1 /* -*- mode: C; c-basic-offset: 3; indent-tabs-mode: nil; -*- */
3 This file is part of drd, a thread error detector.
5 Copyright (C) 2006-2011 Bart Van Assche <bvanassche@acm.org>.
7 This program is free software; you can redistribute it and/or
8 modify it under the terms of the GNU General Public License as
9 published by the Free Software Foundation; either version 2 of the
10 License, or (at your option) any later version.
12 This program is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 The GNU General Public License is contained in the file COPYING.
30 /* Include directives. */
32 #include "drd_basics.h"
33 #include "drd_segment.h"
34 #include "pub_drd_bitmap.h"
35 #include "pub_tool_libcassert.h" /* tl_assert() */
36 #include "pub_tool_stacktrace.h" /* typedef StackTrace */
37 #include "pub_tool_threadstate.h" /* VG_N_THREADS */
42 /** Maximum number of threads DRD keeps information about. */
43 #define DRD_N_THREADS VG_N_THREADS
45 /** A number different from any valid DRD thread ID. */
46 #define DRD_INVALID_THREADID 0
49 * A number different from any valid POSIX thread ID.
51 * @note The PThreadId typedef and the INVALID_POSIX_THREADID depend on the
52 * operating system and threading library in use. PThreadId must contain at
53 * least as many bits as pthread_t, and INVALID_POSIX_THREADID
54 * must be a value that will never be returned by pthread_self().
56 #define INVALID_POSIX_THREADID ((PThreadId)0)
59 /* Type definitions. */
62 * POSIX thread ID. The type PThreadId must be at least as wide as
65 typedef UWord PThreadId;
67 /** Per-thread information managed by DRD. */
70 Segment* first; /**< Pointer to first segment. */
71 Segment* last; /**< Pointer to last segment. */
72 ThreadId vg_threadid; /**< Valgrind thread ID. */
73 PThreadId pt_threadid; /**< POSIX thread ID. */
74 Addr stack_min_min; /**< Lowest value stack pointer ever had. */
75 Addr stack_min; /**< Current stack pointer. */
76 Addr stack_startup; /**<Stack pointer after pthread_create() finished.*/
77 Addr stack_max; /**< Top of stack. */
78 SizeT stack_size; /**< Maximum size of stack. */
79 char name[64]; /**< User-assigned thread name. */
81 /** Indicates whether the Valgrind core knows about this thread. */
82 Bool vg_thread_exists;
83 /** Indicates whether there is an associated POSIX thread ID. */
84 Bool posix_thread_exists;
86 * If true, indicates that there is a corresponding POSIX thread ID and
87 * a corresponding OS thread that is detached.
89 Bool detached_posix_thread;
90 /** Wether recording of memory load accesses is currently enabled. */
91 Bool is_recording_loads;
92 /** Wether recording of memory load accesses is currently enabled. */
93 Bool is_recording_stores;
94 /** pthread_create() nesting level. */
95 Int pthread_create_nesting_level;
96 /** Nesting level of synchronization functions called by the client. */
102 * Local variables of drd_thread.c that are declared here such that these
103 * can be accessed by inline functions.
107 * DRD thread ID of the currently running thread. It is crucial for correct
108 * operation of DRD that this number is always in sync with
109 * VG_(get_running_tid)().
111 extern DrdThreadId DRD_(g_drd_running_tid);
112 /** Per-thread information managed by DRD. */
113 extern ThreadInfo DRD_(g_threadinfo)[DRD_N_THREADS];
114 /** Conflict set for the currently running thread. */
115 extern struct bitmap* DRD_(g_conflict_set);
118 /* Function declarations. */
120 void DRD_(thread_trace_context_switches)(const Bool t);
121 void DRD_(thread_trace_conflict_set)(const Bool t);
122 void DRD_(thread_trace_conflict_set_bm)(const Bool t);
123 Bool DRD_(thread_get_trace_fork_join)(void);
124 void DRD_(thread_set_trace_fork_join)(const Bool t);
125 void DRD_(thread_set_segment_merging)(const Bool m);
126 int DRD_(thread_get_segment_merge_interval)(void);
127 void DRD_(thread_set_segment_merge_interval)(const int i);
129 DrdThreadId DRD_(VgThreadIdToDrdThreadId)(const ThreadId tid);
130 DrdThreadId DRD_(NewVgThreadIdToDrdThreadId)(const ThreadId tid);
131 DrdThreadId DRD_(PtThreadIdToDrdThreadId)(const PThreadId tid);
