# PR_QueueJob_Write

Causes a job to be queued when a socket becomes writable.

## Syntax

```{code}
#include <prtpool.h>

NSPR_API(PRJob *)
PR_QueueJob_Write(
  PRThreadPool *tpool,
  PRJobIoDesc *iod,
  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.

`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.