please dont rip this site Prev Next

InterlockedExchangeAdd info  Overview  Group

The InterlockExchangeAdd function performs an atomic addition of an increment value to an addend variable. The function prevents more than one thread from using the same variable simultaneously.

LONG InterlockedExchangeAdd (

    PLONG Addend,

// pointer to the addend

    LONG Increment

// increment value



Specifies the address of the number that will have the Increment number added to it.
Specifies the number to be added to the variable pointed to by the Addend parameter.

Return Values

The return value is the initial value of the Addend parameter.


The functions InterlockedExchangeAdd, InterlockedCompareExchange, InterlockedDecrement, InterlockedExchange, and InterlockedIncrement provide a simple mechanism for synchronizing access to a variable that is shared by multiple threads. The threads of different processes can use this mechanism if the variable is in shared memory.

The InterlockedExchangeAdd function performs an atomic addition of the Increment value to the Addend value. The result is stored in the address specified by Addend. The initial value of Addend is returned as the function value.

The variables for InterlockedExchangeAdd must be aligned on a 32-bit boundary; otherwise, this function will fail on multiprocessor x86 systems.

See Also

InterlockedCompareExchange, InterlockedDecrement, InterlockedExchange, InterlockedIncrement

See also:

file: /Techref/os/win/api/win32/func/src/f50_2.htm, 3KB, , updated: 2000/4/7 12:19, local time: 2022/5/17 00:29,

 ©2022 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF=""> InterlockedExchangeAdd</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.

Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

  PICList 2022 contributors:
o List host: MIT, Site host, Top posters @20220517
* Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.

Welcome to!