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[Ada] Fix implementation of the vectored sockets on Windows

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Pascal Obry <obry at adacore dot com>
Date: Tue, 22 Jun 2010 10:36:53 +0200
Subject: [Ada] Fix implementation of the vectored sockets on Windows

Fix a race condition in the way the vectored sockets
emulation was implemented on Windows. Also fix the
way the vectors are filled.

Tested on i686-pc-mingw32, committed on trunk

2010-06-22  Pascal Obry  <obry@adacore.com>

	* g-socthi-mingw.adb: Fix implementation of the vectored sockets on
	Windows.
	(C_Recvmsg): Make sure the routine is atomic. Also fully
	fill vectors in the proper order.
	(C_Sendmsg): Make sure the routine is atomic.

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