update G-EDF implementation.

simso/schedulers/EDF.py

@@ -7,27 +7,20 @@ from simso.core import Scheduler
 
 class EDF(Scheduler):
     """Earliest Deadline First"""
-    def init(self):
-        self.ready_list = []
-
     def on_activate(self, job):
-        self.ready_list.append(job)
         job.cpu.resched()
 
     def on_terminated(self, job):
-        if job in self.ready_list:
-            self.ready_list.remove(job)
-        else:
-            job.cpu.resched()
+        job.cpu.resched()
 
     def schedule(self, cpu):
-        ready_jobs = [j for j in self.ready_list if j.is_active()]
+        # List of ready jobs not currently running:
+        ready_jobs = [t.job for t in self.task_list
+                      if t.is_active() and not t.job.is_running()]
 
         if ready_jobs:
-            # Key explanations:
-            # First the free processors
-            # Among the others, get the one with the greatest deadline
-            # If equal, take the one used to schedule
+            # Select a free processor or, if none,
+            # the one with the greatest deadline (self in case of equality):
             key = lambda x: (
                 1 if not x.running else 0,
                 x.running.absolute_deadline if x.running else 0,
@@ -35,11 +28,10 @@ class EDF(Scheduler):
             )
             cpu_min = max(self.processors, key=key)
 
+            # Select the job with the least priority:
             job = min(ready_jobs, key=lambda x: x.absolute_deadline)
 
             if (cpu_min.running is None or
                     cpu_min.running.absolute_deadline > job.absolute_deadline):
-                self.ready_list.remove(job)
-                if cpu_min.running:
-                    self.ready_list.append(cpu_min.running)
+                print(self.sim.now(), job.name, cpu_min.name)
                 return (job, cpu_min)

simso/schedulers/EDF2.py

 """
 Implementation of the Global-EDF (Earliest Deadline First) for multiprocessor
-architectures.
+architectures (alternative implementation as the one provided by EDF.py).
 """
 from simso.core import Scheduler