $n\n";
	125	print "# @info\n" if @info;
	126	}
	127	}
	128
3d0346a5	129	unless ($have_gettimeofday) {
dcf686c9	130	skip 2..6;
	131	}
	132	else {
	133	my @one = gettimeofday();
	134	ok 2, @one == 2, 'gettimeofday returned ', 0+@one, ' args';
	135	ok 3, $one[0] > 850_000_000, "@one too small";
	136
	137	sleep 1;
	138
	139	my @two = gettimeofday();
	140	ok 4, ($two[0] > $one[0] \|\| ($two[0] == $one[0] && $two[1] > $one[1])),
	141	"@two is not greater than @one";
	142
c9ff6e92	143	my $f = Time::HiRes::time();
dcf686c9	144	ok 5, $f > 850_000_000, "$f too small";
0740bb5b	145	ok 6, $f - $two[0] < 2, "$f - $two[0] >= 2";
dcf686c9	146	}
dcf686c9	147
3d0346a5	148	unless ($have_usleep) {
dcf686c9	149	skip 7..8;
	150	}
	151	else {
82cbdcc3	152	use Time::HiRes qw(usleep);
dcf686c9	153	my $one = time;
	154	usleep(10_000);
	155	my $two = time;
	156	usleep(10_000);
	157	my $three = time;
	158	ok 7, $one == $two \|\| $two == $three, "slept too long, $one $two $three";
	159
3d0346a5	160	unless ($have_gettimeofday) {
dcf686c9	161	skip 8;
	162	}
	163	else {
c9ff6e92	164	my $f = Time::HiRes::time();
dcf686c9	165	usleep(500_000);
c9ff6e92	166	my $f2 = Time::HiRes::time();
dcf686c9	167	my $d = $f2 - $f;
0740bb5b	168	ok 8, $d > 0.4 && $d < 0.9, "slept $d secs $f to $f2";
dcf686c9	169	}
	170	}
	171
	172	# Two-arg tv_interval() is always available.
	173	{
	174	my $f = tv_interval [5, 100_000], [10, 500_000];
6cf89afa	175	ok 9, abs($f - 5.4) < 0.001, $f;
dcf686c9	176	}
dcf686c9	177
3d0346a5	178	unless ($have_gettimeofday) {
dcf686c9	179	skip 10;
	180	}
	181	else {
	182	my $r = [gettimeofday()];
	183	my $f = tv_interval $r;
	184	ok 10, $f < 2, $f;
	185	}
	186
3d0346a5	187	unless ($have_usleep && $have_gettimeofday) {
dcf686c9	188	skip 11;
	189	}
	190	else {
82cbdcc3	191	my $r = [ gettimeofday() ];
dcf686c9	192	Time::HiRes::sleep( 0.5 );
dcf686c9	193	my $f = tv_interval $r;
0740bb5b	194	ok 11, $f > 0.4 && $f < 0.9, "slept $f instead of 0.5 secs.";
dcf686c9	195	}
dcf686c9	196
3d0346a5	197	unless ($have_ualarm && $have_alarm) {
dcf686c9	198	skip 12..13;
	199	}
	200	else {
	201	my $tick = 0;
64a7a97c	202	local $SIG{ ALRM } = sub { $tick++ };
dcf686c9	203
64a7a97c	204	my $one = time; $tick = 0; ualarm(10_000); while ($tick == 0) { }
64a7a97c	205	my $two = time; $tick = 0; ualarm(10_000); while ($tick == 0) { }
dcf686c9	206	my $three = time;
dcf686c9	207	ok 12, $one == $two \|\| $two == $three, "slept too long, $one $two $three";
64a7a97c	208	print "# tick = $tick, one = $one, two = $two, three = $three\n";
dcf686c9	209
64a7a97c	210	$tick = 0; ualarm(10_000, 10_000); while ($tick < 3) { }
dcf686c9	211	ok 13, 1;
dcf686c9	212	ualarm(0);
64a7a97c	213	print "# tick = $tick, one = $one, two = $two, three = $three\n";
dcf686c9	214	}
dcf686c9	215
64a7a97c	216	# Did we even get close?
