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Diffstat (limited to '')
| -rw-r--r-- | libnetdata/clocks/clocks.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/libnetdata/clocks/clocks.c b/libnetdata/clocks/clocks.c new file mode 100644 index 0000000..f303ccd --- /dev/null +++ b/libnetdata/clocks/clocks.c @@ -0,0 +1,204 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "../libnetdata.h" + +#ifndef HAVE_CLOCK_GETTIME +inline int clock_gettime(clockid_t clk_id, struct timespec *ts) { + struct timeval tv; + if(unlikely(gettimeofday(&tv, NULL) == -1)) { + error("gettimeofday() failed."); + return -1; + } + ts->tv_sec = tv.tv_sec; + ts->tv_nsec = (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC; + return 0; +} +#endif + +static inline time_t now_sec(clockid_t clk_id) { + struct timespec ts; + if(unlikely(clock_gettime(clk_id, &ts) == -1)) { + error("clock_gettime(%d, ×pec) failed.", clk_id); + return 0; + } + return ts.tv_sec; +} + +static inline usec_t now_usec(clockid_t clk_id) { + struct timespec ts; + if(unlikely(clock_gettime(clk_id, &ts) == -1)) { + error("clock_gettime(%d, ×pec) failed.", clk_id); + return 0; + } + return (usec_t)ts.tv_sec * USEC_PER_SEC + (ts.tv_nsec % NSEC_PER_SEC) / NSEC_PER_USEC; +} + +static inline int now_timeval(clockid_t clk_id, struct timeval *tv) { + struct timespec ts; + + if(unlikely(clock_gettime(clk_id, &ts) == -1)) { + error("clock_gettime(%d, ×pec) failed.", clk_id); + tv->tv_sec = 0; + tv->tv_usec = 0; + return -1; + } + + tv->tv_sec = ts.tv_sec; + tv->tv_usec = (suseconds_t)((ts.tv_nsec % NSEC_PER_SEC) / NSEC_PER_USEC); + return 0; +} + +inline time_t now_realtime_sec(void) { + return now_sec(CLOCK_REALTIME); +} + +inline usec_t now_realtime_usec(void) { + return now_usec(CLOCK_REALTIME); +} + +inline int now_realtime_timeval(struct timeval *tv) { + return now_timeval(CLOCK_REALTIME, tv); +} + +inline time_t now_monotonic_sec(void) { + return now_sec(CLOCK_MONOTONIC); +} + +inline usec_t now_monotonic_usec(void) { + return now_usec(CLOCK_MONOTONIC); +} + +inline int now_monotonic_timeval(struct timeval *tv) { + return now_timeval(CLOCK_MONOTONIC, tv); +} + +inline time_t now_boottime_sec(void) { + return now_sec(CLOCK_BOOTTIME); +} + +inline usec_t now_boottime_usec(void) { + return now_usec(CLOCK_BOOTTIME); +} + +inline int now_boottime_timeval(struct timeval *tv) { + return now_timeval(CLOCK_BOOTTIME, tv); +} + +inline usec_t timeval_usec(struct timeval *tv) { + return (usec_t)tv->tv_sec * USEC_PER_SEC + (tv->tv_usec % USEC_PER_SEC); +} + +inline msec_t timeval_msec(struct timeval *tv) { + return (msec_t)tv->tv_sec * MSEC_PER_SEC + ((tv->tv_usec % USEC_PER_SEC) / MSEC_PER_SEC); +} + +inline susec_t dt_usec_signed(struct timeval *now, struct timeval *old) { + usec_t ts1 = timeval_usec(now); + usec_t ts2 = timeval_usec(old); + + if(likely(ts1 >= ts2)) return (susec_t)(ts1 - ts2); + return -((susec_t)(ts2 - ts1)); +} + +inline usec_t dt_usec(struct timeval *now, struct timeval *old) { + usec_t ts1 = timeval_usec(now); + usec_t ts2 = timeval_usec(old); + return (ts1 > ts2) ? (ts1 - ts2) : (ts2 - ts1); +} + +inline void heartbeat_init(heartbeat_t *hb) +{ + hb->monotonic = hb->realtime = 0ULL; +} + +// waits for the next heartbeat +// it waits using the monotonic clock +// it returns the dt using the realtime clock + +usec_t heartbeat_next(heartbeat_t *hb, usec_t tick) { + heartbeat_t now; + now.monotonic = now_monotonic_usec(); + now.realtime = now_realtime_usec(); + + usec_t next_monotonic = now.monotonic - (now.monotonic % tick) + tick; + + while(now.monotonic < next_monotonic) { + sleep_usec(next_monotonic - now.monotonic); + now.monotonic = now_monotonic_usec(); + now.realtime = now_realtime_usec(); + } + + if(likely(hb->realtime != 0ULL)) { + usec_t dt_monotonic = now.monotonic - hb->monotonic; + usec_t dt_realtime = now.realtime - hb->realtime; + + hb->monotonic = now.monotonic; + hb->realtime = now.realtime; + + if(unlikely(dt_monotonic >= tick + tick / 2)) { + errno = 0; + error("heartbeat missed %llu monotonic microseconds", dt_monotonic - tick); + } + + return dt_realtime; + } + else { + hb->monotonic = now.monotonic; + hb->realtime = now.realtime; + return 0ULL; + } +} + +// returned the elapsed time, since the last heartbeat +// using the monotonic clock + +inline usec_t heartbeat_monotonic_dt_to_now_usec(heartbeat_t *hb) { + if(!hb || !hb->monotonic) return 0ULL; + return now_monotonic_usec() - hb->monotonic; +} + +int sleep_usec(usec_t usec) { + +#ifndef NETDATA_WITH_USLEEP + // we expect microseconds (1.000.000 per second) + // but timespec is nanoseconds (1.000.000.000 per second) + struct timespec rem, req = { + .tv_sec = (time_t) (usec / 1000000), + .tv_nsec = (suseconds_t) ((usec % 1000000) * 1000) + }; + + while (nanosleep(&req, &rem) == -1) { + if (likely(errno == EINTR)) { + debug(D_SYSTEM, "nanosleep() interrupted (while sleeping for %llu microseconds).", usec); + req.tv_sec = rem.tv_sec; + req.tv_nsec = rem.tv_nsec; + } else { + error("Cannot nanosleep() for %llu microseconds.", usec); + break; + } + } + + return 0; +#else + int ret = usleep(usec); + if(unlikely(ret == -1 && errno == EINVAL)) { + // on certain systems, usec has to be up to 999999 + if(usec > 999999) { + int counter = usec / 999999; + while(counter--) + usleep(999999); + + usleep(usec % 999999); + } + else { + error("Cannot usleep() for %llu microseconds.", usec); + return ret; + } + } + + if(ret != 0) + error("usleep() failed for %llu microseconds.", usec); + + return ret; +#endif +} |