1 /*
2 This file is part of drd, a thread error detector.
3
4 Copyright (C) 2006-2013 Bart Van Assche <bvanassche@acm.org>.
5
6 This program is free software; you can redistribute it and/or
7 modify it under the terms of the GNU General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307, USA.
20
21 The GNU General Public License is contained in the file COPYING.
22 */
23
24
25 #ifndef __THREAD_H
26 #define __THREAD_H
27
28
29 /* Include directives. */
30
31 #include "drd_basics.h"
32 #include "drd_segment.h"
33 #include "pub_drd_bitmap.h"
34 #include "pub_tool_libcassert.h" /* tl_assert() */
35 #include "pub_tool_stacktrace.h" /* typedef StackTrace */
36 #include "pub_tool_threadstate.h" /* VG_N_THREADS */
37
38
39 /* Defines. */
40
41 /** Maximum number of threads DRD keeps information about. */
42 #define DRD_N_THREADS VG_N_THREADS
43
44 /** A number different from any valid DRD thread ID. */
45 #define DRD_INVALID_THREADID 0
46
47 /**
48 * A number different from any valid POSIX thread ID.
49 *
50 * @note The PThreadId typedef and the INVALID_POSIX_THREADID depend on the
51 * operating system and threading library in use. PThreadId must contain at
52 * least as many bits as pthread_t, and INVALID_POSIX_THREADID
53 * must be a value that will never be returned by pthread_self().
54 */
55 #define INVALID_POSIX_THREADID ((PThreadId)0)
56
57
58 /* Type definitions. */
59
60 /**
61 * POSIX thread ID. The type PThreadId must be at least as wide as
62 * pthread_t.
63 */
64 typedef UWord PThreadId;
65
66 /** Per-thread information managed by DRD. */
67 typedef struct
68 {
69 struct segment* sg_first;/**< Segment list. */
70 struct segment* sg_last;
71 ThreadId vg_threadid; /**< Valgrind thread ID. */
72 PThreadId pt_threadid; /**< POSIX thread ID. */
73 Addr stack_min_min; /**< Lowest value stack pointer ever had. */
74 Addr stack_min; /**< Current stack pointer. */
75 Addr stack_startup; /**<Stack pointer after pthread_create() finished.*/
76 Addr stack_max; /**< Top of stack. */
77 SizeT stack_size; /**< Maximum size of stack. */
78 HChar name[64]; /**< User-assigned thread name. */
79 Bool on_alt_stack;
80 /** Whether this structure contains valid information. */
81 Bool valid;
82 /** Indicates whether the Valgrind core knows about this thread. */
83 Bool vg_thread_exists;
84 /** Indicates whether there is an associated POSIX thread ID. */
85 Bool posix_thread_exists;
86 /**
87 * If true, indicates that there is a corresponding POSIX thread ID and
88 * a corresponding OS thread that is detached.
89 */
90 Bool detached_posix_thread;
91 /** Wether recording of memory load accesses is currently enabled. */
92 Bool is_recording_loads;
93 /** Wether recording of memory load accesses is currently enabled. */
94 Bool is_recording_stores;
95 /** pthread_create() nesting level. */
96 Int pthread_create_nesting_level;
97 /** Nesting level of synchronization functions called by the client. */
98 Int synchr_nesting;
99 /** Delayed thread deletion sequence number. */
100 unsigned deletion_seq;
101 } ThreadInfo;
102
103
104 /*
105 * Local variables of drd_thread.c that are declared here such that these
106 * can be accessed by inline functions.
107 */
108
109 /**
110 * DRD thread ID of the currently running thread. It is crucial for correct
111 * operation of DRD that this number is always in sync with
112 * VG_(get_running_tid)().