dcf686c9	217
ced84e60	218	unless ($have_gettimeofday) {
64a7a97c	219	skip 14;
c9ff6e92	220	} else {
1fbb4de4	221	my ($s, $n, $i) = (0);
1fbb4de4	222	for $i (1 .. 100) {
456811e8	223	$s += Time::HiRes::time() - time();
456811e8	224	$n++;
64cc9c1c	225	}
456811e8	226	# $s should be, at worst, equal to $n
	227	# (time() may be rounding down, up, or closest)
	228	ok 14, abs($s) / $n <= 1.0, "Time::HiRes::time() not close to time()";
	229	print "# s = $s, n = $n, s/n = ", $s/$n, "\n";
dcf686c9	230	}
dcf686c9	231
3f2ee006	232	my $has_ualarm = $Config{d_ualarm};
	233
	234	$has_ualarm \|\|= $xdefine =~ /-DHAS_UALARM/;
	235
	236	unless ( defined &Time::HiRes::gettimeofday
dcf686c9	237	&& defined &Time::HiRes::ualarm
c7f7de79	238	&& defined &Time::HiRes::usleep
3f2ee006	239	&& $has_ualarm) {
dcf686c9	240	for (15..17) {
3f2ee006	241	print "ok $_ # Skip: no gettimeofday or no ualarm or no usleep\n";
dcf686c9	242	}
dcf686c9	243	} else {
ced84e60	244	use Time::HiRes qw(time alarm sleep);
dcf686c9	245
cb203acc	246	my ($f, $r, $i, $not, $ok);
dcf686c9	247
dcf686c9	248	$f = time;
add58217	249	print "# time...$f\n";
add58217	250	print "ok 15\n";
dcf686c9	251
c9ff6e92	252	$r = [Time::HiRes::gettimeofday()];
dcf686c9	253	sleep (0.5);
add58217	254	print "# sleep...", Time::HiRes::tv_interval($r), "\nok 16\n";
dcf686c9	255
c9ff6e92	256	$r = [Time::HiRes::gettimeofday()];
dcf686c9	257	$i = 5;
dcf686c9	258	$SIG{ALRM} = "tick";
6ea166ef	259	while ($i > 0)
dcf686c9	260	{
0e172911	261	alarm(0.3);
c7f7de79	262	select (undef, undef, undef, 3);
	263	my $ival = Time::HiRes::tv_interval ($r);
	264	print "# Select returned! $i $ival\n";
cb203acc	265	print "# ", abs($ival/3 - 1), "\n";
	266	# Whether select() gets restarted after signals is
	267	# implementation dependent. If it is restarted, we
	268	# will get about 3.3 seconds: 3 from the select, 0.3
	269	# from the alarm. If this happens, let's just skip
	270	# this particular test. --jhi
	271	if (abs($ival/3.3 - 1) < $limit) {
3f2ee006	272	$ok = "Skip: your select() may get restarted by your SIGALRM (or just retry test)";
cb203acc	273	undef $not;
	274	last;
	275	}
c7f7de79	276	my $exp = 0.3 * (5 - $i);
0740bb5b	277	# This test is more sensitive, so impose a softer limit.
cb203acc	278	if (abs($ival/$exp - 1) > 3*$limit) {
0740bb5b	279	my $ratio = abs($ival/$exp);
0740bb5b	280	$not = "while: $exp sleep took $ival ratio $ratio";
c7f7de79	281	last;
c7f7de79	282	}
cb203acc	283	$ok = $i;
dcf686c9	284	}
	285
	286	sub tick
	287	{
dcf686c9	288	$i--;
c7f7de79	289	my $ival = Time::HiRes::tv_interval ($r);
	290	print "# Tick! $i $ival\n";
	291	my $exp = 0.3 * (5 - $i);
0740bb5b	292	# This test is more sensitive, so impose a softer limit.
