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e0da6b4c0f4a95ca647304fc9bb2598653b5859e
[etc/awesome.git] / luatz / gettime.lua
1 local _M = { }
2
3 _M.source , _M.resolution , _M.gettime = (function()
4         local has_syscall , syscall = pcall ( require , "syscall" )
5         if has_syscall then
6                 if syscall.clock_gettime then
7                         local clock_id = syscall.c.CLOCK.REALTIME
8                         local function timespec_to_number ( timespec )
9                                 return tonumber ( timespec.tv_sec ) + tonumber ( timespec.tv_nsec ) * 1e-9
10                         end
11                         return "syscall.clock_gettime(CLOCK_REALTIME)" ,
12                                 syscall.clock_getres and timespec_to_number ( syscall.clock_getres ( clock_id ) ) or 1e-9 ,
13                                 function ( )
14                                         return timespec_to_number ( syscall.clock_gettime ( clock_id ) )
15                                 end
16
17                 elseif syscall.gettimeofday then
18                         local function timeval_to_number ( timeval )
19                                 return tonumber ( timeval.tv_sec ) + tonumber ( timeval.tv_nsec ) * 1e-6
20                         end
21                         return "syscall.gettimeofday()" , 1e-6 ,
22                                 function ( )
23                                         return timeval_to_number ( syscall.gettimeofday ( ) )
24                                 end
25                 end
26         end
27
28         local has_socket , socket = pcall ( require , "socket" )
29         if has_socket and socket.gettime then
30                 -- on windows, this uses GetSystemTimeAsFileTime, which has resolution of 1e-7
31                 -- on linux, this uses gettimeofday, which has resolution of 1e-6
32                 return "socket.gettime()" , 1e-6 , socket.gettime
33         end
34
35         if ngx and ngx.now then -- luacheck: ignore 113
36                 return "ngx.now()" , 1e-3 , ngx.now -- luacheck: ignore 113
37         end
38
39         return "os.time()" , 1 , os.time
40 end)()
41
42 return _M