ntdll: Add native thread renaming for macOS.

dlls/ntdll/unix/thread.c

@@ -59,6 +59,10 @@
 #include <libprocstat.h>
 #endif
 
+#ifdef __APPLE__
+#include <mach/mach.h>
+#endif
+
 #define NONAMELESSUNION
 #define NONAMELESSSTRUCT
 #include "ntstatus.h"
@@ -1876,6 +1880,40 @@ static void set_native_thread_name( HANDLE handle, const UNICODE_STRING *name )
         write( fd, nameA, len );
         close( fd );
     }
+#elif defined(__APPLE__)
+    /* pthread_setname_np() silently fails if the name is longer than 63 characters + null terminator */
+    char nameA[64];
+    NTSTATUS status;
+    int unix_pid, unix_tid, len, current_tid;
+
+    SERVER_START_REQ( get_thread_times )
+    {
+        req->handle = wine_server_obj_handle( handle );
+        status = wine_server_call( req );
+        if (status == STATUS_SUCCESS)
+        {
+            unix_pid = reply->unix_pid;
+            unix_tid = reply->unix_tid;
+        }
+    }
+    SERVER_END_REQ;
+
+    if (status != STATUS_SUCCESS || unix_pid == -1 || unix_tid == -1)
+        return;
+
+    current_tid = mach_thread_self();
+    mach_port_deallocate(mach_task_self(), current_tid);
+
+    if (unix_tid != current_tid)
+    {
+        static int once;
+        if (!once++) FIXME("setting other thread name not supported\n");
+        return;
+    }
+
+    len = ntdll_wcstoumbs( name->Buffer, name->Length / sizeof(WCHAR), nameA, sizeof(nameA) - 1, FALSE );
+    nameA[len] = '\0';
+    pthread_setname_np(nameA);
 #else
     static int once;
     if (!once++) FIXME("not implemented on this platform\n");