Low-level details of the implementation of performSelectorOnMainThread:

Question

Was wondering if anyone knows, or has pointers to good documentation that discusses, the low-level implementation details of Cocoa\'s \'performSelectorOnMainThread:\' method.

Answer 1

As Mecki said, a more general mechanism that could be used to implement -performSelectorOn… is NSTimer.

NSTimer is toll-free bridged to CFRunLoopTimer. An implementation of CFRunLoopTimer – although not necessarily the one actually used for normal processes in OS X – can be found in CFLite (open-source subset of CoreFoundation; package CF-476.14 in the Darwin 9.4 source code. (CF-476.15, corresponding to OS X 10.5.5, is not yet available.)