Peeking, Unix Sockets & Threads

Peeking at received data:

PeekServer.c & PeekClient.c

Peek:
 cc = recv(fd, buf, sizeof buf, MSG_PEEK);

Read:

cc = recv(fd, buf, sizeof buf,0);

Unix domain sockets:

Stream

unixstrcli01.c & unixstrserv01c

The client and server communicate via the common file:

#define UNIXSTR_PATH "/tmp/unix.str"

Datagram

unixdgcli01.c & unixdgserv01.c

The client and server communicate via the common file:

#define UNIXDG_PATH "/tmp/unix.dg"

---

Threads

(see chapter 23)

Functions:

· pthread_create  (ThreadID, Priority, Starting Fun, Fun Args)

· pthread_join // similar to waitpid

· pthread_self // similar to getpid

· pthread_detach // not joinable

· pthread_exit // terminate a thread;

// calling exit() kills ALL threads.

Simple Exampls:

tcpcli01.c uses (strclithread.c)  &  tcpserv01.c

Synchronization:

Ø non-synch example: example01.c

use: % script file
        % example01
        % look at file to see the problem

Ø synchronized example: example02.c

It uses:

Pthread_mutex_lock()

{ Critical Section}

Pthread_mutex_unlock()