R=rsc http://codereview.appspot.com/6445076

R=rsc http://codereview.appspot.com/6457077

In the current code, the srv file is removed just after the main thread exits, while the srv thread is still running, which is not the expected behavior. We moved the srv creation just before the procrfork, in order that the srv file will not be removed until the srv thread exits. R=rsc http://codereview.appspot.com/6397047

R=rsc http://codereview.appspot.com/6455083

This patch reverts the recent patch named "devdraw: fix for OS X 10.8", and fixes redrawing on OSX 10.8 differently, making scrolling under Acme 3 times faster. R=rsc, mirtchovski CC=plan9port.codebot http://codereview.appspot.com/6452087

In MacOS 10.8, the NSBitmapImageRep class appears to cache the specified image data at the time of construction. As a result updates to the backing memimage object do not get pushed to the screen in flushimg. This patch creates the NSBitmapImageRep object over again for each flushimg which would appear to fix the problem. R=rsc CC=plan9port.codebot http://codereview.appspot.com/6443063

Don't call vtlog() when _vtqrecv() returns nil on queue hangup, as reported on http://bitbucket.org/rsc/plan9port/issue/102/ R=rsc http://codereview.appspot.com/6373046

R=rsc, rsc http://codereview.appspot.com/6405057

R=rsc http://codereview.appspot.com/6402049

R=rsc http://codereview.appspot.com/6401049

R=rsc http://codereview.appspot.com/6395048

R=rsc http://codereview.appspot.com/6395047

R=rsc http://codereview.appspot.com/6402044

R=rsc http://codereview.appspot.com/6396045

R=rsc http://codereview.appspot.com/6397046