132 ThreadId DRD_(DrdThreadIdToVgThreadId)(const DrdThreadId tid);
133 DrdThreadId DRD_(thread_pre_create)(const DrdThreadId creator,
134 const ThreadId vg_created);
135 DrdThreadId DRD_(thread_post_create)(const ThreadId vg_created);
136 void DRD_(thread_post_join)(DrdThreadId drd_joiner, DrdThreadId drd_joinee);
137 void DRD_(thread_delete)(const DrdThreadId tid, Bool detached);
138 void DRD_(thread_finished)(const DrdThreadId tid);
139 void DRD_(drd_thread_atfork_child)(const DrdThreadId tid);
140 void DRD_(thread_pre_cancel)(const DrdThreadId tid);
141 void DRD_(thread_set_stack_startup)(const DrdThreadId tid,
142 const Addr stack_startup);
143 Addr DRD_(thread_get_stack_min)(const DrdThreadId tid);
144 Addr DRD_(thread_get_stack_min_min)(const DrdThreadId tid);
145 Addr DRD_(thread_get_stack_max)(const DrdThreadId tid);
146 SizeT DRD_(thread_get_stack_size)(const DrdThreadId tid);
147 Bool DRD_(thread_get_on_alt_stack)(const DrdThreadId tid);
148 void DRD_(thread_set_on_alt_stack)(const DrdThreadId tid,
149 const Bool on_alt_stack);
150 Int DRD_(thread_get_threads_on_alt_stack)(void);
151 void DRD_(thread_set_pthreadid)(const DrdThreadId tid, const PThreadId ptid);
152 Bool DRD_(thread_get_joinable)(const DrdThreadId tid);
153 void DRD_(thread_set_joinable)(const DrdThreadId tid, const Bool joinable);
154 void DRD_(thread_entering_pthread_create)(const DrdThreadId tid);
155 void DRD_(thread_left_pthread_create)(const DrdThreadId tid);
156 const char* DRD_(thread_get_name)(const DrdThreadId tid);
157 void DRD_(thread_set_name)(const DrdThreadId tid, const char* const name);
158 void DRD_(thread_set_vg_running_tid)(const ThreadId vg_tid);
159 void DRD_(thread_set_running_tid)(const ThreadId vg_tid,
160 const DrdThreadId drd_tid);
161 int DRD_(thread_enter_synchr)(const DrdThreadId tid);
162 int DRD_(thread_leave_synchr)(const DrdThreadId tid);
163 int DRD_(thread_get_synchr_nesting_count)(const DrdThreadId tid);
164 void DRD_(thread_new_segment)(const DrdThreadId tid);
165 VectorClock* DRD_(thread_get_vc)(const DrdThreadId tid);
166 void DRD_(thread_get_latest_segment)(Segment** sg, const DrdThreadId tid);
167 void DRD_(thread_combine_vc_join)(const DrdThreadId joiner,
168 const DrdThreadId joinee);
169 void DRD_(thread_new_segment_and_combine_vc)(DrdThreadId tid,
171 void DRD_(thread_update_conflict_set)(const DrdThreadId tid,
172 const VectorClock* const old_vc);
174 void DRD_(thread_stop_using_mem)(const Addr a1, const Addr a2);
175 void DRD_(thread_set_record_loads)(const DrdThreadId tid, const Bool enabled);
176 void DRD_(thread_set_record_stores)(const DrdThreadId tid, const Bool enabled);
177 void DRD_(thread_print_all)(void);
178 void DRD_(thread_report_races)(const DrdThreadId tid);
179 void DRD_(thread_report_races_segment)(const DrdThreadId tid,
180 const Segment* const p);
181 void DRD_(thread_report_all_races)(void);
182 void DRD_(thread_report_conflicting_segments)(const DrdThreadId tid,
185 const BmAccessTypeT access_type);
186 ULong DRD_(thread_get_context_switch_count)(void);
187 ULong DRD_(thread_get_report_races_count)(void);
188 ULong DRD_(thread_get_discard_ordered_segments_count)(void);
189 ULong DRD_(thread_get_compute_conflict_set_count)(void);
190 ULong DRD_(thread_get_update_conflict_set_count)(void);
191 ULong DRD_(thread_get_update_conflict_set_new_sg_count)(void);
192 ULong DRD_(thread_get_update_conflict_set_sync_count)(void);
193 ULong DRD_(thread_get_update_conflict_set_join_count)(void);
194 ULong DRD_(thread_get_conflict_set_bitmap_creation_count)(void);
195 ULong DRD_(thread_get_conflict_set_bitmap2_creation_count)(void);
198 /* Inline function definitions. */
201 * Whether or not the specified DRD thread ID is valid.
203 * A DRD thread ID is valid if and only if the following conditions are met:
204 * - The ID is a valid index of the DRD_(g_threadinfo)[] array.
205 * - The ID is not equal to DRD_INVALID_THREADID.
206 * - The ID refers either to a thread known by the Valgrind core, a joinable
207 * thread that has not yet been joined or a detached thread.
