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) 2000-2015 Julian Seward 11 jseward (at) 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 54 void VG_(init_Threads)(void) 55 { 56 ThreadId tid; 57 58 VG_(threads) = VG_(arena_memalign) (VG_AR_CORE, "init_Threads", 59 LibVEX_GUEST_STATE_ALIGN, 60 VG_N_THREADS * sizeof VG_(threads)[0]); 61 62 for (tid = 1; tid < VG_N_THREADS; tid++) { 63 INNER_REQUEST( 64 ANNOTATE_BENIGN_RACE_SIZED(&VG_(threads)[tid].status, 65 sizeof(VG_(threads)[tid].status), "")); 66 INNER_REQUEST( 67 ANNOTATE_BENIGN_RACE_SIZED(&VG_(threads)[tid].os_state.exitcode, 68 sizeof(VG_(threads)[tid].os_state.exitcode), 69 "")); 70 } 71 } 72 73 const HChar* VG_(name_of_ThreadStatus) ( ThreadStatus status ) 74 { 75 switch (status) { 76 case VgTs_Empty: return "VgTs_Empty"; 77 case VgTs_Init: return "VgTs_Init"; 78 case VgTs_Runnable: return "VgTs_Runnable"; 79 case VgTs_WaitSys: return "VgTs_WaitSys"; 80 case VgTs_Yielding: return "VgTs_Yielding"; 81 case VgTs_Zombie: return "VgTs_Zombie"; 82 default: return "VgTs_???"; 83 } 84 } 85 86 const HChar* VG_(name_of_VgSchedReturnCode) ( VgSchedReturnCode retcode ) 87 { 88 switch (retcode) { 89 case VgSrc_None: return "VgSrc_None"; 90 case VgSrc_ExitThread: return "VgSrc_ExitThread"; 91 case VgSrc_ExitProcess: return "VgSrc_ExitProcess"; 92 case VgSrc_FatalSig: return "VgSrc_FatalSig"; 93 default: return "VgSrc_???"; 94 } 95 } 96 97 ThreadState *VG_(get_ThreadState)(ThreadId tid) 98 { 99 vg_assert(tid >= 0 && tid < VG_N_THREADS); 100 vg_assert(VG_(threads)[tid].tid == tid); 101 return &VG_(threads)[tid]; 102 } 103 104 Bool VG_(is_valid_tid) ( ThreadId tid ) 105 { 106 /* tid is unsigned, hence no < 0 test. */ 107 if (tid == 0) return False; 108 if (tid >= VG_N_THREADS) return False; 109 if (VG_(threads)[tid].status == VgTs_Empty) return False; 110 return True; 111 } 112 113 // This function is for tools to call. 114 ThreadId VG_(get_running_tid)(void) 115 { 116 return VG_(running_tid); 117 } 118 119 Bool VG_(is_running_thread)(ThreadId tid) 120 { 121 ThreadState *tst = VG_(get_ThreadState)(tid); 122 123 return 124 // tst->os_state.lwpid == VG_(gettid)() && // check we're this tid 125 VG_(running_tid) == tid && // and that we've got the lock 126 tst->status == VgTs_Runnable; // and we're runnable 127 } 128 129 /* Return true if the thread is still alive but in the process of exiting. */ 130 inline Bool VG_(is_exiting)(ThreadId tid) 131 { 132 vg_assert(VG_(is_valid_tid)(tid)); 133 return VG_(threads)[tid].exitreason != VgSrc_None; 134 } 135 136 /* Return the number of non-dead Threads */ 137 Int VG_(count_living_threads)(void) 138 { 139 Int count = 0; 140 ThreadId tid; 141 142 for(tid = 1; tid < VG_N_THREADS; tid++) 143 if (VG_(threads)[tid].status != VgTs_Empty && 144 VG_(threads)[tid].status != VgTs_Zombie) 145 count++; 146 147 return count; 148 } 149 150 /* Return the number of threads in VgTs_Runnable state */ 151 Int VG_(count_runnable_threads)(void) 152 { 153 Int count = 0; 154 ThreadId tid; 155 156 for(tid = 1; tid < VG_N_THREADS; tid++) 157 if (VG_(threads)[tid].status == VgTs_Runnable) 158 count++; 159 160 return count; 161 } 162 163 /* Given an LWP id (ie, real kernel thread id), find the corresponding 164 ThreadId */ 165 ThreadId VG_(lwpid_to_vgtid)(Int lwp) 166 { 167 ThreadId tid; 168 169 for(tid = 1; tid < VG_N_THREADS; tid++) 170 if (VG_(threads)[tid].status != VgTs_Empty 171 && VG_(threads)[tid].os_state.lwpid == lwp) 172 return tid; 173 174 return VG_INVALID_THREADID; 175 } 176 177 /*--------------------------------------------------------------------*/ 178 /*--- end ---*/ 179 /*--------------------------------------------------------------------*/ 180
