# PR_AtomicDecrement

Atomically decrements a 32-bit value.

## Syntax

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

PRInt32 PR_AtomicDecrement(PRInt32 *val);
```

### Parameter

The function has the following parameter:

`val`

: A pointer to the value to decrement.

### Returns

The function returns the decremented value (i.e., the result).

## Description

{ref}`PR_AtomicDecrement` first decrements the referenced variable by one.
The value returned is the referenced variable's final value. The
modification to memory is unconditional.