1
2 /*--------------------------------------------------------------------*/
3 /*--- The thread state. m_threadstate.c ---*/
4 /*--------------------------------------------------------------------*/
5
6 /*
7 This file is part of Valgrind, a dynamic binary instrumentation
8 framework.
9
10 Copyright (C) 2000-2013 Julian Seward
11 jseward@acm.org
12
13 This program is free software; you can redistribute it and/or
14 modify it under the terms of the GNU General Public License as
15 published by the Free Software Foundation; either version 2 of the
16 License, or (at your option) any later version.
17
18 This program is distributed in the hope that it will be useful, but
19 WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 General Public License for more details.
22
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
26 02111-1307, USA.
27
28 The GNU General Public License is contained in the file COPYING.
29 */
30
31 #include "pub_core_basics.h"
32 #include "pub_core_vki.h"
33 #include "pub_core_libcsetjmp.h" // to keep _threadstate.h happy
34 #include "pub_core_threadstate.h"
35 #include "pub_core_libcassert.h"
36 #include "pub_core_inner.h"
37 #if defined(ENABLE_INNER_CLIENT_REQUEST)
38 #include "helgrind/helgrind.h"
39 #endif
40
41 /*------------------------------------------------------------*/
42 /*--- Data structures. ---*/
43 /*------------------------------------------------------------*/
44
45 ThreadId VG_(running_tid) = VG_INVALID_THREADID;
46
47 ThreadState VG_(threads)[VG_N_THREADS] __attribute__((aligned(16)));
48
49 /*------------------------------------------------------------*/
50 /*--- Operations. ---*/
51 /*------------------------------------------------------------*/
52
VG_(init_Threads)53 void VG_(init_Threads)(void)
54 {
55 ThreadId tid;
56
57 for (tid = 1; tid < VG_N_THREADS; tid++) {
58 INNER_REQUEST(
59 ANNOTATE_BENIGN_RACE_SIZED(&VG_(threads)[tid].status,
60 sizeof(VG_(threads)[tid].status), ""));
61 INNER_REQUEST(
62 ANNOTATE_BENIGN_RACE_SIZED(&VG_(threads)[tid].os_state.exitcode,
63 sizeof(VG_(threads)[tid].os_state.exitcode),
64 ""));
65 }
66 }
67
VG_(name_of_ThreadStatus)68 const HChar* VG_(name_of_ThreadStatus) ( ThreadStatus status )
69 {
70 switch (status) {
71 case VgTs_Empty: return "VgTs_Empty";
72 case VgTs_Init: return "VgTs_Init";
73 case VgTs_Runnable: return "VgTs_Runnable";
74 case VgTs_WaitSys: return "VgTs_WaitSys";
75 case VgTs_Yielding: return "VgTs_Yielding";
76 case VgTs_Zombie: return "VgTs_Zombie";
77 default: return "VgTs_???";
78 }
79 }
80
VG_(name_of_VgSchedReturnCode)81 const HChar* VG_(name_of_VgSchedReturnCode) ( VgSchedReturnCode retcode )
82 {
83 switch (retcode) {
84 case VgSrc_None: return "VgSrc_None";
85 case VgSrc_ExitThread: return "VgSrc_ExitThread";
86 case VgSrc_ExitProcess: return "VgSrc_ExitProcess";
87 case VgSrc_FatalSig: return "VgSrc_FatalSig";
88 default: return "VgSrc_???";
89 }
90 }
91
VG_(get_ThreadState)92 ThreadState *VG_(get_ThreadState)(ThreadId tid)
93 {
94 vg_assert(tid >= 0 && tid < VG_N_THREADS);
95 vg_assert(VG_(threads)[tid].tid == tid);
96 return &VG_(threads)[tid];
97 }
98
VG_(is_valid_tid)99 Bool VG_(is_valid_tid) ( ThreadId tid )
100 {
101 /* tid is unsigned, hence no < 0 test. */
102 if (tid == 0) return False;
103 if (tid >= VG_N_THREADS) return False;
104 if (VG_(threads)[tid].status == VgTs_Empty) return False;
105 return True;
106 }
107
108 // This function is for tools to call.
VG_(get_running_tid)109 ThreadId VG_(get_running_tid)(void)
110 {
111 return VG_(running_tid);
112 }
113
VG_(is_running_thread)114 Bool VG_(is_running_thread)(ThreadId tid)
115 {
116 ThreadState *tst = VG_(get_ThreadState)(tid);
117
118 return
119 // tst->os_state.lwpid == VG_(gettid)() && // check we're this tid
120 VG_(running_tid) == tid && // and that we've got the lock
121 tst->status == VgTs_Runnable; // and we're runnable
122 }
123
124 /* Return true if the thread is still alive but in the process of exiting. */
VG_(is_exiting)125 inline Bool VG_(is_exiting)(ThreadId tid)
126 {
127 vg_assert(VG_(is_valid_tid)(tid));
128 return VG_(threads)[tid].exitreason != VgSrc_None;
129 }
130
131 /* Return the number of non-dead Threads */
VG_(count_living_threads)132 Int VG_(count_living_threads)(void)
133 {
134 Int count = 0;
135 ThreadId tid;
136
137 for(tid = 1; tid < VG_N_THREADS; tid++)
138 if (VG_(threads)[tid].status != VgTs_Empty &&
139 VG_(threads)[tid].status != VgTs_Zombie)
140 count++;
141
142 return count;
143 }
144
145 /* Return the number of threads in VgTs_Runnable state */
VG_(count_runnable_threads)146 Int VG_(count_runnable_threads)(void)
147 {
148 Int count = 0;
149 ThreadId tid;
150
151 for(tid = 1; tid < VG_N_THREADS; tid++)
152 if (VG_(threads)[tid].status == VgTs_Runnable)
153 count++;
154
155 return count;
156 }
157
158 /* Given an LWP id (ie, real kernel thread id), find the corresponding
159 ThreadId */
VG_(lwpid_to_vgtid)160 ThreadId VG_(lwpid_to_vgtid)(Int lwp)
161 {
162 ThreadId tid;
163
164 for(tid = 1; tid < VG_N_THREADS; tid++)
165 if (VG_(threads)[tid].status != VgTs_Empty
166 && VG_(threads)[tid].os_state.lwpid == lwp)
167 return tid;
168
169 return VG_INVALID_THREADID;
170 }
171
172 /*--------------------------------------------------------------------*/
173 /*--- end ---*/
174 /*--------------------------------------------------------------------*/
175