leak memory when thread exit Post: 302276033

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Top Forums Programming leak memory when thread exit Post 302276033 by Frank2004 on Tuesday 13th of January 2009 01:06:29 AM

01-13-2009

Registered User

leak memory when thread exit

In our concurrent tcp server program, once the connection comes, the program create a thread to process acception. When the client exit, the server closed socket and the thread exited, the problem is the memory can not release normally. The code looks like the followings:

Code:

main()
{       
    .......
 
    while(1==1)
                {
                        channel=srv_accept(sockfd,(struct sockaddr *)&tcp_cli_addr,&length);
                        if(channel<0)
                        {
                                //cout<<"channel ="<<channel<<" retry srv_accept ...."<<endl;
                                continue;
                        }
                        num=-1; 
                       // find the nonused pthread number.
                        for(int i=0;i<MAX_REPORT_NUM;i++)
                                {       
                                        if(pth_struct[i].flag<0)
                                        {       
                                                num=i;
                                                break;
                                        }
                                }
                        printf("num is %d \n",num);
                        for(int i=0;i<MAX_REPORT_NUM;i++)
                                {       
                                        printf("....pos=%d flag=%d ......\n",i,pth_struct[i].flag);
                                }
                        if(num<0)
                        {       
                                Tcp_close(channel);
                                continue;
                        }
                        pthch[num].channel=channel;
                        pthch[num].pos=num;
                        pth_struct[num].flag=1;
                         
                       pthread_create(&pth_struct[num].pthread_no,&attr,(pthread_startroutine_t)channel_handler,

(pthread_addr_t *)&pthch[num]);
        }

}

int  channel_handler(struct  pthname_channel *recv_s=NULL)// handling the tcp message.
{
      .......
       while(1==1)
        {
                ret=Tcp_read(recv_s->channel,(char *)&ptr,sizeof(struct  MESS_BLOCK));
                if(ret<=0)
                {       
                        printf("@@@@@@@@@@@@ ------ Tcp_read err : ---------- @@@@@@@@@@@@@  \n");
                        fflush(stdout);
                        Tcp_close(recv_s->channel);
                        pth_struct[recv_s->pos].flag=-1;
                        
                        tid = pthread_self();
                        pthread_detach((pthread_t *)&tid);
                        pthread_exit(0);
                        break;
                }
            // processing packets .
}

We wants the program can free the thread resource normally once the connection closed and thread exit, otherwise the memory block become bigger with the thread creating, any suggestion?

Frank2004

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iv_thread

iv_thread(3)						    ivykis programmer's manual						      iv_thread(3)

NAME

       iv_thread_create, iv_thread_set_debug_state - ivykis thread convenience functions

SYNOPSIS

       #include <iv_thread.h>

       int iv_thread_create(char *name, void (*start_routine)(void *), void *arg);
       void iv_thread_set_debug_state(int state);

DESCRIPTION

       iv_thread_create  is a wrapper around pthread_create(3) which will maintain an ivykis main loop reference in the calling thread (which must
       be an ivykis(3) thread, i.e. have had iv_init(3) called in it) for as long as the created thread is alive.

       Maintaining a reference on the calling thread's ivykis event loop makes sure that the calling thread will not return from its  ivykis  main
       loop  before the created thread exits, as that could cause cleanup still happening in the created thread to be interrupted when the calling
       thread subsequently calls exit(3).

       The created thread need not be an ivykis thread.

       Enabling debugging by calling iv_thread_set_debug with a nonzero argument will print a debug message to standard error whenever a thread is
       created	via  iv_thread_create,	whenever  a  thread so created terminates normally by returning from its start_routine, self-terminates by
       calling pthread_exit(3), or is successfully canceled by pthread_cancel(3), and whenever destruction of such a thread is	signaled  back	to
       the calling thread.

       For inter-thread signaling, iv_thread uses iv_event(3).

SEE ALSO

       ivykis(3), iv_event(3), exit(3), pthread_cancel(3), pthread_create(3), pthread_exit(3)

ivykis								    2010-09-13							      iv_thread(3)