diff options
Diffstat (limited to 'builtin/common')
| -rw-r--r-- | builtin/common/after.lua | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/builtin/common/after.lua b/builtin/common/after.lua new file mode 100644 index 000000000..30a9c7bad --- /dev/null +++ b/builtin/common/after.lua @@ -0,0 +1,43 @@ +local jobs = {} +local time = 0.0 +local last = core.get_us_time() / 1000000 + +core.register_globalstep(function(dtime) + local new = core.get_us_time() / 1000000 + if new > last then + time = time + (new - last) + else + -- Overflow, we may lose a little bit of time here but + -- only 1 tick max, potentially running timers slightly + -- too early. + time = time + new + end + last = new + + if #jobs < 1 then + return + end + + -- Iterate backwards so that we miss any new timers added by + -- a timer callback, and so that we don't skip the next timer + -- in the list if we remove one. + for i = #jobs, 1, -1 do + local job = jobs[i] + if time >= job.expire then + core.set_last_run_mod(job.mod_origin) + job.func(unpack(job.arg)) + table.remove(jobs, i) + end + end +end) + +function core.after(after, func, ...) + assert(tonumber(after) and type(func) == "function", + "Invalid core.after invocation") + jobs[#jobs + 1] = { + func = func, + expire = time + after, + arg = {...}, + mod_origin = core.get_last_run_mod() + } +end |