From 726ba36201226fe1b0e768b27cb67bce45443df5 Mon Sep 17 00:00:00 2001 From: Pau Espin Pedrol Date: Mon, 26 Feb 2018 18:03:44 +0100 Subject: core: Add timespec helper macros and make timer_compat.h public If a monotonic clock must be used, then the clock_gettime API is used which uses timespec structures. Linux systems by default don't provide helpers to calculate time using timespecs, so let's add them here. Let's also make this header public so these helpers can be used in other projects using libosmocore (expected user: libosmo-netif). Change-Id: I45fc993b9bb0a343763238bf463c8640f47b00f1 --- include/osmocom/core/timer_compat.h | 44 +++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) (limited to 'include/osmocom/core/timer_compat.h') diff --git a/include/osmocom/core/timer_compat.h b/include/osmocom/core/timer_compat.h index 77d4ce0a..8fdd0a08 100644 --- a/include/osmocom/core/timer_compat.h +++ b/include/osmocom/core/timer_compat.h @@ -71,5 +71,49 @@ } while (0) #endif +/* Convenience macros for operations on timespecs. + NOTE: `timercmp' does not work for >= or <=. */ + +#ifndef timespecisset +# define timespecisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec) +#endif + +#ifndef timespecclear +# define timespecclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0) +#endif + +#ifndef timespeccmp +# define timespeccmp(a, b, CMP) \ + (((a)->tv_sec == (b)->tv_sec) ? \ + ((a)->tv_nsec CMP (b)->tv_nsec) : \ + ((a)->tv_sec CMP (b)->tv_sec)) +#endif + +#ifndef timespecadd +# define timespecadd(a, b, result) \ + do { \ + (result)->tv_sec = (a)->tv_sec + (b)->tv_sec; \ + (result)->tv_nsec = (a)->tv_nsec + (b)->tv_nsec; \ + if ((result)->tv_nsec >= 1000000000) \ + { \ + ++(result)->tv_sec; \ + (result)->tv_nsec -= 1000000000; \ + } \ + } while (0) +#endif + +#ifndef timespecsub +# define timespecsub(a, b, result) \ + do { \ + (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \ + (result)->tv_nsec = (a)->tv_nsec - (b)->tv_nsec; \ + if ((result)->tv_nsec < 0) { \ + --(result)->tv_sec; \ + (result)->tv_nsec += 1000000000; \ + } \ + } while (0) +#endif + + /*! @} */ -- cgit v1.2.3