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# PR_QueueJob_Timer
Causes a job to be queued when a timer expires.
## Syntax
```{code}
#include <prtpool.h>
NSPR_API(PRJob *)
PR_QueueJob_Timer(
PRThreadPool *tpool,
PRIntervalTime timeout,
PRJobFn fn,
void * arg,
PRBool joinable
);
```
### Parameters
The function has the following parameters:
`tpool`
: A pointer to a {ref}`PRThreadPool` structure previously created by a
call to {ref}`PR_CreateThreadPool`.
`iod`
: A pointer to a {ref}`PRJobIoDesc` structure.
`timeout`
: A value, expressed as a {ref}`PRIntervalTime`, to wait before queuing
the job.
`fn`
: The function to be executed when the job is executed.
`arg`
: A pointer to an argument passed to `fn`.
`joinable`
: If `PR_TRUE`, the job is joinable. If `PR_FALSE`, the job is not
joinable. See {ref}`PR_JoinJob`.
### Returns
Pointer to a {ref}`PRJob` structure or `NULL` on error.