Re: [naviserver-devel] Upload Progress

[Zoran V. <zv...@ar...>]

Am 02.01.2006 um 04:43 schrieb Vlad Seryakov:

> Tried it, nsd started crashing and i am guessing that the problem  
> is combination of aio_write and mmap.
> When is start spooling, i just submit aio_write and return  
> immediately, so there are a lot of quick aio_write calls. By the  
> time i reach mmap, it looks like it's always ahead of actual  
> writing, so even when i am trying to check aio_error/aio_fsync in  
> the NsGetRequest, i still get SIGBUS/SIGSEGV when i access reqPtr- 
> >content, looks like mmap and aio_write are out of sync. And there  
> is no way to wait until all file buffers will be flushed, so manual  
> separate thread implementation could be the only portable solution.  
> Or i just do not understand aio_xxx things completely.

Hm... the idea is to mmap the file when all is read from the client.
So you'd have to aio_write into the file until all is received, then
at some point check the aio_status of the write (non-blocking) and
when it's done, revert to mmap the file. I do not believe you can
mix the aio_ with mmap.

Zoran