X-Git-Url: https://git.madduck.net/etc/awesome.git/blobdiff_plain/e5c87b4489b0881b7b9903733478f0d11ac96ab7..a7f02985caf20b40b60fc4d8e0b84b0483ce1865:/luatz/gettime.lua

diff --git a/luatz/gettime.lua b/luatz/gettime.lua
index a86829e..d3eee80 100644
--- 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