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8e605f14c5
Activating this hint using --sim-hints=no-nptl-pthread-stackcache means the glibc nptl stack cache will be disabled. Disabling this stack/tls cache avoids helgrind false positive race conditions errors when using __thread variables. Note: disabling the stack cache is done by a kludge, dependent on internal knowledge of glibc code, and using libpthread debug info. So, this kludge might be broken with newer glibc version. This has been tested on various platforms and various glibc versions 2.11, 2.16 and 2.18 To check if the disabling works, you can do: valgrind --tool=helgrind --sim-hints=no-nptl-pthread-stackcache -d -v ./helgrind/tests/tls_threads |& grep kludge If you see the below 2 lines, then hopefully the stack cache has been disabled. --12624-- deactivate nptl pthread stackcache via kludge: found symbol stack_cache_actsize at addr 0x3AF178 --12624:1:sched pthread stack cache size disabling done via kludge git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14313
119 lines
4.7 KiB
C
119 lines
4.7 KiB
C
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/*--------------------------------------------------------------------*/
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/*--- Misc client state info pub_core_clientstate.h ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2000-2013 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#ifndef __PUB_CORE_CLIENTSTATE_H
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#define __PUB_CORE_CLIENTSTATE_H
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//--------------------------------------------------------------------
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// PURPOSE: This module holds various bits of client state which don't
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// live comfortably anywhere else. Note that the ThreadStates for the
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// client don't live here; they instead live in m_threadstate.h. Most
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// of these values are set once at startup and not changed later.
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//--------------------------------------------------------------------
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#include "pub_tool_clientstate.h"
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// Address space globals
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extern Addr VG_(clstk_base); // client stack range
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extern Addr VG_(clstk_end);
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extern UWord VG_(clstk_id); // client stack id
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/* linux only: where is the client auxv ? */
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/* This is setup as part of setup_client_stack in initimg-linux.c. */
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extern UWord* VG_(client_auxv);
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extern Addr VG_(brk_base); // start of brk
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extern Addr VG_(brk_limit); // current brk
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/* A fd which refers to the client executable. */
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extern Int VG_(cl_exec_fd);
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/* A fd which refers to the fake /proc/<pid>/cmdline in /tmp. The
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idea is: make up the /proc/<pid>/cmdline file the client would
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expect to see if it was running natively. Copy into a file in
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/tmp. When the client then does an open of /proc/<pid>/cmdline or
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/proc/self/cmdline, instead give it a file handle to the file in
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/tmp. The problem of deleting said file when Valgrind exits is
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neatly sidestepped by unlinking it as soon as it has been created,
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but holding on to the file handle. That causes the kernel to keep
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the file contents alive exactly until the process exits. */
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extern Int VG_(cl_cmdline_fd);
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/* Same as above, but for /proc/<pid>/auxv. */
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extern Int VG_(cl_auxv_fd);
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// Client's original rlimit data and rlimit stack
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extern struct vki_rlimit VG_(client_rlimit_data);
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extern struct vki_rlimit VG_(client_rlimit_stack);
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// Name of the launcher, as extracted from VALGRIND_LAUNCHER at
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// startup.
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extern HChar* VG_(name_of_launcher);
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/* Application-visible file descriptor limits */
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extern Int VG_(fd_soft_limit);
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extern Int VG_(fd_hard_limit);
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/* Useful addresses extracted from the client */
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/* Where is the __libc_freeres_wrapper routine we made? */
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extern Addr VG_(client___libc_freeres_wrapper);
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/* x86-linux only: where is ld.so's _dl_sysinfo_int80 function?
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Finding it isn't essential, but knowing where it is does sometimes
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help produce better back traces. See big comment in
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VG_(get_StackTrace) in m_stacktrace.c for further info. */
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extern Addr VG_(client__dl_sysinfo_int80);
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/* glibc nptl pthread systems only, when no-nptl-pthread-stackcache
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was given in --sim-hints.
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Used for a (kludgy) way to disable the cache of stacks as implemented in
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nptl glibc.
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Based on internal knowledge of the pthread glibc nptl/allocatestack.c code:
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a huge value in stack_cache_actsize (bigger than the constant
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stack_cache_maxsize) makes glibc believes the cache is full
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and so stacks are always released when a pthread terminates.
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Several ugliness in this kludge:
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* hardcodes private glibc var name "stack_cache_maxsize"
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* based on knowledge of the code of the functions
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queue_stack and __free_stacks
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* static symbol for "stack_cache_maxsize" must be in
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the debug info.
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It would be much cleaner to have a documented and supported
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way to disable the pthread stack cache. */
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extern SizeT* VG_(client__stack_cache_actsize__addr);
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#endif // __PUB_CORE_CLIENTSTATE_H
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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