113 */
114 extern DrdThreadId DRD_(g_drd_running_tid);
115 /** Per-thread information managed by DRD. */
116 extern ThreadInfo DRD_(g_threadinfo)[DRD_N_THREADS];
117 /** Conflict set for the currently running thread. */
118 extern struct bitmap* DRD_(g_conflict_set);
119
120
121 /* Function declarations. */
122
123 void DRD_(thread_trace_context_switches)(const Bool t);
124 void DRD_(thread_trace_conflict_set)(const Bool t);
125 void DRD_(thread_trace_conflict_set_bm)(const Bool t);
126 Bool DRD_(thread_get_trace_fork_join)(void);
127 void DRD_(thread_set_trace_fork_join)(const Bool t);
128 void DRD_(thread_set_segment_merging)(const Bool m);
129 int DRD_(thread_get_segment_merge_interval)(void);
130 void DRD_(thread_set_segment_merge_interval)(const int i);
131 void DRD_(thread_set_join_list_vol)(const int jlv);
132
133 void DRD_(thread_init)(void);
134 DrdThreadId DRD_(VgThreadIdToDrdThreadId)(const ThreadId tid);
135 DrdThreadId DRD_(NewVgThreadIdToDrdThreadId)(const ThreadId tid);
136 DrdThreadId DRD_(PtThreadIdToDrdThreadId)(const PThreadId tid);
137 ThreadId DRD_(DrdThreadIdToVgThreadId)(const DrdThreadId tid);
138 DrdThreadId DRD_(thread_pre_create)(const DrdThreadId creator,
139 const ThreadId vg_created);
140 DrdThreadId DRD_(thread_post_create)(const ThreadId vg_created);
141 void DRD_(thread_post_join)(DrdThreadId drd_joiner, DrdThreadId drd_joinee);
142 void DRD_(thread_delete)(const DrdThreadId tid, Bool detached);
143 void DRD_(thread_finished)(const DrdThreadId tid);
144 void DRD_(drd_thread_atfork_child)(const DrdThreadId tid);
145 void DRD_(thread_pre_cancel)(const DrdThreadId tid);
146 void DRD_(thread_set_stack_startup)(const DrdThreadId tid,
147 const Addr stack_startup);
148 Addr DRD_(thread_get_stack_min)(const DrdThreadId tid);
149 Addr DRD_(thread_get_stack_min_min)(const DrdThreadId tid);
150 Addr DRD_(thread_get_stack_max)(const DrdThreadId tid);
151 SizeT DRD_(thread_get_stack_size)(const DrdThreadId tid);
152 Bool DRD_(thread_get_on_alt_stack)(const DrdThreadId tid);
153 void DRD_(thread_set_on_alt_stack)(const DrdThreadId tid,
154 const Bool on_alt_stack);
155 Int DRD_(thread_get_threads_on_alt_stack)(void);
156 void DRD_(thread_set_pthreadid)(const DrdThreadId tid, const PThreadId ptid);
157 Bool DRD_(thread_get_joinable)(const DrdThreadId tid);
158 void DRD_(thread_set_joinable)(const DrdThreadId tid, const Bool joinable);
159 void DRD_(thread_entering_pthread_create)(const DrdThreadId tid);
160 void DRD_(thread_left_pthread_create)(const DrdThreadId tid);
161 const HChar* DRD_(thread_get_name)(const DrdThreadId tid);
162 void DRD_(thread_set_name)(const DrdThreadId tid, const HChar* const name);
163 void DRD_(thread_set_vg_running_tid)(const ThreadId vg_tid);
164 void DRD_(thread_set_running_tid)(const ThreadId vg_tid,
165 const DrdThreadId drd_tid);
166 int DRD_(thread_enter_synchr)(const DrdThreadId tid);
167 int DRD_(thread_leave_synchr)(const DrdThreadId tid);
168 int DRD_(thread_get_synchr_nesting_count)(const DrdThreadId tid);
169 void DRD_(thread_new_segment)(const DrdThreadId tid);
170 VectorClock* DRD_(thread_get_vc)(const DrdThreadId tid);
171 void DRD_(thread_get_latest_segment)(Segment** sg, const DrdThreadId tid);
172 void DRD_(thread_combine_vc_join)(const DrdThreadId joiner,
173 const DrdThreadId joinee);
174 void DRD_(thread_new_segment_and_combine_vc)(DrdThreadId tid,
175 const Segment* sg);
176 void DRD_(thread_update_conflict_set)(const DrdThreadId tid,
177 const VectorClock* const old_vc);
178
179 void DRD_(thread_stop_using_mem)(const Addr a1, const Addr a2);
