coregrind/m_threadstate.c

   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) 2000-2017 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_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 ThreadState *VG_(inner_threads);
  51
  52 /*------------------------------------------------------------*/
  53 /*--- Operations.                                          ---*/
  54 /*------------------------------------------------------------*/
  55
  56 void VG_(init_Threads)(void)
  57 {
  58    ThreadId tid;
  59
  60    VG_(threads) = VG_(arena_memalign) (VG_AR_CORE, "init_Threads",
  61                                        LibVEX_GUEST_STATE_ALIGN,
  62                                        VG_N_THREADS * sizeof VG_(threads)[0]);
  63
  64    for (tid = 1; tid < VG_N_THREADS; tid++) {
  65       INNER_REQUEST(
  66          ANNOTATE_BENIGN_RACE_SIZED(&VG_(threads)[tid].status,
  67                                     sizeof(VG_(threads)[tid].status), ""));
  68       INNER_REQUEST(
  69          ANNOTATE_BENIGN_RACE_SIZED(&VG_(threads)[tid].os_state.exitcode,
  70                                     sizeof(VG_(threads)[tid].os_state.exitcode),
  71                                     ""));
  72    }
  73    INNER_REQUEST(VALGRIND_INNER_THREADS(VG_(threads)));
  74 }
  75
  76 const HChar* VG_(name_of_ThreadStatus) ( ThreadStatus status )
  77 {
  78    switch (status) {
  79    case VgTs_Empty:     return "VgTs_Empty";
  80    case VgTs_Init:      return "VgTs_Init";
  81    case VgTs_Runnable:  return "VgTs_Runnable";
  82    case VgTs_WaitSys:   return "VgTs_WaitSys";
  83    case VgTs_Yielding:  return "VgTs_Yielding";
  84    case VgTs_Zombie:    return "VgTs_Zombie";
  85    default:             return "VgTs_???";
  86   }
  87 }
  88
  89 const HChar* VG_(name_of_VgSchedReturnCode) ( VgSchedReturnCode retcode )
  90 {
  91    switch (retcode) {
  92    case VgSrc_None:        return "VgSrc_None";
  93    case VgSrc_ExitThread:  return "VgSrc_ExitThread";
  94    case VgSrc_ExitProcess: return "VgSrc_ExitProcess";
  95    case VgSrc_FatalSig:    return "VgSrc_FatalSig";
  96    default:                return "VgSrc_???";
  97   }
  98 }
  99
 100 ThreadState *VG_(get_ThreadState)(ThreadId tid)
 101 {
 102    vg_assert(tid >= 0 && tid < VG_N_THREADS);
 103    vg_assert(VG_(threads)[tid].tid == tid);
 104    return &VG_(threads)[tid];
 105 }
 106
 107 Bool VG_(is_valid_tid) ( ThreadId tid )
 108 {
 109    /* tid is unsigned, hence no < 0 test. */
 110    if (tid == 0) return False;
 111    if (tid >= VG_N_THREADS) return False;
 112    if (VG_(threads)[tid].status == VgTs_Empty) return False;
 113    return True;
 114 }
 115
 116 // This function is for tools to call.
 117 ThreadId VG_(get_running_tid)(void)
 118 {
 119    return VG_(running_tid);
 120 }
 121
 122 Bool VG_(is_running_thread)(ThreadId tid)
 123 {
 124    ThreadState *tst = VG_(get_ThreadState)(tid);
 125
 126    return
 127 //      tst->os_state.lwpid == VG_(gettid)() && // check we're this tid
 128       VG_(running_tid) == tid              &&   // and that we've got the lock
 129       tst->status == VgTs_Runnable;             // and we're runnable
 130 }
 131
 132 /* Return true if the thread is still alive but in the process of exiting. */
 133 inline Bool VG_(is_exiting)(ThreadId tid)
 134 {
 135    vg_assert(VG_(is_valid_tid)(tid));
 136    return VG_(threads)[tid].exitreason != VgSrc_None;
 137 }
 138
 139 /* Return the number of non-dead Threads */
 140 Int VG_(count_living_threads)(void)
 141 {
 142    Int count = 0;
 143    ThreadId tid;
 144
 145    for(tid = 1; tid < VG_N_THREADS; tid++)
 146       if (VG_(threads)[tid].status != VgTs_Empty &&
 147           VG_(threads)[tid].status != VgTs_Zombie)
 148          count++;
 149
 150    return count;
 151 }
 152
 153 /* Return the number of threads in VgTs_Runnable state */
 154 Int VG_(count_runnable_threads)(void)
 155 {
 156    Int count = 0;
 157    ThreadId tid;
 158
 159    for(tid = 1; tid < VG_N_THREADS; tid++)
 160       if (VG_(threads)[tid].status == VgTs_Runnable)
 161          count++;
 162
 163    return count;
 164 }
 165
 166 /* Given an LWP id (ie, real kernel thread id), find the corresponding
 167    ThreadId */
 168 ThreadId VG_(lwpid_to_vgtid)(Int lwp)
 169 {
 170    ThreadId tid;
 171
 172    for(tid = 1; tid < VG_N_THREADS; tid++)
 173       if (VG_(threads)[tid].status != VgTs_Empty
 174           && VG_(threads)[tid].os_state.lwpid == lwp)
 175          return tid;
 176
 177    return VG_INVALID_THREADID;
 178 }
 179
 180 ThreadId VG_(lwpid_to_vgtid_dead_ok)(Int lwp)
 181 {
 182    ThreadId tid = VG_(lwpid_to_vgtid)(lwp);
 183
 184    if (tid != VG_INVALID_THREADID)
 185       return tid;
 186
 187    for(tid = 1; tid < VG_N_THREADS; tid++)
 188       if (VG_(threads)[tid].os_state.lwpid == lwp)
 189          return tid;
 190
 191    return VG_INVALID_THREADID;
 192 }
 193
 194 /*--------------------------------------------------------------------*/
 195 /*--- end                                                          ---*/
 196 /*--------------------------------------------------------------------*/