Parameter passed to pthread changes [closed] - c++

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i don't know why parameters passed to pthread changes automatically.
i'll show you my code
the debug result is this :
begin of while while() =begin= 0 ===
params: a84a5310
->socket: a84a4e70
->connection: a84a52d0(4)
->webserver: a84a4ea0(0)
===== begin of while while() =end====
===== end of while() =begin= 1709692672 ===
params: a84a5310
->socket: a84a4e70
->connection: a84a52d0(4)
->webserver: a84a4ea0(0)
===== end of while() =end====
Accepting...
===== in thread() =begin= 1709692672 ===
params: aacf4240//wrong expected a84a5310
->socket: a84a5310 //wrong expected a84a4e70
->connection: a84a4ea0(0)//wrong expected a84a52d0(4)
->webserver: 65e7d700(0) //wrong expected a84a4ea0(0)
===== in thread() =end====
this is struct that i pass to the thread :
typedef struct InfoServer{
ServerTCP* server;
WebServer* webserver;
ConnServer* serverConn;
}ServerInfo;
this is debug function :
void* show_params(ServerInfo* params, char* where, int n) {
printf("===== %s =begin= %d ===\n",where, n);
printf("params: %x\n",
params);
printf("->socket: %x\n",
params->server);
printf("->connection: %x(%d)\n",
params->serverConn, params->serverConn->getConn());
printf("->webserver: %x(%d)\n",
params->webserver);
printf("===== %s =end====\n",where);
fflush(stdout);
}
this is main function :
void *manageConnection(void *serverConn);
void fineRichiesta(ServerInfo * serverinformation);
int main (int argc , char* argv[]){
if(argc!=2){
printf("USAGE: %S , PORT \n",argv[0]);
fflush(stdout);
exit(1);
}
int port = atoi(argv[1]);
ServerTCP* tserver= new ServerTCP(port);
WebServer* webserv= new WebServer();
bool exit = false;
while( true ){
pthread_t manageConnection_thread;
ConnServer* serverC= tserver->acceptConn();
ServerInfo* serverinfo = (ServerInfo*) malloc(sizeof(ServerInfo));
serverinfo->server = tserver;
serverinfo->webserver = webserv;
serverinfo->serverConn =serverC;
show_params(serverinfo,"starting in while()",0);
if(pthread_create(&manageConnection_thread,
NULL,
manageConnection,
(void*) &serverinfo)) {
error("Error Creating server");
}
show_params(serverinfo,"end of while()", manageConnection_thread);
}
delete( tserver);
delete( webserv);
return 0;
}
here is thread code :
void *manageConnection(void * serverinformation){
ServerInfo *serverinfo = (ServerInfo*)serverinformation;
show_params(serverinfo,"in thread()", pthread_self());
ConnServer * srvConn = serverinfo->serverConn;
char* answ;
if(srvConn){
answ = (char*)srvConn->riceviServer();
}
else {
printf("im in else\n");
fflush(stdout);
}
if(!answ){
printf("finerichiesta\n");
fflush(stdout);
fineRichiesta(serverinfo);
}
printf("answ: %s\n", answ);
fflush(stdout);
char* file = serverinfo->webserver->getFile(answ);
srvConn->inviaServer(file);
fineRichiesta( serverinfo);
free(answ);
return NULL;
}
function :
void fineRichiesta(ServerInfo * serverinformation){
printf("im in fine richiesta\n");
fflush(stdout);
serverinformation->server->disconnect(serverinformation->serverConn);
free(serverinformation);
pthread_exit(NULL);
}
Any help would be amazing , im getting crazy -
i dont know if my question is best formulated -
thanks in advance ...

Answer 1

Your pthread_create call is passing the wrong void * value to the thread start routine manageConnection.
It is passing the address of the serverInfo variable:
pthread_create(&manageConnection_thread,
NULL,
manageConnection,
(void*) &serverinfo)
It should be passing value of the serverInfo variable, which points to a filled in ServerInfo:
pthread_create(&manageConnection_thread,
NULL,
manageConnection,
(void*) serverinfo) // <-- note: ampersand removed here