---
name: "pthread_make_periodic_np"
section: "3"
platform: "linux"
package: "rtlinux"
version: "2.0rel-1"
release: "Debian 2.2 (Potato)"
platforms: ["linux"]
url: "https://new.carta.tech/pthread_make_periodic_np"
---

# pthread\_make\_periodic\_np(3)

mark a real-time thread as periodic

## NAME

pthread\_make\_periodic\_np - mark a real-time thread as periodic

## SYNOPSIS

**#include \<rtl\_sched.h\>**

**int pthread\_make\_periodic\_np(pthread\_t thread, hrtime\_t start\_time, hrtime\_t period);**

## DESCRIPTION

This function is a non-portable Real-Time Linux extension. **pthread\_make\_periodic\_np** marks the thread *thread* as ready for execution.  The thread will start its execution at *start\_time* (as shown by the clock used for scheduling) and will run at intervals specified by *period.*

If the period is equal to 0, the task will be released once at the start\_time.

## RETURN VALUE

**pthread\_make\_periodic\_np** returns 0 on success and a non-zero error code on error.

## ERRORS

- **ESRCH**

  No thread could be found corresponding to that specified by the given thread ID.

## AUTHOR

Michael Barabanov \<baraban@fsmlabs.com\>

## SEE ALSO

[**pthread\_wait\_np**(3)](/pthread_wait_np/3.md), [**pthread\_create**(3)](/pthread_create/3.md), [**clock\_gettime**(3)](/clock_gettime/3.md), [**clock\_gethrtime**(3)](/clock_gethrtime/3.md), [**gethrtime**(3)](/gethrtime/3.md), [**rtl\_getschedclock**(3)](/rtl_getschedclock/3.md)