userland supported APIs (was: Re: Synchronization primitives)
userland supported APIs (was: Re: Synchronization primitives)
- Subject: userland supported APIs (was: Re: Synchronization primitives)
- From: Army Research Lab <email@hidden>
- Date: Tue, 29 Apr 2008 11:58:57 -0400
- Thread-topic: userland supported APIs (was: Re: Synchronization primitives)
On 4/29/08 11:20 AM, "Dave Zarzycki" <email@hidden> wrote:
> On Apr 29, 2008, at 8:11 AM, Army Research Lab wrote:
>
>> Actually it is of quite a bit of use! My concern about the OSAtomic*
>> functions is that they are all defined in libkern/OSAtomic.h. If I
>> understand Terry Lambert's earlier reply (sent to the list on
>> Thursday,
>> April 24, 2008, with the subject 'Re: Where is atomicqueue?'), I
>> should only
>> expect to be able to use this within the kernel (Note that that
>> earlier
>> conversation was about atomicqueue, and not about the other
>> functions, so
>> I'm interpreting what he said, and may be interpreting it incorrectly.
>> Terry, please forgive me [and correct me!] if I'm wrong).
>>
>> I want to be able to use this from user space. Are there any
>> functions that
>> are supported from user space and capable of all that the OSAtomic*
>> functions are?
>
> We, Apple, have made a small confusing mess when it comes to
> OSAtomic.h. Both userland and kernel-land have a header by that name.
> Unfortunately, not all of the API within have the same names, with the
> same arguments. The userland header is located here: /usr/include/
> libkern/OSAtomic.h and is supported API.
Does that mean that anything I find in /usr/include is supported in
userland? I mean, what Terry said made a lot of sense to mean, that since
it is in libkern, we shouldn't use it. So, is there anything we should stay
out of in /usr/include when in userland?
Thanks,
Cem Karan
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