def is_valid_proc_pid(self, pid):
try:
Process.cache(pid)
except KeyError:
raise ex.exceptions.InvalidProcId(\
"Process with pid " + str(pid) + " not added to " +\
"scheduler"
)
return True
def proc_priority(self, entity, new_priority = None):
try:
pid = entity.pid
except AttributeError:
pid = entity
if self.is_valid_proc_pid(pid):
if new_priority is None:
return Process.cache(pid).priority
# decide the priority op - inc or dec?
proc = Process.cache(pid)
old_priority = proc.priority
op = 'dec'
if new_priority > old_priority:
op = 'inc'
proc.priority = new_priority
self.runq.update_key(pid, new_priority, op)
if self.debug:
self.dump_runq()
return True
def dump_runq(self):
q_iter = self.runq.get_iter()
proc_list = []
while (1):
try:
pid = q_iter.next()
proc = Process.cache(pid)
proc_list.append(str(proc))
except StopIteration:
break
if len(proc_list) > 0:
proc_list.append("\n")
return ' '.join(proc_list)
def extract_qualifier_proc(self):
max_proc = Process.cache(self.runq.extract_max())
if self.debug:
print self
return max_proc
def read_qualifier_proc(self):
if self.debug:
print self
return Process.cache(self.runq.maximum())
def cmp_proc_priority(self, id1, id2):
if self.is_valid_proc_pid(id1) and \
self.is_valid_proc_pid(id2):
return Process.cache(id1).priority - \
Process.cache(id2).priority
