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 (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 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 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 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 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. 79 ThreadId VG_(get_running_tid)(void) 80 { 81 return VG_(running_tid); 82 } 83 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. */ 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 */ 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 */ 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 */ 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