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Full Discussion: Help with pthread error
Top Forums Programming Help with pthread error Post 302483610 by SuperStout on Monday 27th of December 2010 10:28:35 PM
Old 12-27-2010
Help with pthread error
I have written a C code and when i compile it there are 0 warnings and 0 errors, but when i try to run apears:

Code:
./client: symbol lookup error: ./client: undefined symbol: pthread_create, version GLIBC_2.1

the part of the code where i have the pthread_creat is:

Code:
int serverConection(int socket, int number){
    char buffer[SIZE];
    int recvd;
    pthread_t thread;
    DATA tdata;

    recvd = receivFile(socket, number);
    if(recvd != 0) return -1;
    if(send(socket,&number,sizeof(int),0) <= 0)return -1;
    
    while(recv(socket,buffer,SIZE,0)){
        buffer[strlen(buffer)-1] = '\0';
        
        if(strcmp(buffer,"STARTPLAY")){
                    tdata->wait = 0;
                    tdata->period = 45454;
                    tdata->number = number;
                    //pthread_create(&thread,NULL,clientConnect,(void *)auxSocket);    
                    pthread_create(&thread,NULL,showBanner,&tdata);
        }        
    }
    return 0;
}

i don't understand what's happening i have already used this function many times and this is the first time this happened, i really need some help.
thx
 

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LEARN ABOUT NETBSD

pthread_join

PTHREAD_JOIN(3) 					   BSD Library Functions Manual 					   PTHREAD_JOIN(3)

NAME

     pthread_join -- wait for thread termination

LIBRARY

     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

     #include <pthread.h>

     int
     pthread_join(pthread_t thread, void **value_ptr);

DESCRIPTION

     The pthread_join() function suspends execution of the calling thread until the target thread terminates unless the target thread has already
     terminated.

     On return from a successful pthread_join() call with a non-NULL value_ptr argument, the value passed to pthread_exit() by the terminating
     thread is stored in the location referenced by value_ptr.	When a pthread_join() returns successfully, the target thread has been terminated.
     The results of multiple simultaneous calls to pthread_join() specifying the same target thread are undefined.  If the thread calling
     pthread_join() is cancelled, then the target thread is not detached.

     A thread that has exited but remains unjoined counts against _POSIX_THREAD_THREADS_MAX.

RETURN VALUES

     If successful,  the pthread_join() function will return zero.  Otherwise an error number will be returned to indicate the error.

ERRORS

     pthread_join() shall fail if:

     [EINVAL]		The value specified by thread does not refer to a joinable thread.

     [ESRCH]		No thread could be found corresponding to that specified by the given thread ID, thread.

     pthread_join() may fail if:

     [EDEADLK]		A deadlock was detected or the value of thread specifies the calling thread.

SEE ALSO

     wait(2), pthread_create(3)

STANDARDS

     The function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

BSD
								   July 9, 2010 							       BSD
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