NAME
    AllocSignal -- allocate a signal bit

SYNOPSIS
    signalNum = AllocSignal(signalNum)
    D0                      D0

    BYTE AllocSignal(BYTE);

FUNCTION
    Allocate a signal bit from the current tasks' pool.  Either a
    particular bit, or the next free bit may be allocated.  The signal
    associated with the bit will be properly initialized (cleared).  At
    least 16 user signals are available per task.  Signals should be
    deallocated before the task exits.

    If the signal is already in use (or no free signals are available)
    a -1 is returned.

    Allocated signals are only valid for use with the task that
    allocated them.


WARNING
    Signals may not be allocated or freed from exception handling code.

INPUTS
    signalNum - the desired signal number {of 0..31} or -1 for no
                preference.

RESULTS
    signalNum - the signal bit number allocated {0..31}. If no signals
                are available, this function returns -1.

SEE ALSO
    FreeSignal