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[Ada] Fix error handling of Create_Task when thread creation failed

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Date: Wed, 26 Mar 2008 09:05:01 +0100
Subject: [Ada] Fix error handling of Create_Task when thread creation failed

Tested on i686-linux, committed on trunk

Fix error handling of Create_Task when thread creation failed (e.g. when
resources are exhausted), and the run-time attempted operations on a non
existing thread, leading to SEGV or hangs.
The program below should run silently to completion (all tasks will receive
a tasking_error exception and terminate silently):

See gnat.dg/too_many_tasks.adb

2008-03-26  Arnaud Charlet  <charlet@adacore.com>

	* s-taprop-irix.adb, s-taprop-tru64.adb, s-taprop-lynxos.adb, 
	s-taprop-linux.adb, s-taprop-mingw.adb, s-taprop-vxworks.adb, 
	s-taprop-posix.adb (Create_Task): Do not attempt to set task priority
	or task info if the thread could not be created.

Attachment: difs
Description: Text document

Follow-Ups:
- Re: [Ada] Fix error handling of Create_Task when thread creation failed
  - From: Richard Guenther

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