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Old 09-16-2004, 08:21 AM   #1
mmiglia
LQ Newbie
 
Registered: Sep 2004
Posts: 2

Rep: Reputation: 0
what's the difference between libpthread.so and libpthread.a?


Hi to everyone.
I know the short answer dynamic vs static linking, however, I need a deeper answer because I have a short, stupid test program that works as expected when dynamically linked while sigsegv inside pthread_create when statically linked.

What more?

here is the source

#include <iostream>
#include <unistd.h>
#include <pthread.h>

using namespace std;

void *run(void *arg)
{
cout << "Io sono in run\n";
int i = 0;
while(1)
{
cout << "io sono il thread " << i++ << "\n";
sleep(1);
}
}

int main(int argc, char** argv)
{
int i = 0;
for(i=1;i<argc;i++)
{
cout << argv[i] << "\n";
}
pthread_t *ilThread = (pthread_t*)malloc(sizeof(pthread_t));

cout << "Crea il thread...\n";
cout << "Crea il thread ma per davvero...\n";

cout << pthread_create(ilThread, (pthread_attr_t*)NULL, run, (void*)NULL) << "\n";

cout << "Creato il thread, entro in loop\n";

while(1)
{
cout << "io sono il main " << i++ << "\n";
sleep(1);
}
}


The distribution is fedora release 2 (kernel 2.6)

The compile command that works is:
g++ hello.cpp -lpthread -o hello

The one that does not is:
g++ hello.cpp -static -lpthread -o hello

Thanks in advance and best regards

--Mauro
 
Old 09-16-2004, 08:53 AM   #2
rjlee
Senior Member
 
Registered: Jul 2004
Distribution: Ubuntu 7.04
Posts: 1,990

Rep: Reputation: 67
It would appear that this is a bug with the static version of the libraries, caused by using a vfork instead of a fork (for whatever reason).

Ref: http://sources.redhat.com/ml/bug-gli.../msg00120.html
 
  


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