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/*--------------------------------------------------------------------*/
/*--- The thread state. m_threadstate.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2017 Julian Seward
jseward@acm.org
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
The GNU General Public License is contained in the file COPYING.
*/
#include "pub_core_basics.h"
#include "pub_core_vki.h"
#include "pub_core_threadstate.h"
#include "pub_core_mallocfree.h" // VG_(malloc)
#include "pub_core_libcassert.h"
#include "pub_core_inner.h"
#if defined(ENABLE_INNER_CLIENT_REQUEST)
#include "helgrind/helgrind.h"
#endif
/*------------------------------------------------------------*/
/*--- Data structures. ---*/
/*------------------------------------------------------------*/
ThreadId VG_(running_tid) = VG_INVALID_THREADID;
ThreadState *VG_(threads);
UInt VG_N_THREADS;
ThreadState *VG_(inner_threads);
/*------------------------------------------------------------*/
/*--- Operations. ---*/
/*------------------------------------------------------------*/
void VG_(init_Threads)(void)
{
ThreadId tid;
VG_(threads) = VG_(arena_memalign) (VG_AR_CORE, "init_Threads",
LibVEX_GUEST_STATE_ALIGN,
VG_N_THREADS * sizeof VG_(threads)[0]);
for (tid = 1; tid < VG_N_THREADS; tid++) {
INNER_REQUEST(
ANNOTATE_BENIGN_RACE_SIZED(&VG_(threads)[tid].status,
sizeof(VG_(threads)[tid].status), ""));
INNER_REQUEST(
ANNOTATE_BENIGN_RACE_SIZED(&VG_(threads)[tid].os_state.exitcode,
sizeof(VG_(threads)[tid].os_state.exitcode),
""));
}
INNER_REQUEST(VALGRIND_INNER_THREADS(VG_(threads)));
}
const HChar* VG_(name_of_ThreadStatus) ( ThreadStatus status )
{
switch (status) {
case VgTs_Empty: return "VgTs_Empty";
case VgTs_Init: return "VgTs_Init";
case VgTs_Runnable: return "VgTs_Runnable";
case VgTs_WaitSys: return "VgTs_WaitSys";
case VgTs_Yielding: return "VgTs_Yielding";
case VgTs_Zombie: return "VgTs_Zombie";
default: return "VgTs_???";
}
}
const HChar* VG_(name_of_VgSchedReturnCode) ( VgSchedReturnCode retcode )
{
switch (retcode) {
case VgSrc_None: return "VgSrc_None";
case VgSrc_ExitThread: return "VgSrc_ExitThread";
case VgSrc_ExitProcess: return "VgSrc_ExitProcess";
case VgSrc_FatalSig: return "VgSrc_FatalSig";
default: return "VgSrc_???";
}
}
ThreadState *VG_(get_ThreadState)(ThreadId tid)
{
vg_assert(tid < VG_N_THREADS);
vg_assert(VG_(threads)[tid].tid == tid);
return &VG_(threads)[tid];
}
Bool VG_(is_valid_tid) ( ThreadId tid )
{
/* tid is unsigned, hence no < 0 test. */
if (tid == 0) return False;
if (tid >= VG_N_THREADS) return False;
if (VG_(threads)[tid].status == VgTs_Empty) return False;
return True;
}
// This function is for tools to call.
ThreadId VG_(get_running_tid)(void)
{
return VG_(running_tid);
}
Bool VG_(is_running_thread)(ThreadId tid)
{
ThreadState *tst = VG_(get_ThreadState)(tid);
return
// tst->os_state.lwpid == VG_(gettid)() && // check we're this tid
VG_(running_tid) == tid && // and that we've got the lock
tst->status == VgTs_Runnable; // and we're runnable
}
/* Return true if the thread is still alive but in the process of exiting. */
inline Bool VG_(is_exiting)(ThreadId tid)
{
vg_assert(VG_(is_valid_tid)(tid));
return VG_(threads)[tid].exitreason != VgSrc_None;
}
/* Return the number of non-dead Threads */
Int VG_(count_living_threads)(void)
{
Int count = 0;
ThreadId tid;
for(tid = 1; tid < VG_N_THREADS; tid++)
if (VG_(threads)[tid].status != VgTs_Empty &&
VG_(threads)[tid].status != VgTs_Zombie)
count++;
return count;
}
/* Return the number of threads in VgTs_Runnable state */
Int VG_(count_runnable_threads)(void)
{
Int count = 0;
ThreadId tid;
for(tid = 1; tid < VG_N_THREADS; tid++)
if (VG_(threads)[tid].status == VgTs_Runnable)
count++;
return count;
}
/* Given an LWP id (ie, real kernel thread id), find the corresponding
ThreadId */
ThreadId VG_(lwpid_to_vgtid)(Int lwp)
{
ThreadId tid;
for(tid = 1; tid < VG_N_THREADS; tid++)
if (VG_(threads)[tid].status != VgTs_Empty
&& VG_(threads)[tid].os_state.lwpid == lwp)
return tid;
return VG_INVALID_THREADID;
}
ThreadId VG_(lwpid_to_vgtid_dead_ok)(Int lwp)
{
ThreadId tid = VG_(lwpid_to_vgtid)(lwp);
if (tid != VG_INVALID_THREADID)
return tid;
for(tid = 1; tid < VG_N_THREADS; tid++)
if (VG_(threads)[tid].os_state.lwpid == lwp)
return tid;
return VG_INVALID_THREADID;
}
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
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