doc/index.md: Fix internal link

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

diff --git a/luatz/gettime.lua b/luatz/gettime.lua
index a86829e43f7eafee1a8d05dfef3410413c8189b9..4d6f45ad2c95a9a7494f0cb8c2f01fe30706701c 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
+local _M = {}
+
+_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
 
 return _M