210 Bool DRD_(IsValidDrdThreadId)(const DrdThreadId tid)
212 return (0 <= (int)tid && tid < DRD_N_THREADS && tid != DRD_INVALID_THREADID
213 && ! (DRD_(g_threadinfo)[tid].vg_thread_exists == False
214 && DRD_(g_threadinfo)[tid].posix_thread_exists == False
215 && DRD_(g_threadinfo)[tid].detached_posix_thread == False));
218 /** Returns the DRD thread ID of the currently running thread. */
220 DrdThreadId DRD_(thread_get_running_tid)(void)
222 #ifdef ENABLE_DRD_CONSISTENCY_CHECKS
223 tl_assert(DRD_(g_drd_running_tid) != DRD_INVALID_THREADID);
225 return DRD_(g_drd_running_tid);
228 /** Returns a pointer to the conflict set for the currently running thread. */
230 struct bitmap* DRD_(thread_get_conflict_set)(void)
232 return DRD_(g_conflict_set);
236 * Reports whether or not the currently running client thread is executing code
237 * inside the pthread_create() function.
240 Bool DRD_(running_thread_inside_pthread_create)(void)
242 return (DRD_(g_threadinfo)[DRD_(g_drd_running_tid)]
243 .pthread_create_nesting_level > 0);
247 * Reports whether or not recording of memory loads is enabled for the
248 * currently running client thread.
251 Bool DRD_(running_thread_is_recording_loads)(void)
253 #ifdef ENABLE_DRD_CONSISTENCY_CHECKS
254 tl_assert(0 <= (int)DRD_(g_drd_running_tid)
255 && DRD_(g_drd_running_tid) < DRD_N_THREADS
256 && DRD_(g_drd_running_tid) != DRD_INVALID_THREADID);
258 return (DRD_(g_threadinfo)[DRD_(g_drd_running_tid)].synchr_nesting == 0
259 && DRD_(g_threadinfo)[DRD_(g_drd_running_tid)].is_recording_loads);
263 * Reports whether or not recording memory stores is enabled for the
264 * currently running client thread.
267 Bool DRD_(running_thread_is_recording_stores)(void)
269 #ifdef ENABLE_DRD_CONSISTENCY_CHECKS
270 tl_assert(0 <= (int)DRD_(g_drd_running_tid)
271 && DRD_(g_drd_running_tid) < DRD_N_THREADS
272 && DRD_(g_drd_running_tid) != DRD_INVALID_THREADID);
274 return (DRD_(g_threadinfo)[DRD_(g_drd_running_tid)].synchr_nesting == 0
275 && DRD_(g_threadinfo)[DRD_(g_drd_running_tid)].is_recording_stores);
279 * Update the information about the lowest stack address that has ever been
280 * accessed by a thread.
283 void DRD_(thread_set_stack_min)(const DrdThreadId tid, const Addr stack_min)
285 #ifdef ENABLE_DRD_CONSISTENCY_CHECKS
286 tl_assert(0 <= (int)tid
287 && tid < DRD_N_THREADS
288 && tid != DRD_INVALID_THREADID);
290 DRD_(g_threadinfo)[tid].stack_min = stack_min;
291 #ifdef ENABLE_DRD_CONSISTENCY_CHECKS
292 /* This function can be called after the thread has been created but */
293 /* before drd_post_thread_create() has filled in stack_max. */
294 tl_assert(DRD_(g_threadinfo)[tid].stack_min
295 < DRD_(g_threadinfo)[tid].stack_max
296 || DRD_(g_threadinfo)[tid].stack_max == 0);
298 if (UNLIKELY(stack_min < DRD_(g_threadinfo)[tid].stack_min_min))
300 DRD_(g_threadinfo)[tid].stack_min_min = stack_min;
305 * Return true if and only if the specified address is on the stack of the
306 * currently scheduled thread.
309 Bool DRD_(thread_address_on_stack)(const Addr a)
311 return (DRD_(g_threadinfo)[DRD_(g_drd_running_tid)].stack_min <= a
312 && a < DRD_(g_threadinfo)[DRD_(g_drd_running_tid)].stack_max);
316 * Return true if and only if the specified address is on the stack of any
320 Bool DRD_(thread_address_on_any_stack)(const Addr a)
324 for (i = 1; i < DRD_N_THREADS; i++)
326 if (DRD_(g_threadinfo)[i].vg_thread_exists
327 && DRD_(g_threadinfo)[i].stack_min <= a
328 && a < DRD_(g_threadinfo)[i].stack_max)
336 /** Return a pointer to the latest segment for the specified thread. */
338 Segment* DRD_(thread_get_segment)(const DrdThreadId tid)
340 #ifdef ENABLE_DRD_CONSISTENCY_CHECKS
341 tl_assert(0 <= (int)tid && tid < DRD_N_THREADS
342 && tid != DRD_INVALID_THREADID);
343 tl_assert(DRD_(g_threadinfo)[tid].last);
345 return DRD_(g_threadinfo)[tid].last;
348 /** Return a pointer to the latest segment for the running thread. */
350 Segment* DRD_(running_thread_get_segment)(void)
352 return DRD_(thread_get_segment)(DRD_(g_drd_running_tid));
355 #endif /* __THREAD_H */