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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) 2000-2011 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