Re: [Boost-users] Does boost::thread_group::create_thread have memory leak?

From: pete_at_[hidden]
Date: 2007-01-20 22:53:57

Sorry, I've been out of town and I just got back in.

Here you go:

$ valgrind -v  threadgroup
==19432== Memcheck, a memory error detector.
==19432== Copyright (C) 2002-2006, and GNU GPL'd, by Julian Seward et
al.
==19432== Using LibVEX rev 1606, a library for dynamic binary
translation.
==19432== Copyright (C) 2004-2006, and GNU GPL'd, by OpenWorks LLP.
==19432== Using valgrind-3.2.0, a dynamic binary instrumentation
framework.
==19432== Copyright (C) 2000-2006, and GNU GPL'd, by Julian Seward et
al.
==19432== 
--19432-- Command line
--19432--    threadgroup
--19432-- Startup, with flags:
--19432--    --memcheck:leak-check=full
--19432--    --memcheck:error-limit=no
--19432--    --memcheck:num-callers=20
--19432--    --memcheck:leak-resolution=high
--19432--    --memcheck:show-reachable=yes
--19432--    --memcheck:show-below-main=yes
--19432--    --memcheck:trace-children=yes
--19432--    --memcheck:gen-suppressions=no
--19432--    -v
--19432-- Contents of /proc/version:
--19432--   Linux version 2.6.18-gentoo-r3 () (gcc version
4.1.1 (Gentoo 4.1.1-r1)) #7 SMP Fri Dec 8 15:47:16 CST 2006
--19432-- Arch and hwcaps: X86, x86-sse1-sse2
--19432-- Valgrind library directory: /usr/lib/valgrind
--19432-- Reading syms from /lib/ld-2.4.so (0x4000000)
--19432-- Reading syms from
/home/pete/src/C_tests/boost_threads_group/threadgroup (0x8048000)
--19432-- Reading syms from /usr/lib/valgrind/x86-linux/memcheck
(0x38000000)
--19432--    object doesn't have a symbol table
--19432--    object doesn't have a dynamic symbol table
--19432-- Reading suppressions file: /usr/lib/valgrind/default.supp
--19432-- REDIR: 0x4014610 (index) redirected to 0x3801CC0B (???)
--19432-- Reading syms from
/usr/lib/valgrind/x86-linux/vgpreload_core.so (0x401C000)
--19432--    object doesn't have a symbol table
--19432-- Reading syms from
/usr/lib/valgrind/x86-linux/vgpreload_memcheck.so (0x401E000)
--19432--    object doesn't have a symbol table
==19432== WARNING: new redirection conflicts with existing -- ignoring
it
--19432--     new: 0x04014610 (index     ) R-> 0x04020DCA index
--19432-- Reading syms from
/home/pete/lib/libboost_thread-gcc41-mt-d-1_35.so.1.35.0 (0x4023000)
--19432-- Reading syms from
/usr/lib/gcc/i686-pc-linux-gnu/4.1.1/libstdc++.so.6.0.8 (0x4085000)
--19432--    object doesn't have a symbol table
--19432-- Reading syms from /lib/libm-2.4.so (0x415E000)
--19432--    object doesn't have a symbol table
--19432-- Reading syms from
/usr/lib/gcc/i686-pc-linux-gnu/4.1.1/libgcc_s.so.1 (0x4182000)
--19432--    object doesn't have a symbol table
--19432-- Reading syms from /lib/libc-2.4.so (0x418D000)
--19432--    object doesn't have a symbol table
--19432-- Reading syms from /lib/librt-2.4.so (0x42A4000)
--19432--    object doesn't have a symbol table
--19432-- Reading syms from /lib/libpthread-2.4.so (0x42AD000)
--19432-- REDIR: 0x41F4E50 (memset) redirected to 0x402135B (memset)
--19432-- REDIR: 0x41F52F0 (memcpy) redirected to 0x4021106 (memcpy)
--19432-- REDIR: 0x41F4000 (rindex) redirected to 0x4020D1A (rindex)
--19432-- REDIR: 0x4131C80 (operator new(unsigned)) redirected to
0x4020872 (operator new(unsigned))
--19432-- REDIR: 0x41F0CE9 (calloc) redirected to 0x401F626 (calloc)
--19432-- REDIR: 0x4130908 (operator delete(void*)) redirected to
0x401FB95 (operator delete(void*))
