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This can be used as a simple form of overload protection, discarding the
message before it's passed into diameter to become one more request
process in a flood. Replying with 3004 would be more appropriate when
the request has been directed at a specific server (the RFC's
requirement) however, and possibly it should be possible for a callback
to do this as well.
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In addition to returning ok or {timeout, Tmo}, let a throttling callback
for message reception return a pid(), which is then notified if the
message in question is either discarded or results in a request process.
Notification is by way of messages of the form
{diameter, discard | {request, pid()}}
where the pid is that of a request process resulting from the received
message. This allows the notification process to keep track of the
maximum number of request processes a peer connection can have given
rise to.
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The callback is now applied to the atom 'false' when asking if another
message should be received on the socket, and to a received binary
message after reception. Throttling on received messages makes it
possible to distinguish between requests and answers.
There is no callback on outgoing messages since these don't have to go
through the transport process, even if they currently do.
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To let a callback module decide whether or to receive another message
from the peer, so that backpressure can be applied when it's
inappropriate. This is to let a callback protect against reading more
than can be processed, which is otherwise possible since diameter_tcp
otherwise always asks for more.
A callback is made after each message, and can answer to continue
reading or to ask again after a timeout. It's each message instead of
each packet partly for simplicity, but also since this should be
sufficiently fine-grained. Per packet would require some interaction
with the fragment timer that flushes partial messages that haven't been
completely received.
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Those clause are obsolete and never used by common_test.
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The macro ?t is deprecated. Replace its use with 'test_server'.
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The documentation for rpc:call() says:
Evaluates apply(Module, Function, Args) on the node Node and
returns the corresponding value Res, or {badrpc, Reason} if
the call fails.
What is not said that rpc:call() can generate an exception if the
'rex' process on the other node is killed:
(kalle@host)1> Rex = rpc:call(arne@host, erlang, whereis, [rex]).
<6937.14.0>
(kalle@host)2> rpc:call(arne@host, erlang, exit, [Rex,kill]).
** exception exit: {killed,
{gen_server,call,
[{rex,arne@host},
{call,erlang,exit,[<6937.14.0>,kill],<0.33.0>},
infinity]}}
in function rpc:rpc_check/1 (rpc.erl, line 361)
On the other hand, if the other node shuts down for some other reason,
we'll get a {badrpc,nodedown} result:
(kalle@host)5> rpc:call(arne@host, erlang, halt, []).
{badrpc,nodedown}
There does not seem to be any reason to handle the two cases
differently. If the 'rex' process is terminated on the other node,
it will shut down shortly thereafter.
Therefore, change rpc:call() and rpc:block_call() to always return
{badrpc,Reason} is the call fails:
(kalle@host)1> Rex = rpc:call(arne@host, erlang, whereis, [rex]).
<6937.14.0>
(kalle@host)2> rpc:call(arne@host, erlang, exit, [Rex,kill]).
{badrpc,{'EXIT',{killed,{gen_server,call,
[{rex,arne@host},
{call,erlang,exit,[<7126.14.0>,kill],<0.33.0>},
infinity]}}}}
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* rickard/doc-fix:
Fix doc build
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* vinoski/ds-avoid-lock:
Skip run queue lock check for dirty schedulers
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* rickard/ds-sched-suspend:
Improved scheduler suspend functionality
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start_link/0 and friends are too convoluted for me.
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Move all functions meant to be called from other modules before
the internal functions. Comment them to make it clearer what their
purpose are.
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* bjorn/kernel/modernize-tests:
Remove ?line macros
Fix comments
gen_tcp_misc_SUITE: Use unique node names
Eliminate use of the ?t macro
Eliminate use of doc and suite clauses
Replace use of test_server:capture*/0 with ct:capture*/0
Eliminate use test_server:format()
Eliminate use of test_server:sleep/1
Eliminate use of test_server:fail/0,1
Eliminate use of ?config() macro
Modernize timetraps
disk_log_SUITE: Remove vestiges of VxWorks support
Conflicts:
lib/kernel/test/code_SUITE.erl
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* bjorn/compiler/opt/OTP-12951:
beam_block: Eliminate unsafe optimization
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- The calling process is now suspended while synchronizing
scheduler suspends via erlang:system_flag(schedulers_online, _)
and erlang:system_flag(multi_scheduling, _), instead of blocking
the scheduler thread in the BIF call waiting for the operation
to synchronize. Besides releasing the scheduler for other work
(or immediate suspend) it also makes it possible to abort the
operation by killing the process.
- erlang:system_flag(schedulers_online, _) now only wait for normal
schedulers to complete before it returns. This since it may take
a very long time before all dirty schedulers suspends.
- erlang:system_flag(multi_scheduling, block_normal|unblock_normal)
which only operate on normal schedulers has been introduced. This
since there are use cases where suspend of dirty schedulers are
not of interest (hipe loader).
- erlang:system_flag(multi_scheduling, block) still blocks all
dirty schedulers as well as all normal schedulers except one since
it is hard to redefine what multi scheduling block means.
- The three operations:
- changing amount of schedulers online
- blocking/unblocking normal multi scheduling
- blocking/unblocking full multi scheduling
can now be done in parallel. This is important since otherwise
a full multi scheduling block would potentially delay the other
operations for a very long time.
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Also add missing test for PEM encoded private EC keys.
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While we are it, also re-ident the files.
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Remove out-commented code. Make sure that comments that are not
at the end of a line starts with two '%' characters and not just
one. That will become important later when we'll remove all
?line macros and ask Emacs to re-indent the files.
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Use unique node names to ensure that one failed test case will
not cause other test cases to fail if a slave node was left.
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* siri/common_test/fix-doc-links:
Fix link errors in common_test documentation
Document that any ssh option is allowed in ct_netconfc
Conflicts:
lib/common_test/doc/src/ct_hooks_chapter.xml
lib/common_test/doc/src/ct_netconfc.xml
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* siri/ct_netconfc/doc-allow-ssh-options/OTP-13338:
Document that any ssh option is allowed in ct_netconfc
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* siri/code_SUITE-fix:
Change '==' to '=' in code_SUITE:bad_erl_libs
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Those clause are obsolete and never used by common_test.
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Replace with io:format/2 or ct:pal/3.
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* peppe/common_test/cth_improvements_docs:
Document new CT Hook functions
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* peppe/common_test/html_improvements_docs:
Document the new HTML improvements
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* peppe/common_test/new_docs:
Some minor fixes
Stop using edoc for the reference manual
Common Test: Editorial changes 3
Common Test: Editorial changes 2
Common Test: Editorial changes 1
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