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I've found stdlib's timer to burn CPU without good reason. Here's what
happens.
The problem is that it sleeps in milliseconds but computes time in
microseconds. And there is bug in code to compute milliseconds to
sleep. It computes microseconds difference between now and nearest
timer event and then does _truncating_ division by 1000. So on average
it sleeps 500 microseconds _less than needed_. On wakeup its checks do
I have timer tick that already occurred? No. Ok how much I need to
sleep ? It does that bad computation again and gets 0
milliseconds. So next gen_server timeout happens right away only to
find we're still before closest timer tick and to decide to sleep 0
milliseconds again. And again and again.
This commit changes division to pick ceiling of ratio rather than
floor. So that we always sleep not less then difference between now
and closest event time.
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* siri/doc-fnu-opts/OTP-10901:
Add documentation of w, i and e addition to +fnu and +fna switches to erl
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These were documented in the stdlib user's guide, but not in the
reference manual for erl. This has now been corrected.
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* maint:
Encode Erlang source files with non-ascii characters in UTF-8
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* bjorn/fix-encoding/OTP-11041:
Encode Erlang source files with non-ascii characters in UTF-8
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To ensure that 'master' compiles when we merge 'maint' to it,
regardless of which encoding is default in 'master', all source
files with non-ascii characters *must* have the encoding specified.
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* lh/demonitor-flush/OTP-11039:
Use erlang:demonitor(Ref, [flush]) where applicable
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* lh/otp-optims/OTP-11035:
Use erlang:demonitor's flush option on timeout
Don't lookup the node unless required in gen:call/{3,4}
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* sverk/dets_remove_test_otp_9607:
stdlib: Fix unstable testcase ets_SUITE:delete_large_named_table
stdlib: Remove obsolete testcase dets_SUITE:otp_9607
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* sv/stdlib/sys-get-state/OTP-11013:
Removed ?line macro
add sys:get_state/1,2 and sys:replace_state/2,3
update sys:get_status/2,3 documentation for gen_event
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In rest_for_one and one_for_all supervisors one child dying can cause
multiple children to be restarted. Previously if the child that caused
the restart is started successfully but another child fails to start,
the supervisor would not terminate this child with the other
successfully restarted children as no record of the pid was kept. Thus
the supervisor would try to start this child again. This could lead to
multiples of the same child or if the child is registered cause repeated
attempts at starting this child - until the max restart threshold was
reached.
Now the child that failed to start becomes the restarting child, instead
of staying with the same child, for the next restart attempt. This has
the following side effects:
1) In one_for_all the new version of the child that original died is
terminated before a restart attempt is made.
2) In rest_for_one all succesfully restarted children are not terminated
and restarting continues from the child that failed to start.
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At Erlang Factory 2013 there was discussion during one of the talks about
the sys:get_status functions and how useful they were for debugging. Geoff
Cant mentioned it would be very useful if the sys module also provided
functions to use while debugging to get just the state of a process and
also to be able to replace the state of a process, and many others in the
audience appeared to agree.
The sys:get_state/1,2 functions return the state of a gen_server, gen_fsm,
or gen_event process. The return value varies depending on the process
type: process state for a gen_server, state name and state data for a
gen_fsm, and handler module, handler id, and handler state for each handler
registered in a gen_event process.
The sys:replace_state/2,3 functions allow the state of a gen_server,
gen_fsm, or gen_event process to be replaced with a new state. These
functions take a function argument that updates or replaces the process
state; using a function to change the state eliminates the race condition
of first reading the state via sys:get_state/1 or sys:get_state/2, using
its return value to create a new state, and then replacing the old state
with the new state, since during that time the process might have received
other calls or messages that could have changed its state.
* For a gen_server process, the state replacement function takes the
process state as an argument and returns a new state.
* For a gen_fsm process, the state replacement function gets a tuple of
{StateName, StateData} and returns a similar tuple that specifies a new
state name, new state data, or both.
* For a gen_event process, the state replacement function is called for
each registered event handler. It gets a tuple {Module, Id, HandlerState}
and returns a similar tuple that specifies the same Module and Id values
but may specify a different value for HandlerState.
If the state replacement function crashes or results in an error, the
original state of a gen_server or gen_fsm process is maintained; if such a
crash occurs for a gen_event process, the original state of the event
handler for which the state replacement function was called is maintained,
but the states of other event handlers of the same gen_event process may
still be updated if no errors or crashes occur while replacing their
states.
Add documentation for sys:get_state/1,2 and sys:replace_state/2,3. The
documentation explicitly notes that the functions are intended for use
during debugging.
Add new tests for these functions to gen_server_SUITE, gen_fsm_SUITE, and
gen_event_SUITE.
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It is equivalent to the few lines removed, except more efficient.
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Move some operations that aren't required for the happy path.
The operations were small, so they shouldn't show a big difference
in benchmarks except for systems with many active gen processes.
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* maint:
Document erl_parse:abstract/2
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Modify the documentation for the sys:get_status/2,3 functions to reflect
that they also work on gen_event processes, and add a cross reference for
gen_event:format_status/2 to go along with the existing cross references
for gen_server and gen_fsm.
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A bug has been fixed: when given the option {encoding,utf8} a list of
floating point numbers (in the correct interval) was mistakenly
returned as a string.
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* maint:
Fix a bug in the Erlang scanner
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The scanner did not crash when a floating point number was encountered
in the input string.
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Remove the call trace from this testcase as we cannot guarantee named
table to be gone until ets:delete returns anyway.
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* dgud/testcase_fixes:
Fix timers
mnesia: Decrease test times
Add debug printouts
wx: Fix failing testcases
stdlib: Ignore symlink tests on windows
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* maint:
Let escript recognize an encoding comment on the second line
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The manual says that an Emacs directive can be placed on the second
line. With this patch that directive is also recognized when selecting
encoding of the script.
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* maint:
Fix a test case
Fix a test case
Fix a test case bug
Fix a test case bug
Remove ?line from dets_SUITE.erl
Adjust dets.erl to cope with an evil test case
Correct a disk_log testcase
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shell_SUITE: Calling i() did not work because if there are more than
100 processes c:i() will go into pager mode, asking for input.
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io_proto_SUITE: node names containing some '-' did not work.
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The test case deletes a Dets process while it is repairing a file.
Another client waiting for the Dets process to reply then kicks in and
repairs the file. Apparently the temporary file was still open,
resulting in an eacces error on Windows.
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* mh/supervisor-doc/OTP-10938:
Delete obsolete note about simple-one-for-one supervisor
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* maint:
[debugger] Add an option 'Strings'
stdlib: Remove race in ets_SUITE:delete_large_tab
stdlib: Remove race in ets_SUITE:delete_large_named_table
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* sverk/test-cuddling:
stdlib: Remove race in ets_SUITE:delete_large_tab
stdlib: Remove race in ets_SUITE:delete_large_named_table
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