Objective-C applications using the data channel could crash when the following conditions were met:
- The application creates a data channel and sets a data channel delegate
- The delegate is deallocated but the application never clears it
When this happens, the dealloc method in RTCDataChannel would reset the delegate to nil. The setDelegate: method immediately returns if the new delegate value is the same as the old one. Since the old one is a weak reference, it becomes nil, and the DataChannelDelegateAdapter is not unsubscribed from the native channel before it gets deleted.
The fix removes the two optimizations, and instead subscribes the adapter to the native data channel at creation time - and unsubscribes it at dealloc time. This makes it very easy to reason about the lifetime of the subscription. Removing the optimization should have little effect on performance, as applications typically set the delegate when the channel is created.
BUG=
Review-Url: https://codereview.webrtc.org/1957523006
Cr-Commit-Position: refs/heads/master@{#12649}
But keep #including scoped_ptr.h in .h files, so as not to break
WebRTC users who expect those .h files to give them rtc::scoped_ptr.
BUG=webrtc:5520
Review-Url: https://codereview.webrtc.org/1937693002
Cr-Commit-Position: refs/heads/master@{#12581}
- Places most ObjC code into webrtc/sdk/objc instead.
- New gyp targets to build, strip and export symbols for dylib.
- Removes old script used to generate dylib.
BUG=
Review URL: https://codereview.webrtc.org/1903663002
Cr-Commit-Position: refs/heads/master@{#12524}
