* s-taprop-vxworks.adb, s-taprop-tru64.adb, s-taprop-mingw.adb,
s-taprop-linux.adb, s-taprop-solaris.adb, s-taprop-irix.adb,
s-taprop-hpux-dce.adb, s-taprop-posix.adb
(Enter_Task): Move Known_Tasks initialization to s-tassta.adb
* s-taprop-vms.adb (Enter_Task): Likewise.
(Initialize): Import DBEXT, Debug_Register. Register DBGEXT callback.
* s-tassta.adb (Activate_Tasks): After task creation set state to
Activating, vice Runnable. Initialize Known_Tasks, moved here from
s-taprop.adb (Enter_Task). Set Debug_Event_Activating for debugger.
Set state to Runnable after above.
(Task_Wrapper): Set Debug_Event_Run. In exception block set
Debug_Event_Terminated.
* s-taskin.ads (Task_States): Add new states Activiting and
Activator_Delay_Sleep.
(Bit_Array, Debug_Event_Array): New types.
(Global_Task_Debug_Event_Set: New flag.
(Common_ATCB): New field Debug_Events.
* s-taskin.adb (Initialize_ATCB): Initialize Debug_Events.
* s-tasren.adb (Timed_Selective_Wait): Set Activator_Delay_Sleep vice
Activator_Sleep.
* s-tasini.adb (Locked_Abort_To_Level): Add case alternatives for when
Activating and when Acceptor_Delay_Sleep.
* s-tasdeb.ads: Add constants for Debug_Events.
(Debug_Event_Kind_Type): New subtype.
(Signal_Debug_Event): New subprogram.
* s-tasdeb.adb (Signal_Debug_Event): New null subprogram.
From-SVN: r146155
