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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . S O C K E T S . P O L L . W A I T --
-- --
-- B o d y --
-- --
-- Copyright (C) 2020-2022, AdaCore --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- Wait implementation on top of Windows select call
--
-- Microsoft Windows from Vista version has WSAPoll function in API which is
-- similar to POSIX poll call, but experiments show that the WSAPoll is much
-- slower than select at least in Windows version 10.0.18363.1016.
with GNAT.Sockets.Poll.G_Wait;
separate (GNAT.Sockets.Poll)
procedure Wait
(Fds : in out Set; Timeout : Interfaces.C.int; Result : out Integer)
is
use Interfaces;
type FD_Array is array (1 .. Fds.Length) of FD_Type
with Convention => C;
type FD_Set_Type is record
Count : C.int;
Set : FD_Array;
end record with Convention => C;
procedure Reset_Socket_Set (Set : in out FD_Set_Type) with Inline;
procedure Insert_Socket_In_Set (Set : in out FD_Set_Type; FD : FD_Type)
with Inline;
function Is_Socket_In_Set (Set : FD_Set_Type; FD : FD_Type) return C.int
with Import, Convention => C,
External_Name => "__gnat_is_socket_in_set";
--------------------------
-- Insert_Socket_In_Set --
--------------------------
procedure Insert_Socket_In_Set (Set : in out FD_Set_Type; FD : FD_Type) is
begin
Set.Count := Set.Count + 1;
Set.Set (Integer (Set.Count)) := FD;
end Insert_Socket_In_Set;
----------------------
-- Reset_Socket_Set --
----------------------
procedure Reset_Socket_Set (Set : in out FD_Set_Type) is
begin
Set.Count := 0;
end Reset_Socket_Set;
----------
-- Poll --
----------
procedure Poll is new G_Wait
(FD_Set_Type, Reset_Socket_Set, Insert_Socket_In_Set, Is_Socket_In_Set);
begin
Poll (Fds, Timeout, Result);
end Wait;
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