Adding timeout to new test to prevent stall if created test thread doesn't complete.

Author: tim-weller-wolfssl

test/test_dh.c

@@ -342,6 +342,8 @@ int test_dh_pgen_pkey(ENGINE *e, void *data)
 
 #if !defined(WE_SINGLE_THREADED) && defined(_WIN32)
 
+#define TEST_MT_TIMEOUT 5000 /* Multi-threaded test timeout (ms) */
+
 typedef struct {
     ENGINE* e;
     EVP_PKEY* params;
@@ -366,8 +368,7 @@ int test_dh_key_gen_multithreaded(ENGINE* e, EVP_PKEY* params)
     int err = 1;
 
     thread = CreateThread(NULL, 0, DhKeyGenThreadFunc, &vars, 0, NULL);
-    if (thread) {
-        WaitForSingleObject(thread, INFINITE);
+    if (thread && (WaitForSingleObject(thread, TEST_MT_TIMEOUT) == WAIT_OBJECT_0)) {
         err = (GetExitCodeThread(thread, &threadErr) == 0 ? 1 : threadErr);
         CloseHandle(thread);
     }