180 void DRD_(thread_set_record_loads)(const DrdThreadId tid, const Bool enabled);
181 void DRD_(thread_set_record_stores)(const DrdThreadId tid, const Bool enabled);
182 void DRD_(thread_print_all)(void);
183 void DRD_(thread_report_races)(const DrdThreadId tid);
184 void DRD_(thread_report_races_segment)(const DrdThreadId tid,
185 const Segment* const p);
186 void DRD_(thread_report_all_races)(void);
187 void DRD_(thread_report_conflicting_segments)(const DrdThreadId tid,
188 const Addr addr,
189 const SizeT size,
190 const BmAccessTypeT access_type);
191 ULong DRD_(thread_get_context_switch_count)(void);
192 ULong DRD_(thread_get_report_races_count)(void);
193 ULong DRD_(thread_get_discard_ordered_segments_count)(void);
194 ULong DRD_(thread_get_compute_conflict_set_count)(void);
195 ULong DRD_(thread_get_update_conflict_set_count)(void);
196 ULong DRD_(thread_get_update_conflict_set_new_sg_count)(void);
197 ULong DRD_(thread_get_update_conflict_set_sync_count)(void);
198 ULong DRD_(thread_get_update_conflict_set_join_count)(void);
199 ULong DRD_(thread_get_conflict_set_bitmap_creation_count)(void);
200 ULong DRD_(thread_get_conflict_set_bitmap2_creation_count)(void);
201
202
203 /* Inline function definitions. */
204
205 /**
206 * Whether or not the specified DRD thread ID is valid.
207 *
208 * A DRD thread ID is valid if and only if the following conditions are met:
209 * - The ID is a valid index of the DRD_(g_threadinfo)[] array.
210 * - The ID is not equal to DRD_INVALID_THREADID.
211 * - The ID refers either to a thread known by the Valgrind core, a joinable
212 * thread that has not yet been joined or a detached thread.
213 */
214 static __inline__
DRD_(IsValidDrdThreadId)215 Bool DRD_(IsValidDrdThreadId)(const DrdThreadId tid)
216 {
217 return (0 <= (int)tid && tid < DRD_N_THREADS && tid != DRD_INVALID_THREADID
218 && (DRD_(g_threadinfo)[tid].valid));
219 }
220
221 /** Returns the DRD thread ID of the currently running thread. */
222 static __inline__
DRD_(thread_get_running_tid)223 DrdThreadId DRD_(thread_get_running_tid)(void)
224 {
225 #ifdef ENABLE_DRD_CONSISTENCY_CHECKS
226 tl_assert(DRD_(g_drd_running_tid) != DRD_INVALID_THREADID);
227 #endif
228 return DRD_(g_drd_running_tid);
229 }
230
231 /** Returns a pointer to the conflict set for the currently running thread. */
232 static __inline__
DRD_(thread_get_conflict_set)233 struct bitmap* DRD_(thread_get_conflict_set)(void)
234 {
235 return DRD_(g_conflict_set);
236 }
237
238 /**
239 * Reports whether or not the currently running client thread is executing code
240 * inside the pthread_create() function.
241 */
242 static __inline__
DRD_(running_thread_inside_pthread_create)243 Bool DRD_(running_thread_inside_pthread_create)(void)
244 {
245 return (DRD_(g_threadinfo)[DRD_(g_drd_running_tid)]
246 .pthread_create_nesting_level > 0);
247 }
248
249 /**
250 * Reports whether or not recording of memory loads is enabled for the
251 * currently running client thread.
252 */
253 static __inline__
DRD_(running_thread_is_recording_loads)254 Bool DRD_(running_thread_is_recording_loads)(void)
255 {
256 #ifdef ENABLE_DRD_CONSISTENCY_CHECKS
257 tl_assert(0 <= (int)DRD_(g_drd_running_tid)
258 && DRD_(g_drd_running_tid) < DRD_N_THREADS
259 && DRD_(g_drd_running_tid) != DRD_INVALID_THREADID);
260 #endif
261 return (DRD_(g_threadinfo)[DRD_(g_drd_running_tid)].synchr_nesting == 0
262 && DRD_(g_threadinfo)[DRD_(g_drd_running_tid)].is_recording_loads);
263 }
264
265 /**
266 * Reports whether or not recording memory stores is enabled for the
267 * currently running client thread.
