[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..31\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;

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

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;

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;

use Config;

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 {
    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 ($have_gettimeofday) {
    my ($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 $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 / $T);
	if ($rt <= $limit) {
	    print "ok 30 # dt = $dt, r = $rt\n";
	} else {
	    print "not ok 30 # dt = $dt, rt = $rt\n";
	}
    } else {
	print "# Error: t0 = $t0, t1 = $t1\n";
	skip 30;
    }
} 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;
}

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