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This makes proc_lib behaves like a normal process as far
as the propagation of exceptions is concerned.
Before this commit, the following difference could be
observed:
6> spawn_link(fun() -> ssl:send(a,b) end).
<0.43.0>
7> flush().
Shell got {'EXIT',<0.43.0>,
{function_clause,
[{ssl,send,[a,b],[{file,"..."},{line,275}]}]}}
ok
8> proc_lib:spawn_link(fun() -> ssl:send(a,b) end).
<0.46.0>
9> flush().
Shell got {'EXIT',<0.46.0>,function_clause}
After this commit, we get the following instead:
3> flush().
Shell got {'EXIT',<0.61.0>,
{function_clause,
[{ssl,send,[a,b],[{file,"..."},{line,275}]},
{proc_lib,init_p,3,[{file,"..."},{line,232}]}]}}
The stacktrace will show minor differences of course
but the form is now the same as without proc_lib.
The rationale behind this commit is that:
* We now have a single form regardless of how the process
was started
* We can use the stacktrace to programmatically alter behavior
(for example an HTTP server identifying problems in input
decoding to send back a generic 400, or a 500 otherwise)
* We can access the stacktrace to print it somewhere (for
example an HTTP server could send it back to the client
when a debug mode is enabled)
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While we are it, also re-ident the files.
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Note that the sleeping time in ct:sleep/1 will be scaled if
the test is run with (for example) cover. When it is important
that the sleep time is not adjusted, use timer:sleep/1.
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As a first step to removing the test_server application as
as its own separate application, change the inclusion of
test_server.hrl to an inclusion of ct.hrl and remove the
inclusion of test_server_line.hrl.
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First refactor the entire test case using helper functions
to facilitate further maintenance. Then test that proc_lib
can handle that the process dictionary has been erased
(that will cover more code in proc_lib).
We can also shave off 2 seconds of the execution time by
testing the 'shutdown' exit reasons at beginning of the
test case instead of doing it at the end.
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Use error/1 instead of forcing a badmatch.
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We'll need a way to limit the size of the crash report produced
by proc_lib:format(). Add format/3, where the third argument is
a depth argument.
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Report handlers are not automatically removed. That means
that the report handler will remain installed until the entire
running of the stdlib test suite finishes. That could potentially
cause problems.
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The new function utilizes sys:terminate.
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Monitor the spawned process in proc_lib:start/[3|4|5], so
that a proper error is returned, if the spawned process crashes
before proclib:init_ack/1 is sent.
Previously the calling process would hang forever or until specified
timeout. Start link catches these errors but start did not.
start now behaves as start_link if process traps exit.
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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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