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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) 2020-2023, 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 native poll call
--
-- This submodule can be used on systems where poll system call is natively
-- supported. Microsoft Windows supports WSAPoll system call from Vista
-- version and this submodule can be used on such Windows versions too, the
-- System.OS_Constants.Poll_Linkname constant defines appropriate link name
-- for Windows. But we do not use WSAPoll in GNAT.Sockets.Poll implementation
-- for now because it is much slower than select system call, at least in
-- Windows version 10.0.18363.1016.
separate (GNAT.Sockets.Poll)
procedure Wait
(Fds : in out Set; Timeout : Interfaces.C.int; Result : out Integer)
is
function Poll
(Fds : Poll_Set;
Nfds : nfds_t;
Timeout : Interfaces.C.int) return Integer
with Import, Convention => Stdcall, External_Name => SOC.Poll_Linkname;
begin
Result := Poll (Fds.Fds, nfds_t (Fds.Length), Timeout);
end Wait;
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