cb203acc	293	if (abs($ival/$exp - 1) > 3*$limit) {
0740bb5b	294	my $ratio = abs($ival/$exp);
0740bb5b	295	$not = "tick: $exp sleep took $ival ratio $ratio";
c7f7de79	296	$i = 0;
c7f7de79	297	}
dcf686c9	298	}
c7f7de79	299
d0b83b2b	300	alarm(0); # can't cancel usig %SIG
dcf686c9	301
cb203acc	302	print $not ? "not ok 17 # $not\n" : "ok 17 # $ok\n";
dcf686c9	303	}
dcf686c9	304
3f2ee006	305	unless ( defined &Time::HiRes::setitimer
3c72ec00	306	&& defined &Time::HiRes::getitimer
b311af62	307	&& has_symbol('ITIMER_VIRTUAL')
d0b83b2b	308	&& $Config{sig_name} =~ m/\bVTALRM\b/) {
3c72ec00	309	for (18..19) {
0e172911	310	print "ok $_ # Skip: no virtual interval timers\n";
3c72ec00	311	}
3c72ec00	312	} else {
b311af62	313	use Time::HiRes qw(setitimer getitimer ITIMER_VIRTUAL);
3c72ec00	314
3c72ec00	315	my $i = 3;
c9ff6e92	316	my $r = [Time::HiRes::gettimeofday()];
3c72ec00	317
3c72ec00	318	$SIG{VTALRM} = sub {
b311af62	319	$i ? $i-- : setitimer(&ITIMER_VIRTUAL, 0);
3c72ec00	320	print "# Tick! $i ", Time::HiRes::tv_interval($r), "\n";
	321	};
	322
0e172911	323	print "# setitimer: ", join(" ", setitimer(ITIMER_VIRTUAL, 0.5, 0.4)), "\n";
0e172911	324
0740bb5b	325	# Assume interval timer granularity of $limit * 0.5 seconds. Too bold?
b311af62	326	my $virt = getitimer(&ITIMER_VIRTUAL);
4ed0e2d4	327	print "not " unless defined $virt && abs($virt / 0.5) - 1 < $limit;
0e172911	328	print "ok 18\n";
3c72ec00	329
	330	print "# getitimer: ", join(" ", getitimer(ITIMER_VIRTUAL)), "\n";
	331
b311af62	332	while (getitimer(&ITIMER_VIRTUAL)) {
3f2ee006	333	my $j;
3f2ee006	334	for (1..1000) { $j++ } # Can't be unbreakable, must test getitimer().
3c72ec00	335	}
	336
	337	print "# getitimer: ", join(" ", getitimer(ITIMER_VIRTUAL)), "\n";
	338
b311af62	339	$virt = getitimer(&ITIMER_VIRTUAL);
4ed0e2d4	340	print "not " unless defined $virt && $virt == 0;
0e172911	341	print "ok 19\n";
0e172911	342
3c72ec00	343	$SIG{VTALRM} = 'DEFAULT';
	344	}
	345
82cbdcc3	346	if ($have_gettimeofday &&
	347	$have_usleep) {
	348	use Time::HiRes qw(usleep);
	349
9c735d59	350	my ($t0, $td);
52d72fba	351
9c735d59	352	my $sleep = 1.5; # seconds
9c735d59	353	my $msg;
	354
	355	$t0 = gettimeofday();
	356	$a = abs(sleep($sleep) / $sleep - 1.0);
	357	$td = gettimeofday() - $t0;
0740bb5b	358	my $ratio = 1.0 + $a;
9c735d59	359
0740bb5b	360	$msg = "$td went by while sleeping $sleep, ratio $ratio.\n";
9c735d59	361
	362	if ($td < $sleep * (1 + $limit)) {
	363	print $a < $limit ? "ok 20 # $msg" : "not ok 20 # $msg";
	364	} else {
	365	print "ok 20 # Skip: $msg";
	366	}
	367
	368	$t0 = gettimeofday();
	369	$a = abs(usleep($sleep * 1E6) / ($sleep * 1E6) - 1.0);
	370	$td = gettimeofday() - $t0;
0740bb5b	371	$ratio = 1.0 + $a;
9c735d59	372
0740bb5b	373	$msg = "$td went by while sleeping $sleep, ratio $ratio.\n";
9c735d59	374
	375	if ($td < $sleep * (1 + $limit)) {
	376	print $a < $limit ? "ok 21 # $msg" : "not ok 21 # $msg";
	377	} else {
	378	print "ok 21 # Skip: $msg";
	379	}
	380
	381	} else {
	382	for (20..21) {
	383	print "ok $_ # Skip: no gettimeofday\n";
	384	}
	385	}
52d72fba	386
3d0346a5	387	unless ($have_nanosleep) {
44d3ce20	388	skip 22..23;
	389	}
	390	else {
	391	my $one = CORE::time;
	392	nanosleep(10_000_000);
	393	my $two = CORE::time;
	394	nanosleep(10_000_000);
	395	my $three = CORE::time;
	396	ok 22, $one == $two \|\| $two == $three, "slept too long, $one $two $three";
	397
3d0346a5	398	unless ($have_gettimeofday) {
44d3ce20	399	skip 23;
	400	}
	401	else {
	402	my $f = Time::HiRes::time();
	403	nanosleep(500_000_000);
	404	my $f2 = Time::HiRes::time();
	405	my $d = $f2 - $f;
	406	ok 23, $d > 0.4 && $d < 0.9, "slept $d secs $f to $f2";
	407	}
	408	}
	409
f7916ddb	410	eval { sleep(-1) };
f7916ddb	411	print $@ =~ /::sleep\(-1\): negative time not invented yet/ ?
