---
name: "pthread_getcpuclockid"
section: "3p"
platform: "linux"
package: "man-pages"
version: "6.19-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/pthread_getcpuclockid/3p"
---

# pthread\_getcpuclockid(3p)

access a thread CPU-time clock (ADVANCED REALTIME THREADS)

## PROLOG

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

## NAME

pthread\_getcpuclockid — access a thread CPU-time clock (**ADVANCED REALTIME THREADS**)

## SYNOPSIS

```
#include <pthread.h>
#include <time.h>
```

int pthread\_getcpuclockid(pthread\_t *thread\_id*, clockid\_t \**clock\_id*);

## DESCRIPTION

The *pthread\_getcpuclockid*() function shall return in *clock\_id* the clock ID of the CPU-time clock of the thread specified by *thread\_id*, if the thread specified by *thread\_id* exists.

## RETURN VALUE

Upon successful completion, *pthread\_getcpuclockid*() shall return zero; otherwise, an error number shall be returned to indicate the error.

## ERRORS

No errors are defined.

*The following sections are informative.*

## EXAMPLES

None.

## APPLICATION USAGE

The *pthread\_getcpuclockid*() function is part of the Thread CPU-Time Clocks option and need not be provided on all implementations.

## RATIONALE

If an implementation detects use of a thread ID after the end of its lifetime, it is recommended that the function should fail and report an **\[ESRCH\]** error.

## FUTURE DIRECTIONS

None.

## SEE ALSO

*clock\_getcpuclockid()*, *clock\_getres()*, *timer\_create()*

The Base Definitions volume of POSIX.1‐2017, ***\<pthread.h\>***, ***\<time.h\>***

## COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting\_bugs.html .