Thank you for the info, but I'm not sure it's what I was looking for.
giterr_last uses pthread_key_create which does knows nothing about rust runtime
or rust task. How can I use task local storage to safely call giterr_last,
which uses pthread local storage?
Maybe I'm asking a wrong question. If then, please tell me what I'm wrong about.
—
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On Tue, May 21, 2013 at 9:53 PM, Corey Richardson <[email protected]>
wrote:
> On Tue, May 21, 2013 at 8:03 AM, Lucian Branescu
> <[email protected]> wrote:
>> Rust has task-local storage, which sounds like what you're looking for. This
>> example (http://bubblingbeebles.livejournal.com/111016.html) is a bit old,
>> I'm not sure it would still work.
>>
>>
>> On 21 May 2013 09:16, Kim HyunKang <[email protected]> wrote:
>>>
>>> Hello list.
>>>
>>> I'm a Rust newbie and I'm really excited about this language
>>>
>>> As a process of knowing each other, I'm implementing a libgit2 bindings
>>> for Rust. (You can look at the code at here:
>>> https://github.com/kimhyunkang/git2-rs though it has virtually no features
>>> for now.)
>>>
>>> libgit2 uses thread local storage to store and retrieve error info from
>>> last library call. But the Rust tutorial states that tasks are considered
>>> green threads. As far as I can understand, that means tasks are not mapped
>>> 1:1 to OS thread, thus making thread-local storage unsafe for direct use.
>>>
>>> Then I rememberd errno, another thread local storage that I know of, and
>>> checked the source code to find out how core::os handles errno. But
>>> core::os::errno seems to just call __errno without locking or blocking
>>> anything.
>>>
>>> So, the question is:
>>>
>>> How does the runtime makes sure that errno is not overwritten by another
>>> syscall failure? Is it safe to ignore the possibility of another task
>>> scheduled into the same OS thread?
>>>
>>> - kimhyunkang
> It's http://static.rust-lang.org/doc/core/local_data.html now.
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