Software / code / prosody
Annotate
util-src/time.c @ 11661:735b8f4a6d7e
net.http: Send entire HTTP request header as one write
When opportunistic writes are enabled this reduces the number of
syscalls and TCP packets sent on the wire.
Experiments with TCP Fast Open made this even more obvious.
That table trick probably wasn't as efficient. Lua generates bytecode
for a table with zero array slots and space for two entries in the hash
part, plus code to set [2] and [4]. I didn't verify but I suspect it
would have had to resize the table when setting [1] and [3], although
probably only once. Concatenating the strings directly in Lua is easier
to read and involves no extra table or function call.
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Thu, 08 Jul 2021 18:21:59 +0200 |
| parent | 10480:94cacf9fd0ae |
| child | 12976:a187600ec7d6 |
| rev | line source |
|---|---|
|
9164
35807f02bdc7
util.time: Allow for already set constant
Kim Alvefur <zash@zash.se>
parents:
9163
diff
changeset
|
1 #ifndef _POSIX_C_SOURCE |
|
9680
a374905e99ff
util.time: Bump POSIX_C_SOURCE to ensure visibility of CLOCK_MONOTONIC on FreeBSD (fixes #1253)
Matthew Wild <mwild1@gmail.com>
parents:
9164
diff
changeset
|
2 #define _POSIX_C_SOURCE 200809L |
|
9164
35807f02bdc7
util.time: Allow for already set constant
Kim Alvefur <zash@zash.se>
parents:
9163
diff
changeset
|
3 #endif |
| 9162 | 4 |
| 5 #include <time.h> | |
| 6 #include <lua.h> | |
| 7 | |
|
10480
94cacf9fd0ae
util.*.c: Add static qualifiers everywhere
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
9680
diff
changeset
|
8 static lua_Number tv2number(struct timespec *tv) { |
| 9162 | 9 return tv->tv_sec + tv->tv_nsec * 1e-9; |
| 10 } | |
| 11 | |
|
10480
94cacf9fd0ae
util.*.c: Add static qualifiers everywhere
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
9680
diff
changeset
|
12 static int lc_time_realtime(lua_State *L) { |
| 9162 | 13 struct timespec t; |
| 14 clock_gettime(CLOCK_REALTIME, &t); | |
| 15 lua_pushnumber(L, tv2number(&t)); | |
| 16 return 1; | |
| 17 } | |
| 18 | |
|
10480
94cacf9fd0ae
util.*.c: Add static qualifiers everywhere
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
9680
diff
changeset
|
19 static int lc_time_monotonic(lua_State *L) { |
| 9163 | 20 struct timespec t; |
| 21 clock_gettime(CLOCK_MONOTONIC, &t); | |
| 22 lua_pushnumber(L, tv2number(&t)); | |
| 23 return 1; | |
| 24 } | |
| 25 | |
| 9162 | 26 int luaopen_util_time(lua_State *L) { |
| 27 lua_createtable(L, 0, 2); | |
| 28 { | |
| 29 lua_pushcfunction(L, lc_time_realtime); | |
| 30 lua_setfield(L, -2, "now"); | |
| 9163 | 31 lua_pushcfunction(L, lc_time_monotonic); |
| 32 lua_setfield(L, -2, "monotonic"); | |
| 9162 | 33 } |
| 34 return 1; | |
| 35 } |
