Wait and block for the results to be generated for the pending sleigh job.
If the job has completed, then waitSleigh returns immediately with
the generated results.
Usage
## S3 method for class 'sleighPending':
waitSleigh(.Object)
Arguments
.Object
a sleighPending class object
Details
The sleighPending class object, .Object, is usually obtained
from the return value of non-blocking eachElem or non-blocking
eachWorker.
s = sleigh()
eo = list(blocking=0)
sp = eachWorker(s, function() {Sys.sleep(100)}, eo=eo)
waitSleigh(sp) # wait on workers. Each worker sleeps for 100 seconds