Tries to lock lock for writing. If lock is already locked (for
either reading or writing) by another thread, it immediately returns
FALSE. Otherwise it locks lock for writing and returns TRUE. This
lock has to be unlocked by g_static_rw_lock_writer_unlock().
Tries to lock lock for writing. If lock is already locked (for either reading or writing) by another thread, it immediately returns FALSE. Otherwise it locks lock for writing and returns TRUE. This lock has to be unlocked by g_static_rw_lock_writer_unlock().