mirror of
https://github.com/lunarmodules/luasocket.git
synced 2024-06-29 09:59:48 +02:00
select implementation.
This commit is contained in:
Diego Nehab
parent
b04b81ddd9
commit
9b8bce6465
248
src/select.c
248
src/select.c
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@ -1,39 +1,43 @@
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#include <lua.h>
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#include "lspriv.h"
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#include "lsselect.h"
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#include "lsfd.h"
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/* auxiliar functions */
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static int local_select(lua_State *L);
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static int local_getfd(lua_State *L);
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static int local_pending(lua_State *L);
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static int local_FD_SET(lua_State *L);
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static int local_FD_ISSET(lua_State *L);
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static int select_lua_select(lua_State *L);
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/*-------------------------------------------------------------------------*\
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* Marks type as selectable
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* Input
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* name: type name
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\*-------------------------------------------------------------------------*/
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void slct_addclass(lua_State *L, cchar *lsclass)
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void select_addclass(lua_State *L, cchar *lsclass)
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{
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lua_pushstring(L, "selectable sockets");
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lua_pushstring(L, "luasocket(select)");
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lua_gettable(L, LUA_REGISTRYINDEX);
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lua_pushstring(L, lsclass);
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lua_pushnumber(L, 1);
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lua_settable(L, -3);
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lua_pop(L, 2);
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lua_pop(L, 1);
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}
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/*-------------------------------------------------------------------------*\
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* Gets a pointer to a socket structure from a userdata
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* Input
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* pos: userdata stack index
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* Returns
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* pointer to structure, or NULL if invalid type
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\*-------------------------------------------------------------------------*/
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static p_sock ls_toselectable(lua_State *L)
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void select_open(lua_State *L)
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{
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lua_getregistry(L);
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lua_pushstring(L, "sock(selectable)");
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lua_gettable(L, -2);
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lua_pushstring(L, lua_type(L, -3));
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lua_gettable(L, -2);
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if (lua_isnil(L, -1)) {
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lua_pop(L, 3);
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return NULL;
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} else {
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lua_pop(L, 3);
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return (p_sock) lua_touserdata(L, -1);
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}
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/* push select auxiliar lua function and register
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* select_lua_select with it as an upvalue */
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#include "lsselect.loh"
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lua_pushcclosure(L, select_lua_select, 1);
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lua_setglobal(L, "select");
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/* create luasocket(select) table */
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lua_pushstring(L, "luasocket(select)");
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lua_newtable(L);
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lua_settable(L, LUA_REGISTRYINDEX);
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}
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/*-------------------------------------------------------------------------*\
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@ -47,148 +51,86 @@ static p_sock ls_toselectable(lua_State *L)
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* {output}: table with sockets ready for output
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* err: "timeout" or nil
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\*-------------------------------------------------------------------------*/
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int global_select(lua_State *L)
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static int select_lua_select(lua_State *L)
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{
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int ms = lua_isnil(L, 3) ? -1 : (int) (luaL_opt_number(L, 3, -1) * 1000);
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fd_set rfds, *prfds = NULL, wfds, *pwfds = NULL;
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struct timeval tv, *ptv = NULL;
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unsigned max = 0;
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int byfds, readable, writable;
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int toread = 1, towrite = 2;
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lua_newtable(L); byfds = lua_gettop(L); /* sockets indexed by descriptor */
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lua_newtable(L); readable = lua_gettop(L);
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lua_newtable(L); writable = lua_gettop(L);
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/* collect sockets to be tested into FD_SET structures and fill byfds */
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if (lua_istable(L, toread))
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prfds = tab2rfds(L, toread, &rfds, &max, byfds, readable, &ms);
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else if (!lua_isnil(L, toread))
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luaL_argerror(L, toread, "expected table or nil");
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if (lua_istable(L, towrite))
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pwfds = tab2wfds(L, towrite, &wfds, &max, byfds);
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else if (!lua_isnil(L, towrite))
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luaL_argerror(L, towrite, "expected table or nil");
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/* fill timeval structure */
