2 * @brief Models actions taken by threads.
12 #include "memoryorder.h"
13 #include "modeltypes.h"
23 using std::memory_order;
24 using std::memory_order_relaxed;
25 using std::memory_order_acquire;
26 using std::memory_order_release;
27 using std::memory_order_acq_rel;
28 using std::memory_order_seq_cst;
30 /** Note that this value can be legitimately used by a program, and
31 * hence by iteself does not indicate no value. */
32 #define VALUE_NONE 0xdeadbeef
34 /** A special value to represent a successful trylock */
35 #define VALUE_TRYSUCCESS 1
37 /** A special value to represent a failed trylock */
38 #define VALUE_TRYFAILED 0
40 /** @brief Represents an action type, identifying one of several types of
42 typedef enum action_type {
43 MODEL_FIXUP_RELSEQ, /**< Special ModelAction: finalize a release
45 THREAD_CREATE, /**< A thread creation action */
46 THREAD_START, /**< First action in each thread */
47 THREAD_YIELD, /**< A thread yield action */
48 THREAD_JOIN, /**< A thread join action */
49 THREAD_FINISH, /**< A thread completion action */
50 ATOMIC_UNINIT, /**< Represents an uninitialized atomic */
51 ATOMIC_READ, /**< An atomic read action */
52 ATOMIC_WRITE, /**< An atomic write action */
53 ATOMIC_RMWR, /**< The read part of an atomic RMW action */
54 ATOMIC_RMW, /**< The write part of an atomic RMW action */
55 ATOMIC_RMWC, /**< Convert an atomic RMW action into a READ */
56 ATOMIC_INIT, /**< Initialization of an atomic object (e.g.,
58 ATOMIC_FENCE, /**< A fence action */
59 ATOMIC_LOCK, /**< A lock action */
60 ATOMIC_TRYLOCK, /**< A trylock action */
61 ATOMIC_UNLOCK, /**< An unlock action */
62 ATOMIC_NOTIFY_ONE, /**< A notify_one action */
63 ATOMIC_NOTIFY_ALL, /**< A notify all action */
64 ATOMIC_WAIT /**< A wait action */
67 /* Forward declaration */
72 * The ModelAction class encapsulates an atomic action.
76 ModelAction(action_type_t type, memory_order order, void *loc, uint64_t value = VALUE_NONE, Thread *thread = NULL);
80 thread_id_t get_tid() const { return tid; }
81 action_type get_type() const { return type; }
82 memory_order get_mo() const { return order; }
83 void * get_location() const { return location; }
84 modelclock_t get_seq_number() const { return seq_number; }
85 uint64_t get_value() const { return value; }
86 uint64_t get_reads_from_value() const;
87 uint64_t get_write_value() const;
88 uint64_t get_return_value() const;
89 const ModelAction * get_reads_from() const { return reads_from; }
90 Promise * get_reads_from_promise() const { return reads_from_promise; }
91 std::mutex * get_mutex() const;
93 Node * get_node() const;
94 void set_node(Node *n) { node = n; }
96 void set_read_from(const ModelAction *act);
97 void set_read_from_promise(Promise *promise);
99 /** Store the most recent fence-release from the same thread
100 * @param fence The fence-release that occured prior to this */
101 void set_last_fence_release(const ModelAction *fence) { last_fence_release = fence; }
102 /** @return The most recent fence-release from the same thread */
103 const ModelAction * get_last_fence_release() const { return last_fence_release; }
105 void copy_from_new(ModelAction *newaction);
106 void set_seq_number(modelclock_t num);
107 void set_try_lock(bool obtainedlock);
108 bool is_thread_start() const;
109 bool is_relseq_fixup() const;
110 bool is_mutex_op() const;
111 bool is_lock() const;
112 bool is_trylock() const;
113 bool is_unlock() const;
114 bool is_wait() const;
115 bool is_notify() const;
116 bool is_notify_one() const;
117 bool is_success_lock() const;
118 bool is_failed_trylock() const;
119 bool is_atomic_var() const;
120 bool is_uninitialized() const;
121 bool is_read() const;
122 bool is_write() const;
123 bool is_yield() const;
124 bool could_be_write() const;
125 bool is_rmwr() const;
126 bool is_rmwc() const;
128 bool is_fence() const;
129 bool is_initialization() const;
130 bool is_relaxed() const;
131 bool is_acquire() const;
132 bool is_release() const;
133 bool is_seqcst() const;
134 bool same_var(const ModelAction *act) const;
135 bool same_thread(const ModelAction *act) const;
136 bool is_conflicting_lock(const ModelAction *act) const;
137 bool could_synchronize_with(const ModelAction *act) const;
139 Thread * get_thread_operand() const;
141 void create_cv(const ModelAction *parent = NULL);
142 ClockVector * get_cv() const { return cv; }
143 bool synchronize_with(const ModelAction *act);
145 bool has_synchronized_with(const ModelAction *act) const;
146 bool happens_before(const ModelAction *act) const;
148 inline bool operator <(const ModelAction& act) const {
149 return get_seq_number() < act.get_seq_number();
151 inline bool operator >(const ModelAction& act) const {
152 return get_seq_number() > act.get_seq_number();
155 void process_rmw(ModelAction * act);
156 void copy_typeandorder(ModelAction * act);
158 void set_sleep_flag() { sleep_flag=true; }
159 bool get_sleep_flag() { return sleep_flag; }
160 unsigned int hash() const;
162 bool equals(const ModelAction *x) const { return this == x; }
163 bool equals(const Promise *x) const { return false; }
165 bool may_read_from(const ModelAction *write) const;
166 bool may_read_from(const Promise *promise) const;
170 /** Type of action (read, write, thread create, thread yield, thread join) */
173 /** The memory order for this operation. */
176 /** A pointer to the memory location for this action. */
179 /** The thread id that performed this action. */
182 /** The value written (for write or RMW; undefined for read) */
185 /** The action that this action reads from. Only valid for reads */
186 const ModelAction *reads_from;
188 /** The promise that this action reads from. Only valid for reads */
189 Promise *reads_from_promise;
191 /** The last fence release from the same thread */
192 const ModelAction *last_fence_release;
194 /** A back reference to a Node in NodeStack, if this ModelAction is
195 * saved on the NodeStack. */
198 modelclock_t seq_number;
200 /** The clock vector stored with this action; only needed if this
201 * action is a store release? */
207 #endif /* __ACTION_H__ */