friss created this revision. friss added reviewers: jasonmolenda, clayborg, jingham. Herald added a subscriber: jdoerfert.
In 2010 (r118866), filtering code was added to debugserver to avoid reporting threads that were "not ready to be displayed to the user". This code inspects the thread's state and discards threads marked 'uninterruptible'. Turns out, this state is pretty common and not only a characterisitic of 'user-readiness'. This filtering was tracked down as the source of the flakiness of TestQueues and TestConcurrent* with the symptom of missing threads. We discussed with the kernel team and there should be no need for us to filter the restult of task_threads(). Everything that is returned from there can be examined. So I went on and tried to remove the filtering completely. This produces other test failures, where we were reporting more theads than expected. Always threads that had been terminated, but weren't removed from the task bookkeeping structures yet. Those threads always had a PC of 0. This patch changes the heuristic to make the filtering a little less strict and only rejects threads that are 'uninteruptible' *and* have a PC of 0. This has proven to be solid in my testing. https://reviews.llvm.org/D58912 Files: tools/debugserver/source/MacOSX/MachThread.cpp Index: tools/debugserver/source/MacOSX/MachThread.cpp =================================================================== --- tools/debugserver/source/MacOSX/MachThread.cpp +++ tools/debugserver/source/MacOSX/MachThread.cpp @@ -243,7 +243,7 @@ case TH_STATE_HALTED: return true; } - return false; + return GetPC(0) != 0; } struct thread_basic_info *MachThread::GetBasicInfo() {
Index: tools/debugserver/source/MacOSX/MachThread.cpp =================================================================== --- tools/debugserver/source/MacOSX/MachThread.cpp +++ tools/debugserver/source/MacOSX/MachThread.cpp @@ -243,7 +243,7 @@ case TH_STATE_HALTED: return true; } - return false; + return GetPC(0) != 0; } struct thread_basic_info *MachThread::GetBasicInfo() {
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