Print_Function_Values
 The following values are used in the verbosity argument to print
 member functions:

 0		Requests a brief report

CHAIN		Requests information about tasks on the object's
		remember chain, and about other objects on the
		object's o_next chain

 STACK		Requests information about the run-time stack

 VERBOSE	Requests detailed information on the class object

Queue_Mode_Values
 The following values are used by the qhead and qtail classes for
 managing queues:

EMODE		Generates a run-time error if full on enqueue or empty
		on dequeue

WMODE		Suspends task execution if full on enqueue or empty on
		dequeue

 ZMODE		Returns NULL if full on enqueue or empty on dequeue

Exception_Codes
 The following codes handle exceptions for the classes indicated:

 E_OLINK = 1		Cannot delete an object with a remembered task
			(object class) 

 E_ONEXT = 2		Cannot delete an object which is on a list
			(object class) 

 E_GETEMPTY = 3		Cannot get an object from an empty queue
			(qhead class) 

 E_PUTOBJ = 4		Cannot put an object into a full queue (qtail
			class) 

 E_PUTFULL = 5		Cannot put an object into a queue if the object
			is on another queue (qtail class) 

 E_BACKOBJ = 6		Cannot putback an object into a queue if the
			object is on another queue (qhead class)

 E_BACKFULL = 7		Cannot putback an object into a full queue
			(qhead class) 

 E_SETCLOCK = 8		Cannot set the clock after it has advanced
			past 0 (sched class)

 E_CLOCKIDLE = 9	Cannot advance the clock when clock_task is
			RUNNING or TERMINATED (sched class) 

 E_RESTERM = 10		Cannot resume a TERMINATED task (sched class) 

 E_RESRUN = 11		Cannot resume a RUNNING task (sched class) 

 E_NEGTIME = 12		Cannot delay a negative amount of time (sched
			class) 

 E_RESOBJ = 13		Cannot resume a task or timer if it is already
			on another queue (sched class) 

 E_HISTO = 14		Cannot construct a histogram with less than 1
			bucket or the left not less than the right
			(histogram class)

 E_STACK = 15		Cannot extend stack (task class) 

 E_STORE = 16		Cannot allocate more memory (object, qhead,
			qtail, and task classes) 

 E_TASKMODE = 17	Cannot create a task with a mode other than
			DEDICATED or SHARED (task class) 

 E_TASKDEL = 18		Cannot delete a task which is IDLE or RUNNING
			(task class) 

 E_TASKPRE = 19		Cannot preempt a task which is IDLE or
			TERMINATED (task class) 

 E_TIMERDEL = 20	Cannot delete a timer which is IDLE or RUNNING
			(timer class) 

 E_SCHTIME = 21		Cannot execute something at a time which
			already passed (sched class) 

 E_SCHOBJ = 22		Cannot use class sched other than as a base
			class (sched class) 

 E_QDEL = 23		Cannot delete a queue which has an object in
			the queue (qhead and qtail classes) 

 E_RESULT = 24		Cannot call result() on thistask (task class) 

 E_WAIT = 25		Cannot call wait() on thistask (task class) 

 E_FUNCS = 26		Encountered an unexpected exception or access
                        violation

 E_FRAMES = 27		Not used in DEC C++

 E_REGMASK = 28		Not used in DEC C++

 E_FUDGE_SIZE = 29	Not used in DEC C++

 E_NO_HNDLR = 30	Cannot handle a signal for which there is no
			handler (Interrupt_handler class) 

 E_BADSIG = 31		Cannot handle a signal with an invalid signal
			number (Interrupt_handler class) 

 E_LOSTHNDLR = 32	Cannot handle a signal which is not on a stack
			of them for the given signal
			(Interrupt_handler class) 

 E_TASKNAMEOVERRUN = 33 Not used in DEC C++

Maximum_stack_size
 To keep track of the maximum stack size that can be printed by the
 function task::print(), set the _hwm (high-water marking) data
 member to a nonzero value before creation of the first task.

 Declaration:

 extern int _hwm