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Subject: cec-ctl: get the monotonic start time and wallclock time only once Author: Hans Verkuil <[email protected]> Date: Tue Aug 1 14:46:56 2017 +0200 Don't call these every time ts2s() is called, just do it once at start up. Signed-off-by: Hans Verkuil <[email protected]> utils/cec-ctl/cec-ctl.cpp | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) --- http://git.linuxtv.org/cgit.cgi/v4l-utils.git/commit/?id=cd573ec9f41bbeb6c2e78bfa55187f1d418d8be4 diff --git a/utils/cec-ctl/cec-ctl.cpp b/utils/cec-ctl/cec-ctl.cpp index 50400d689155..21c98f65e665 100644 --- a/utils/cec-ctl/cec-ctl.cpp +++ b/utils/cec-ctl/cec-ctl.cpp @@ -48,6 +48,9 @@ #define xstr(s) str(s) #define str(s) #s +static struct timespec start_monotonic; +static struct timeval start_timeofday; + struct cec_enum_values { const char *type_name; __u8 value; @@ -1131,8 +1134,6 @@ static const char *vendor2s(unsigned vendor) std::string ts2s(__u64 ts) { std::string s; - struct timespec now; - struct timeval tv; struct timeval sub; struct timeval res; __u64 diff; @@ -1143,12 +1144,10 @@ std::string ts2s(__u64 ts) sprintf(buf, "%llu.%03llus", ts / 1000000000, (ts % 1000000000) / 1000000); return buf; } - clock_gettime(CLOCK_MONOTONIC, &now); - gettimeofday(&tv, NULL); - diff = now.tv_sec * 1000000000ULL + now.tv_nsec - ts; + diff = ts - start_monotonic.tv_sec * 1000000000ULL - start_monotonic.tv_nsec; sub.tv_sec = diff / 1000000000ULL; sub.tv_usec = (diff % 1000000000ULL) / 1000; - timersub(&tv, &sub, &res); + timeradd(&start_timeofday, &sub, &res); t = res.tv_sec; s = ctime(&t); s = s.substr(0, s.length() - 6); @@ -1958,6 +1957,9 @@ int main(int argc, char **argv) return 1; } + clock_gettime(CLOCK_MONOTONIC, &start_monotonic); + gettimeofday(&start_timeofday, NULL); + if ((fd = open(device, O_RDWR)) < 0) { fprintf(stderr, "Failed to open %s: %s\n", device, strerror(errno)); _______________________________________________ linuxtv-commits mailing list [email protected] https://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
