functional tests for atomic operations

Hi, earlier me experienced problems by using atomic operations on GNU/Linux. Are there functional tests out there me could run? The root case is uncertain because there were known issues like unsigned long overflow and concurrent read access.

I'm developing a music sequencer and dealing often with threads. For now me did a work-around using mutices. But me intend to use atomic operations again because it makes more intuitive and simpler.

http://gsequencer.org is hosted on GitHub as https://github.com/weedlight/ags-devel

For the grand picture the engine is running and me adjust dial widget to modify AgsPort field by atomic operations.

At the moment me tries to bring 0.4.2 version to a successful end, marked as stable.

kind regards,
Joël

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Hi Joël,

Atomic operations are by "convention" (and here I'll refer to
Tannebaum etc.) put inside of "critical areas" that you protect with something like a mutex/semaphore/etc. that provides the needed concurrency prevention, but needs to be made fine grained, ie. each variable/operation shared should have it's own mutex/semaphore/etc.

Atomic operations, as in single instructions, are only really
"guaranteed" at the assembler level for the CPU instruction(s) that the CPU(s) are able to guarantee atomicity, and mutexes/semaphores/etc. are implemented using those low level instructions, to provide you with the needed abstraction without having to know the specifics of the CPU (ie. Sparc/x86/Itanium/ARM/PowerPC/etc.). To make it more "intuitive, you could always abstract the specific atomic updates/operation in a function call and just declare it inline etc. for performance

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