Edit File: semop-watch.stp
global threads; global times; probe syscall.{semop,semtimedop} { sembuf_sz = @cast_sizeof("struct sembuf"); res = sprintf("set %d sems", semid) %( systemtap_v < "2.3" %? if (tsops_uaddr != 0) sops_uaddr = tsops_uaddr; /* ignore warning for semtimedop's 'tsops_uaddr never-assigned'. */ %) for(i = 0; i < nsops; i++) { offset = i * sembuf_sz; pointer = sops_uaddr + offset; num_addr = & @cast(pointer, "struct sembuf")->sem_num; num = user_short(num_addr); res = sprintf("%s %d", res, num); } res = sprintf("%s\n", res); threads[tid()] = res; times[tid()] = gettimeofday_us(); } probe syscall.{semop,semtimedop}.return { printf("Thread %d took %dus to operate on %s\n", tid(), gettimeofday_us() - times[tid()], threads[tid()]); }