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      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) 2000-2010 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_libcassert.h"
     35 
     36 /*------------------------------------------------------------*/
     37 /*--- Data structures.                                     ---*/
     38 /*------------------------------------------------------------*/
     39 
     40 ThreadId VG_(running_tid) = VG_INVALID_THREADID;
     41 
     42 ThreadState VG_(threads)[VG_N_THREADS];
     43 
     44 /*------------------------------------------------------------*/
     45 /*--- Operations.                                          ---*/
     46 /*------------------------------------------------------------*/
     47 
     48 const HChar* VG_(name_of_ThreadStatus) ( ThreadStatus status )
     49 {
     50    switch (status) {
     51    case VgTs_Empty:     return "VgTs_Empty";
     52    case VgTs_Init:      return "VgTs_Init";
     53    case VgTs_Runnable:  return "VgTs_Runnable";
     54    case VgTs_WaitSys:   return "VgTs_WaitSys";
     55    case VgTs_Yielding:  return "VgTs_Yielding";
     56    case VgTs_Zombie:    return "VgTs_Zombie";
     57    default:             return "VgTs_???";
     58   }
     59 }
     60 
     61 ThreadState *VG_(get_ThreadState)(ThreadId tid)
     62 {
     63    vg_assert(tid >= 0 && tid < VG_N_THREADS);
     64    vg_assert(VG_(threads)[tid].tid == tid);
     65    return &VG_(threads)[tid];
     66 }
     67 
     68 Bool VG_(is_valid_tid) ( ThreadId tid )
     69 {
     70    /* tid is unsigned, hence no < 0 test. */
     71    if (tid == 0) return False;
     72    if (tid >= VG_N_THREADS) return False;
     73    if (VG_(threads)[tid].status == VgTs_Empty) return False;
     74    return True;
     75 }
     76 
     77 // This function is for tools to call.
     78 ThreadId VG_(get_running_tid)(void)
     79 {
     80    return VG_(running_tid);
     81 }
     82 
     83 Bool VG_(is_running_thread)(ThreadId tid)
     84 {
     85    ThreadState *tst = VG_(get_ThreadState)(tid);
     86 
     87    return
     88 //      tst->os_state.lwpid == VG_(gettid)() &&	// check we're this tid
     89       VG_(running_tid) == tid	           &&	// and that we've got the lock
     90       tst->status == VgTs_Runnable;		// and we're runnable
     91 }
     92 
     93 /* Return true if the thread is still alive but in the process of exiting. */
     94 inline Bool VG_(is_exiting)(ThreadId tid)
     95 {
     96    vg_assert(VG_(is_valid_tid)(tid));
     97    return VG_(threads)[tid].exitreason != VgSrc_None;
     98 }
     99 
    100 /* Return the number of non-dead Threads */
    101 Int VG_(count_living_threads)(void)
    102 {
    103    Int count = 0;
    104    ThreadId tid;
    105 
    106    for(tid = 1; tid < VG_N_THREADS; tid++)
    107       if (VG_(threads)[tid].status != VgTs_Empty &&
    108 	  VG_(threads)[tid].status != VgTs_Zombie)
    109 	 count++;
    110 
    111    return count;
    112 }
    113 
    114 /* Return the number of threads in VgTs_Runnable state */
    115 Int VG_(count_runnable_threads)(void)
    116 {
    117    Int count = 0;
    118    ThreadId tid;
    119 
    120    for(tid = 1; tid < VG_N_THREADS; tid++)
    121       if (VG_(threads)[tid].status == VgTs_Runnable)
    122 	 count++;
    123 
    124    return count;
    125 }
    126 
    127 /* Given an LWP id (ie, real kernel thread id), find the corresponding
    128    ThreadId */
    129 ThreadId VG_(lwpid_to_vgtid)(Int lwp)
    130 {
    131    ThreadId tid;
    132 
    133    for(tid = 1; tid < VG_N_THREADS; tid++)
    134       if (VG_(threads)[tid].status != VgTs_Empty
    135           && VG_(threads)[tid].os_state.lwpid == lwp)
    136 	 return tid;
    137 
    138    return VG_INVALID_THREADID;
    139 }
    140 
    141 /*--------------------------------------------------------------------*/
    142 /*--- end                                                          ---*/
    143 /*--------------------------------------------------------------------*/
    144