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|
use strict;
use warnings;
BEGIN {
use Config;
if (! $Config{'useithreads'}) {
print("1..0 # SKIP Perl not compiled with 'useithreads'\n");
exit(0);
}
if ($^O eq 'hpux' && $Config{osvers} <= 10.20) {
print("1..0 # SKIP Broken under HP-UX 10.20\n");
exit(0);
}
# https://lists.alioth.debian.org/pipermail/perl-maintainers/2011-June/002285.html
# There _is_ TLS support on m68k, but this stress test is overwhelming
# for the hardware
if ($^O eq 'linux' && $Config{archname} =~ /^m68k/) {
print("1..0 # Skip: m68k doesn't have enough oomph for these stress tests\n");
exit(0);
}
}
use ExtUtils::testlib;
BEGIN {
$| = 1;
print("1..1\n"); ### Number of tests that will be run ###
};
use threads;
use threads::shared;
### Start of Testing ###
#####
#
# Launches a bunch of threads which are then
# restricted to finishing in numerical order
#
#####
{
my $cnt = 50;
# Depending on hardware and compiler options, the time for a busy loop can
# by a factor of (at least) 40, so one size doesn't fit all.
# For a fixed iteration count, on a particularly slow machine the timeout
# can fire before all threads have had a realistic chance to complete, but
# dropping the iteration count will cause fast machines to finish each
# thread too quickly.
# Fastest machine I tested can loop 20,000,000 times a second, slowest
# 500,000
my $busycount;
{
my $tries = 1e4;
# Try to align to the start of a second:
my $want = time + 1;
while (time < $want && --$tries) {
my $sum;
for (0..1e4) {
++$sum;
}
}
if ($tries) {
$tries = 1e4;
++$want;
while (time < $want && --$tries) {
my $sum;
for (0..1e4) {
++$sum;
}
}
# This should be about 0.025s
$busycount = (1e4 - $tries) * 250;
} else {
# Fall back to the old default if everything fails
$busycount = 500000;
}
print "# Looping for $busycount iterations should take about 0.025s\n";
}
my $TIMEOUT = 60;
my $mutex = 1;
share($mutex);
my $warning;
$SIG{__WARN__} = sub { $warning = shift; };
my @threads;
for (reverse(1..$cnt)) {
$threads[$_] = threads->create(sub {
my $tnum = shift;
my $timeout = time() + $TIMEOUT;
threads->yield();
# Randomize the amount of work the thread does
my $sum;
for (0..($busycount+int(rand($busycount)))) {
$sum++
}
# Lock the mutex
lock($mutex);
# Wait for my turn to finish
while ($mutex != $tnum) {
if (! cond_timedwait($mutex, $timeout)) {
if ($mutex == $tnum) {
return ('timed out - cond_broadcast not received');
} else {
return ('timed out');
}
}
}
# Finish up
$mutex++;
cond_broadcast($mutex);
return ('okay');
}, $_);
# Handle thread creation failures
if ($warning) {
my $printit = 1;
if ($warning =~ /returned 11/) {
$warning = "Thread creation failed due to 'No more processes'\n";
$printit = (! $ENV{'PERL_CORE'});
} elsif ($warning =~ /returned 12/) {
$warning = "Thread creation failed due to 'No more memory'\n";
$printit = (! $ENV{'PERL_CORE'});
}
print(STDERR "# Warning: $warning") if ($printit);
lock($mutex);
$mutex = $_ + 1;
last;
}
}
# Gather thread results
my ($okay, $failures, $timeouts, $unknown) = (0, 0, 0, 0, 0);
for (1..$cnt) {
if (! $threads[$_]) {
$failures++;
} else {
my $rc = $threads[$_]->join();
if (! $rc) {
$failures++;
} elsif ($rc =~ /^timed out/) {
$timeouts++;
} elsif ($rc eq 'okay') {
$okay++;
} else {
$unknown++;
print(STDERR "# Unknown error: $rc\n");
}
}
}
if ($failures) {
my $only = $cnt - $failures;
print(STDERR "# Warning: Intended to use $cnt threads, but could only muster $only\n");
$cnt -= $failures;
}
if ($unknown || (($okay + $timeouts) != $cnt)) {
print("not ok 1\n");
my $too_few = $cnt - ($okay + $timeouts + $unknown);
print(STDERR "# Test failed:\n");
print(STDERR "#\t$too_few too few threads reported\n") if $too_few;
print(STDERR "#\t$unknown unknown errors\n") if $unknown;
print(STDERR "#\t$timeouts threads timed out\n") if $timeouts;
} elsif ($timeouts) {
# Frequently fails under MSWin32 due to deadlocking bug in Windows
# hence test is TODO under MSWin32
# https://rt.perl.org/rt3/Public/Bug/Display.html?id=41574
# http://support.microsoft.com/kb/175332
if ($^O eq 'MSWin32') {
print("not ok 1 # TODO - not reliable under MSWin32\n")
} else {
print("not ok 1\n");
print(STDERR "# Test failed: $timeouts threads timed out\n");
}
} else {
print("ok 1\n");
}
}
exit(0);
# EOF
|