44d3ce20	412	"ok 24\n" : "not ok 24\n";
f7916ddb	413
	414	eval { usleep(-2) };
	415	print $@ =~ /::usleep\(-2\): negative time not invented yet/ ?
44d3ce20	416	"ok 25\n" : "not ok 25\n";
f7916ddb	417
ec77158c	418	if ($have_ualarm) {
c46d5038	419	eval { alarm(-3) };
c46d5038	420	print $@ =~ /::alarm\(-3, 0\): negative time not invented yet/ ?
44d3ce20	421	"ok 26\n" : "not ok 26\n";
c46d5038	422
ec77158c	423	eval { ualarm(-4) };
ec77158c	424	print $@ =~ /::ualarm\(-4, 0\): negative time not invented yet/ ?
44d3ce20	425	"ok 27\n" : "not ok 27\n";
	426	} else {
	427	skip 26;
	428	skip 27;
	429	}
	430
	431	if ($have_nanosleep) {
	432	eval { nanosleep(-5) };
	433	print $@ =~ /::nanosleep\(-5\): negative time not invented yet/ ?
	434	"ok 28\n" : "not ok 28\n";
ec77158c	435	} else {
44d3ce20	436	skip 28;
ec77158c	437	}
690f7c5f	438
3d0346a5	439	if ($have_ualarm && $] >= 5.008001) {
	440	# http://groups.google.com/group/perl.perl5.porters/browse_thread/thread/adaffaaf939b042e/20dafc298df737f0%2320dafc298df737f0?sa=X&oi=groupsr&start=0&num=3
	441	# Perl changes [18765] and [18770], perl bug [perl #20920]
ced84e60	442
	443	# First we will find the loop size N (a for() loop 0..N-1)
	444	# that will take more than T seconds.
	445
	446	my $T = 0.01;
	447	use Time::HiRes qw(time);
	448	my $N = 1024;
	449	my $i;
	450	N: {
	451	do {
	452	my $t0 = time();
	453	for ($i = 0; $i < $N; $i++) { }
	454	my $t1 = time();
	455	my $dt = $t1 - $t0;
	456	print "# N = $N, t1 = $t1, t0 = $t0, dt = $dt\n";
	457	last N if $dt > $T;
	458	$N *= 2;
	459	} while (1);
	460	}
	461
	462	# The time-burner which takes at least T seconds.
	463	my $F = sub {
	464	my $c = @_ ? shift : 1;
	465	my $n = $c * $N;
	466	my $i;
	467	for ($i = 0; $i < $n; $i++) { }
	468	};
	469
	470	# Then we will setup a periodic timer (the two-argument alarm() of
	471	# Time::HiRes, behind the curtains the libc ualarm()) which has
	472	# a signal handler that takes so much time (on the first initial
	473	# invocation) that the first periodic invocation (second invocation)
	474	# will happen before the first invocation has finished. In Perl 5.8.0
	475	# the "safe signals" concept was implemented, with unfortunately at least
	476	# one bug that caused a core dump on reentering the handler. This bug
	477	# was fixed by the time of Perl 5.8.1.
	478
b311af62	479	# Do not try mixing sleep() and alarm() for testing this.
b311af62	480
ced84e60	481	my $a = 0; # Number of alarms we receive.
	482	my $A = 2; # Number of alarms we will handle before disarming.
	483	# (We may well get $A + 1 alarms.)
	484
	485	$SIG{ALRM} = sub {
	486	$a++;
	487	print "# Alarm $a - ", time(), "\n";
	488	alarm(0) if $a >= $A; # Disarm the alarm.
