pthread_create tid?

Hi, I got a problem with pthread_create

code:

Code:

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pthread_t tid1;
pthread_create(&tid1, NULL, thread1, (void *)tst);
printf("tid: %d\n", tid1);

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According to the man page of pthread_create the tid gets stored in tid1, but when I try and print it out I only get like -1204387023 something, instead of the correct tid of the thread I just created?

Are you sure that the large negative number ISN'T the tid that you just created - what says that it has to be a small integer? Although, I have to admit that the hex version makes just as little sense: 0xB8368331

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Mats

Im sure, when I print out the tid from within the new thread, using:

Code:

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int i = syscall(SYS_gettid);

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I get a low nice nr like 4506

Thing is I need this tid in the main thread when I create the child thread.

Interesting ... if I reserver memory for the tid1 I get a positive BIG number AND its the same every time I run the program, while tid2 gets a BIG negative number, which is different every time??

Code:

Code:

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pthread_t *tid1, tid2;

tid1 = (pthread_t *)malloc((sizeof(pthread_t)));
pthread_create(tid1, NULL, thread1, (void *)tst);
printf("tid1: %d\n", tid1);

pthread_create(&tid2, NULL, thread2, (void *)tid2);
printf("tid2: %d\n", tid2);

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gives:
tid1: 134529032
tid2: -1218405488

tid1: 134529032
tid2: -1218954352

tid1: 134529032
tid2: -1218651248

Anyone that can explain for me? I want the tid of the thread I'm creating, when I create it. Can I pick it out in someway of this values?

Perhaps you want to print *tid1 instead? Right now you are printing the address of your thread ID, which is pretty much guaranteed to be different from the ID itself - I suspece the ID itself is an address to some sort of internal data-structure - but it's probably not visible to you.

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Mats

Quote:

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some sort of internal data-structure - but it's probably not visible to you

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Thats correct. :(
A well have to use gettid() from within the threads then ...