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[Ada] work around scheduling bug on vxworks

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Jose Ruiz <ruiz at adacore dot com>
Date: Tue, 31 Oct 2006 20:56:45 +0100
Subject: [Ada] work around scheduling bug on vxworks

Tested on i686-linux, committed on trunk.

Some schedulers on some OSs (such as VxWorks) do not support the Priority
Ceiling Protocol but the Priority-Inheritance Protocol, so the scheduling of
the different tasks is not as expected. We add a dispatching point when
requeuing a task to the same protected object to compensate the scheduling
policy and give higher priority tasks the opportunity to execute.

2006-10-31  Jose Ruiz  <ruiz@adacore.com>

	* s-tpobop.adb (Requeue_Call): Introduce a dispatching point when
	requeuing to the same protected object to give higher priority tasks
	the opportunity to execute.

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