2014-07-30  Bob Duff  <duff@adacore.com>

	* s-tasuti.ads, s-tasuti.adb (Make_Independent): Change this
	from a procedure to a function, so that it can more easily be
	called before the "begin" of a task.
	* s-taasde.ads (Delay_Block): Make this type immutably limited,
	so we can use a build-in-place function call to initialize
	Timer_Queue in the body.
	* a-rttiev.adb, s-asthan-vms-alpha.adb, s-asthan-vms-ia64.adb,
	* s-interr.adb, s-interr-hwint.adb, s-interr-sigaction.adb,
	* s-interr-vms.adb, s-taasde.adb: Each independent task now calls
	Make_Independent before reaching its "begin", to avoid race
	conditions. This causes the activating task to wait until after
	Make_Independent is complete before proceeding.  In addition,
	we initialize data structures used by independent tasks before
	activating those tasks, to avoid possible use of uninitialized data.
	* s-interr.ads, s-intman.ads, s-taspri-posix.ads, s-tasdeb.ads:
	Minor comment fixes.

2014-07-30  Bob Duff  <duff@adacore.com>

	* a-exctra.ads, s-traent-vms.ads, s-traent.ads (Tracebacks_Array): Move
	the declaration of Tracebacks_Array from Ada.Exceptions.Traceback to
	System.Traceback_Entries (s-traent.ads and s-traent-vms.ads).  Add
	subtypes renaming Tracebacks_Array in Ada.Exceptions.Traceback.
	* g-debpoo.adb: Refer to Tracebacks_Array in its new home.

2014-07-30  Arnaud Charlet  <charlet@adacore.com>

	* a-tasatt.adb: Remove old comments.

From-SVN: r213256