<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On 2008 Jul 28, at 2:41, Galchin, Vasili wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"> So based on what you are saying I kind of need a Haskell AIO "imperative"/monadic function that basically returns a handle that is associated with this AIOCB chunk-of-memory .... This handle gets passed around during an AIO I/O session?? Sorry for talking too "imperatively" ;^) <<< smiley face ;^)<br></div></blockquote><div><br></div><div>I/O *is* monadic in Haskell, so you're kinda there anyway. I would in fact use a custom state (AIO = StateT ForeignPtr IO) if I were doing it; I would hide the constructor so that the only way to alter values is to call specific function(s) returning filled-in aiocbs as initialized and passed to aio_read/aio_write, then provide accessors for the contents (which if necessary can call aio_return, aio_suspend, or aio_error). Returning from the monad would invoke aio_suspend to wait for completion or aio_cancel to abort. (Hm. Could be argued that we want ContT here to represent the two possibilities.)</div><div><br></div><div>I note from my local documentation that (a) indeed you must not modify the aiocb after passing it to aio_read/aio_write and (b) the offset value should not be read, much less modified, because it could change during the async I/O (and not in a reliably useful fashion; consider buffering). And as I said earlier, the exact same memory block (not merely a copy of it) must be used for the same aiocb.</div></div><br><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 11px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 11px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 11px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div><font class="Apple-style-span" face="Monaco"><span class="Apple-style-span" style="font-family: Monaco; "><span class="Apple-style-span" style="font-family: Monaco; ">-- </span></span></font></div><div><font class="Apple-style-span" face="Monaco"><span class="Apple-style-span" style="font-family: Monaco; "><span class="Apple-style-span" style="font-family: Monaco; ">brandon s. allbery [solaris,freebsd,perl,pugs,haskell] <a href="mailto:allbery@kf8nh.com">allbery@kf8nh.com</a></span></span></font></div><div><font class="Apple-style-span" face="Monaco"><span class="Apple-style-span" style="font-family: Monaco; "><span class="Apple-style-span" style="font-family: Monaco; ">system administrator [openafs,heimdal,too many hats] <a href="mailto:allbery@ece.cmu.edu">allbery@ece.cmu.edu</a></span></span></font></div><div><font class="Apple-style-span" face="Monaco"><span class="Apple-style-span" style="font-family: Monaco; "><span class="Apple-style-span" style="font-family: Monaco; ">electrical and computer engineering, carnegie mellon university KF8NH</span></span></font></div><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 11px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><br class="Apple-interchange-newline"></span></span></span></div></span> </div><br></body></html>