+/** @file threads.h
+ * @brief Model Checker Thread class.
+ */
+
#ifndef __THREADS_H__
#define __THREADS_H__
#include <ucontext.h>
+#include <stdint.h>
+
#include "mymemory.h"
#include "libthreads.h"
#define THREAD_ID_T_NONE -1
+/** @brief Represents the state of a user Thread */
typedef enum thread_state {
+ /** Thread was just created and hasn't run yet */
THREAD_CREATED,
+ /** Thread is running */
THREAD_RUNNING,
+ /**
+ * Thread has yielded to the model-checker but is ready to run. Used
+ * during an action that caused a context switch to the model-checking
+ * context.
+ */
THREAD_READY,
+ /** Thread has completed its execution */
THREAD_COMPLETED
} thread_state;
+class ModelAction;
+
+/** @brief A Thread is created for each user-space thread */
class Thread {
public:
Thread(thrd_t *t, void (*func)(void *), void *a);
thrd_t get_thrd_t() { return *user_thread; }
Thread * get_parent() { return parent; }
+ void set_creation(ModelAction *act) { creation = act; }
+ ModelAction * get_creation() { return creation; }
+
+ /**
+ * Set a return value for the last action in this thread (e.g., for an
+ * atomic read).
+ * @param value The value to return
+ */
+ void set_return_value(uint64_t value) { last_action_val = value; }
+
+ /**
+ * Retrieve a return value for the last action in this thread. Used,
+ * for instance, for an atomic read to return the 'read' value. Should
+ * be called from a user context.
+ * @return The value 'returned' by the action
+ */
+ uint64_t get_return_value() { return last_action_val; }
+
friend void thread_startup();
- MEMALLOC
+ SNAPSHOTALLOC
private:
int create_context();
Thread *parent;
+ ModelAction *creation;
void (*start_routine)(void *);
void *arg;
thrd_t *user_thread;
thread_id_t id;
thread_state state;
+
+ /**
+ * The value returned by the last action in this thread
+ * @see Thread::set_return_value()
+ * @see Thread::get_return_value()
+ */
+ uint64_t last_action_val;
};
Thread * thread_current();