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if (ms >= 0) {
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tv.tv_sec = ms / 1000;
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tv.tv_usec = (ms % 1000) * 1000;
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ptv = &tv;
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} else ptv = NULL; /* ptv == NULL when we don't have timeout */
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/* see if we can read, write or if we timedout */
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if (select(max+1, prfds, pwfds, NULL, ptv) <= 0 && ms >= 0) {
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ls_pusherror(L, LS_TIMEOUT);
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return 3;
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}
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/* collect readable and writable sockets into result tables */
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fds2tab(L, prfds, max+1, byfds, readable);
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fds2tab(L, pwfds, max+1, byfds, writable);
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lua_pushnil(L);
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fd_set read, write;
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FD_ZERO(&read);
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FD_ZERO(&write);
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/* push select lua auxiliar function */
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lua_pushvalue(L, lua_upvalueindex(1)); lua_insert(L, 1);
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/* make sure we have enough arguments (nil is the default) */
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lua_settop(L, 4);
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/* pass FD_SET and manipulation functions */
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lua_newuserdatabox(L, &read);
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lua_newuserdatabox(L, &write);
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lua_pushcfunction(L, local_FD_SET);
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lua_pushcfunction(L, local_FD_ISSET);
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/* pass getfd function with selectable table as upvalue */
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lua_pushstring(L, "luasocket(select)"); lua_gettable(L, LUA_REGISTRYINDEX);
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lua_pushcclosure(L, local_getfd, 1);
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/* pass pending function */
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lua_pushstring(L, "luasocket(select)"); lua_gettable(L, LUA_REGISTRYINDEX);
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lua_pushcclosure(L, local_pending, 1);
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/* pass select auxiliar C function */
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lua_pushcfunction(L, local_select);
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/* call select auxiliar lua function */
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lua_call(L, 10, 3);
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return 3;
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}
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/*=========================================================================*\
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* Select auxiliar functions
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\*=========================================================================*/
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/*-------------------------------------------------------------------------*\
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* Converts a FD_SET structure into a socket table set
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* Input
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* fds: pointer to FD_SET structure
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* max: 1 plus the largest descriptor value in FD_SET
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* byfds: table indexed by descriptor number, with corresponding socket tables
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* can: table to receive corresponding socket table set
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\*-------------------------------------------------------------------------*/
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static void fds2tab(lua_State *L, fd_set *fds, int max, int byfds, int can)
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static int local_getfd(lua_State *L)
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{
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int s;
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if (!fds) return;
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for (s = 0; s < max; s++) {
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if (FD_ISSET(s, fds)) {
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lua_pushnumber(L, lua_getn(L, can) + 1);
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lua_pushnumber(L, s);
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lua_gettable(L, byfds);
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lua_settable(L, can);
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}
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priv_pushclass(L, 1);
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lua_gettable(L, lua_upvalueindex(1));
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if (!lua_isnil(L, -1)) {
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p_fd sock = (p_fd) lua_touserdata(L, 1);
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lua_pushnumber(L, sock->fd);
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}
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return 1;
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}
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/*-------------------------------------------------------------------------*\
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* Converts a socket table set ito a FD_SET structure
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* Input
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* towrite: socket table set
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* Output
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* wfds: pointer to FD_SET structure to be filled
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* max: largest descriptor value found in wfds
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* byfds: table indexed by descriptor number, with corresponding socket tables
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\*-------------------------------------------------------------------------*/
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static fd_set *tab2wfds(lua_State *L, int towrite, fd_set *wfds,
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int *max, int byfds)
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static int local_pending(lua_State *L)
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{
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int empty = 1;
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FD_ZERO(wfds);
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lua_pushnil(L);
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while (lua_next(L, towrite)) {
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p_sock sock = ls_toselectable(L);
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if (sock) { /* skip strange fields */
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NET_FD s = sock->fd;
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if (s != NET_INVALIDFD) { /* skip closed sockets */
