Example: Setting a thread attribute in a Pthread program
This example shows how to set the detach state thread attribute in a Pthread program.
Note: By using the code examples, you agree to the terms of the Code license and disclaimer information.
/*
Filename: ATEST10.QCSRC
The output of this example is as follows:
Enter Testcase - LIBRARY/ATEST10
Create a default thread attributes object
Set the detach state thread attribute
Create a thread using the new attributes
Destroy thread attributes object
Join now fails because the detach state attribute was changed
Entered the thread
Main completed
*/
#define _MULTI_THREADED
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define checkResults(string, val) { \
if (val) { \
printf("Failed with %d at %s", val, string); \
exit(1); \
} \
}
void *theThread(void *parm)
{
printf("Entered the thread\n");
return NULL;
}
int main(int argc, char **argv)
{
pthread_attr_t attr;
pthread_t thread;
int rc=0;
printf("Enter Testcase - %s\n", argv[0]);
printf("Create a default thread attributes object\n");
rc = pthread_attr_init(&attr);
checkResults("pthread_attr_init()\n", rc);
printf("Set the detach state thread attribute\n");
rc = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
checkResults("pthread_attr_setdetachstate()\n", rc);
printf("Create a thread using the new attributes\n");
rc = pthread_create(&thread, &attr, theThread, NULL);
checkResults("pthread_create()\n", rc);
printf("Destroy thread attributes object\n");
rc = pthread_attr_destroy(&attr);
checkResults("pthread_attr_destroy()\n", rc);
printf("Join now fails because the detach state attribute was changed\n");
rc = pthread_join(thread, NULL);
if (rc==0) {
printf("Unexpected results from pthread_join()\n");
exit(1);
}
sleep(2);
printf("Main completed\n");
return 0;
}