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--  Wait implementation on top of windows select call

separate (AWS.Net.Poll_Events)

procedure Wait
  (Fds : in out Set; Timeout : Timeout_Type; Result : out Integer)
is
   use Interfaces;
   use type C.int;

   type FD_Array is array (1 .. Fds.Length) of OS_Lib.FD_Type;
   pragma Convention (C, FD_Array);

   type FD_Set_Type is record
      Count : C.int;
      Set   : FD_Array;
   end record;
   pragma Convention (C, FD_Set_Type);

   procedure FD_ZERO (Set : in out FD_Set_Type);
   pragma Inline (FD_ZERO);

   procedure FD_SET (FD : OS_Lib.FD_Type; Set : in out FD_Set_Type);
   pragma Inline (FD_SET);

   function FD_ISSET (FD : OS_Lib.FD_Type; Set : FD_Set_Type) return C.int;
   pragma Import (Stdcall, FD_ISSET, "__WSAFDIsSet");

   ------------
   -- FD_SET --
   ------------

   procedure FD_SET (FD : OS_Lib.FD_Type; Set : in out FD_Set_Type) is
   begin
      Set.Count := Set.Count + 1;
      Set.Set (Integer (Set.Count)) := FD;
   end FD_SET;

   -------------
   -- FD_ZERO --
   -------------

   procedure FD_ZERO (Set : in out FD_Set_Type) is
   begin
      Set.Count := 0;
   end FD_ZERO;

   procedure Poll is new G_Poll (FD_Set_Type, FD_ZERO, FD_SET, FD_ISSET);

begin
   Poll (Fds, Timeout, Result);
end Wait;
