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Avoid sending cb messages to the wx_object, since it may deadlock.
Instead send it to the wxe_server which reads the state from the wx_object's
process_dictionary.
Ugly but it's the only way I can avoid the deadlock.
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This commit is a preparation for introducing location information
(filename/line number) in stacktraces in exceptions. Currently
a stack trace looks like:
[{Mod1,Function1,Arity1},
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{ModN,FunctionN,ArityN}]
Add a forth element to each tuple that can be used indication
the filename and line number of the source file:
[{Mod1,Function1,Arity1,Location1},
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{ModN,FunctionN,ArityN,LocationN}]
In this commit, the fourth element will just be an empty list,
and we will change all code that look at or manipulate stacktraces.
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The gen_fsm, gen_server, and wx_object format_status implementations
fail to handle global names of the form {global, term()} where term()
is something other than an atom, pid, or list. Change these
format_status implementations to treat names that are atoms, pids, or
lists as before, but for all other terms, set the header property of
the function return value to a tuple whose first element is a string
describing the return value and whose second element is the name term.
Add unit tests for gen_server and gen_fsm to verify sys:get_status
calls work successfully for globally registered instances.
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* bg/wx_objects:
wx_objects: Fix calls to unexported gen_server:print_event/3
OTP-8638 bg/wx_objects
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In code copied (and modified) from the gen_server module, there
are references to the gen_server:print_event/3 function, which is
not exported.
We could export print_event/3 from the gen_server, but in that
case we must promise to keep the function and keep it compatible
in the future. Since the function is small and wx_object already
contains a lot of code copied from gen_server, let's copy the
code for print_event/3 too.
(Thanks to Kostis Sagonas. This old bug was exposed by a patch
by Kostis that replaced "tuple funs" with real funs.)
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