winpthreads: also use SetThreadDescription to set thread name

Using SetThreadDescription has the advantage that on recent Visual
Studio / Windows, the thread name is always available regardless of
whether a debugger was attached, is also available in crash dumps, and
to other tools.

Quoting MSDN at Set a thread name in C/C++:
https://learn.microsoft.com/en-us/visualstudio/debugger/tips-for-debugging-threads?view=vs-2022&tabs=csharp#set-a-thread-name-in-cc

> There are two ways to set a thread name. The first is via the
> SetThreadDescription function. The second is by throwing a
> particular exception while the Visual Studio debugger is attached to
> the process. Each approach has benefits and caveats. The use of
> SetThreadDescription is supported starting in Windows 10 version
> 1607 or Windows Server 2016.
>
> It's worth noting that both approaches can be used together, if
> desired, since the mechanisms by which they work are independent of
> each other.

Signed-off-by: Antonin Décimo <antonin@tarides.com>
Signed-off-by: LIU Hao <lh_mouse@126.com>

mingw-w64-libraries/winpthreads/src/misc.c

diff --git a/mingw-w64-libraries/winpthreads/src/misc.c b/mingw-w64-libraries/winpthreads/src/misc.c
index b56e8a1..c426f59 100644
--- a/mingw-w64-libraries/winpthreads/src/misc.c
+++ b/mingw-w64-libraries/winpthreads/src/misc.c
@@ -26,6 +26,7 @@
 
 void (WINAPI *_pthread_get_system_time_best_as_file_time) (LPFILETIME) = NULL;
 static ULONGLONG (WINAPI *_pthread_get_tick_count_64) (VOID);
+HRESULT (WINAPI *_pthread_set_thread_description) (HANDLE, PCWSTR) = NULL;
 
 #if defined(__GNUC__) || defined(__clang__)
 __attribute__((constructor(0)))
@@ -46,6 +47,13 @@
     if (!_pthread_get_system_time_best_as_file_time)
         /* >15ms precision on Windows 10 */
         _pthread_get_system_time_best_as_file_time = GetSystemTimeAsFileTime;
+
+    mod = GetModuleHandleA("kernelbase.dll");
+    if (mod)
+    {
+        _pthread_set_thread_description =
+            (HRESULT (WINAPI *)(HANDLE, PCWSTR))(void*) GetProcAddress(mod, "SetThreadDescription");
+    }
 }
 
 #if defined(_MSC_VER) && !defined(__clang__)

mingw-w64-libraries/winpthreads/src/misc.h

diff --git a/mingw-w64-libraries/winpthreads/src/misc.h b/mingw-w64-libraries/winpthreads/src/misc.h
index edefb0d..a853dd0 100644
--- a/mingw-w64-libraries/winpthreads/src/misc.h
+++ b/mingw-w64-libraries/winpthreads/src/misc.h
@@ -108,6 +108,7 @@
 unsigned long _pthread_wait_for_multiple_objects (unsigned long count, void **handles, unsigned int all, unsigned long timeout);
 
 extern void (WINAPI *_pthread_get_system_time_best_as_file_time) (LPFILETIME);
+extern HRESULT (WINAPI *_pthread_set_thread_description) (HANDLE, PCWSTR);
 
 #if defined(__GNUC__) || defined(__clang__)
 #define likely(cond) __builtin_expect((cond) != 0, 1)

mingw-w64-libraries/winpthreads/src/thread.c

diff --git a/mingw-w64-libraries/winpthreads/src/thread.c b/mingw-w64-libraries/winpthreads/src/thread.c
index 3fc5ced..68858cf 100644
--- a/mingw-w64-libraries/winpthreads/src/thread.c
+++ b/mingw-w64-libraries/winpthreads/src/thread.c
@@ -1877,6 +1877,21 @@
 
   tv->thread_name = stored_name;
   SetThreadName (tv->tid, name);
+
+  if (_pthread_set_thread_description != NULL)
+    {
+      size_t required_size = mbstowcs(NULL, name, 0);
+      if (required_size != (size_t)-1)
+        {
+          wchar_t *wname = malloc((required_size + 1) * sizeof(wchar_t));
+          if (wname != NULL)
+            {
+              mbstowcs(wname, name, required_size + 1);
+              _pthread_set_thread_description(tv->h, wname);
+              free(wname);
+            }
+        }
+    }
   return 0;
 }