thread can not ptrace other thread in the same process
1.create and build a project: /WindRiver-4.3/wrlinux-4/wrlinux/../ldat/configure --enable-board=common_pc_64 --enable-rootfs=glibc_std --enable-kernel=standard --with-product-dir=/WindRiver-4.3/wrlinux-4/wrlinux 2. boot wrlinux 3.add a user in wrlinux and get its UID 4.modify parameter of 'setuid' to UID of user added before in 'test.c' attached. 5.compiile 'test.c' 6.run test in wrlinux, it will print 'thread 667's pc = 0x00000000', it means a thread can not get pc of other thread.
