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authorErlang/OTP <[email protected]>2011-12-12 18:14:34 +0100
committerErlang/OTP <[email protected]>2011-12-12 18:14:34 +0100
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</header>
<p>This document describes the changes made to the STDLIB application.</p>
+<section><title>STDLIB 1.18</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Improved algorithm in module <c>random</c>. Avoid seed
+ values that are even divisors of the primes and by that
+ prevent getting sub-seeds that are stuck on zero. Worst
+ case was random:seed(0,0,0) that produced a series of
+ only zeros. This is an incompatible change in the sense
+ that applications that relies on reproducing a specific
+ series for a given seed will fail. The pseudo random
+ output is still deterministic but different compared to
+ earlier versions.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-8713</p>
+ </item>
+ <item>
+ <p> Calls to <c>global:whereis_name/1</c> have been
+ substituted for calls to
+ <c>global:safe_whereis_name/1</c> since the latter is not
+ safe at all.</p>
+ <p>The reason for not doing this earlier is that setting
+ a global lock masked out a bug concerning the restart of
+ supervised children. The bug has now been fixed by a
+ modification of <c>global:whereis_name/1</c>. (Thanks to
+ Ulf Wiger for code contribution.)</p>
+ <p>A minor race conditions in <c>gen_fsm:start*</c> has
+ been fixed: if one of these functions returned <c>{error,
+ Reason}</c> or ignore, the name could still be registered
+ (either locally or in <c>global</c>. (This is the same
+ modification as was done for gen_server in OTP-7669.)</p>
+ <p>The undocumented function
+ <c>global:safe_whereis_name/1</c> has been removed. </p>
+ <p>
+ Own Id: OTP-9212 Aux Id: seq7117, OTP-4174 </p>
+ </item>
+ <item>
+ <p>
+ If a child of a supervisor terminates with reason
+ {shutdown,Term} it is now handled by the supervisor as if
+ the reason was 'shutdown'. </p>
+ <p>
+ For children with restart type 'permanent', this implies
+ no change. For children with restart type 'transient',
+ the child will no longer be restarted and no supervisor
+ report will be written. For children with restart type
+ 'temporary', no supervisor report will be written.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-9222</p>
+ </item>
+ <item>
+ <p>
+ Minor improvement of documentation regarding supervisor
+ restart strategy for temporary and transient child
+ processes.</p>
+ <p>
+ Own Id: OTP-9381</p>
+ </item>
+ <item>
+ <p>A Dets table with sufficiently large buckets could not
+ always be repaired. This bug has been fixed. </p> <p>The
+ format of Dets files has been modified. When downgrading
+ tables created with the new system will be repaired.
+ Otherwise the modification should not be noticeable. </p>
+ <p>
+ Own Id: OTP-9607</p>
+ </item>
+ <item>
+ <p> A few contracts in the <c>lists</c> module have been
+ corrected. </p>
+ <p>
+ Own Id: OTP-9616</p>
+ </item>
+ <item>
+ <p>
+ Add '-callback' attributes in stdlib's behaviours</p>
+ <p>
+ Replace the behaviour_info(callbacks) export in stdlib's
+ behaviours with -callback' attributes for all the
+ callbacks. Update the documentation with information on
+ the callback attribute Automatically generate
+ 'behaviour_info' function from '-callback' attributes</p>
+ <p>
+ 'behaviour_info(callbacks)' is a special function that is
+ defined in a module which describes a behaviour and
+ returns a list of its callbacks.</p>
+ <p>
+ This function is now automatically generated using the
+ '-callback' specs. An error is returned by lint if user
+ defines both '-callback' attributes and the
+ behaviour_info/1 function. If no type info is needed for
+ a callback use a generic spec for it. Add '-callback'
+ attribute to language syntax</p>
+ <p>
+ Behaviours may define specs for their callbacks using the
+ familiar spec syntax, replacing the '-spec' keyword with
+ '-callback'. Simple lint checks are performed to ensure
+ that no callbacks are defined twice and all types
+ referred are declared.</p>
+ <p>
+ These attributes can be then used by tools to provide
+ documentation to the behaviour or find discrepancies in
+ the callback definitions in the callback module.</p>
+ <p>
+ Add callback specs into 'application' module in kernel
+ Add callback specs to tftp module following internet
+ documentation Add callback specs to inets_service module
+ following possibly deprecated comments</p>
+ <p>
+ Own Id: OTP-9621</p>
+ </item>
+ <item>
+ <p> If a Dets table had been properly closed but the
+ space management data could not been read, it was not
+ possible to repair the file. This bug has been fixed.
