Import Mesa 17.2.8

1 files changed, 7 insertions, 3 deletions

diff --git a/lib/mesa/include/c11/threads_win32.h b/lib/mesa/include/c11/threads_win32.h
index d017c31c3..af7df4b9e 100644
--- a/lib/mesa/include/c11/threads_win32.h
+++ b/lib/mesa/include/c11/threads_win32.h
@@ -502,9 +502,13 @@ thrd_current(void)
     HANDLE hCurrentThread;
     BOOL bRet;
 
-    /* GetCurrentThread() returns a pseudo-handle, which is useless.  We need
-     * to call DuplicateHandle to get a real handle.  However the handle value
-     * will not match the one returned by thread_create.
+    /* GetCurrentThread() returns a pseudo-handle, which we need
+     * to pass to DuplicateHandle(). Only the resulting handle can be used
+     * from other threads.
+     *
+     * Note that neither handle can be compared to the one by thread_create.
+     * Only the thread IDs - as returned by GetThreadId() and GetCurrentThreadId()
+     * can be compared directly.
      *
      * Other potential solutions would be:
      * - define thrd_t as a thread Ids, but this would mean we'd need to OpenThread for many operations