+/** @file action.h
+ * @brief Models actions taken by threads.
+ */
+
#ifndef __ACTION_H__
#define __ACTION_H__
#include <list>
+#include <cstddef>
-#include "libthreads.h"
-#include "libatomic.h"
#include "threads.h"
-
+#include "libatomic.h"
+#include "mymemory.h"
#define VALUE_NONE -1
typedef enum action_type {
THREAD_YIELD,
THREAD_JOIN,
ATOMIC_READ,
- ATOMIC_WRITE
+ ATOMIC_WRITE,
+ ATOMIC_RMW
} action_type_t;
-/* Forward declaration (tree.h) */
-class TreeNode;
+/* Forward declaration */
+class Node;
+class ClockVector;
+/**
+ * The ModelAction class encapsulates an atomic action.
+ */
class ModelAction {
public:
ModelAction(action_type_t type, memory_order order, void *loc, int value);
- void print(void);
-
- thread_id_t get_tid() { return tid; }
- action_type get_type() { return type; }
- memory_order get_mo() { return order; }
- void * get_location() { return location; }
-
- TreeNode * get_node() { return node; }
- void set_node(TreeNode *n) { node = n; }
-
- bool is_read();
- bool is_write();
- bool is_acquire();
- bool is_release();
- bool same_var(ModelAction *act);
- bool same_thread(ModelAction *act);
- bool is_dependent(ModelAction *act);
+ ~ModelAction();
+ void print(void) const;
+
+ thread_id_t get_tid() const { return tid; }
+ action_type get_type() const { return type; }
+ memory_order get_mo() const { return order; }
+ void * get_location() const { return location; }
+ int get_seq_number() const { return seq_number; }
+
+ Node * get_node() const { return node; }
+ void set_node(Node *n) { node = n; }
+
+ bool is_read() const;
+ bool is_write() const;
+ bool is_rmw() const;
+ bool is_acquire() const;
+ bool is_release() const;
+ bool is_seqcst() const;
+ bool same_var(const ModelAction *act) const;
+ bool same_thread(const ModelAction *act) const;
+ bool is_synchronizing(const ModelAction *act) const;
+
+ void create_cv(ModelAction *parent = NULL);
+ ClockVector * get_cv() const { return cv; }
+ void read_from(ModelAction *act);
+
+ bool happens_before(ModelAction *act);
+
+ inline bool operator <(const ModelAction& act) const {
+ return get_seq_number() < act.get_seq_number();
+ }
+ inline bool operator >(const ModelAction& act) const {
+ return get_seq_number() > act.get_seq_number();
+ }
+
+ MEMALLOC
private:
+
+ /** Type of action (read, write, thread create, thread yield, thread join) */
action_type type;
+
+ /** The memory order for this operation. */
memory_order order;
+
+ /** A pointer to the memory location for this action. */
void *location;
+
+ /** The thread id that performed this action. */
thread_id_t tid;
+
+ /** The value read or written (if RMW, then the value written). This
+ * should probably be something longer. */
int value;
- TreeNode *node;
+
+ /** A back reference to a Node in NodeStack, if this ModelAction is
+ * saved on the NodeStack. */
+ Node *node;
+
+ int seq_number;
+
+ /** The clock vector stored with this action; only needed if this
+ * action is a store release? */
+ ClockVector *cv;
};
typedef std::list<class ModelAction *> action_list_t;