Support delete a fd event.

When you call the fd_add, it will return an object with `delete` method.
So you can delete that event if you want.

Signed-off-by: Xiongfei(Alex) Guo <xfguo@credosemi.com>

diff --git a/examples/uloop-example.lua b/examples/uloop-example.lua
index ba34ec5..9b0684e 100755 (executable)
--- a/examples/uloop-example.lua
+++ b/examples/uloop-example.lua
@@ -46,20 +46,31 @@ uloop.timer(
        end, 2000
 )
 
-uloop.fd_add(udp, function(ufd, events)
+udp_ev = uloop.fd_add(udp, function(ufd, events)
        local words, msg_or_ip, port_or_nil = ufd:receivefrom()
        print('Recv UDP packet from '..msg_or_ip..':'..port_or_nil..' : '..words)
+       if words == "Stop!" then
+               udp_ev:delete()
+       end
 end, uloop.ULOOP_READ)
 
+udp_count = 0
 udp_send_timer = uloop.timer(
        function()
                local s = socket.udp()
-               local words = 'Hello!'
+               local words
+               if udp_count > 3 then
+                       words = "Stop!"
+                       udp_send_timer:cancel()
+               else
+                       words = 'Hello!'
+                       udp_send_timer:set(1000)
+               end
                print('Send UDP packet to 127.0.0.1:8080 :'..words)
                s:sendto(words, '127.0.0.1', 8080)
                s:close()
 
-               udp_send_timer:set(1000)
+               udp_count = udp_count + 1
        end, 3000
 )
 

diff --git a/lua/uloop.c b/lua/uloop.c
index c71d537..df57b8a 100644 (file)
--- a/lua/uloop.c
+++ b/lua/uloop.c
@@ -172,6 +172,24 @@ static int get_sock_fd(lua_State* L, int idx) {
        return fd;
 }
 
+static int ul_ufd_delete(lua_State *L)
+{
+       struct lua_uloop_fd *ufd = lua_touserdata(L, 1);
+
+       uloop_fd_delete(&ufd->fd);
+       lua_getglobal(state, "__uloop_cb");
+       luaL_unref(L, -1, ufd->r);
+       lua_getglobal(state, "__uloop_fds");
+       luaL_unref(L, -1, ufd->fd_r);
+
+       return 1;
+}
+
+static const luaL_Reg ufd_m[] = {
+       { "delete", ul_ufd_delete },
+       { NULL, NULL }
+};
+
 static int ul_ufd_add(lua_State *L)
 {
        struct lua_uloop_fd *ufd;
@@ -205,6 +223,18 @@ static int ul_ufd_add(lua_State *L)
        lua_pop(L, 1);
 
        ufd = lua_newuserdata(L, sizeof(*ufd));
+
+       lua_createtable(L, 0, 2);
+       lua_pushvalue(L, -1);
+       lua_setfield(L, -2, "__index");
+       lua_pushcfunction(L, ul_ufd_delete);
+       lua_setfield(L, -2, "__gc");
+       lua_pushvalue(L, -1);
+       lua_setmetatable(L, -3);
+       lua_pushvalue(L, -2);
+       luaI_openlib(L, NULL, ufd_m, 1);
+       lua_pushvalue(L, -2);
+
        memset(ufd, 0, sizeof(*ufd));
 
        ufd->r = ref;