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) 2000-2012 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_libcsetjmp.h" // to keep _threadstate.h happy 34 #include "pub_core_threadstate.h" 35 #include "pub_core_libcassert.h" 36 #include "pub_tool_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 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 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 81 ThreadState *VG_(get_ThreadState)(ThreadId tid) 82 { 83 vg_assert(tid >= 0 && tid < VG_N_THREADS); 84 vg_assert(VG_(threads)[tid].tid == tid); 85 return &VG_(threads)[tid]; 86 } 87 88 Bool VG_(is_valid_tid) ( ThreadId tid ) 89 { 90 /* tid is unsigned, hence no < 0 test. */ 91 if (tid == 0) return False; 92 if (tid >= VG_N_THREADS) return False; 93 if (VG_(threads)[tid].status == VgTs_Empty) return False; 94 return True; 95 } 96 97 // This function is for tools to call. 98 ThreadId VG_(get_running_tid)(void) 99 { 100 return VG_(running_tid); 101 } 102 103 Bool VG_(is_running_thread)(ThreadId tid) 104 { 105 ThreadState *tst = VG_(get_ThreadState)(tid); 106 107 return 108 // tst->os_state.lwpid == VG_(gettid)() && // check we're this tid 109 VG_(running_tid) == tid && // and that we've got the lock 110 tst->status == VgTs_Runnable; // and we're runnable 111 } 112 113 /* Return true if the thread is still alive but in the process of exiting. */ 114 inline Bool VG_(is_exiting)(ThreadId tid) 115 { 116 vg_assert(VG_(is_valid_tid)(tid)); 117 return VG_(threads)[tid].exitreason != VgSrc_None; 118 } 119 120 /* Return the number of non-dead Threads */ 121 Int VG_(count_living_threads)(void) 122 { 123 Int count = 0; 124 ThreadId tid; 125 126 for(tid = 1; tid < VG_N_THREADS; tid++) 127 if (VG_(threads)[tid].status != VgTs_Empty && 128 VG_(threads)[tid].status != VgTs_Zombie) 129 count++; 130 131 return count; 132 } 133 134 /* Return the number of threads in VgTs_Runnable state */ 135 Int VG_(count_runnable_threads)(void) 136 { 137 Int count = 0; 138 ThreadId tid; 139 140 for(tid = 1; tid < VG_N_THREADS; tid++) 141 if (VG_(threads)[tid].status == VgTs_Runnable) 142 count++; 143 144 return count; 145 } 146 147 /* Given an LWP id (ie, real kernel thread id), find the corresponding 148 ThreadId */ 149 ThreadId VG_(lwpid_to_vgtid)(Int lwp) 150 { 151 ThreadId tid; 152 153 for(tid = 1; tid < VG_N_THREADS; tid++) 154 if (VG_(threads)[tid].status != VgTs_Empty 155 && VG_(threads)[tid].os_state.lwpid == lwp) 156 return tid; 157 158 return VG_INVALID_THREADID; 159 } 160 161 /*--------------------------------------------------------------------*/ 162 /*--- end ---*/ 163 /*--------------------------------------------------------------------*/ 164
