From b6ee3d4ada4e85d9b9b9164c1327ef0850c79d5e Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Sat, 27 Aug 2005 18:18:18 -0300 Subject: [CCID3]: Reorganise timeval handling Introducing functions to add to or subtract from a timeval variable and renaming now_delta to timeval_new_delta that calls do_gettimeofday and then timeval_delta, that should be used when there are several deltas made relative to the current time or setting variables to it, so as to avoid calling do_gettimeofday excessively. I'm leaving these "timeval_" prefixed funcions internal to DCCP for a while till we're sure there are no subtle bugs in it. It also is more correct as it checks if the number of usecs added to or subtracted from a tv_usec field is more than 2 seconds. Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: David S. Miller --- net/dccp/dccp.h | 44 ++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 40 insertions(+), 4 deletions(-) (limited to 'net/dccp/dccp.h') diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h index 6ba21509e797..5cd9e794bbe2 100644 --- a/net/dccp/dccp.h +++ b/net/dccp/dccp.h @@ -429,17 +429,53 @@ extern int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state); extern void dccp_ackpkts_check_rcv_ackno(struct dccp_ackpkts *ap, struct sock *sk, u64 ackno); +static inline suseconds_t timeval_usecs(const struct timeval *tv) +{ + return tv->tv_sec * USEC_PER_SEC + tv->tv_usec; +} + +static inline suseconds_t timeval_delta(const struct timeval *large, + const struct timeval *small) +{ + time_t secs = large->tv_sec - small->tv_sec; + suseconds_t usecs = large->tv_usec - small->tv_usec; + + if (usecs < 0) { + secs--; + usecs += USEC_PER_SEC; + } + return secs * USEC_PER_SEC + usecs; +} + +static inline void timeval_add_usecs(struct timeval *tv, + const suseconds_t usecs) +{ + tv->tv_usec += usecs; + while (tv->tv_usec >= USEC_PER_SEC) { + tv->tv_sec++; + tv->tv_usec -= USEC_PER_SEC; + } +} + +static inline void timeval_sub_usecs(struct timeval *tv, + const suseconds_t usecs) +{ + tv->tv_usec -= usecs; + while (tv->tv_usec < 0) { + tv->tv_sec--; + tv->tv_usec += USEC_PER_SEC; + } +} + /* * Returns the difference in usecs between timeval * passed in and current time */ -static inline u32 now_delta(struct timeval tv) +static inline suseconds_t timeval_now_delta(const struct timeval *tv) { struct timeval now; - do_gettimeofday(&now); - return (now.tv_sec - tv.tv_sec) * USEC_PER_SEC + - (now.tv_usec - tv.tv_usec); + return timeval_delta(&now, tv); } #ifdef CONFIG_IP_DCCP_DEBUG -- cgit v1.2.2