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This makes the implementation text of inet:gethostbyname/1 identical to
that of inet_res:gethostbyname/1. I also copied over the doc note about
this resolver option.
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* bjorn/fix-on_load/OTP-12593:
Update documentation regarding improvements
Correctly handle multiple load attempts when on_load is pending
Avoid deadlock when an on_load function makes an external call to the module itself
code_server: Eliminate unnecessary Tag in handle_call/3
Reimplement -on_load()
Refactor erts_finish_loading() and insert_new_code()
code_SUITE: Make on_load_binary/1 clearer by using merl
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If an on_load function had not yet returned, the code server
would only correctly handle calls to code:ensure_loaded/1. That
is, each process that called code:ensured_loaded/1 for the
module in question would be suspended until the on_load function
had returned.
The code server handled calls to code:load_binary/1, code:load_file/1,
and code:load_abs/1 in the same way as for code:ensure_loaded/1.
That means that if call to one those functions attempted to load
*different* code for the module, that code would not get loaded.
Note that code:finish_loading/1 (code:atomic_load/1) will still return
{error,pending_on_load} if there is a pending on_load function for one
of the modules that are about to be loaded. The reason is that
code:finish_loading/1 is meant to either succeed directly, or fail
quickly if there is any problem.
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itself
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For historical reasons, the second argument in handle_call/3 is
{Pid,Tag}. The tag is always 'call' and is never used.
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Load the module as old code; swap old and new code if the
-on_load function succeeds. That way, a failed update attempt
for a module that has an -on_load function will preserve the
previous version of the code.
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* legoscia/dist-shutdown-reasons/PR-1028/OTP-13458:
Error reasons for more distribution errors
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* zandra/optimize-rpc/OTP-13518:
use maps instead of gb_trees to optimize the rpc server
let the spawned processes handle rpc replies
Conflicts:
lib/runtime_tools/test/dbg_SUITE.erl
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This decreases the load on the rex server.
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Refactor get_name/1 to facilitate an optimization in the next commit.
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make_path() returns a tuple whose second element is not used by
any of its caller. Eliminate the tuple.
Also avoid calling filename:dirname/1 when we already have the result
stored in a variable, and avoid calling filename:basename/2 on a
complete path when we already have the last part of the pathname
stored in a variable.
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absname/1 is quite expensive, so we should not call if we already
have a normalized absolute path.
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The same filtering of sub directories is done in archive_subdirs/1
and try_archive_subdirs/1. Actually, archive_subdirs/1 does nothing
useful. It can be removed and all_archive_subdirs/1 can be renamed
to archive_subdirs/1.
In try_archive_subdirs/1, we can also replace filename:join/1
with the cheaper filename:append/1, since we know that pathnames
have already been normalized.
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It is faster and easier to use filename:split/1 and filename:join/1
than use four different 'filename' operations. Each call in the
original call first flattens the input list, and then traverse the
entire string to the end. So there are roughly 8 complete traversals.
In comparison, filename:split/1 will traverse the input string
twice (once to flatten, once to split) and filename:join/1 once.
For background on why this optimization is worthwhile, here is the
result of profiling the start-up of the run-time system on my computer
(done before this optimization):
$ $ERL_TOP/bin/erl -profile_boot
.
.
.
filename:join1/4 - 13573 : 13805 us
erlang:finish_loading/1 - 27 : 19963 us
filename:do_flatten/2 - 29337 : 49518 us
erlang:prepare_loading/2 - 49 : 52270 us
Note that filename:do_flatten/2 ends up in second place, almost
as expensive as erlang:prepare_loading/2. Your mileage may vary,
depending on the length of $ERL_TOP and the number of extra
directories added to the path using $ERL_LIBS.
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Add descriptive shutdown reasons when an incoming distribution
connection is rejected because it is not on the "allowed" list or
because it has an incorrect cookie. These error reasons can be seen
after calling net_kernel:verbose(1).
Distinguishing these failures is valuable, because the log message
printed is otherwise identical.
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Add the possibility to use modules as trace data receivers. The functions
in the module have to be nifs as otherwise complex trace probes will be
very hard to handle (complex means trace probes for ports for example).
