1use strict;
2use warnings;
3
4BEGIN {
5    use Config;
6    if (! $Config{'useithreads'}) {
7        print("1..0 # SKIP Perl not compiled with 'useithreads'\n");
8        exit(0);
9    }
10}
11
12use threads;
13use threads::shared;
14use Thread::Semaphore;
15
16if ($] == 5.008) {
17    require './t/test.pl';   # Test::More work-alike for Perl 5.8.0
18} else {
19    require Test::More;
20}
21Test::More->import();
22plan('tests' => 8);
23
24### Basic usage with multiple threads ###
25
26my $sm = Thread::Semaphore->new(0);
27my $st = Thread::Semaphore->new(0);
28ok($sm, 'New Semaphore');
29ok($st, 'New Semaphore');
30
31my $token :shared = 0;
32
33my $thread = threads->create(sub {
34    $st->down_force(2);
35    is($token++, 0, 'Thread got semaphore');
36    $sm->up();
37
38    $st->down();
39    is($token++, 3, 'Thread done');
40    $sm->up();
41});
42
43$sm->down();
44is($token++, 1, 'Main has semaphore');
45$st->up(2);
46threads::yield();
47
48is($token++, 2, 'Main still has semaphore');
49$st->up();
50
51$sm->down();
52is($token, 4, 'Main re-got semaphore');
53
54$thread->join;
55
56ok(1, 'Main done');
57
58exit(0);
59
60# EOF
61