<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Jay,<div><br></div><div>Before you go off half cocked and brew up some new threads system might I suggest that it would be better to find and fix the current problem. I am sceptical that there is a much thinner M3 thread implementation on top of pthreads than we currently have. I am in the process of tracking down the problem on I386_DARWIN (I see at least one thing broken right now, and will have a fix soon).</div><div><br></div><div>In answer to your question, the wait list is to deal with M3 alerts, which are not the same as pthread cancellation.</div><div><br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; 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Or almost the same?<br><br><br> I understand..there might be a difficult problem..does Modula-3 allow catching an alert? I think so.<br> Does Posix allow canceling a cancel? I think not.<br><br><br> Posix allows, what I think of as try/finally, for alert. Modula-3 probably does too. Even though you can't stop the cancel, you can run "cleanup" code that runs before the cancel completes.<br><br><br>However mapping Modula-3 to Posix here would be tricky. As I see things..any function with a try/finally would have to be contorted into a form that passes a pointer to itself, along with parameters, to C code that does pthread_cleanup_push/pop around calling the function pointer. At least given the Darwin implementation. Other implementations might simply be able to call push at the start and pop at the end. But on Darwin these functions are macros where push introduces a local variable that pop references. I guess maybe one could to the "reverse engineering" approach (just by reading the header). But it'd still be ugly.<br><br><br>I have to do more research here.<br><br><br>I'm seriously consider "writing" a ThreadPThreadDirect.m3 that is thinner than the current ThreadPThread.m3 and see how it fairs, specifically if the Juno hangs go away.<br>"writing" being an exaggeration because it should be very small.<br><br><br>Thanks,<br> - Jay<br><br></div></span></blockquote></div><br></div></body></html>