This commit changes the way that the ptab->tracer field works from always
being an immediate, to now be NIL if no tracer is present or else be
the tuple {TracerModule, TracerState} where TracerModule is an atom that
is later used to lookup the appropriate tracer callbacks to call and
TracerState is just passed to the tracer callback. The default process and
port tracers have been rewritten to use the new API.
This commit also changes the order which trace messages are delivered to the
potential tracer process. Any enif_send done in a tracer module may be delayed
indefinitely because of lock order issues. If a message is delayed any other
trace message send from that process is also delayed so that order is preserved
for each traced entity. This means that for some trace events (i.e. send/receive)
the events may come in an unintuitive order (receive before send) to the
trace receiver. Timestamps are taken when the trace message is generated so
trace messages from differented processes may arrive with the timestamp
out of order.
Both the erlang:trace and seq_trace:set_system_tracer accept the new tracer
module tracers and also the backwards compatible arguments.
OTP-10267
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* paulgray/inet_db_fix/PR-949/OTP-13470:
Fix start timestamp instead of time check
Allow to refresh resolver settings on startup
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* henrik/update-copyrightyear:
update copyright-year
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to let future nodes know that we can handle
NEW_PID_EXT, NEW_PORT_EXT and NEWER_REFERENCE_EXT.
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rpc:pinfo/2 is documented as a location-transparent version
of process_info/2. Therefore, it should be expected that
the spec would allow calls with an item list, for example:
rpc:pinfo(Pid, [initial_call,last_calls])
Report-URL: http://bugs.erlang.org/browse/ERL-124
Reported-by: bjfish
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Verify with:
erl -noshell -eval 'io:write(inet_res:lookup("localhost",in,a)),io:nl(),init:stop().'
Prints:
[{127,0,0,1}]
Without this correction you will get [] on a hostname that works
later after system start.
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* bjorn/kernel/remove-deprecated/OTP-13449:
rpc: Remove functions deprecated in R12B
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OTP-13458
* dcorbacho/dist_util_logs:
Keep error reasons for some common distribution errors
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code:set_path/1 no longer returns {error,bad_path} (an exception
will be thrown instead).
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This is necessary for windows to perform correctly when writing
large files.
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On Windows, the pathnames for modules that are loaded early are
returned with mixed backslashes and slashes:
1> code:which(lists).
"C:\\Program Files\\erl8.0/lib/stdlib-2.7/ebin/lists.beam"
2>
Modules loaded later are fully normalized.
When starting the code_server, normalize the pathnames for all modules
that have been loaded so far.
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These error reasons can be seen in the logs after calling net_kernel:verbose(1).
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* bjorn/kernel/rpc/OTP-13409:
Don't throw exceptions from rpc:call() and rpc:block_call()
Reduce code duplication in called_node_dies/1 and friends
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* bjorn/clearer-startup-crashes/OTP-13294:
Make distribution failures during start-up easier to read
net_kernel: Separate exports into documented and non-documented groups
erl_distribution: Simplify start_link/0 and friends
Reorder and comment API functions
Clean up splitting of node names
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When an attempt is made to start a distributed Erlang node with
the same name as an existing node, the crash reports for several
supervisors would be displayed. Only the first line contains
useful information. The verbiage is annoying for old hands and
could easily scare newcomers away for good.
For all the common distribution failures during start-up, write a
simple message and terminate the emulator using halt/1. Here is an
example of what will be printed:
Protocol 'inet_tcp': the name somename@somehost seems to be in use by another Erlang node
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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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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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- 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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* siri/appups-19.0:
Update appups in kernel, stdlib and sasl for OTP-19
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* msantos/epmd-IPv6-node-reg2/PR-864/OTP-13364:
epmd: support IPv6 node registration
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* siri/appups-18.3:
Update appups in kernel, stdlib and sasl for OTP-18.3
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* bjorn/multiple-load/OTP-13111:
code: Add functions that can load multiple modules
Refactor post_beam_load handling
Simplify and robustify code_server:all_loaded/1
Update preloaded modules
Add erl_prim_loader:get_modules/3
Add has_prepared_code_on_load/1 BIF
Allow erlang:finish_loading/1 to load more than one module
beam_load.c: Add a function to check for an on_load function
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