add thread test

tests/include/skipif.inc

@@ -26,6 +26,12 @@ skip(
 (function () {
     global $argv;
     skip_if_php_version_lower_than('7.0');
+    if (defined('SWOOLE_THREAD')) {
+        $targs = Swoole\Thread::getArguments();
+        if ($targs) {
+            $argv = $targs[0];
+        }
+    }
     if (!getenv('PHPT') && substr($argv[0], -4) === '.php') {
         skip('please read ' . dirname(dirname(__FILE__)) . '/README.md and try again');
     }

tests/swoole_thread/lock.phpt

@@ -0,0 +1,35 @@
+--TEST--
+swoole_thread: lock
+--SKIPIF--
+<?php
+require __DIR__ . '/../include/skipif.inc';
+?>
+--FILE--
+<?php
+require __DIR__ . '/../include/bootstrap.php';
+
+use Swoole\Thread;
+use Swoole\Lock;
+
+$args = Thread::getArguments();
+
+if (empty($args)) {
+    global $argv;
+    $lock = new Lock;
+    $lock->lock();
+    $thread = Thread::exec(__FILE__, $argv, $lock);
+    $lock->lock();
+    echo "main thread\n";
+    $thread->join();
+} else {
+    echo "child thread\n";
+    $lock = $args[1];
+    usleep(200_000);
+    $lock->unlock();
+    exit(0);
+}
+?>
+--EXPECTF--
+child thread
+main thread
+