Prb avec les thread en c

Bonjour,

j'ai un petit probleme avec les thread en c j'ai un fichier serveur qui accepte les connections client, achaque connection le programme lui alloue un processus.
si un seul client se connect pas de probleme et si 2 client connecte au meme temps ya un probleme, je crois qu'ils accede a la meme variable ou je ne sais pas quoi
voisi a bout de mon programme serveur:

#include "messgH.h"
#include "entet.h"
#include<stdio.h>
#include<stdlib.h>
#include<pthread.h>

#include "pvm3.h" /* pvm3 header file */
#include <stdio.h>

#include <string.h>
#include <time.h>
#define BACKLOG (100) // Max. request backlog

struct Namespace *namespaces;

int main(int argc, char **argv)
{

struct soap v_soap;
soap_init(&v_soap);
soap_set_namespaces( &v_soap, messg_namespaces );
v_soap.send_timeout = 3660; // 3660 seconds
v_soap.recv_timeout = 3660; // 3660 seconds
v_soap.accept_timeout = 3600; // server stops after 1 hour of inactivity
v_soap.max_keep_alive = 100; // max keep-alive sequence
void *process_request(void*);
struct soap *tsoap;
pthread_t tid;
int port = 8060; // first command-line arg is port
SOAP_SOCKET m, s;
m = soap_bind(&v_soap, NULL, port, BACKLOG);
if (!soap_valid_socket(m))
exit(1);
fprintf(stderr, "Socket connection successful %d\n", m);
for (;;)
{
s = soap_accept(&v_soap);
if (!soap_valid_socket(s))
{
if (v_soap.errnum)
{
soap_print_fault(&v_soap, stderr);
exit(1);
}
fprintf(stderr, "server timed out\n");
break;
}
fprintf(stderr, "Thread * accepts socket %d connection from IP %d.%d.%d.%d\n", s, (v_soap.ip >> 24)&0xFF, (v_soap.ip >> 16)&0xFF, (v_soap.ip >> 8)&0xFF, v_soap.ip&0xFF);
tsoap = soap_copy(&v_soap); // make a safe copy
// process_request ((void*)tsoap);
if (!tsoap)
break;
pthread_create(&tid, NULL, process_request, tsoap);
}

soap_done(&v_soap); // detach soap struct
return 0;
}
void *process_request(void *soap)
{

pthread_detach(pthread_self());

messg_serve((struct soap*)soap);
printf("Socket connec;,:tion successful \n");
soap_destroy((struct soap*)soap); // dealloc C++ data
soap_end((struct soap*)soap); // dealloc data and clean up
soap_done((struct soap*)soap); // detach soap struct
free(soap);
return NULL;
}



je recois cette erreur au niveau du serveur:



[1]+ Segmentation fault ./serveur
</gras>

merci d'avance