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Communication between Erlang processes has conceptually always been
performed through asynchronous signaling. The runtime system
implementation has however previously preformed most operation
synchronously. In a system with only one true thread of execution, this
is not problematic (often the opposite). In a system with multiple threads
of execution (as current runtime system implementation with SMP support)
it becomes problematic. This since it often involves locking of structures
when updating them which in turn cause resource contention. Utilizing
true asynchronous communication often avoids these resource contention
issues.
The case that triggered this change was contention on the link lock due
to frequent updates of the monitor trees during communication with a
frequently used server. The signal order delivery guarantees of the
language makes it hard to change the implementation of only some signals
to use true asynchronous signaling. Therefore the implementations
of (almost) all signals have been changed.
Currently the following signals have been implemented as true
asynchronous signals:
- Message signals
- Exit signals
- Monitor signals
- Demonitor signals
- Monitor triggered signals (DOWN, CHANGE, etc)
- Link signals
- Unlink signals
- Group leader signals
All of the above already defined as asynchronous signals in the
language. The implementation of messages signals was quite
asynchronous to begin with, but had quite strict delivery constraints
due to the ordering guarantees of signals between a pair of processes.
The previously used message queue partitioned into two halves has been
replaced by a more general signal queue partitioned into three parts
that service all kinds of signals. More details regarding the signal
queue can be found in comments in the erl_proc_sig_queue.h file.
The monitor and link implementations have also been completely replaced
in order to fit the new asynchronous signaling implementation as good
as possible. More details regarding the new monitor and link
implementations can be found in the erl_monitor_link.h file.
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as workarounds to avoid blocking auto-connect,
which is now asynchronous in OTP-21.
Also changed old catch to more efficient try-catch.
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and drop _id suffix.
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to make sure it's kept alive.
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as a preparation for async auto-connect requests.
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Verify that unicode isn't used in a node name and logi an info
message if it is. Filter the head part of the name a bit harder
to work with epmd.
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Also update already deprecated calls.
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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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* mk/net-kernel-epmd-return-list:
Fix list returned by net_kernel:epmd_module
OTP-9215
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Joint effort by Kostis, pan, egil & sverker
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Function epmd_module of net_kernel returns a list
instead of an atom, when the epmd_module-flag is used.
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Conflicts:
lib/kernel/doc/src/notes.xml
lib/kernel/vsn.mk
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A bug introduced in kernel-2.13.5.3 has been fixed. If running
net_kernel:set_net_ticktime/1 twice within the TransitionPerod the
second call caused the net_kernel process to crash with a badmatch.
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OTP-8686 A bug introduced in kernel-2.13.5.3 has been fixed.
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OTP-8643 Under certain circumstances the net kernel could hang. (Thanks
to Scott Lystig Fritchie.)
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A bug introduced in kernel-2.13.5.3 has been fixed.
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Of the core networking apps only net_kernel fails to have a catchall
for unknown gen_server:call messages causing it to exit and eventually
bring down kernal_sup and beam if it had not been manually started.
For stability and consistancy it has been altered to include a
catchall which does not reply.
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Under certain circumstances the net kernel could hang. (Thanks to Scott
Lystig Fritchie.)
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