#define rd_wr_wr_off1       (write_off - read_off >= 0)
#define rd_wr_wr_off2       (write_off - read_off < HALF_UCHAR)

#define commit_sum_wr_off1	(write_off - commit_sum >= 0)
#define commit_sum_wr_off2	(write_off - commit_sum < HALF_UCHAR)

#define buffer_large_enough	(NUMPROCS + NUMSWITCH <= BUFSIZE)
#define have_events_lost	(events_lost != 0)