2 * @brief Models actions taken by threads.
13 #include "memoryorder.h"
14 #include "modeltypes.h"
19 using std::memory_order;
20 using std::memory_order_relaxed;
21 using std::memory_order_acquire;
22 using std::memory_order_release;
23 using std::memory_order_acq_rel;
24 using std::memory_order_seq_cst;
26 /** Note that this value can be legitimately used by a program, and
27 * hence by iteself does not indicate no value. */
28 #define VALUE_NONE 0xdeadbeef
30 /** A special value to represent a successful trylock */
31 #define VALUE_TRYSUCCESS 1
33 /** A special value to represent a failed trylock */
34 #define VALUE_TRYFAILED 0
36 /** @brief Represents an action type, identifying one of several types of
38 typedef enum action_type {
39 MODEL_FIXUP_RELSEQ, /**< Special ModelAction: finalize a release
41 THREAD_CREATE, /**< A thread creation action */
42 THREAD_START, /**< First action in each thread */
43 THREAD_YIELD, /**< A thread yield action */
44 THREAD_JOIN, /**< A thread join action */
45 THREAD_FINISH, /**< A thread completion action */
46 ATOMIC_UNINIT, /**< Represents an uninitialized atomic */
47 ATOMIC_READ, /**< An atomic read action */
48 ATOMIC_WRITE, /**< An atomic write action */
49 ATOMIC_RMWR, /**< The read part of an atomic RMW action */
50 ATOMIC_RMW, /**< The write part of an atomic RMW action */
51 ATOMIC_RMWC, /**< Convert an atomic RMW action into a READ */
52 ATOMIC_INIT, /**< Initialization of an atomic object (e.g.,
54 ATOMIC_FENCE, /**< A fence action */
55 ATOMIC_LOCK, /**< A lock action */
56 ATOMIC_TRYLOCK, /**< A trylock action */
57 ATOMIC_UNLOCK, /**< An unlock action */
58 ATOMIC_NOTIFY_ONE, /**< A notify_one action */
59 ATOMIC_NOTIFY_ALL, /**< A notify all action */
60 ATOMIC_WAIT /**< A wait action */
63 /* Forward declaration */
68 * The ModelAction class encapsulates an atomic action.
72 ModelAction(action_type_t type, memory_order order, void *loc, uint64_t value = VALUE_NONE, Thread *thread = NULL);
76 thread_id_t get_tid() const { return tid; }
77 action_type get_type() const { return type; }
78 memory_order get_mo() const { return order; }
79 void * get_location() const { return location; }
80 modelclock_t get_seq_number() const { return seq_number; }
81 uint64_t get_value() const { return value; }
82 const ModelAction * get_reads_from() const { return reads_from; }
84 Node * get_node() const;
85 void set_node(Node *n) { node = n; }
87 void set_read_from(const ModelAction *act);
89 /** Store the most recent fence-release from the same thread
90 * @param fence The fence-release that occured prior to this */
91 void set_last_fence_release(const ModelAction *fence) { last_fence_release = fence; }
92 /** @return The most recent fence-release from the same thread */
93 const ModelAction * get_last_fence_release() const { return last_fence_release; }
95 void copy_from_new(ModelAction *newaction);
96 void set_seq_number(modelclock_t num);
97 void set_try_lock(bool obtainedlock);
98 bool is_thread_start() const;
99 bool is_relseq_fixup() const;
100 bool is_mutex_op() const;
101 bool is_lock() const;
102 bool is_trylock() const;
103 bool is_unlock() const;
104 bool is_wait() const;
105 bool is_notify() const;
106 bool is_notify_one() const;
107 bool is_success_lock() const;
108 bool is_failed_trylock() const;
109 bool is_atomic_var() const;
110 bool is_uninitialized() const;
111 bool is_read() const;
112 bool is_write() const;
113 bool could_be_write() const;
114 bool is_rmwr() const;
115 bool is_rmwc() const;
117 bool is_fence() const;
118 bool is_initialization() const;
119 bool is_relaxed() const;
120 bool is_acquire() const;
121 bool is_release() const;
122 bool is_seqcst() const;
123 bool same_var(const ModelAction *act) const;
124 bool same_thread(const ModelAction *act) const;
125 bool is_conflicting_lock(const ModelAction *act) const;
126 bool could_synchronize_with(const ModelAction *act) const;
128 Thread * get_thread_operand() const;
130 void create_cv(const ModelAction *parent = NULL);
131 ClockVector * get_cv() const { return cv; }
132 bool synchronize_with(const ModelAction *act);
134 bool has_synchronized_with(const ModelAction *act) const;
135 bool happens_before(const ModelAction *act) const;
137 inline bool operator <(const ModelAction& act) const {
138 return get_seq_number() < act.get_seq_number();
140 inline bool operator >(const ModelAction& act) const {
141 return get_seq_number() > act.get_seq_number();
144 void process_rmw(ModelAction * act);
145 void copy_typeandorder(ModelAction * act);
147 void set_sleep_flag() { sleep_flag=true; }
148 bool get_sleep_flag() { return sleep_flag; }
149 unsigned int hash() const;
154 /** Type of action (read, write, thread create, thread yield, thread join) */
157 /** The memory order for this operation. */
160 /** A pointer to the memory location for this action. */
163 /** The thread id that performed this action. */
166 /** The value written (for write or RMW; undefined for read) */
169 /** The action that this action reads from. Only valid for reads */
170 const ModelAction *reads_from;
172 /** The last fence release from the same thread */
173 const ModelAction *last_fence_release;
175 /** A back reference to a Node in NodeStack, if this ModelAction is
176 * saved on the NodeStack. */
179 modelclock_t seq_number;
181 /** The clock vector stored with this action; only needed if this
182 * action is a store release? */
188 typedef std::list< ModelAction *, SnapshotAlloc<ModelAction *> > action_list_t;
190 #endif /* __ACTION_H__ */