Hi, folks,
Recently I downloaded a C++ threading library ZThread
2.3.1 based pthread from zthread.sourceforge.net. The
compilation and installation were smooth. But when I
used a very simiple test program 'MyThread' to try
this library, I found out that the dynamically linked
program cannot exit after all threads finish, but the
statically linked program has no such problem. And if
I use LD_ASSUME_KERNEL=2.4.19 to run the dynamical
version, the program can exit normally. On my Redhat
Enterprise Linux 3.0 (ES) system, I found out that
normally the program will use /lib/tls/libpthread.so.0
which causes the problem, and by using
LD_ASSUME_KERNEL=2.4.19, the program uses
/lib/libpthread-0.10.so which does not cause any
problem, plus the statically linked program using
/usr/lib/libpthread.a works fine too!
I am wondering what are the possible causes for this
problem? and how to fix it? Any information is greatly
appreciated! Thanks a lot!
*** System infomrations ***
All those pthread library files belong to the glibc
and glibc-devel 2.3.2-95.20. My linux kernel is Redhat
2.4.21-15, my GCC options are:
Reading specs from
/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/specs
Configured with: ../configure --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--enable-shared --enable-threads=posix
--disable-checking --with-system-zlib
--enable-__cxa_atexit --host=i386-redhat-linux
Thread model: posix
gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-39)
/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/cc1plus -v
-D__GNUC__=3 -D__GNUC_MINOR__=2
-D__GNUC_PATCHLEVEL__=3 -D__GXX_ABI_VERSION=102
-D__ELF__ -Dunix -D__gnu_linux__ -Dlinux -D__ELF__
-D__unix__ -D__gnu_linux__ -D__linux__ -D__unix
-D__linux -Asystem=posix -D__NO_INLINE__
-D__STDC_HOSTED__=1 -D_GNU_SOURCE -Acpu=i386
-Amachine=i386 -Di386 -D__i386 -D__i386__
-D__tune_i386__ foo.C -D__GNUG__=3 -D__DEPRECATED
-D__EXCEPTIONS -quiet -dumpbase foo.C -version -o
/tmp/ccJD4yWX.s
GNU CPP version 3.2.3 20030502 (Red Hat Linux
3.2.3-39) (cpplib) (i386 Linux/ELF)
GNU C++ version 3.2.3 20030502 (Red Hat Linux
3.2.3-39) (i386-redhat-linux)
compiled by GNU C version 3.2.3 20030502 (Red
Hat Linux 3.2.3-39).
ignoring nonexistent directory
"/usr/i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/3.2.3
/usr/include/c++/3.2.3/i386-redhat-linux
/usr/include/c++/3.2.3/backward
/usr/local/include
/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/include
/usr/include
End of search list.
as -V -Qy -o /tmp/ccwWhY9O.o /tmp/ccJD4yWX.s
GNU assembler version 2.14.90.0.4 (i386-redhat-linux)
using BFD version 2.14.90.0.4 20030523
/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/collect2
--eh-frame-hdr -m elf_i386 -dynamic-linker
/lib/ld-linux.so.2
/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/../../../crt1.o
/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/../../../crti.o
/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/crtbegin.o
-L/usr/lib/gcc-lib/i386-redhat-linux/3.2.3
-L/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/../../..
/tmp/ccwWhY9O.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s
-lgcc
/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/crtend.o
/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/../../../crtn.o
===============================================
The source code of 'MyThread.cpp' is:
#include <iostream>
#include <cmath>
#include <zthread/Thread.h>
#include <zthread/Runnable.h>
using namespace std;
using namespace ZThread;
class MyThread : public Runnable
{
int id;
unsigned long delaying;
public:
MyThread(int ident = 0, unsigned long delay =
500000L)
{
id = ident;
delaying = delay;
cout << "Thread #" << id << ": " << "running" <<
endl;
}
~MyThread()
{
cout << "Thread #" << id << " completed" << endl;
}
void run()
{
double sum = 0.0;
for(long i = 0; i < delaying; ++i) sum +=
sin(sqrt(log((double)(i+1))));
}
};
int main(void)
{
int n_threads;
cout << "How many threads do you want: ";
cin >> n_threads;
try
{
for(int i = 0; i < n_threads; ++i) Thread t(new
MyThread(i, 500000L));
} catch(Synchronization_Exception& e)
{
cerr << e.what() << endl;
}
cout << "Done!" << endl;
}
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