<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div apple-content-edited="true"><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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; 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font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div><font class="Apple-style-span" color="#0000FF" face="'Gill Sans'"><span class="Apple-style-span" style="font-size: medium;">Signals are no longer used for inc gc so probably ok to switch to fork.</span></font></div><div><font class="Apple-style-span" color="#0000FF" face="'Gill Sans'"><span class="Apple-style-span" style="font-size: medium;"><br></span></font></div><div><span class="Apple-style-span" style="font-size: medium; ">On 15 Jun 2009, at 03:13, Jay wrote:</span></div></span></span></span></span></span></span></span></span></div></span></div></span></div><div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; 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: 0px; "><div class="hmmessage" style="font-size: 10pt; font-family: Verdana; "><font size="2">Is this still true:<br> <br> <br>C:\dev2\cm3.2\m3-libs\m3core\src\unix\solaris-2-x\Unix.i3(943):(*** vfork - spawn new process in a virtual memory efficient way ***)<br>C:\dev2\cm3.2\m3-libs\m3core\src\unix\solaris-2-x\Unix.i3(944):(* Avoid vfork. The way it is used in ProcessPosix breaks incremental GC:<br> <br> <br>(*** vfork - spawn new process in a virtual memory efficient way ***)<br>(* Avoid vfork. The way it is used in ProcessPosix breaks incremental GC:<br>RestoreHandlers in child is reflected in parent to break VM faulting *)<br><*EXTERNAL "fork1"*> PROCEDURE vfork (): int;<br></font><br><br>If this is true, I broke it.<br> <br> <br>C:\dev2\cm3.2\m3-libs\libm3\src\os\POSIX does use vfork.<br> <br> <br>Should we just use fork?<br>vfork is the same as fork on Cygwin -- both are slow.<br> <br>There is also reason to use fork on NetBSD.<br>NetBSD renames nearly every single symbol at the link level via special constructs in its header files.<br>As a result, the usual direct extern Modula-3 pragmas are rarely correct there.<br> That is, for the sake of NetBSD, it is best to wrap every C function with our own C functions.<br>However, wrapping functions contradicts the Posix constraints on vfork -- you are not allowed to return from the function calling vfork without calling exec or _exit. Or do no real systems care about that?<br> <br> <br>So, to be clear, I suggest changing ProcessPosix.m3 from vfork to fork.<br>As well as RTPerfTool.m3.<br> <br> <br>I suggest removing vfork from Unix/*.i3, make sure everything compiles -- that nobody uses it -- and then restoring it, in case there is a later need, to avoid bootstrapping problems if there is.<br> <br> <br> - Jay<br></div></span></blockquote></div><br></body></html>