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) 2000-2011 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
37 /*------------------------------------------------------------*/
38 /*--- Data structures. ---*/
39 /*------------------------------------------------------------*/
40
41 ThreadId VG_(running_tid) = VG_INVALID_THREADID;
42
43 ThreadState VG_(threads)[VG_N_THREADS];
44
45 /*------------------------------------------------------------*/
46 /*--- Operations. ---*/
47 /*------------------------------------------------------------*/
48
VG_(name_of_ThreadStatus)49 const HChar* VG_(name_of_ThreadStatus) ( ThreadStatus status )
50 {
51 switch (status) {
52 case VgTs_Empty: return "VgTs_Empty";
53 case VgTs_Init: return "VgTs_Init";
54 case VgTs_Runnable: return "VgTs_Runnable";
55 case VgTs_WaitSys: return "VgTs_WaitSys";
56 case VgTs_Yielding: return "VgTs_Yielding";
57 case VgTs_Zombie: return "VgTs_Zombie";
58 default: return "VgTs_???";
59 }
60 }
61
VG_(get_ThreadState)62 ThreadState *VG_(get_ThreadState)(ThreadId tid)
63 {
64 vg_assert(tid >= 0 && tid < VG_N_THREADS);
65 vg_assert(VG_(threads)[tid].tid == tid);
66 return &VG_(threads)[tid];
67 }
68
VG_(is_valid_tid)69 Bool VG_(is_valid_tid) ( ThreadId tid )
70 {
71 /* tid is unsigned, hence no < 0 test. */
72 if (tid == 0) return False;
73 if (tid >= VG_N_THREADS) return False;
74 if (VG_(threads)[tid].status == VgTs_Empty) return False;
75 return True;
76 }
77
78 // This function is for tools to call.
VG_(get_running_tid)79 ThreadId VG_(get_running_tid)(void)
80 {
81 return VG_(running_tid);
82 }
83
VG_(is_running_thread)84 Bool VG_(is_running_thread)(ThreadId tid)
85 {
86 ThreadState *tst = VG_(get_ThreadState)(tid);
87
88 return
89 // tst->os_state.lwpid == VG_(gettid)() && // check we're this tid
90 VG_(running_tid) == tid && // and that we've got the lock
91 tst->status == VgTs_Runnable; // and we're runnable
92 }
93
94 /* Return true if the thread is still alive but in the process of exiting. */
VG_(is_exiting)95 inline Bool VG_(is_exiting)(ThreadId tid)
96 {
97 vg_assert(VG_(is_valid_tid)(tid));
98 return VG_(threads)[tid].exitreason != VgSrc_None;
99 }
100
101 /* Return the number of non-dead Threads */
VG_(count_living_threads)102 Int VG_(count_living_threads)(void)
103 {
104 Int count = 0;
105 ThreadId tid;
106
107 for(tid = 1; tid < VG_N_THREADS; tid++)
108 if (VG_(threads)[tid].status != VgTs_Empty &&
109 VG_(threads)[tid].status != VgTs_Zombie)
110 count++;
111
112 return count;
113 }
114
115 /* Return the number of threads in VgTs_Runnable state */
VG_(count_runnable_threads)116 Int VG_(count_runnable_threads)(void)
117 {
118 Int count = 0;
119 ThreadId tid;
120
121 for(tid = 1; tid < VG_N_THREADS; tid++)
122 if (VG_(threads)[tid].status == VgTs_Runnable)
123 count++;
124
125 return count;
126 }
127
128 /* Given an LWP id (ie, real kernel thread id), find the corresponding
129 ThreadId */
VG_(lwpid_to_vgtid)130 ThreadId VG_(lwpid_to_vgtid)(Int lwp)
131 {
132 ThreadId tid;
133
134 for(tid = 1; tid < VG_N_THREADS; tid++)
135 if (VG_(threads)[tid].status != VgTs_Empty
136 && VG_(threads)[tid].os_state.lwpid == lwp)
137 return tid;
138
139 return VG_INVALID_THREADID;
140 }
141
142 /*--------------------------------------------------------------------*/
143 /*--- end ---*/
144 /*--------------------------------------------------------------------*/
145