diff options
Diffstat (limited to 'tools.c')
| -rw-r--r-- | tools.c | 37 |
1 files changed, 36 insertions, 1 deletions
@@ -4,7 +4,7 @@ * See the main source file 'vdr.c' for copyright information and * how to reach the author. * - * $Id: tools.c 1.137 2007/11/03 15:34:07 kls Exp $ + * $Id: tools.c 1.138 2007/12/27 15:57:49 kls Exp $ */ #include "tools.h" @@ -545,6 +545,41 @@ cTimeMs::cTimeMs(int Ms) uint64_t cTimeMs::Now(void) { +#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK) +#define MIN_RESOLUTION 5 // ms + static bool initialized = false; + static bool monotonic = false; + struct timespec tp; + if (!initialized) { + // check if monotonic timer is available and provides enough accurate resolution: + if (clock_getres(CLOCK_MONOTONIC, &tp) == 0) { + long Resolution = tp.tv_nsec; + // require a minimum resolution: + if (tp.tv_sec == 0 && tp.tv_nsec <= MIN_RESOLUTION * 1000000) { + if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { + dsyslog("cTimeMs: using monotonic clock (resolution is %ld ns)", Resolution); + monotonic = true; + } + else + esyslog("cTimeMs: clock_gettime(CLOCK_MONOTONIC) failed"); + } + else + dsyslog("cTimeMs: not using monotonic clock - resolution is too bad (%ld s %ld ns)", tp.tv_sec, tp.tv_nsec); + } + else + esyslog("cTimeMs: clock_getres(CLOCK_MONOTONIC) failed"); + initialized = true; + } + if (monotonic) { + if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0) + return (uint64_t(tp.tv_sec)) * 1000 + tp.tv_nsec / 1000000; + esyslog("cTimeMs: clock_gettime(CLOCK_MONOTONIC) failed"); + monotonic = false; + // fall back to gettimeofday() + } +#else +# warning Posix monotonic clock not available +#endif struct timeval t; if (gettimeofday(&t, NULL) == 0) return (uint64_t(t.tv_sec)) * 1000 + t.tv_usec / 1000; |