#endif /* THREADS && !SRC_M3 */
+/* Register a callback to control the scanning of dynamic libraries.
+ When the GC scans the static data of a dynamic library, it will
+ first call a user-supplied routine with filename of the library and
+ the address and length of the memory region. This routine should
+ return nonzero if that region should be scanned. */
+GC_API void GC_register_has_static_roots_callback
+ (int (*callback)(const char *, void *, size_t));
+
+
#if defined(GC_WIN32_THREADS) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
# include <windows.h>