X-Git-Url: https://git.madduck.net/etc/awesome.git/blobdiff_plain/e5c87b4489b0881b7b9903733478f0d11ac96ab7..ea80d24490413633ad3fb37a7369086692209804:/luatz/gettime.lua

diff --git a/luatz/gettime.lua b/luatz/gettime.lua
index a86829e..e0da6b4 100644
--- a/luatz/gettime.lua
+++ b/luatz/gettime.lua
@@ -1,10 +1,42 @@
 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 then
+		if syscall.clock_gettime 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
+
+		elseif 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
+	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