+ </p>
+ <p>
+ Own Id: OTP-9622</p>
+ </item>
+ <item>
+ <p>
+ The Unicode noncharacter code points 16#FFFE and 16#FFFE
+ were not allowed to be encoded or decoded using the
+ <c>unicode</c> module or bit syntax. That was
+ inconsistent with the other noncharacters 16#FDD0 to
+ 16#FDEF that could be encoded/decoded. To resolve the
+ inconsistency, 16#FFFE and 16#FFFE can now be encoded and
+ decoded. (Thanks to Alisdair Sullivan.)</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-9624</p>
+ </item>
+ <item>
+ <p>
+ Make epp search directory of current file first when
+ including another file This completes a partial fix in
+ R11 that only worked for include_lib(). (Thanks to
+ Richard Carlsson)</p>
+ <p>
+ Own Id: OTP-9645</p>
+ </item>
+ <item>
+ <p>
+ ms_transform: Fix incorrect `variable shadowed' warnings</p>
+ <p>
+ This patch removes incorrect passing of variable bindings
+ from one function clause to another. (Thanks to Haitao
+ Li)</p>
+ <p>
+ Own Id: OTP-9646</p>
+ </item>
+ <item>
+ <p>
+ Explicitly kill dynamic children in supervisors</p>
+ <p>
+ According to the supervisor's documentation: "Important
+ note on simple-one-for-one supervisors: The dynamically
+ created child processes of a simple-one-for-one
+ supervisor are not explicitly killed, regardless of
+ shutdown strategy, but are expected to terminate when the
+ supervisor does (that is, when an exit signal from the
+ parent process is received)."</p>
+ <p>
+ All is fine as long as we stop simple_one_for_one
+ supervisor manually. Dynamic children catch the exit
+ signal from the supervisor and leave. But, if this
+ happens when we stop an application, after the top
+ supervisor has stopped, the application master kills all
+ remaining processes associated to this application. So,
+ dynamic children that trap exit signals can be killed
+ during their cleanup (here we mean inside terminate/2).
+ This is unpredictable and highly time-dependent.</p>
+ <p>
+ In this commit, supervisor module is patched to
+ explicitly terminate dynamic children accordingly to the
+ shutdown strategy.</p>
+ <p>
+ NOTE: Order in which dynamic children are stopped is not
+ defined. In fact, this is "almost" done at the same time.</p>
+ <p>
+ Stack errors when dynamic children are stopped</p>
+ <p>
+ Because a simple_one_for_one supervisor can have many
+ workers, we stack errors during its shutdown to report
+ only one message for each encountered error type. Instead
+ of reporting the child's pid, we use the number of
+ concerned children. (Thanks to Christopher Faulet)</p>
+ <p>
+ Own Id: OTP-9647</p>
+ </item>
+ <item>
+ <p>
+ Allow an infinite timeout to shutdown worker processes</p>
+ <p>
+ Now, in child specification, the shutdown value can also
+ be set to infinity for worker children. This restriction
+ was removed because this is not always possible to
+ predict the shutdown time for a worker. This is highly
+ application-dependent. Add a warning to docs about
+ workers' shutdown strategy (Thanks to Christopher Faulet)</p>
+ <p>
+ Own Id: OTP-9648</p>
+ </item>
+ <item>
+ <p>
+ A badarg would sometimes occur in supervisor when
+ printing error reports and the child pid was undefined.
+ This has been corrected.</p>
+ <p>
+ Own Id: OTP-9669</p>
+ </item>
+ <item>
+ <p>
+ Fix re:split spec not to accept option 'global'(Thanks to
+ Shunichi Shinohara)</p>
+ <p>
+ Own Id: OTP-9691</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p> Fix a few tests that used to fail on the HiPE
+ platform. </p>
+ <p>
+ Own Id: OTP-9637</p>
+ </item>
+ <item>
+ <p>Variables are now now allowed in '<c>fun M:F/A</c>' as
+ suggested by Richard O'Keefe in EEP-23.</p>
+ <p>The representation of '<c>fun M:F/A</c>' in the
+ abstract format has been changed in an incompatible way.
+ Tools that directly read or manipulate the abstract
+ format (such as parse transforms) may need to be updated.
+ The compiler can handle both the new and the old format
+ (i.e. extracting the abstract format from a pre-R15 BEAM
+ file and compiling it using compile:forms/1,2 will work).
+ The <c>syntax_tools</c> application can also handle both
+ formats.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-9643</p>
+ </item>
+ <item>
+ <p>
+ Tuple funs (a two-element tuple with a module name and a
+ function) are now officially deprecated and will be
+ removed in R16. Use '<c>fun M:F/A</c>' instead. To make
+ you aware that your system uses tuple funs, the very
+ first time a tuple fun is applied, a warning will be sent
+ to the error logger.</p>
+ <p>
+ Own Id: OTP-9649</p>
+ </item>
+ <item>
+ <p>
+ The deprecated '<c>regexp</c>' module has been removed.
+ Use the '<c>re</c>' module instead.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-9737</p>
+ </item>
+ <item>
+ <p>
+ <c>filename:find_src/1,2</c> will now work on stripped
+ BEAM files (reported by Per Hedeland). The HiPE compiler
+ will also work on stripped BEAM files. The BEAM compiler
+ will no longer include compilation options given in the
+ source code itself in <c>M:module_info(compile)</c>
+ (because those options will be applied anyway if the
+ module is re-compiled).</p>
+ <p>
+ Own Id: OTP-9752</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>STDLIB 1.17.5</title>
<section><title>Fixed Bugs and Malfunctions</title>