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annotate util-src/compat.c @ 13966:e7c52d0b0e0d

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util.sql: Add API to start an explicit write transaction This will be used in SQLite3 to BEGIN IMMEDIATE, which attempts to acquire write locks immediately instead of when the first write statement is started. Thus it would fail faster if the write lock is already taken. Normally that should not occur but e.g. prosodyctl could take it. Investigating whether something similar is sensible in PostgreSQL, MySQL is a future task.
author Kim Alvefur <zash@zash.se>
date Mon, 19 Aug 2024 00:06:45 +0200
parents a187600ec7d6
children
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cfc7b2f7251e util.xpcall, util.compat: Add non-hacky multi-argument xpcall() for Lua 5.1
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1
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2 #include <lua.h>
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3 #include <lauxlib.h>
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6 static int lc_xpcall (lua_State *L) {
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7 int ret;
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8 int n_arg = lua_gettop(L);
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9 /* f, msgh, p1, p2... */
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10 luaL_argcheck(L, n_arg >= 2, 2, "value expected");
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11 lua_pushvalue(L, 1); /* f to top */
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12 lua_pushvalue(L, 2); /* msgh to top */
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13 lua_replace(L, 1); /* msgh to 1 */
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14 lua_replace(L, 2); /* f to 2 */
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15 /* msgh, f, p1, p2... */
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16 ret = lua_pcall(L, n_arg - 2, LUA_MULTRET, 1);
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17 lua_pushboolean(L, ret == 0);
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18 lua_replace(L, 1);
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19 return lua_gettop(L);
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20 }
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21
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22 int luaopen_prosody_util_compat(lua_State *L) {
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23 lua_createtable(L, 0, 2);
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24 {
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25 lua_pushcfunction(L, lc_xpcall);
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26 lua_setfield(L, -2, "xpcall");
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27 }
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28 return 1;
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29 }
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30
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31 int luaopen_util_compat(lua_State *L) {
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32 return luaopen_prosody_util_compat(L);
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33 }