Modified Access Matrix of Figure 2 更新的存取矩阵 object laser domain printer/D read read switch switch pri switch control read execute write write switch Applied Operating System Concepts 18 Silberschatz, Galvin, and Gagne @199918.13 Silberschatz, Galvin, and Gagne ©1999 Applied Operating System Concepts Modified Access Matrix of Figure 2 更新的存取矩阵