--19432-- REDIR: 0x41EF06E (free) redirected to 0x401FE3D (free)
==19432== 
==19432== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 25 from
1)
--19432-- 
--19432-- supp:   25 Fedora-Core-5-hack3-ld24
==19432== malloc/free: in use at exit: 144 bytes in 1 blocks.
==19432== malloc/free: 3 allocs, 2 frees, 164 bytes allocated.
==19432== 
==19432== searching for pointers to 1 not-freed blocks.
==19432== checked 8,515,228 bytes.
==19432== 
==19432== 144 bytes in 1 blocks are possibly lost in loss record 1 of 1
==19432==    at 0x401F6A5: calloc (in
/usr/lib/valgrind/x86-linux/vgpreload_memcheck.so)
==19432==    by 0x401017A: allocate_dtv (in /lib/ld-2.4.so)
==19432==    by 0x4010224: _dl_allocate_tls (in /lib/ld-2.4.so)
==19432==    by 0x42B289F: pthread_create@@GLIBC_2.1 (in
/lib/libpthread-2.4.so)
==19432==    by 0x4050213: boost::thread::thread(boost::function0<void,
std::allocator<boost::function_base> > const&) (thread.cpp:171)
==19432==    by 0x40502F3:
boost::thread_group::create_thread(boost::function0<void,
std::allocator<boost::function_base> > const&) (thread.cpp:338)
==19432==    by 0x8048B49: main (threadgroup.cpp:12)
==19432==    by 0x41A2863: (below main) (in /lib/libc-2.4.so)
==19432==    by 0x8048A08: (within
/home/pete/src/C_tests/boost_threads_group/threadgroup)
==19432== 
==19432== LEAK SUMMARY:
==19432==    definitely lost: 0 bytes in 0 blocks.
==19432==      possibly lost: 144 bytes in 1 blocks.
==19432==    still reachable: 0 bytes in 0 blocks.
==19432==         suppressed: 0 bytes in 0 blocks.
--19432--  memcheck: sanity checks: 3 cheap, 1 expensive
--19432--  memcheck: auxmaps: 0 auxmap entries (0k, 0M) in use
--19432--  memcheck: auxmaps: 0 searches, 0 comparisons
--19432--  memcheck: SMs: n_issued      = 14 (224k, 0M)
--19432--  memcheck: SMs: n_deissued    = 0 (0k, 0M)
--19432--  memcheck: SMs: max_noaccess  = 65535 (1048560k, 1023M)
--19432--  memcheck: SMs: max_undefined = 0 (0k, 0M)
--19432--  memcheck: SMs: max_defined   = 162 (2592k, 2M)
--19432--  memcheck: SMs: max_non_DSM   = 14 (224k, 0M)
--19432--  memcheck: max sec V bit nodes:    0 (0k, 0M)
--19432--  memcheck: set_sec_vbits8 calls: 0 (new: 0, updates: 0)
--19432--  memcheck: max shadow mem size:   528k, 0M
--19432-- translate:            fast SP updates identified: 4,395 (
92.4%)
--19432-- translate:   generic_known SP updates identified: 261 (  5.4%)
--19432-- translate: generic_unknown SP updates identified: 100 (  2.1%)
--19432--     tt/tc: 6,275 tt lookups requiring 6,452 probes
--19432--     tt/tc: 6,275 fast-cache updates, 2 flushes
--19432--  transtab: new        3,126 (67,048 -> 1,127,737; ratio
168:10) [0 scs]
--19432--  transtab: dumped     0 (0 -> ??)
--19432--  transtab: discarded  0 (0 -> ??)
--19432-- scheduler: 395,790 jumps (bb entries).
--19432-- scheduler: 3/3,301 major/minor sched events.
--19432--    sanity: 4 cheap, 1 expensive checks.
--19432--    exectx: 30,011 lists, 13 contexts (avg 0 per list)
--19432--    exectx: 30 searches, 17 full compares (566 per 1000)
--19432--    exectx: 0 cmp2, 67 cmp4, 0 cmpAll

Here's the code:

#include <boost/bind.hpp>
#include <boost/thread.hpp>
#include <iostream>

void fn(void){
}

int main() {
        boost::thread_group thrd;
        thrd.create_thread(&fn);
        thrd.join_all();
}

On Sat, Jan 20, 2007 at 08:06:45PM +0100, Roland Schwarz wrote:
> Pete,
> 
> could you please post the output from your valgrind run?
> 
> Thanky you,
> Roland
> 

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