PTHREAD_EQUAL(3) Library Functions Manual PTHREAD_EQUAL(3)

pthread_equal — compare thread IDs


#include <pthread.h>

int pthread_equal(pthread_t t1, pthread_t t2);

This function shall compare the thread IDs t1 and t2.

The pthread_equal () function shall return a non-zero value if t1 and t2 are equal; otherwise, zero shall be returned.

If either t1 or t2 are not valid thread IDs, the behavior is undefined.

No errors are defined.

The pthread_equal () function shall not return an error code of [EINTR].

None.

None.

Implementations may choose to define a thread ID as a structure. This allows additional flexibility and robustness over using an . For example, a thread ID could include a sequence number that allows detection of "dangling IDs" (copies of a thread ID that has been detached). Since the C language does not support comparison on structure types, the pthread_equal () function is provided to compare thread IDs.

None.

pthread_create(3) , pthread_self(3) , the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <pthread.h>

First released in Issue 5. Included for alignment with the POSIX Threads Extension.

The pthread_equal () function is marked as part of the Threads option.

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December 6, 2001 posix.fail