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Remove deprecated debug output functions from 21 source files. #9683
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Are there any concerns about late initialization for this? IIRC the compiler can arrange for
dbg_ctlto be constructed on first invocation rather than process start. Is the constructor thread safe?There was a problem hiding this comment.
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I used the reference count work-around for the C++ initialization/destruction order fiasco. Construction of a DbgCtl increments the reference count to the tag container. The tag container is created when the reference count goes from 0 to 1:
trafficserver/include/tscore/DbgCtl.h
Line 38 in 2acf9a4
trafficserver/src/tscore/DbgCtl.cc
Line 123 in 2acf9a4
trafficserver/src/tscore/DbgCtl.cc
Line 72 in 2acf9a4
I probably would have gotten a promotion for figuring all of this out, if I were under 40 and it involved YAML.
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Also note that the static local DbgCtl is key to getting the old Debug() call to have the improved performance:
trafficserver/include/tscore/Diags.h
Line 218 in 9cd7e57
That code has gone through both years of review and running in production.
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If you want to see something really scary, pull over, here's a static DbgCtl that's local to a lambda:
trafficserver/include/tscore/Diags.h
Line 240 in 9cd7e57
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I was much more concerned about thread safety. Can the registry be updated from multiple threads concurrently? Consider line "DbgCtl.cc:158". Is that thread safe?
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Yes because the constructor of _RegistryAccessor takes the registry's mutex:
trafficserver/src/tscore/DbgCtl.cc
Line 139 in fc76b29