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lua_pushnumber(L, s);
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lua_pushvalue(L, -2);
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lua_settable(L, byfds);
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if (s > *max) *max = s;
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FD_SET(s, wfds);
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empty = 0;
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}
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}
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/* get rid of value and expose index */
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lua_pop(L, 1);
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priv_pushclass(L, 1);
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lua_gettable(L, lua_upvalueindex(1));
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if (!lua_isnil(L, -1)) {
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p_fd sock = (p_fd) lua_touserdata(L, 1);
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if (sock->fd_pending(L, sock)) lua_pushnumber(L, 1);
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else lua_pushnil(L);
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}
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if (empty) return NULL;
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else return wfds;
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return 1;
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}
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/*-------------------------------------------------------------------------*\
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* Converts a socket table set ito a FD_SET structure
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* Input
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* toread: socket table set
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* Output
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* rfds: pointer to FD_SET structure to be filled
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* max: largest descriptor value found in rfds
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* byfds: table indexed by descriptor number, with corresponding socket tables
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* readable: table to receive socket table if socket is obviously readable
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* ms: will be zeroed if a readable socket is detected
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\*-------------------------------------------------------------------------*/
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static fd_set *tab2rfds(lua_State *L, int toread, fd_set *rfds,
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int *max, int byfds, int readable, int *ms)
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static int local_select(lua_State *L)
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{
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int empty = 1;
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FD_ZERO(rfds);
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lua_pushnil(L);
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while (lua_next(L, toread)) {
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p_sock sock = ls_toselectable(L);
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if (sock) { /* skip strange fields */
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NET_FD s = sock->fd;
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if (s != NET_INVALID) { /* skip closed sockets */
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/* a socket can have unread data in our internal buffer. we
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pass them straight to the readable set, and test only to
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find out which of the other sockets can be written to or
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read from immediately. */
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if (sock->vt->readable(sock)) {
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*ms = 0;
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lua_pushnumber(L, lua_getn(L, readable) + 1);
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lua_pushvalue(L, -2);
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lua_settable(L, readable);
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} else {
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lua_pushnumber(L, s);
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lua_pushvalue(L, -2);
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lua_settable(L, byfds);
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if (s > *max) *max = s;
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FD_SET(s, rfds);
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empty = 0;
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}
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}
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}
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/* get rid of value and exposed index */
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lua_pop(L, 1);
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int max_fd = (int) lua_tonumber(L, 1);
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fd_set *read_set = (fd_set *) lua_touserdata(L, 2);
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fd_set *write_set = (fd_set *) lua_touserdata(L, 3);
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int deadline = lua_isnil(L, 4) ? -1 : (int)(lua_tonumber(L, 4) * 1000);
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struct timeval tv;
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if (deadline >= 0) {
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tv.tv_sec = deadline / 1000;
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tv.tv_usec = (deadline % 1000) * 1000;
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lua_pushnumber(L, select(max_fd, read_set, write_set, NULL, &tv));
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} else {
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lua_pushnumber(L, select(max_fd, read_set, write_set, NULL, NULL));
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}
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if (empty) return NULL;
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else return rfds;
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return 1;
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}
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static int local_FD_SET(lua_State *L)
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{
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COMPAT_FD fd = (COMPAT_FD) lua_tonumber(L, 1);
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fd_set *set = (fd_set *) lua_touserdata(L, 2);
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if (fd >= 0) FD_SET(fd, set);
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return 0;
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}
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static int local_FD_ISSET(lua_State *L)
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{
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COMPAT_FD fd = (COMPAT_FD) lua_tonumber(L, 1);
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fd_set *set = (fd_set *) lua_touserdata(L, 2);
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if (fd >= 0 && FD_ISSET(fd, set)) lua_pushnumber(L, 1);
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else lua_pushnil(L);
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return 1;
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}
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