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Add std.time.nanoTimestamp function

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This commit is contained in:
LeRoyce Pearson 2020-04-30 20:44:22 -06:00 committed by Andrew Kelley
parent 4b1a846471
commit bb46894115
1 changed files with 19 additions and 13 deletions
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32
lib/std/time.zig
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@ -58,16 +58,25 @@ pub fn timestamp() u64 {
/// Get the posix timestamp, UTC, in milliseconds
/// TODO audit this function. is it possible to return an error?
pub fn milliTimestamp() u64 {
return @divFloor(nanoTimestamp(), millisecond);
}
/// Get the posix timestamp, UTC, in nanoseconds
///
/// On windows this only has a granularity of 100 nanoseconds.
///
/// TODO audit this function. is it possible to return an error?
pub fn nanoTimestamp() u64 {
if (is_windows) {
//FileTime has a granularity of 100 nanoseconds
// and uses the NTFS/Windows epoch
var ft: os.windows.FILETIME = undefined;
os.windows.kernel32.GetSystemTimeAsFileTime(&ft);
const hns_per_ms = (ns_per_s / 100) / ms_per_s;
const epoch_adj = epoch.windows * ms_per_s;
const ns_per_hns = 100;
const epoch_adj = epoch.windows * ns_per_s;
const ft64 = (@as(u64, ft.dwHighDateTime) << 32) | ft.dwLowDateTime;
return @divFloor(ft64, hns_per_ms) - -epoch_adj;
return (ft64 * hns_per_ms) - -epoch_adj;
}
if (builtin.os.tag == .wasi and !builtin.link_libc) {
var ns: os.wasi.timestamp_t = undefined;
@ -76,25 +85,22 @@ pub fn milliTimestamp() u64 {
const err = os.wasi.clock_time_get(os.wasi.CLOCK_REALTIME, 1, &ns);
assert(err == os.wasi.ESUCCESS);
const ns_per_ms = 1000;
return @divFloor(ns, ns_per_ms);
return ns;
}
if (comptime std.Target.current.isDarwin()) {
var tv: os.darwin.timeval = undefined;
var err = os.darwin.gettimeofday(&tv, null);
var mts: os.darwin.mach_timespec_t = undefined;
var err = os.darwin.clock_get_time(os.darwin.CALENDAR_CLOCK, &mts);
assert(err == 0);
const sec_ms = tv.tv_sec * ms_per_s;
const usec_ms = @divFloor(tv.tv_usec, us_per_s / ms_per_s);
return @intCast(u64, sec_ms + usec_ms);
const sec_ns = @as(u64, mts.tv_sec * ns_per_s);
return sec_ns + @intCast(u64, mts.tv_nsec);
}
var ts: os.timespec = undefined;
//From what I can tell there's no reason clock_gettime
// should ever fail for us with CLOCK_REALTIME,
// seccomp aside.
os.clock_gettime(os.CLOCK_REALTIME, &ts) catch unreachable;
const sec_ms = @intCast(u64, ts.tv_sec) * ms_per_s;
const nsec_ms = @divFloor(@intCast(u64, ts.tv_nsec), ns_per_s / ms_per_s);
return sec_ms + nsec_ms;
const sec_ns = @intCast(u64, ts.tv_sec) * ns_per_s;
return sec_ns + @intCast(u64, ts.tv_nsec);
}
/// Multiples of a base unit (nanoseconds)