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Full Discussion: undefined reference to `pthread_create'
Top Forums Programming undefined reference to `pthread_create' Post 95142 by netman on Friday 6th of January 2006 10:52:41 PM
Old 01-06-2006
undefined reference to `pthread_create'
Hi

I wanted to learn communication between threads and I used a simple example but
I faced with this error while I have a sofware that uses this functions without
any problem
so would you please help me to know the reason
thanks for your help and great favor.

#include <pthread.h>
#include <stdio.h>




void *hello_world (void *arg)
{

printf ("Hello world\n");
return NULL;
}

int main (int argc, char *argv[])
{
pthread_t hello_id;
int status;

status = pthread_create (&hello_id, NULL, hello_world, NULL);
if (status != 0)
//err_abort (status, "Create thread");
status = pthread_join (hello_id, NULL);
if (status != 0)
// err_abort (status, "Join thread");
return 0;
}



/tmp/cceZX3sJ.o(.text+0x47): In function `main':
: undefined reference to `pthread_create'
/tmp/cceZX3sJ.o(.text+0x60): In function `main':
: undefined reference to `pthread_join'
collect2: ld returned 1 exit status

I had one more question
I read in docs that when the parent thread terminates the child threads would be terminated too
but we can change the priority of a thread so is it possible to give a thread a priority more
than parent's. and can a parent terminates one of its child that has priority more or equal to its priority?

thanks

Best Regards.
 

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LEARN ABOUT NETBSD

pthread_create

PTHREAD_CREATE(3)					   BSD Library Functions Manual 					 PTHREAD_CREATE(3)

NAME

     pthread_create -- create a new thread

LIBRARY

     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

     #include <pthread.h>

     int
     pthread_create(pthread_t * restrict thread, const pthread_attr_t * restrict attr, void *(*start_routine)(void *), void * restrict arg);

DESCRIPTION

     The pthread_create() function is used to create a new thread, with attributes specified by attr, within a process.  If attr is NULL, the
     default attributes are used.

     The attributes specified via attr are copied into the new thread.	Any subsequent modifications to the attributes object attr points to will
     have no effect upon already-created threads.  It is thus also safe to pass the same attr to multiple calls to pthread_create().

     Upon successful completion pthread_create() will store the ID of the created thread in the location specified by thread.  The thread is cre-
     ated executing start_routine with arg as its sole argument.

     If the start_routine returns, the effect is as if there was an implicit call to pthread_exit() using the return value of start_routine as the
     exit status.  Note that the thread in which main() was originally invoked differs from this.  When it returns from main(), the effect is as
     if there was an implicit call to exit() using the return value of main() as the exit status.

     The signal state of the new thread is initialized as:

	   o   The signal mask is inherited from the creating thread.

	   o   The set of signals pending for the new thread is empty.

RETURN VALUES

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

ERRORS

     pthread_create() shall fail if:

     [EAGAIN]		The system lacks the necessary resources to create another thread, or the system-imposed limit on the total number of
			threads in a process PTHREAD_THREADS_MAX would be exceeded.

     [EINVAL]		The value specified by attr is invalid.

SEE ALSO

     fork(2), pthread_attr(3), pthread_cleanup_pop(3), pthread_cleanup_push(3), pthread_exit(3), pthread_join(3)

STANDARDS

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

BSD
								   July 9, 2010 							       BSD
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