On Wed, Sep 8, 2010 at 5:02 PM, Ivan S. Lyapunov <[email protected]> wrote:
> Hello.
>
> I'm writed a simple pthreads program and can't understand Valgrind
> output because thre is no error in my case I think ;)
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <pthread.h>
>
> extern "C" {
>
> void * run_handle(void * param) {
> printf("tra-la-la\n");
> return 0;
> }
> }
>
> int main(int argc, char** argv) {
> pthread_t t;
> pthread_create(&t, 0, run_handle, 0);
>
> sleep(10);
> return 0;
> }
>
>
> compile it
> gcc ./main.cpp -o main -pthread -D_REENTRANT -D_THREAD_SAFE -lpthread
>
As the first step, try adding "-g" to the compile command.
--kcc
>
> and valgrind
> valgrind --tool=helgrind -v ./main
>
> ArchLinux, i686, valgrind-3.5.0
>
> why there is errors?
>
> ==12868== Helgrind, a thread error detector
> ==12868== Copyright (C) 2007-2009, and GNU GPL'd, by OpenWorks LLP et
> al. ==12868== Using Valgrind-3.5.0 and LibVEX; rerun with -h for
> copyright info ==12868== Command: ./main
> ==12868==
> --12868-- Valgrind options:
> --12868-- --tool=helgrind
> --12868-- -v
> --12868-- Contents of /proc/version:
> --12868-- Linux version 2.6.35-ARCH (tob...@t-powa-lx) (gcc version
> 4.5.1 (GCC) ) #1 SMP PREEMPT Fri Aug 27 16:22:18 UTC 2010 --12868--
> Arch and hwcaps: X86, x86-sse1-sse2 --12868-- Page sizes: currently
> 4096, max supported 4096 --12868-- Valgrind library
> directory: /usr/lib/valgrind --12868-- Reading syms
> from /lib/ld-2.12.1.so (0x4000000) --12868-- Reading syms
> from /home/dront/Develop/git/crossplatform/FoundationTest/main
> (0x8048000) --12868-- Reading syms
> from /usr/lib/valgrind/helgrind-x86-linux (0x38000000) --12868--
> object doesn't have a symbol table --12868-- object doesn't have a
> dynamic symbol table --12868-- Reading suppressions
> file: /usr/lib/valgrind/default.supp --12868-- Reading syms
> from /usr/lib/valgrind/vgpreload_core-x86-linux.so (0x401f000)
> --12868-- Reading syms
> from /usr/lib/valgrind/vgpreload_helgrind-x86-linux.so (0x4021000)
> --12868-- REDIR: 0x4016c20 (index) redirected to 0x4027650 (index)
> --12868-- REDIR: 0x4016dc0 (strlen) redirected to 0x4027730 (strlen)
> --12868-- Reading syms from /lib/libpthread-2.12.1.so (0x404e000)
> --12868-- Reading syms from /lib/libc-2.12.1.so (0x4068000)
> --12868-- object doesn't have a symbol table --12868-- REDIR:
> 0x40dc300 (index) redirected to 0x40275d0 (index) --12868-- REDIR:
> 0x40540b0 (pthread_create@@GLIBC_2.1) redirected to 0x40252f0
> (pthread_cre...@*) --12868-- REDIR: 0x40d9c20 (calloc) redirected to
> 0x40232f0 (calloc) --12868-- REDIR: 0x40dc9d0 (strlen) redirected to
> 0x4027710 (strlen) tra-la-la ==12868== Thread #1 is the program's root
> thread ==12868== ==12868== Thread #2 was created ==12868== at
> 0x41371F8: clone (in /lib/libc-2.12.1.so) ==12868== by 0x4054425:
> pthread_create@@GLIBC_2.1 (in /lib/libpthread-2.12.1.so) ==12868==
> by 0x40251E1: pthread_create_WRK
> (in /usr/lib/valgrind/vgpreload_helgrind-x86-linux.so) ==12868== by
> 0x80484D9: main
> (in /home/dront/Develop/git/crossplatform/FoundationTest/main)
> ==12868== ==12868== Possible data race during read of size 4 at
> 0xbe87819c by thread #1 ==12868== at 0x40251EF: pthread_create_WRK
> (in /usr/lib/valgrind/vgpreload_helgrind-x86-linux.so) ==12868== by
> 0x80484D9: main
> (in /home/dront/Develop/git/crossplatform/FoundationTest/main)
> ==12868== This conflicts with a previous write of size 4 by thread #2
> ==12868== at 0x40252C9: mythread_wrapper
> (in /usr/lib/valgrind/vgpreload_helgrind-x86-linux.so) ==12868== by
> 0x4053E5F: start_thread (in /lib/libpthread-2.12.1.so) ==12868== by
> 0x413720D: clone (in /lib/libc-2.12.1.so) ==12868== --12868-- REDIR:
> 0x40d9160 (free) redirected to 0x4023da0 (free) --12868-- REDIR:
> 0x40561f0 (pthread_mutex_lock) redirected to 0x4025680
> (pthread_mutex_lock) --12868-- REDIR: 0x40577c0 (pthread_mutex_unlock)
> redirected to 0x4025a60 (pthread_mutex_unlock) ==12868== ==12868==
> ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 23 from 23)
> ==12868== ==12868== 1 errors in context 1 of 1: ==12868== Possible data
> race during read of size 4 at 0xbe87819c by thread #1 ==12868== at
> 0x40251EF: pthread_create_WRK
> (in /usr/lib/valgrind/vgpreload_helgrind-x86-linux.so) ==12868== by
> 0x80484D9: main
> (in /home/dront/Develop/git/crossplatform/FoundationTest/main)
> ==12868== This conflicts with a previous write of size 4 by thread #2
> ==12868== at 0x40252C9: mythread_wrapper
> (in /usr/lib/valgrind/vgpreload_helgrind-x86-linux.so) ==12868== by
> 0x4053E5F: start_thread (in /lib/libpthread-2.12.1.so) ==12868== by
> 0x413720D: clone (in /lib/libc-2.12.1.so) ==12868== --12868-- --12868--
> used_suppression: 23 helgrind-glibc2X-004 ==12868== ==12868== ERROR
> SUMMARY: 1 errors from 1 contexts (suppressed: 23 from 23)
>
>
>
> cat /proc/cpuinfo
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 15
> model : 2
> model name : Intel(R) Pentium(R) 4 CPU 3.06GHz
> stepping : 7
> cpu MHz : 3066.602
> cache size : 512 KB
> physical id : 0
> siblings : 2
> core id : 0
> cpu cores : 1
> apicid : 0
> initial apicid : 0
> fdiv_bug : no
> hlt_bug : no
> f00f_bug : no
> coma_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 2
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr
> pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
> pebs bts cid bogomips : 6135.75 clflush size : 64
> cache_alignment : 128
> address sizes : 36 bits physical, 32 bits virtual
> power management:
>
> processor : 1
> vendor_id : GenuineIntel
> cpu family : 15
> model : 2
> model name : Intel(R) Pentium(R) 4 CPU 3.06GHz
> stepping : 7
> cpu MHz : 3066.602
> cache size : 512 KB
> physical id : 0
> siblings : 2
> core id : 0
> cpu cores : 1
> apicid : 1
> initial apicid : 1
> fdiv_bug : no
> hlt_bug : no
> f00f_bug : no
> coma_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 2
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr
> pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
> pebs bts cid bogomips : 6135.53 clflush size : 64
> cache_alignment : 128
> address sizes : 36 bits physical, 32 bits virtual
> power management:
>
>
> Regards,
> Ivan
>
>
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