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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