#ifndef __THREADS_MODEL_H__
#define __THREADS_MODEL_H__
-#include <ucontext.h>
#include <stdint.h>
-#include <vector>
#include "mymemory.h"
-#include "libthreads.h"
+#include <threads.h>
#include "modeltypes.h"
+#include "stl-model.h"
+#include "context.h"
+
+struct thread_params {
+ thrd_start_t func;
+ void *arg;
+};
/** @brief Represents the state of a user Thread */
typedef enum thread_state {
class Thread {
public:
Thread(thread_id_t tid);
- Thread(thrd_t *t, void (*func)(void *), void *a);
+ Thread(thread_id_t tid, thrd_t *t, void (*func)(void *), void *a, Thread *parent);
~Thread();
void complete();
static int swap(ucontext_t *ctxt, Thread *t);
static int swap(Thread *t, ucontext_t *ctxt);
- thread_state get_state() { return state; }
- void set_state(thread_state s) { state = s; }
- thread_id_t get_id();
- thrd_t get_thrd_t() { return *user_thread; }
- Thread * get_parent() { return parent; }
+ thread_state get_state() const { return state; }
+ void set_state(thread_state s);
+ thread_id_t get_id() const;
+ thrd_t get_thrd_t() const { return *user_thread; }
+ Thread * get_parent() const { return parent; }
void set_creation(ModelAction *act) { creation = act; }
- ModelAction * get_creation() { return creation; }
+ ModelAction * get_creation() const { return creation; }
/**
* Set a return value for the last action in this thread (e.g., for an
* be called from a user context.
* @return The value 'returned' by the action
*/
- uint64_t get_return_value() { return last_action_val; }
+ uint64_t get_return_value() const { return last_action_val; }
/** @return True if this thread is finished executing */
- bool is_complete() { return state == THREAD_COMPLETED; }
+ bool is_complete() const { return state == THREAD_COMPLETED; }
/** @return True if this thread is blocked */
- bool is_blocked() { return state == THREAD_BLOCKED; }
-
- /** @return True if no threads are waiting on this Thread */
- bool wait_list_empty() { return wait_list.empty(); }
-
- /**
- * Add a ModelAction to the waiting list for this thread.
- * @param t The ModelAction to add. Must be a JOIN.
- */
- void push_wait_list(ModelAction *act) { wait_list.push_back(act); }
+ bool is_blocked() const { return state == THREAD_BLOCKED; }
- unsigned int num_wait_list() {
- return wait_list.size();
- }
-
- ModelAction * get_waiter(unsigned int i) {
- return wait_list[i];
- }
+ /** @return The pending (next) ModelAction for this Thread
+ * @see Thread::pending */
+ ModelAction * get_pending() const { return pending; }
- ModelAction * get_pending() { return pending; }
+ /** @brief Set the pending (next) ModelAction for this Thread
+ * @param act The pending ModelAction
+ * @see Thread::pending */
void set_pending(ModelAction *act) { pending = act; }
- /**
- * Remove one ModelAction from the waiting list
- * @return The ModelAction that was removed from the waiting list
- */
- ModelAction * pop_wait_list() {
- ModelAction *ret = wait_list.front();
- wait_list.pop_back();
- return ret;
- }
- bool is_model_thread() { return model_thread; }
+ Thread * waiting_on() const;
+ bool is_waiting_on(const Thread *t) const;
+
+ bool is_model_thread() const { return model_thread; }
friend void thread_startup();
* to allow their allocation/deallocation to follow the same pattern as
* the rest of the backtracked/replayed program.
*/
+ void * operator new(size_t size) {
+ return Thread_malloc(size);
+ }
+ void operator delete(void *p, size_t size) {
+ Thread_free(p);
+ }
+ void * operator new[](size_t size) {
+ return Thread_malloc(size);
+ }
+ void operator delete[](void *p, size_t size) {
+ Thread_free(p);
+ }
private:
int create_context();
- Thread *parent;
+
+ /** @brief The parent Thread which created this Thread */
+ Thread * const parent;
+
+ /** @brief The THREAD_CREATE ModelAction which created this Thread */
ModelAction *creation;
+ /**
+ * @brief The next ModelAction to be run by this Thread
+ *
+ * This action should be kept updated by the ModelChecker, so that we
+ * always know what the next ModelAction's memory_order, action type,
+ * and location are.
+ */
ModelAction *pending;
+
void (*start_routine)(void *);
void *arg;
ucontext_t context;
thread_id_t id;
thread_state state;
- /**
- * A list of ModelActions waiting on this Thread. Particularly, this
- * list is used for thread joins, where another Thread waits for this
- * Thread to complete
- */
- std::vector< ModelAction *, SnapshotAlloc<ModelAction *> > wait_list;
-
/**
* The value returned by the last action in this thread
* @see Thread::set_return_value()
static inline thread_id_t thrd_to_id(thrd_t t)
{
- return t;
+ return t.priv->get_id();
}
+/**
+ * @brief Map a zero-based integer index to a unique thread ID
+ *
+ * This is the inverse of id_to_int
+ */
static inline thread_id_t int_to_id(int i)
{
return i;
}
+/**
+ * @brief Map a unique thread ID to a zero-based integer index
+ *
+ * This is the inverse of int_to_id
+ */
static inline int id_to_int(thread_id_t id)
{
return id;