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diff --git a/tests/windows-thread.c b/tests/windows-thread.c
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+/* Creating and controlling threads (native Windows implementation).
+ Copyright (C) 2005-2022 Free Software Foundation, Inc.
+
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ This file is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2005.
+ Based on GCC's gthr-win32.h. */
+
+#include <config.h>
+
+/* Specification. */
+#include "windows-thread.h"
+
+#include <errno.h>
+#include <process.h>
+#include <stdlib.h>
+
+#include "windows-once.h"
+#include "windows-tls.h"
+
+/* The Thread-Local Storage (TLS) key that allows to access each thread's
+ 'struct glwthread_thread_struct *' pointer. */
+static DWORD self_key = (DWORD)-1;
+
+/* Initializes self_key. This function must only be called once. */
+static void
+do_init_self_key (void)
+{
+ self_key = TlsAlloc ();
+ /* If this fails, we're hosed. */
+ if (self_key == (DWORD)-1)
+ abort ();
+}
+
+/* Initializes self_key. */
+static void
+init_self_key (void)
+{
+ static glwthread_once_t once = GLWTHREAD_ONCE_INIT;
+ glwthread_once (&once, do_init_self_key);
+}
+
+/* This structure contains information about a thread.
+ It is stored in TLS under key self_key. */
+struct glwthread_thread_struct
+{
+ /* Fields for managing the handle. */
+ HANDLE volatile handle;
+ CRITICAL_SECTION handle_lock;
+ /* Fields for managing the exit value. */
+ BOOL volatile detached;
+ void * volatile result;
+ /* Fields for managing the thread start. */
+ void * (*func) (void *);
+ void *arg;
+};
+
+/* Return a real HANDLE object for the current thread. */
+static HANDLE
+get_current_thread_handle (void)
+{
+ HANDLE this_handle;
+
+ /* GetCurrentThread() returns a pseudo-handle, i.e. only a symbolic
+ identifier, not a real handle. */
+ if (!DuplicateHandle (GetCurrentProcess (), GetCurrentThread (),
+ GetCurrentProcess (), &this_handle,
+ 0, FALSE, DUPLICATE_SAME_ACCESS))
+ abort ();
+ return this_handle;
+}
+
+glwthread_thread_t
+glwthread_thread_self (void)
+{
+ glwthread_thread_t thread;
+
+ if (self_key == (DWORD)-1)
+ init_self_key ();
+ thread = TlsGetValue (self_key);
+ if (thread == NULL)
+ {
+ /* This happens only in threads that have not been created through
+ glthread_create(), such as the main thread. */
+ for (;;)
+ {
+ thread =
+ (struct glwthread_thread_struct *)
+ malloc (sizeof (struct glwthread_thread_struct));
+ if (thread != NULL)
+ break;
+ /* Memory allocation failed. There is not much we can do. Have to
+ busy-loop, waiting for the availability of memory. */
+ Sleep (1);
+ }
+
+ thread->handle = get_current_thread_handle ();
+ InitializeCriticalSection (&thread->handle_lock);
+ thread->detached = FALSE; /* This can lead to a memory leak. */
+ thread->result = NULL; /* just to be deterministic */
+ TlsSetValue (self_key, thread);
+ }
+ return thread;
+}
+
+/* The main function of a freshly creating thread. It's a wrapper around
+ the FUNC and ARG arguments passed to glthread_create_func. */
+static unsigned int WINAPI
+wrapper_func (void *varg)
+{
+ struct glwthread_thread_struct *thread =
+ (struct glwthread_thread_struct *) varg;
+
+ EnterCriticalSection (&thread->handle_lock);
+ /* Create a new handle for the thread only if the parent thread did not yet
+ fill in the handle. */
+ if (thread->handle == NULL)
+ thread->handle = get_current_thread_handle ();
+ LeaveCriticalSection (&thread->handle_lock);
+
+ if (self_key == (DWORD)-1)
+ init_self_key ();
+ TlsSetValue (self_key, thread);
+
+ /* Run the thread. Store the exit value if the thread was not terminated
+ otherwise. */
+ thread->result = thread->func (thread->arg);
+
+ /* Process the TLS destructors. */
+ glwthread_tls_process_destructors ();
+
+ if (thread->detached)
+ {
+ /* Clean up the thread, like thrd_join would do. */
+ DeleteCriticalSection (&thread->handle_lock);
+ CloseHandle (thread->handle);
+ free (thread);
+ }
+
+ return 0;
+}
+
+int
+glwthread_thread_create (glwthread_thread_t *threadp, unsigned int attr,
+ void * (*func) (void *), void *arg)
+{
+ struct glwthread_thread_struct *thread =
+ (struct glwthread_thread_struct *)
+ malloc (sizeof (struct glwthread_thread_struct));
+ if (thread == NULL)
+ return ENOMEM;
+ thread->handle = NULL;
+ InitializeCriticalSection (&thread->handle_lock);
+ thread->detached = (attr & GLWTHREAD_ATTR_DETACHED ? TRUE : FALSE);
+ thread->result = NULL; /* just to be deterministic */
+ thread->func = func;
+ thread->arg = arg;
+
+ {
+ unsigned int thread_id;
+ HANDLE thread_handle;
+
+ thread_handle = (HANDLE)
+ _beginthreadex (NULL, 100000, wrapper_func, thread, 0, &thread_id);
+ /* calls CreateThread with the same arguments */
+ if (thread_handle == NULL)
+ {
+ DeleteCriticalSection (&thread->handle_lock);
+ free (thread);
+ return EAGAIN;
+ }
+
+ EnterCriticalSection (&thread->handle_lock);
+ if (thread->handle == NULL)
+ thread->handle = thread_handle;
+ else
+ /* thread->handle was already set by the thread itself. */
+ CloseHandle (thread_handle);
+ LeaveCriticalSection (&thread->handle_lock);
+
+ *threadp = thread;
+ return 0;
+ }
+}
+
+int
+glwthread_thread_join (glwthread_thread_t thread, void **retvalp)
+{
+ if (thread == NULL)
+ return EINVAL;
+
+ if (thread == glwthread_thread_self ())
+ return EDEADLK;
+
+ if (thread->detached)
+ return EINVAL;
+
+ if (WaitForSingleObject (thread->handle, INFINITE) == WAIT_FAILED)
+ return EINVAL;
+
+ if (retvalp != NULL)
+ *retvalp = thread->result;
+
+ DeleteCriticalSection (&thread->handle_lock);
+ CloseHandle (thread->handle);
+ free (thread);
+
+ return 0;
+}
+
+int
+glwthread_thread_detach (glwthread_thread_t thread)
+{
+ if (thread == NULL)
+ return EINVAL;
+
+ if (thread->detached)
+ return EINVAL;
+
+ thread->detached = TRUE;
+ return 0;
+}
+
+void
+glwthread_thread_exit (void *retval)
+{
+ glwthread_thread_t thread = glwthread_thread_self ();
+ thread->result = retval;
+ glwthread_tls_process_destructors ();
+ _endthreadex (0); /* calls ExitThread (0) */
+ abort ();
+}