prosody
f0b2c026e542
util-src/time.c

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util-src/time.c @ 13552:f0b2c026e542

net.server_epoll: Improve efficiency of sending much buffered data Problem: The string slice operations when a lot of data gets buffered ends up being expensive and memory-consuming. We have util.dbuffer for precisely this kind of thing. I want to keep the behavior of writebuffer being upgraded from nil to a string to full buffer since the last step involves three table allocations, where the previous buffer method only used one. Avoiding those allocations for simple writes like white space keep alive feels like it would keep memory churn down. This work was started in 2020
author Kim Alvefur <zash@zash.se>
date Sat, 09 Nov 2024 00:37:15 +0100
parent 12976:a187600ec7d6
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1 #ifndef _POSIX_C_SOURCE
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2 #define _POSIX_C_SOURCE 200809L
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3 #endif
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4
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5 #include <time.h>
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6 #include <lua.h>
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7
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8 static lua_Number tv2number(struct timespec *tv) {
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9 return tv->tv_sec + tv->tv_nsec * 1e-9;
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10 }
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11
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12 static int lc_time_realtime(lua_State *L) {
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13 struct timespec t;
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14 clock_gettime(CLOCK_REALTIME, &t);
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15 lua_pushnumber(L, tv2number(&t));
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16 return 1;
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17 }
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18
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19 static int lc_time_monotonic(lua_State *L) {
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20 struct timespec t;
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21 clock_gettime(CLOCK_MONOTONIC, &t);
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22 lua_pushnumber(L, tv2number(&t));
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23 return 1;
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24 }
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25
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26 int luaopen_prosody_util_time(lua_State *L) {
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27 lua_createtable(L, 0, 2);
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28 {
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29 lua_pushcfunction(L, lc_time_realtime);
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30 lua_setfield(L, -2, "now");
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31 lua_pushcfunction(L, lc_time_monotonic);
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32 lua_setfield(L, -2, "monotonic");
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33 }
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34 return 1;
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35 }
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36 int luaopen_util_time(lua_State *L) {
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37 return luaopen_prosody_util_time(L);
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38 }