NAME
pthread_equal —
compare thread IDs
SYNOPSIS
#include
<pthread.h>
int pthread_equal(pthread_t t1, pthread_t t2);
DESCRIPTION
This function shall compare the thread IDs t1 and t2.
RETURN VALUE
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.
ERRORS
No errors are defined.
The pthread_equal () function shall not
return an error code of [EINTR].
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
Implementations may choose to define a thread ID as a structure.
This allows additional flexibility and robustness over using an
int. 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.
FUTURE DIRECTIONS
None.
SEE ALSO
pthread_create(3), pthread_self(3)
XBD <pthread.h>
CHANGE HISTORY
First released in Issue 5. Included for alignment with the POSIX Threads Extension.
Issue 6
The pthread_equal () function is marked as
part of the Threads option.
Issue 7
The pthread_equal () function is moved
from the Threads option to the Base.