	489	$F->(2); # Try burning CPU at least for 2T seconds.
	490	};
	491
3d0346a5	492	use Time::HiRes qw(alarm);
ced84e60	493	alarm($T, $T); # Arm the alarm.
	494
	495	$F->(10); # Try burning CPU at least for 10T seconds.
	496
3d0346a5	497	print "ok 29\n"; # Not core dumping by now is considered to be the success.
	498	} else {
	499	skip 29;
	500	}
	501
b311af62	502	if ($have_clock_gettime &&
	503	# All implementations of clock_gettime()
	504	# are SUPPOSED TO support CLOCK_REALTIME.
	505	has_symbol('CLOCK_REALTIME')) {
a5929ff3	506	my $ok = 0;
	507	TRY: {
	508	for my $try (1..3) {
	509	print "# CLOCK_REALTIME: try = $try\n";
	510	my $t0 = clock_gettime(&CLOCK_REALTIME);
	511	use Time::HiRes qw(sleep);
	512	my $T = 1.5;
	513	sleep($T);
	514	my $t1 = clock_gettime(&CLOCK_REALTIME);
	515	if ($t0 > 0 && $t1 > $t0) {
	516	print "# t1 = $t1, t0 = $t0\n";
	517	my $dt = $t1 - $t0;
	518	my $rt = abs(1 - $dt / $T);
	519	print "# dt = $dt, rt = $rt\n";
	520	if ($rt <= 2 * $limit) {
	521	$ok = 1;
	522	last TRY;
	523	}
	524	} else {
	525	print "# Error: t0 = $t0, t1 = $t1\n";
	526	}
	527	my $r = rand() + rand();
170c5524	528	printf "# Sleeping for %.6f seconds...\n", $r;
a5929ff3	529	sleep($r);
ced84e60	530	}
a5929ff3	531	}
	532	if ($ok) {
	533	print "ok 30\n";
ced84e60	534	} else {
a5929ff3	535	print "not ok 30\n";
ced84e60	536	}
	537	} else {
	538	print "# No clock_gettime\n";
	539	skip 30;
	540	}
	541
	542	if ($have_clock_getres) {
	543	my $tr = clock_getres();
170c5524	544	if ($tr > 0) {
	545	print "ok 31 # tr = $tr\n";
	546	} else {
	547	print "not ok 31 # tr = $tr\n";
	548	}
ced84e60	549	} else {
	550	print "# No clock_getres\n";
	551	skip 31;
	552	}
	553
170c5524	554	if ($have_clock_nanosleep &&
	555	has_symbol('CLOCK_REALTIME')) {
	556	my $s = 1.5;
	557	my $t = clock_nanosleep(&CLOCK_REALTIME, $s);
	558	my $r = abs(1 - $t / $s);
	559	if ($r < 2 * $limit) {
	560	print "ok 32\n";
	561	} else {
	562	print "not ok 32 # $t = $t, r = $r\n";
	563	}
	564	} else {
	565	print "# No clock_nanosleep\n";
	566	skip 32;
	567	}
	568
	569	if ($have_clock) {
	570	my @clock = clock();
	571	print "# clock = @clock\n";
	572	for my $i (1..3) {
	573	for (my $j = 0; $j < 1e6; $j++) { }
	574	push @clock, clock();
	575	print "# clock = @clock\n";
	576	}
	577	if ($clock[1] > $clock[0] &&
	578	$clock[2] > $clock[1] &&
	579	$clock[3] > $clock[2]) {
	580	print "ok 32\n";
	581	} else {
	582	print "not ok 33\n";
	583	}
	584	} else {
	585	print "# No clock\n";
	586	skip 33;
	587	}
	588
3d0346a5	589	END {
3d0346a5	590	if (defined $timer_pid) {
b311af62	591	my $left = $TheEnd - time();
b311af62	592	printf "# I am the main process $$, terminating the timer process $timer_pid\n# before it terminates me in %d seconds (testing took %d seconds).\n", $left, $waitfor - $left;
3d0346a5	593	kill('TERM', $timer_pid); # We are done, the timer can go.
	594	unlink("ktrace.out"); # Used in BSD system call tracing.
	595	print "# All done.\n";
	596	}
690f7c5f	597	}
690f7c5f	598