crt: test: Check event counter in t_tls_exe_dtor test for main process callback

Verifies that callback registered via __tlregdtor for the main process
thread (which is called after the main function returns) is not called more
than once.

Signed-off-by: LIU Hao <lh_mouse@126.com>

mingw-w64-crt/testcases/t_tls_exe_dtor.c

diff --git a/mingw-w64-crt/testcases/t_tls_exe_dtor.c b/mingw-w64-crt/testcases/t_tls_exe_dtor.c
index 5c3ca76..5ced214 100644
--- a/mingw-w64-crt/testcases/t_tls_exe_dtor.c
+++ b/mingw-w64-crt/testcases/t_tls_exe_dtor.c
@@ -11,11 +11,24 @@
 /* mingw-w64 headers */
 #include "libtest.h"
 
-static int thread_detach = 0;
+extern int __cdecl __tlregdtor(void (__cdecl*func)(void));
 
-static void __cdecl dtor_tls_callback(void)
+static int thread_dtor_counter = 0;
+static int process_dtor_counter = 0;
+
+static void __cdecl thread_dtor_callback(void)
 {
-  thread_detach++;
+  thread_dtor_counter++;
+}
+
+static void __cdecl process_dtor_callback(void)
+{
+  if (process_dtor_counter != 0) {
+    printf("Error after main: dtor TLS callback on main process thread was called more times\n");
+    /* exit, _exit, or ExitProcess calls TLS callbacks, so use TerminateProcess() which is not calling them */
+    TerminateProcess(GetCurrentProcess(), 1);
+  }
+  process_dtor_counter++;
 }
 
 #if defined(__i386__)
@@ -24,10 +37,11 @@
 #endif
 static DWORD WINAPI thread_main(LPVOID user_data __attribute__((unused)))
 {
-  /* Register dtor_tls_callback as oneshot dtor TLS callback */
-  extern int __cdecl __tlregdtor(void (__cdecl*func)(void));
-  if (__tlregdtor(&dtor_tls_callback) != 0)
-    printf("Error: __tlregdtor() failed\n");
+  /* Register thread_dtor_callback as oneshot dtor TLS callback */
+  if (__tlregdtor(&thread_dtor_callback) != 0) {
+    printf("Error: __tlregdtor() on second thread failed\n");
+    return 1;
+  }
   return 0;
 }
 
@@ -62,6 +76,12 @@
     return 77;
   }
 
+  /* Register process_dtor_callback as oneshot dtor TLS callback */
+  if (__tlregdtor(&process_dtor_callback) != 0) {
+    printf("Error: __tlregdtor() on main process thread failed\n");
+    ret = 1;
+  }
+
   printf("Creating new thread\n");
   HANDLE thread = CreateThread(NULL, 0, thread_main, NULL, 0, &(DWORD){0} /*out: ThreadId*/);
   if (!thread) {
@@ -81,14 +101,19 @@
       ret = 1;
     }
 
-    if (thread_detach != 1) {
-      printf("Error: dtor TLS callback for DLL_THREAD_DETACH was not called\n");
+    if (thread_dtor_counter != 1) {
+      printf("Error: dtor TLS callback on second thread was not called\n");
       ret = 1;
     } else {
-      printf("dtor TLS callback for DLL_THREAD_DETACH was called\n");
+      printf("dtor TLS callback on second thread was called\n");
     }
   }
 
+  if (process_dtor_counter != 0) {
+    printf("Error: dtor TLS callback on main process thread was called before exiting process\n");
+    ret = 1;
+  }
+
   if (ret) printf("FAILED\n"); else printf("PASSED\n");
   return ret;
 }