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_threadstate.h"
34 #include "pub_core_mallocfree.h" // VG_(malloc)
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);
48 UInt VG_N_THREADS;
49
50 /*------------------------------------------------------------*/
51 /*--- Operations. ---*/
52 /*------------------------------------------------------------*/
53
VG_(init_Threads)54 void VG_(init_Threads)(void)
55 {
56 ThreadId tid;
57 UChar *addr, *aligned_addr;
58
59 addr = VG_(malloc)("init_Threads",
60 VG_N_THREADS * sizeof VG_(threads)[0] + LibVEX_GUEST_STATE_ALIGN - 1);
61
62 // Align
63 aligned_addr = addr + (Addr)addr % LibVEX_GUEST_STATE_ALIGN;
64 VG_(threads) = (ThreadState *)aligned_addr;
65
66 for (tid = 1; tid < VG_N_THREADS; tid++) {
67 INNER_REQUEST(
68 ANNOTATE_BENIGN_RACE_SIZED(&VG_(threads)[tid].status,
69 sizeof(VG_(threads)[tid].status), ""));
70 INNER_REQUEST(
71 ANNOTATE_BENIGN_RACE_SIZED(&VG_(threads)[tid].os_state.exitcode,
72 sizeof(VG_(threads)[tid].os_state.exitcode),
73 ""));
74 }
75 }
76
VG_(name_of_ThreadStatus)77 const HChar* VG_(name_of_ThreadStatus) ( ThreadStatus status )
78 {
79 switch (status) {
80 case VgTs_Empty: return "VgTs_Empty";
81 case VgTs_Init: return "VgTs_Init";
82 case VgTs_Runnable: return "VgTs_Runnable";
83 case VgTs_WaitSys: return "VgTs_WaitSys";
84 case VgTs_Yielding: return "VgTs_Yielding";
85 case VgTs_Zombie: return "VgTs_Zombie";
86 default: return "VgTs_???";
87 }
88 }
89
VG_(name_of_VgSchedReturnCode)90 const HChar* VG_(name_of_VgSchedReturnCode) ( VgSchedReturnCode retcode )
91 {
92 switch (retcode) {
93 case VgSrc_None: return "VgSrc_None";
94 case VgSrc_ExitThread: return "VgSrc_ExitThread";
95 case VgSrc_ExitProcess: return "VgSrc_ExitProcess";
96 case VgSrc_FatalSig: return "VgSrc_FatalSig";
97 default: return "VgSrc_???";
98 }
99 }
100
VG_(get_ThreadState)101 ThreadState *VG_(get_ThreadState)(ThreadId tid)
102 {
103 vg_assert(tid >= 0 && tid < VG_N_THREADS);
104 vg_assert(VG_(threads)[tid].tid == tid);
105 return &VG_(threads)[tid];
106 }
107
VG_(is_valid_tid)108 Bool VG_(is_valid_tid) ( ThreadId tid )
109 {
110 /* tid is unsigned, hence no < 0 test. */
111 if (tid == 0) return False;
112 if (tid >= VG_N_THREADS) return False;
113 if (VG_(threads)[tid].status == VgTs_Empty) return False;
114 return True;
115 }
116
117 // This function is for tools to call.
VG_(get_running_tid)118 ThreadId VG_(get_running_tid)(void)
119 {
120 return VG_(running_tid);
121 }
122
VG_(is_running_thread)123 Bool VG_(is_running_thread)(ThreadId tid)
124 {
125 ThreadState *tst = VG_(get_ThreadState)(tid);
126
127 return
128 // tst->os_state.lwpid == VG_(gettid)() && // check we're this tid
129 VG_(running_tid) == tid && // and that we've got the lock
130 tst->status == VgTs_Runnable; // and we're runnable
131 }
132
133 /* Return true if the thread is still alive but in the process of exiting. */
VG_(is_exiting)134 inline Bool VG_(is_exiting)(ThreadId tid)
135 {
136 vg_assert(VG_(is_valid_tid)(tid));
137 return VG_(threads)[tid].exitreason != VgSrc_None;
138 }
139
140 /* Return the number of non-dead Threads */
VG_(count_living_threads)141 Int VG_(count_living_threads)(void)
142 {
143 Int count = 0;
144 ThreadId tid;
145
146 for(tid = 1; tid < VG_N_THREADS; tid++)
147 if (VG_(threads)[tid].status != VgTs_Empty &&
148 VG_(threads)[tid].status != VgTs_Zombie)
149 count++;
150
151 return count;
152 }
153
154 /* Return the number of threads in VgTs_Runnable state */
VG_(count_runnable_threads)155 Int VG_(count_runnable_threads)(void)
156 {
157 Int count = 0;
158 ThreadId tid;
159
160 for(tid = 1; tid < VG_N_THREADS; tid++)
161 if (VG_(threads)[tid].status == VgTs_Runnable)
162 count++;
163
164 return count;
165 }
166
167 /* Given an LWP id (ie, real kernel thread id), find the corresponding
168 ThreadId */
VG_(lwpid_to_vgtid)169 ThreadId VG_(lwpid_to_vgtid)(Int lwp)
170 {
171 ThreadId tid;
172
173 for(tid = 1; tid < VG_N_THREADS; tid++)
174 if (VG_(threads)[tid].status != VgTs_Empty
175 && VG_(threads)[tid].os_state.lwpid == lwp)
176 return tid;
177
178 return VG_INVALID_THREADID;
179 }
180
181 /*--------------------------------------------------------------------*/
182 /*--- end ---*/
183 /*--------------------------------------------------------------------*/
184