cocoa: Fix leaks of NSScreen and NSConcreteMapTable
On MacOSX 10.8 QEMU provokes system log messages: 11/03/2013 17:03:29.998 qemu-system-arm[42586]: objc[42586]: Object 0x7ffbf9c2f3b0 of class NSScreen autoreleased with no pool in place - just leaking - break on objc_autoreleaseNoPool() to debug 11/03/2013 17:03:29.999 qemu-system-arm[42586]: objc[42586]: Object 0x7ffbf9c3a010 of class NSConcreteMapTable autoreleased with no pool in place - just leaking - break on objc_autoreleaseNoPool() to debug This is because we call back into Cocoa from threads other than the UI thread (specifically from the CPU thread). Since we created these threads via the POSIX API rather than NSThread, they don't have automatically created autorelease pools. Guard all the functions where QEMU can call back into the Cocoa UI code with autorelease pools so that we don't leak any Cocoa objects. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NAndreas Färber <andreas.faerber@web.de>
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