- Added Policy::wants() and updated related code. Scheduler::get_ready_queue() still always returns a process queue...

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@615 3ecf2c5c-341e-0410-92b4-d18e462d057c

plugins/pyloader/src/Policy.py

@@ -92,7 +92,18 @@ class Policy:
     # @return 0+ To specify a time slice duration for this policy
     get_time_slice = AbstractMethod('get_time_slice')
 
-
+    ## @brief Returns wether this policy sorts processes or threads
+    #
+    # Should be implemented with signature:
+    # @code
+    # def wants(self):
+    #      # function body
+    # @endcode
+    #
+    # @return sgpem.policy_sorts_processes If the policy sorts processes
+    # @return sgpem.policy_sorts_threads If the policy sorts threads
+    wants =  AbstractMethod('wants')
+    
     ## @brief Returns the PolicyParameters instance you can use in
     # Policy::Policy::configure()
     #

plugins/pyloader/src/ScriptAdapter.py

@@ -95,6 +95,19 @@ class ScriptAdapter :
         self._ret_val = self._policy.get_time_slice()
         self._g_mutex.unlock()
 
+    ## @brief Asynchronously call Policy.wants()
+    #
+    # @param self The caller object
+    def async_wants(self):
+        self._g_mutex.lock(ScriptAdapter._wrap_wants, self)
+
+    def _wrap_wants(self):
+        thread.start_new_thread(ScriptAdapter._wrap_wants_callback, (self,))
+
+    def _wrap_wants_callback(self):
+        self._ret_val = self._policy.wants()
+        self._g_mutex.unlock()
+
     ## @brief Return the global shared variable with the methods' last return value
     def get_return_value(self):
         return self._ret_val

plugins/pyloader/src/builtin-policies/fcfs.py

@@ -21,6 +21,7 @@
 
 from Policy import Policy
 import sys
+from sgpem import policy_sorts_processes
 
 class fcfs(Policy) :
     def __init__(self):
@@ -35,6 +36,9 @@ class fcfs(Policy) :
     def get_time_slice(self):
         return -2
 
+    def wants(self):
+	return policy_sorts_processes
+
     def sort_queue(self, queue):
         cmpf = lambda a, b: \
             a.get_schedulable().get_arrival_time() < \

plugins/pyloader/src/builtin-policies/sjf.py

@@ -21,6 +21,7 @@
 
 from Policy import Policy
 import sys
+from sgpem import policy_sorts_processes
 
 class sjf(Policy) :
     def __init__(self):
@@ -35,6 +36,9 @@ class sjf(Policy) :
     def get_time_slice(self):
         return -1
 
+    def wants(self):
+	return policy_sorts_processes
+
     def sort_queue(self, queue):
         cmpf = lambda a, b: \
             a.get_cpu_time_left() < \

plugins/pyloader/src/python_policy.cc

@@ -138,7 +138,8 @@ PythonPolicy::is_pre_emptive() const throw(UserInterruptException)
 
 
 int
-PythonPolicy::get_time_slice() const throw(UserInterruptException) {
+PythonPolicy::get_time_slice() const throw(UserInterruptException) 
+{
   PyObject* retval = PyObject_CallMethod(_adapter, "async_get_time_slice", NULL);
   Py_DECREF(retval);
   
@@ -153,6 +154,27 @@ PythonPolicy::get_time_slice() const throw(UserInterruptException) {
   return tmp < 0 ? numeric_limits<int>::max() : static_cast<int>(tmp);
 }
 
+policy_sorts_type
+PythonPolicy::wants() const throw(UserInterruptException) 
+{
+  PyObject* retval = PyObject_CallMethod(_adapter, "async_wants", NULL);
+  Py_DECREF(retval);
+  
+  wait_unlock();
+  
+  // Parse return value stored in global Python object
+  retval = PyObject_CallMethod(_adapter, "get_return_value", NULL);
+  assert(retval);
+  long tmp = PyInt_AsLong(retval);
+  Py_DECREF(retval);
+
+  //FIXME add the MalformedPolicyException class and throw it the else
+  // branch instead
+  if(tmp == policy_sorts_threads || tmp == policy_sorts_processes)
+    return static_cast<policy_sorts_type>(tmp);
+  else
+    return policy_sorts_processes;
+}
     
 void
 PythonPolicy::wait_unlock() const throw(UserInterruptException)

plugins/pyloader/src/python_policy.hh

@@ -72,7 +72,9 @@ namespace sgpem
     /**
     	\returns The integer value of its time-slice.
     */
-    int              get_time_slice() const throw(UserInterruptException);
+    int				get_time_slice() const throw(UserInterruptException);
+
+    policy_sorts_type		wants() const throw(UserInterruptException);
 
   private:
     PythonPolicy(const PythonPolicy&);

plugins/pyloader/src/sgpem.i

@@ -38,6 +38,9 @@ namespace std {
 
 namespace sgpem {
 
+    /** Don't get worried, order is not important! */
+    enum policy_sorts_type { policy_sorts_threads, policy_sorts_processes };
+
     class Policy {
     public:
 	virtual ~Policy() = 0;

src/backend/policy.hh

@@ -33,6 +33,12 @@
 namespace sgpem
 {
 
+	enum policy_sorts_type
+	{
+	  policy_sorts_threads,
+	  policy_sorts_processes
+	};
+
 	class Policy;
 	
   	/**	\brief 
@@ -44,6 +50,7 @@ namespace sgpem
 	class SG_DLLEXPORT Policy 
 	{
 	public:
+	
 		virtual ~Policy();
 	  
 		/**
@@ -95,7 +102,17 @@ namespace sgpem
 		  \return Time quantum for the policy.
 		 */
 		virtual int get_time_slice() const throw(UserInterruptException) = 0;
-	  
+
+		/**
+		  Tell what kind of entities are scheduled by this policy.
+
+		  Because it's a pure virtual method, must be re-implemented 
+		  in concrete derived classes.
+		  \return A SortsType value identifying the desired type for the objects
+		   composing the queue passed to the sort_queue method.
+		 */
+ 		virtual policy_sorts_type wants() const throw(UserInterruptException) = 0;
+ 
 		/**
 		  Gets the parameters related with this policy.
 

src/backend/scheduler.cc

@@ -49,6 +49,7 @@ Scheduler::get_instance()
 SchedulableQueue*			
 Scheduler::get_ready_queue()
 {
+  // FIXME return the correct queue accordingly to the value returned by Policy::wants()
   return &_ready_queue;	
 }