| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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) 2020-2021, 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; |
