[Ada] Do not indicate a pending abort if the task is already aborting

Pierre-Marie de Rodat derodat@adacore.com
Tue Nov 9 09:46:20 GMT 2021

Check_Abort_Status would return the equivalent of True while a task was
in the process of aborting causing another Abort exception to be raised
and not to terminate cleanly. This only affects targets that use stack
check emulation, which is currently limited to RTEMS.

Tested on x86_64-pc-linux-gnu, committed on trunk


	* libgnarl/s-tasini.adb (Check_Abort_Status): Don't return 1 if
	the task is aborting.
	* libgnarl/s-tasini.ads (Check_Abort_Status): Update comment.
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