a multi-thread sample code. the GUI will not stop responding during the app is processing other task

shell_task
..........\controller.h
..........\controller.m
..........\English.lproj
..........\.............\InfoPlist.strings
..........\.............\MainMenu.xib
..........\Info.plist
..........\main.m
..........\shell_task.xcodeproj
..........\....................\gxagxagxa.mode1v3
..........\....................\gxagxagxa.pbxuser
..........\....................\project.pbxproj
..........\....................\TemplateIcon.icns
..........\shell_task_Prefix.pch

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