X-Git-Url: http://plrg.eecs.uci.edu/git/?p=model-checker.git;a=blobdiff_plain;f=model.h;h=1b6bb10a285e4046e4b9bbe727526abf1849f071;hp=98b9d5fffe3ea9c3c4827a3c9475e9328dec947e;hb=dae59b7e635c23bc78f27177f64e184d7642ef59;hpb=2627422b8bfba845fc2583032b96d581b72d0e4d

diff --git a/model.h b/model.h
index 98b9d5f..1b6bb10 100644
--- a/model.h
+++ b/model.h
@@ -30,6 +30,20 @@ class Promise;
 struct model_params {
 };
 
+/**
+ * Structure for holding small ModelChecker members that should be snapshotted
+ */
+struct model_snapshot_members {
+	ModelAction *current_action;
+	int next_thread_id;
+	modelclock_t used_sequence_numbers;
+	Thread *nextThread;
+	ModelAction *next_backtrack;
+
+	/** @see ModelChecker::lazy_sync_size */
+	unsigned int lazy_sync_size;
+};
+
 /** @brief The central structure for model-checking */
 class ModelChecker {
 public:
@@ -42,8 +56,6 @@ public:
 	/** Prints an execution summary with trace information. */
 	void print_summary();
 
-	Thread * schedule_next_thread();
-
 	void add_thread(Thread *t);
 	void remove_thread(Thread *t);
 	Thread * get_thread(thread_id_t tid) { return thread_map->get(id_to_int(tid)); }
@@ -57,20 +69,25 @@ public:
 
 	int switch_to_master(ModelAction *act);
 	ClockVector * get_cv(thread_id_t tid);
+	ModelAction * get_parent_action(thread_id_t tid);
 	bool next_execution();
 	bool isfeasible();
 	bool isfinalfeasible();
 	void check_promises(ClockVector *old_cv, ClockVector * merge_cv);
+	void get_release_seq_heads(ModelAction *act,
+	                std::vector<const ModelAction *> *release_heads);
 
 	void finish_execution();
+	bool isfeasibleprefix();
+	void set_assert() {asserted=true;}
 
 	MEMALLOC
 private:
 	/** The scheduler to use: tracks the running/ready Threads */
 	Scheduler *scheduler;
 
-	int next_thread_id;
-	modelclock_t used_sequence_numbers;
+	bool has_asserted() {return asserted;}
+	void reset_asserted() {asserted=false;}
 	int num_executions;
 
 	const model_params params;
@@ -81,32 +98,32 @@ private:
 	 * data between them.
 	 * @param act The ModelAction created by the user-thread action
 	 */
-	void set_current_action(ModelAction *act) { current_action = act; }
-	void check_current_action();
+	void set_current_action(ModelAction *act) { priv->current_action = act; }
+	Thread * check_current_action(ModelAction *curr);
 
 	bool take_step();
 
 	ModelAction * get_last_conflict(ModelAction *act);
 	void set_backtracking(ModelAction *act);
-	thread_id_t get_next_replay_thread();
+	Thread * get_next_thread(ModelAction *curr);
 	ModelAction * get_next_backtrack();
 	void reset_to_initial_state();
-	void resolve_promises(ModelAction *curr);
+	bool resolve_promises(ModelAction *curr);
 	void compute_promises(ModelAction *curr);
 
 	void add_action_to_lists(ModelAction *act);
 	ModelAction * get_last_action(thread_id_t tid);
-	ModelAction * get_parent_action(thread_id_t tid);
 	ModelAction * get_last_seq_cst(const void *location);
 	void build_reads_from_past(ModelAction *curr);
-	ModelAction * process_rmw(ModelAction * curr);
-	void post_r_modification_order(ModelAction * curr, const ModelAction *rf);
-	void r_modification_order(ModelAction * curr, const ModelAction *rf);
-	void w_modification_order(ModelAction * curr);
+	ModelAction * process_rmw(ModelAction *curr);
+	void post_r_modification_order(ModelAction *curr, const ModelAction *rf);
+	bool r_modification_order(ModelAction *curr, const ModelAction *rf);
+	bool w_modification_order(ModelAction *curr);
+	bool release_seq_head(const ModelAction *rf,
+	                std::vector<const ModelAction *> *release_heads) const;
+	bool resolve_release_sequences(void *location);
 
-	ModelAction *current_action;
 	ModelAction *diverge;
-	thread_id_t nextThread;
 
 	ucontext_t system_context;
 	action_list_t *action_trace;
@@ -117,15 +134,36 @@ private:
 	HashTable<const void *, action_list_t, uintptr_t, 4> *obj_map;
 
 	HashTable<void *, std::vector<action_list_t>, uintptr_t, 4 > *obj_thrd_map;
-	std::vector<Promise *> * promises;
+	std::vector<Promise *> *promises;
+
+	/**
+	 * Collection of lists of objects that might synchronize with one or
+	 * more release sequence. Release sequences might be determined lazily
+	 * as promises are fulfilled and modification orders are established.
+	 * This structure maps its lists by object location. Each ModelAction
+	 * in the lists should be an acquire operation.
+	 */
+	HashTable<void *, std::list<ModelAction *>, uintptr_t, 4> *lazy_sync_with_release;
+
+	/**
+	 * Represents the total size of the
+	 * ModelChecker::lazy_sync_with_release lists. This count should be
+	 * snapshotted, so it is actually a pointer to a location within
+	 * ModelChecker::priv
+	 */
+	unsigned int *lazy_sync_size;
+
 	std::vector<ModelAction *> *thrd_last_action;
 	NodeStack *node_stack;
-	ModelAction *next_backtrack;
+
+	/** Private data members that should be snapshotted. They are grouped
+	 * together for efficiency and maintainability. */
+	struct model_snapshot_members *priv;
 
 	/**
 	 * @brief The modification order graph
 	 *
-	 * A direceted acyclic graph recording observations of the modification
+	 * A directed acyclic graph recording observations of the modification
 	 * order on all the atomic objects in the system. This graph should
 	 * never contain any cycles, as that represents a violation of the
 	 * memory model (total ordering). This graph really consists of many
@@ -137,8 +175,8 @@ private:
 	 * <tt>b</tt>.
 	 */
 	CycleGraph *mo_graph;
-
 	bool failed_promise;
+	bool asserted;
 };
 
 extern ModelChecker *model;