---
name: "ck_pr_faa"
section: "3"
platform: "linux"
package: "libck-dev"
version: "0.7.2-6"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/ck_pr_faa"
---

# ck\_pr\_faa(3)

atomic fetch-and-add operations

## NAME

**ck\_pr\_faa\_ptr**, **ck\_pr\_faa\_double**, **ck\_pr\_faa\_char**, **ck\_pr\_faa\_uint**, **ck\_pr\_faa\_int**, **ck\_pr\_faa\_64**, **ck\_pr\_faa\_32**, **ck\_pr\_faa\_16**, **ck\_pr\_faa\_8** – atomic fetch-and-add operations

## LIBRARY

Concurrency Kit (libck, -lck)

## SYNOPSIS

**#include \<ck\_pr.h\>**

*uintptr\_t*\

**ck\_pr\_faa\_ptr**(*void \*target*, *uintptr\_t delta*);

*double*\

**ck\_pr\_faa\_double**(*double \*target*, *double delta*);

*char*\

**ck\_pr\_faa\_char**(*char \*target*, *char delta*);

*unsigned* *int*\

**ck\_pr\_faa\_uint**(*unsigned int \*target*, *unsigned int delta*);

*int*\

**ck\_pr\_faa\_int**(*int \*target*, *int delta*);

*uint64\_t*\

**ck\_pr\_faa\_64**(*uint64\_t \*target*, *uint64\_t delta*);

*uint32\_t*\

**ck\_pr\_faa\_32**(*uint32\_t \*target*, *uint32\_t delta*);

*uint16\_t*\

**ck\_pr\_faa\_16**(*uint16\_t \*target*, *uint16\_t delta*);

*uint8\_t*\

**ck\_pr\_faa\_8**(*uint8\_t \*target*, *uint8\_t delta*);

## DESCRIPTION

The **ck\_pr\_faa**(*3*) family of functions atomically fetch the value pointed to by *target* and add the value specified by *delta* to the value pointed to by *target*.

## RETURN VALUES

This function returns the value pointed to by *target* at the time of operation invocation before the addition operation is applied.

## SEE ALSO

[ck\_pr\_fence\_load(3)](/ck_pr_fence_load/3.md), [ck\_pr\_fence\_load\_depends(3)](/ck_pr_fence_load_depends/3.md), [ck\_pr\_fence\_store(3)](/ck_pr_fence_store/3.md), [ck\_pr\_fence\_memory(3)](/ck_pr_fence_memory/3.md), [ck\_pr\_load(3)](/ck_pr_load/3.md), [ck\_pr\_store(3)](/ck_pr_store/3.md), [ck\_pr\_fas(3)](/ck_pr_fas/3.md), [ck\_pr\_inc(3)](/ck_pr_inc/3.md), [ck\_pr\_dec(3)](/ck_pr_dec/3.md), [ck\_pr\_neg(3)](/ck_pr_neg/3.md), [ck\_pr\_not(3)](/ck_pr_not/3.md), [ck\_pr\_add(3)](/ck_pr_add/3.md), [ck\_pr\_sub(3)](/ck_pr_sub/3.md), [ck\_pr\_and(3)](/ck_pr_and/3.md), [ck\_pr\_or(3)](/ck_pr_or/3.md), [ck\_pr\_xor(3)](/ck_pr_xor/3.md), [ck\_pr\_cas(3)](/ck_pr_cas/3.md), [ck\_pr\_btc(3)](/ck_pr_btc/3.md), [ck\_pr\_bts(3)](/ck_pr_bts/3.md), [ck\_pr\_btr(3)](/ck_pr_btr/3.md)

Additional information available at http://concurrencykit.org/