Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revision 74797)
+++ Modules/posixmodule.c	(working copy)
@@ -928,7 +928,9 @@
 {
 	HANDLE hFindFile;
 	WIN32_FIND_DATAA FileData;
+	Py_BEGIN_ALLOW_THREADS
 	hFindFile = FindFirstFileA(pszFile, &FileData);
+	Py_END_ALLOW_THREADS
 	if (hFindFile == INVALID_HANDLE_VALUE)
 		return FALSE;
 	FindClose(hFindFile);
@@ -946,7 +948,9 @@
 {
 	HANDLE hFindFile;
 	WIN32_FIND_DATAW FileData;
+	Py_BEGIN_ALLOW_THREADS
 	hFindFile = FindFirstFileW(pszFile, &FileData);
+	Py_END_ALLOW_THREADS
 	if (hFindFile == INVALID_HANDLE_VALUE)
 		return FALSE;
 	FindClose(hFindFile);
@@ -2107,7 +2111,9 @@
 			free(wnamebuf);
 			return NULL;
 		}
+		Py_BEGIN_ALLOW_THREADS
 		hFindFile = FindFirstFileW(wnamebuf, &wFileData);
+		Py_END_ALLOW_THREADS
 		if (hFindFile == INVALID_HANDLE_VALUE) {
 			int error = GetLastError();
 			if (error == ERROR_FILE_NOT_FOUND) {
@@ -2177,7 +2183,9 @@
 	if ((d = PyList_New(0)) == NULL)
 		return NULL;
 
+	Py_BEGIN_ALLOW_THREADS
 	hFindFile = FindFirstFile(namebuf, &FileData);
+	Py_END_ALLOW_THREADS
 	if (hFindFile == INVALID_HANDLE_VALUE) {
 		int error = GetLastError();
 		if (error == ERROR_FILE_NOT_FOUND)