1 /** @file threads-model.h
2 * @brief Model Checker Thread class.
5 #ifndef __THREADS_MODEL_H__
6 #define __THREADS_MODEL_H__
11 #include "modeltypes.h"
12 #include "stl-model.h"
14 #include "classlist.h"
17 struct thread_params {
22 /** @brief Represents the state of a user Thread */
23 typedef enum thread_state {
24 /** Thread was just created and hasn't run yet */
26 /** Thread is running */
28 /** Thread is not currently running but is ready to run */
31 * Thread is waiting on another action (e.g., thread completion, lock
35 /** Thread has completed its execution */
40 /** @brief A Thread is created for each user-space thread */
43 Thread(thread_id_t tid);
44 Thread(thread_id_t tid, thrd_t *t, void (*func)(void *), void *a, Thread *parent);
45 Thread(thread_id_t tid, thrd_t *t, void *(*func)(void *), void *a, Thread *parent);
50 static int swap(ucontext_t *ctxt, Thread *t);
51 static int swap(Thread *t, ucontext_t *ctxt);
52 static int swap(Thread *t, Thread *t2);
54 thread_state get_state() const { return state; }
55 void set_state(thread_state s);
56 thread_id_t get_id() const;
57 thrd_t get_thrd_t() const { return *user_thread; }
58 Thread * get_parent() const { return parent; }
60 void set_creation(ModelAction *act) { creation = act; }
61 ModelAction * get_creation() const { return creation; }
64 * Set a return value for the last action in this thread (e.g., for an
66 * @param value The value to return
68 void set_return_value(uint64_t value) { last_action_val = value; }
71 * Retrieve a return value for the last action in this thread. Used,
72 * for instance, for an atomic read to return the 'read' value. Should
73 * be called from a user context.
74 * @return The value 'returned' by the action
76 uint64_t get_return_value() const { return last_action_val; }
78 /** @set and get the return value from pthread functions */
79 void set_pthread_return(void *ret) { pthread_return = ret; }
80 void * get_pthread_return() { return pthread_return; }
82 /** @return True if this thread is finished executing */
83 bool is_complete() const { return state == THREAD_COMPLETED; }
85 /** @return True if this thread is blocked */
86 bool is_blocked() const { return state == THREAD_BLOCKED; }
88 /** @return The pending (next) ModelAction for this Thread
89 * @see Thread::pending */
90 ModelAction * get_pending() const { return pending; }
92 /** @brief Set the pending (next) ModelAction for this Thread
93 * @param act The pending ModelAction
94 * @see Thread::pending */
95 void set_pending(ModelAction *act) { pending = act; }
97 bool just_woken_up() { return wakeup_state; }
98 void set_wakeup_state(bool state) { wakeup_state = state; }
100 Thread * waiting_on() const;
101 bool is_waiting_on(const Thread *t) const;
103 bool is_model_thread() const { return model_thread; }
105 friend void thread_startup();
107 friend void setup_context();
108 friend void * helper_thread(void *);
109 friend void finalize_helper_thread();
113 * Intentionally NOT allocated with MODELALLOC or SNAPSHOTALLOC.
114 * Threads should be allocated on the user's normal (snapshotting) heap
115 * to allow their allocation/deallocation to follow the same pattern as
116 * the rest of the backtracked/replayed program.
118 void * operator new(size_t size) {
119 return Thread_malloc(size);
121 void operator delete(void *p, size_t size) {
124 void * operator new[](size_t size) {
125 return Thread_malloc(size);
127 void operator delete[](void *p, size_t size) {
131 void setTLS(char *_tls) { tls = _tls;}
134 int create_context();
136 /** @brief The parent Thread which created this Thread */
137 Thread * const parent;
139 /** @brief The THREAD_CREATE ModelAction which created this Thread */
140 ModelAction *creation;
143 * @brief The next ModelAction to be run by this Thread
145 * This action should be kept updated by the ModelChecker, so that we
146 * always know what the next ModelAction's memory_order, action type,
149 ModelAction *pending;
151 /** @brief True if this thread was just woken up */
154 void (*start_routine)(void *);
155 void *(*pstart_routine)(void *);
164 ucontext_t helpercontext;
165 pthread_mutex_t mutex;
166 pthread_mutex_t mutex2;
175 * The value returned by the last action in this thread
176 * @see Thread::set_return_value()
177 * @see Thread::get_return_value()
179 uint64_t last_action_val;
181 /** the value return from pthread functions */
182 void * pthread_return;
184 /** @brief Is this Thread a special model-checker thread? */
185 const bool model_thread;
189 uintptr_t get_tls_addr();
190 void tlsdestructor(void *v);
193 Thread * thread_current();
194 void thread_startup();
195 void initMainThread();
197 static inline thread_id_t thrd_to_id(thrd_t t)
199 return t.priv->get_id();
203 * @brief Map a zero-based integer index to a unique thread ID
205 * This is the inverse of id_to_int
207 static inline thread_id_t int_to_id(int i)
213 * @brief Map a unique thread ID to a zero-based integer index
215 * This is the inverse of int_to_id
217 static inline int id_to_int(thread_id_t id)
222 int real_pthread_mutex_init(pthread_mutex_t *__mutex, const pthread_mutexattr_t *__mutexattr);
223 int real_pthread_mutex_lock (pthread_mutex_t *__mutex);
224 int real_pthread_mutex_unlock (pthread_mutex_t *__mutex);
225 int real_pthread_create (pthread_t *__restrict __newthread, const pthread_attr_t *__restrict __attr, void *(*__start_routine)(void *), void *__restrict __arg);
226 int real_pthread_join (pthread_t __th, void ** __thread_return);
227 void real_pthread_exit (void * value_ptr) __attribute__((noreturn));
228 void real_init_all();
230 #endif /* __THREADS_MODEL_H__ */