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 (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 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 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 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 } 100 101 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 } 107 108 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. 118 ThreadId VG_(get_running_tid)(void) 119 { 120 return VG_(running_tid); 121 } 122 123 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. */ 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 */ 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 */ 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 */ 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
