Deliver values to Thread function Post: 302804197

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Top Forums Shell Programming and Scripting Deliver values to Thread function Post 302804197 by jimm_the_h on Wednesday 8th of May 2013 07:06:58 AM

05-08-2013

Registered User

Deliver values to Thread function

Hello,
I hope you can help me with my problem.
I've written a programm which creates a thread. The main programmm creates 10 int and float values. The fucnction should give the values out.
May big problem ist that the delivery to the function is not working.
Where ist my fault?
How can I make easier?
Thank you for your help.

Code:

void funktion1 (void *arg1)
{
	
	printf("Int-Zahl= %i",arg1);
	printf("[TID:%li,PPID:%i] Threadfunktion1 \n",syscall(SYS_gettid),getppid() );
	pthread_exit(NULL);
}

int main()
{	
	struct Zahlen{int z1;float z2;};

	struct Zahlen Zahl;

	pthread_t ptr1, ptr2, ptr3;
	int res1;
	int res2; 
	int bes1;
	int bes2;


	// reine Threadzeile
	res1 = pthread_create(&ptr1, NULL, (void *)&funktion1,(void *)Zahl.z1);

	//Fehlerabfrage Thread3
		if(res1 != 0)
	{
		perror("Thread creation failed!");
	}
	int i;	
	for(i = 0; i<=10;i++)
	{
		Zahl.z1 = random() % 100; //Int Zahl 1-100 erzeugt
		Zahl.z2 =(float)rand() / RAND_MAX; //Float Zahl 0-1 erteugt
		printf("[TID: %li, PID: %i]int-Wert: %i  float-Wert: %f \n",syscall(SYS_gettid), getpid(), Zahl.z1, Zahl.z2);
	}
	bes1 = pthread_join(&ptr1, NULL);
	
	/*if (bes1  !=0) 
		{ 
			perror("Thread join failed");		
			exit(1); 
		}
	return 0;
}

Last edited by Scott; 05-08-2013 at 11:21 AM.. Reason: Please use code tags

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LEARN ABOUT MINIX

pthread_detach

PTHREAD_DETACH(3)					     Linux Programmer's Manual						 PTHREAD_DETACH(3)

NAME

       pthread_detach - detach a thread

SYNOPSIS

       #include <pthread.h>

       int pthread_detach(pthread_t thread);

       Compile and link with -pthread.

DESCRIPTION

       The  pthread_detach()  function	marks  the  thread identified by thread as detached.  When a detached thread terminates, its resources are
       automatically released back to the system without the need for another thread to join with the terminated thread.

       Attempting to detach an already detached thread results in unspecified behavior.

RETURN VALUE

       On success, pthread_detach() returns 0; on error, it returns an error number.

ERRORS

       EINVAL thread is not a joinable thread.

       ESRCH  No thread with the ID thread could be found.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +-----------------+---------------+---------+
       |Interface	 | Attribute	 | Value   |
       +-----------------+---------------+---------+
       |pthread_detach() | Thread safety | MT-Safe |
       +-----------------+---------------+---------+

CONFORMING TO

       POSIX.1-2001, POSIX.1-2008.

NOTES

       Once a thread has been detached, it can't be joined with pthread_join(3) or be made joinable again.

       A new thread can be created in a detached state using pthread_attr_setdetachstate(3) to set the detached attribute of the attr argument	of
       pthread_create(3).

       The  detached  attribute merely determines the behavior of the system when the thread terminates; it does not prevent the thread from being
       terminated if the process terminates using exit(3) (or equivalently, if the main thread returns).

       Either pthread_join(3) or pthread_detach() should be called for each thread that an application creates, so that system resources  for  the
       thread  can  be	released.  (But note that the resources of any threads for which one of these actions has not been done will be freed when
       the process terminates.)

EXAMPLE

       The following statement detaches the calling thread:

	   pthread_detach(pthread_self());

SEE ALSO

       pthread_attr_setdetachstate(3), pthread_cancel(3), pthread_create(3), pthread_exit(3), pthread_join(3), pthreads(7)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15							 PTHREAD_DETACH(3)

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