diff options
Diffstat (limited to 'src/luaevent.c')
| -rw-r--r-- | src/luaevent.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/src/luaevent.c b/src/luaevent.c new file mode 100644 index 0000000..38f19ce --- /dev/null +++ b/src/luaevent.c @@ -0,0 +1,184 @@ +/* LuaEvent - Copyright (C) 2007 Thomas Harning <harningt@gmail.com> + * Licensed as LGPL - See doc/COPYING for details */ + #include "luaevent.h" + +#include <lua.h> +#include <lauxlib.h> +#include <assert.h> + +#define EVENT_BASE_MT "EVENT_BASE_MT" +#define EVENT_CALLBACK_ARG_MT "EVENT_CALLBACK_ARG_MT" +#define MAIN_THREAD_LOCATION 1 + +void setMainThread(lua_State* L) { + lua_pushthread(L); + lua_rawseti(L, LUA_ENVIRONINDEX, MAIN_THREAD_LOCATION); +} +lua_State* getMainThread(lua_State* L) { + lua_State* g_L; + lua_rawgeti(L, LUA_ENVIRONINDEX, MAIN_THREAD_LOCATION); + g_L = lua_tothread(L, -1); + lua_pop(L, 1); + return g_L; +} + +int luaevent_newbase(lua_State* L) { + le_base *base = (le_base*)lua_newuserdata(L, sizeof(le_base)); + base->loop_L = NULL; /* No running loop */ + base->base = event_init(); + luaL_getmetatable(L, EVENT_BASE_MT); + lua_setmetatable(L, -2); + return 1; +} + +void freeCallbackArgs(le_callback* arg, lua_State* L) { + if(arg->base) { + arg->base = NULL; + event_del(&arg->ev); + luaL_unref(L, LUA_REGISTRYINDEX, arg->callbackRef); + } +} +/* le_callback is allocated at the beginning of the coroutine in which it +is used, no need to manually de-allocate */ + +/* Index for coroutine is fd as integer for *nix, as lightuserdata for Win */ +static void luaevent_callback(int fd, short event, void* p) { + le_callback* arg = p; + lua_State* L; + int ret; + assert(arg && arg->base && arg->base->loop_L); + L = arg->base->loop_L; + lua_rawgeti(L, LUA_REGISTRYINDEX, arg->callbackRef); + lua_pushinteger(L, event); + lua_call(L, 1, 1); + ret = lua_tointeger(L, -1); + lua_pop(L, 1); + if(ret == -1) { + freeCallbackArgs(arg, L); + } else { + struct event *ev = &arg->ev; + int newEvent = ret; + if(newEvent != event) { // Need to hook up new event... + event_del(ev); + event_set(ev, fd, EV_PERSIST | newEvent, luaevent_callback, arg); + event_add(ev, NULL); + } + } +} + +static int luaevent_base_gc(lua_State* L) { + le_base *base = luaL_checkudata(L, 1, EVENT_BASE_MT); + if(base->base) { + event_base_free(base->base); + base->base = NULL; + } + return 0; +} + +static int luaevent_cb_gc(lua_State* L) { + le_callback* arg = luaL_checkudata(L, 1, EVENT_CALLBACK_ARG_MT); + freeCallbackArgs(arg, L); + return 0; +} + +int getSocketFd(lua_State* L, int idx) { + int fd; + luaL_checktype(L, idx, LUA_TUSERDATA); + lua_getfield(L, idx, "getfd"); + if(lua_isnil(L, -1)) + return luaL_error(L, "Socket type missing 'getfd' method"); + lua_pushvalue(L, idx); + lua_call(L, 1, 1); + fd = lua_tointeger(L, -1); + lua_pop(L, 1); + return fd; +} + +/* sock, event, callback */ +static int luaevent_addevent(lua_State* L) { + int fd, event, callbackRef; + le_callback* arg; + le_base *base = luaL_checkudata(L, 1, EVENT_BASE_MT); + fd = getSocketFd(L, 2); + event = luaL_checkinteger(L, 3); + luaL_checktype(L, 4, LUA_TFUNCTION); + lua_pushvalue(L, 4); + callbackRef = luaL_ref(L, LUA_REGISTRYINDEX); + arg = lua_newuserdata(L, sizeof(*arg)); + luaL_getmetatable(L, EVENT_CALLBACK_ARG_MT); + lua_setmetatable(L, -2); + + arg->base = base; + arg->callbackRef = callbackRef; + /* Setup event... */ + event_set(&arg->ev, fd, event | EV_PERSIST, luaevent_callback, arg); + event_base_set(base->base, &arg->ev); + event_add(&arg->ev, NULL); + return 1; +} + +static int luaevent_loop(lua_State* L) { + le_base *base = luaL_checkudata(L, 1, EVENT_BASE_MT); + base->loop_L = L; + int ret = event_base_loop(base->base, 0); + lua_pushinteger(L, ret); + return 1; +} + +static luaL_Reg base_funcs[] = { + { "addevent", luaevent_addevent }, + { "loop", luaevent_loop }, + { NULL, NULL } +}; + +static luaL_Reg funcs[] = { + { "new", luaevent_newbase }, + { NULL, NULL } +}; + +typedef struct { + const char* name; + int value; +} namedInteger; + +static namedInteger consts[] = { + {"LEAVE", -1}, + {"EV_READ", EV_READ}, + {"EV_WRITE", EV_WRITE}, + {NULL, 0} +}; + +void setNamedIntegers(lua_State* L, namedInteger* p) { + while(p->name) { + lua_pushinteger(L, p->value); + lua_setfield(L, -2, p->name); + p++; + } +} + +/* Verified ok */ +int luaopen_luaevent_core(lua_State* L) { + /* Setup environ table */ + lua_createtable(L, 1, 0); + lua_replace(L, LUA_ENVIRONINDEX); + /* Setup metatable */ + luaL_newmetatable(L, EVENT_BASE_MT); + lua_newtable(L); + luaL_register(L, NULL, base_funcs); + lua_setfield(L, -2, "__index"); + lua_pushcfunction(L, luaevent_base_gc); + lua_setfield(L, -2, "__gc"); + lua_pop(L, 1); + luaL_newmetatable(L, EVENT_CALLBACK_ARG_MT); + lua_pushcfunction(L, luaevent_cb_gc); + lua_setfield(L, -2, "__gc"); + lua_newtable(L); + lua_pushcfunction(L, luaevent_cb_gc); + lua_setfield(L, -2, "close"); + lua_setfield(L, -2, "__index"); + lua_pop(L, 1); + + luaL_register(L, "luaevent.core", funcs); + setNamedIntegers(L, consts); + return 1; +} |