268 */
269 static __inline__
DRD_(running_thread_is_recording_stores)270 Bool DRD_(running_thread_is_recording_stores)(void)
271 {
272 #ifdef ENABLE_DRD_CONSISTENCY_CHECKS
273 tl_assert(0 <= (int)DRD_(g_drd_running_tid)
274 && DRD_(g_drd_running_tid) < DRD_N_THREADS
275 && DRD_(g_drd_running_tid) != DRD_INVALID_THREADID);
276 #endif
277 return (DRD_(g_threadinfo)[DRD_(g_drd_running_tid)].synchr_nesting == 0
278 && DRD_(g_threadinfo)[DRD_(g_drd_running_tid)].is_recording_stores);
279 }
280
281 /**
282 * Update the information about the lowest stack address that has ever been
283 * accessed by a thread.
284 */
285 static __inline__
DRD_(thread_set_stack_min)286 void DRD_(thread_set_stack_min)(const DrdThreadId tid, const Addr stack_min)
287 {
288 #ifdef ENABLE_DRD_CONSISTENCY_CHECKS
289 tl_assert(0 <= (int)tid
290 && tid < DRD_N_THREADS
291 && tid != DRD_INVALID_THREADID);
292 #endif
293 DRD_(g_threadinfo)[tid].stack_min = stack_min;
294 #ifdef ENABLE_DRD_CONSISTENCY_CHECKS
295 /* This function can be called after the thread has been created but */
296 /* before drd_post_thread_create() has filled in stack_max. */
297 tl_assert(DRD_(g_threadinfo)[tid].stack_min
298 <= DRD_(g_threadinfo)[tid].stack_max
299 || DRD_(g_threadinfo)[tid].stack_max == 0);
300 #endif
301 if (UNLIKELY(stack_min < DRD_(g_threadinfo)[tid].stack_min_min))
302 {
303 DRD_(g_threadinfo)[tid].stack_min_min = stack_min;
304 }
305 }
306
307 /**
308 * Return true if and only if the specified address is on the stack of the
309 * currently scheduled thread.
310 */
311 static __inline__
DRD_(thread_address_on_stack)312 Bool DRD_(thread_address_on_stack)(const Addr a)
313 {
314 return (DRD_(g_threadinfo)[DRD_(g_drd_running_tid)].stack_min <= a
315 && a < DRD_(g_threadinfo)[DRD_(g_drd_running_tid)].stack_max);
316 }
317
318 /**
319 * Return true if and only if the specified address is on the stack of any
320 * thread.
321 */
322 static __inline__
DRD_(thread_address_on_any_stack)323 Bool DRD_(thread_address_on_any_stack)(const Addr a)
324 {
325 int i;
326
327 for (i = 1; i < DRD_N_THREADS; i++)
328 {
329 if (DRD_(g_threadinfo)[i].vg_thread_exists
330 && DRD_(g_threadinfo)[i].stack_min <= a
331 && a < DRD_(g_threadinfo)[i].stack_max)
332 {
333 return True;
334 }
335 }
336 return False;
337 }
338
339 /** Return a pointer to the latest segment for the specified thread. */
340 static __inline__
DRD_(thread_get_segment)341 Segment* DRD_(thread_get_segment)(const DrdThreadId tid)
342 {
343 #ifdef ENABLE_DRD_CONSISTENCY_CHECKS
344 tl_assert(0 <= (int)tid && tid < DRD_N_THREADS
345 && tid != DRD_INVALID_THREADID);
346 tl_assert(DRD_(g_threadinfo)[tid].sg_last);
347 #endif
348 return DRD_(g_threadinfo)[tid].sg_last;
349 }
350
351 /** Return a pointer to the latest segment for the running thread. */
352 static __inline__
DRD_(running_thread_get_segment)353 Segment* DRD_(running_thread_get_segment)(void)
354 {
355 return DRD_(thread_get_segment)(DRD_(g_drd_running_tid));
356 }
357
358 #endif /* __THREAD_H */
359