mirror/zig
1
0
Fork 0
mirror of https://github.com/ziglang/zig.git synced 2026-02-12 20:37:54 +00:00
Code Issues Packages Projects Releases Wiki Activity

Use once to init _timestart in thread safe way

Browse Source
This commit is contained in:
LeRoyce Pearson 2020-04-30 23:16:54 -06:00 committed by Andrew Kelley
parent 7586ce0023
commit 2dfe798217
1 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
lib/std/time.zig
View File

@ -67,9 +67,10 @@ const DarwinTimeStart = struct {
initclock: u64,
};
var _timestart: ?DarwinTimeStart = null;
var _timestart: DarwinTimeStart = undefined;
var _init_timestart_once = std.once(_init_timestart);
pub fn _init_time_for_darwin() DarwinTimeStart {
pub fn _init_timestart() void {
var micro: os.darwin.timeval = undefined;
var timestart: DarwinTimeStart = undefined;
@ -84,7 +85,6 @@ pub fn _init_time_for_darwin() DarwinTimeStart {
timestart.inittime.tv_nsec = micro.tv_usec * 1000;
_timestart = timestart;
return timestart;
}
/// Get the posix timestamp, UTC, in nanoseconds
@ -115,14 +115,14 @@ pub fn nanoTimestamp() u64 {
}
if (comptime std.Target.current.isDarwin()) {
// https://stackoverflow.com/a/21352348
const timestart = if (_timestart) |timestart| timestart else _init_time_for_darwin();
const clock: u64 = os.darwin.mach_absolute_time() - timestart.initclock;
const nano = clock * @divFloor(@as(u64, timestart.timebase.number), @as(u64, timestart.timebase.denom));
_init_timestart_once.call();
var future = timestart.inittime;
const tv_sec_nsec = @intCast(u64, timestart.inittime.tv_sec) * ns_per_s;
const tv_nsec = @intCast(u64, timestart.inittime.tv_nsec);
const clock: u64 = os.darwin.mach_absolute_time() - _timestart.initclock;
const nano = clock * @divFloor(@as(u64, _timestart.timebase.number), @as(u64, _timestart.timebase.denom));
const tv_sec_nsec = @intCast(u64, _timestart.inittime.tv_sec) * ns_per_s;
const tv_nsec = @intCast(u64, _timestart.inittime.tv_nsec);
return tv_sec_nsec + tv_nsec + nano;
}