Add test for stream_select with null timeout in coroutine context

Author: EdmondDantes

tests/stream/032-stream_select_null_timeout.phpt

@@ -0,0 +1,93 @@
+--TEST--
+stream_select with null timeout (infinite wait with coroutine yield)
+--FILE--
+<?php
+
+require_once __DIR__ . '/stream_helper.php';
+use function Async\spawn;
+use function Async\awaitAll;
+
+echo "Testing stream_select with null timeout\n";
+
+$sockets = create_socket_pair();
+if (!$sockets) {
+    echo "Failed to create socket pair\n";
+    exit(1);
+}
+
+list($sock1, $sock2) = $sockets;
+
+// Coroutine using stream_select with null timeout (infinite wait)
+$selector = spawn(function() use ($sock2) {
+    echo "Selector: calling stream_select with null timeout\n";
+
+    $read = [$sock2];
+    $write = null;
+    $except = null;
+
+    $start_time = microtime(true);
+    // This should YIELD the coroutine and allow writer to run
+    $result = stream_select($read, $write, $except, null);
+    $elapsed = round((microtime(true) - $start_time) * 1000, 2);
+
+    echo "Selector: stream_select returned after {$elapsed}ms\n";
+
+    if ($result > 0) {
+        echo "Selector: data available\n";
+        $data = fread($sock2, 1024);
+        echo "Selector: read '$data'\n";
+    } else {
+        echo "Selector: ERROR - should have received data!\n";
+    }
+
+    fclose($sock2);
+    return "selector completed";
+});
+
+// Writer coroutine - writes after a small delay
+$writer = spawn(function() use ($sock1) {
+    // Small delay to ensure selector starts first
+    \Async\delay(50);
+
+    echo "Writer: writing data\n";
+    fwrite($sock1, "test data from writer");
+    fflush($sock1);
+    echo "Writer: data written\n";
+
+    fclose($sock1);
+    return "writer completed";
+});
+
+// Worker to demonstrate parallel execution
+$worker = spawn(function() {
+    echo "Worker: executing during stream_select\n";
+    \Async\delay(10);
+    echo "Worker: finished\n";
+    return "worker completed";
+});
+
+list($results, $errors) = awaitAll([$selector, $writer, $worker]);
+
+echo "Results:\n";
+foreach ($results as $i => $result) {
+    echo "  Coroutine $i: $result\n";
+}
+
+echo "Test completed successfully\n";
+
+?>
+--EXPECTF--
+Testing stream_select with null timeout
+Selector: calling stream_select with null timeout
+Worker: executing during stream_select
+Worker: finished
+Writer: writing data
+Writer: data written
+Selector: stream_select returned after %sms
+Selector: data available
+Selector: read 'test data from writer'
+Results:
+  Coroutine 0: selector completed
+  Coroutine 1: writer completed
+  Coroutine 2: worker completed
+Test completed successfully