examples/date_arithmetic.lua: Remove unused c2 var

[etc/awesome.git] / luatz / gettime.lua

diff --git a/luatz/gettime.lua b/luatz/gettime.lua
index a86829e43f7eafee1a8d05dfef3410413c8189b9..d3eee802d205d8266355a09f21e6900cda135d27 100644 (file)
--- a/luatz/gettime.lua
+++ b/luatz/gettime.lua
@@ -1,10 +1,53 @@
 local _M = { }
 
-local has_socket , socket = pcall ( require , "socket" )
-if has_socket then
-       _M.gettime = socket.gettime
-else
-       _M.gettime = os.time
-end
+_M.source , _M.resolution , _M.gettime = (function()
+       local has_syscall , syscall = pcall ( require , "syscall" )
+       if has_syscall and syscall.clock_gettime and syscall.c.CLOCK then
+               local clock_id = syscall.c.CLOCK.REALTIME
+               local function timespec_to_number ( timespec )
+                       return tonumber ( timespec.tv_sec ) + tonumber ( timespec.tv_nsec ) * 1e-9
+               end
+               return "syscall.clock_gettime(CLOCK_REALTIME)" ,
+                       syscall.clock_getres and timespec_to_number ( syscall.clock_getres ( clock_id ) ) or 1e-9 ,
+                       function ( )
+                               return timespec_to_number ( syscall.clock_gettime ( clock_id ) )
+                       end
+       end
+
+       local has_unix , unix = pcall ( require , "unix" )
+       -- On Apple devices lunix only uses gettimeofday()
+       if has_unix and unix.clock_gettime and unix.uname and unix.uname().sysname ~= "Darwin" then
+               return "unix.clock_gettime(CLOCK_REALTIME)" , 1e-9 , function ( )
+                       return unix.clock_gettime ( )
+               end
+       end
+
+       if has_syscall and syscall.gettimeofday then
+               local function timeval_to_number ( timeval )
+                       return tonumber ( timeval.tv_sec ) + tonumber ( timeval.tv_nsec ) * 1e-6
+               end
+               return "syscall.gettimeofday()" , 1e-6 ,
+                       function ( )
+                               return timeval_to_number ( syscall.gettimeofday ( ) )
+                       end
+       end
+
+       if has_unix and unix.gettimeofday then
+               return "unix.gettimeofday()", 1e-6, unix.gettimeofday
+       end
+
+       local has_socket , socket = pcall ( require , "socket" )
+       if has_socket and socket.gettime then
+               -- on windows, this uses GetSystemTimeAsFileTime, which has resolution of 1e-7
+               -- on linux, this uses gettimeofday, which has resolution of 1e-6
+               return "socket.gettime()" , 1e-6 , socket.gettime
+       end
+
+       if ngx and ngx.now then -- luacheck: ignore 113
+               return "ngx.now()" , 1e-3 , ngx.now -- luacheck: ignore 113
+       end
+
+       return "os.time()" , 1 , os.time
+end)()
 
 return _M