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</header>
<p>This document describes the changes made to the Kernel application.</p>
+<section><title>Kernel 3.0</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fixed a deadlock possibility in terminate application</p>
+ <p>
+ Own Id: OTP-11171</p>
+ </item>
+ <item>
+ <p>
+ Fixed bug where sendfile would return the wrong error
+ code for a remotely closed socket if the socket was in
+ passive mode. (Thanks to Vincent Siliakus for reporting
+ the bug.)</p>
+ <p>
+ Own Id: OTP-11614</p>
+ </item>
+ <item>
+ <p>
+ The new option <c>persistent</c> is added to
+ <c>application:set_env/4</c> and
+ <c>application:unset_env/3</c>. An environment key set
+ with the <c>persistent</c> option will not be overridden
+ by the ones configured in the application resource file
+ on load. This means persistent values will stick after
+ the application is loaded and also on application reload.
+ (Thanks to José Valim)</p>
+ <p>
+ Own Id: OTP-11708</p>
+ </item>
+ <item>
+ <p>
+ The spec for file:set_cwd/1 is modified to also accept
+ binaries as arguments. This has always been allowed in
+ the code, but it was not reflected in the spec since
+ binaries are mostly used for raw file names. Raw file
+ names are names that are not encoded according to
+ file:native_name_encoding(), and these are not allowed in
+ file:set_cwd/1. The spec is now, however, more allowing
+ in order to avoid unnecessary dialyzer warnings. Raw file
+ names will still fail in runtime with reason
+ 'no_translation'. (Thanks to José Valim)</p>
+ <p>
+ Own Id: OTP-11787</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ heart:set_cmd/1 is updated to allow unicode code points >
+ 255 in the given heart command</p>
+ <p>
+ Own Id: OTP-10843</p>
+ </item>
+ <item>
+ <p> Dialyzer's <c>unmatched_return</c> warnings have been
+ corrected. </p>
+ <p>
+ Own Id: OTP-10908</p>
+ </item>
+ <item>
+ <p>
+ Make erlang:open_port/2 spawn and spawn_executable handle
+ unicode.</p>
+ <p>
+ Own Id: OTP-11105</p>
+ </item>
+ <item>
+ <p>
+ Erlang/OTP has been ported to the realtime operating
+ system OSE. The port supports both smp and non-smp
+ emulator. For details around the port and how to started
+ see the User's Guide in the <seealso
+ marker="ose:ose_intro">ose</seealso> application. </p>
+ <p>
+ Note that not all parts of Erlang/OTP has been ported. </p>
+ <p>
+ Notable things that work are: non-smp and smp emulators,
+ OSE signal interaction, crypto, asn1, run_erl/to_erl,
+ tcp, epmd, distribution and most if not all non-os
+ specific functionality of Erlang.</p>
+ <p>
+ Notable things that does not work are: udp/sctp, os_mon,
+ erl_interface, binding of schedulers.</p>
+ <p>
+ Own Id: OTP-11334</p>
+ </item>
+ <item>
+ <p>
+ Add the {active,N} socket option for TCP, UDP, and SCTP,
+ where N is an integer in the range -32768..32767, to
+ allow a caller to specify the number of data messages to
+ be delivered to the controlling process. Once the
+ socket's delivered message count either reaches 0 or is
+ explicitly set to 0 with inet:setopts/2 or by including
+ {active,0} as an option when the socket is created, the
+ socket transitions to passive ({active, false}) mode and
+ the socket's controlling process receives a message to
+ inform it of the transition. TCP sockets receive
+ {tcp_passive,Socket}, UDP sockets receive
+ {udp_passive,Socket} and SCTP sockets receive
+ {sctp_passive,Socket}. </p>
+ <p>
+ The socket's delivered message counter defaults to 0, but
+ it can be set using {active,N} via any gen_tcp, gen_udp,
+ or gen_sctp function that takes socket options as
+ arguments, or via inet:setopts/2. New N values are added
+ to the socket's current counter value, and negative
+ numbers can be used to reduce the counter value.
+ Specifying a number that would cause the socket's counter
+ value to go above 32767 causes an einval error. If a
+ negative number is specified such that the counter value
+ would become negative, the socket's counter value is set
+ to 0 and the socket transitions to passive mode. If the
+ counter value is already 0 and inet:setopts(Socket,
+ [{active,0}]) is specified, the counter value remains at
+ 0 but the appropriate passive mode transition message is
+ generated for the socket.</p>
+ <p>
+ Thanks to Steve Vinoski</p>
+ <p>
+ Own Id: OTP-11368</p>
+ </item>
+ <item>
+ <p>
+ A call to either the <c>garbage_collect/1</c> BIF or the
+ <c>check_process_code/2</c> BIF may trigger garbage
+ collection of another processes than the process calling
+ the BIF. The previous implementations performed these
+ kinds of garbage collections without considering the
+ internal state of the process being garbage collected. In
+ order to be able to more easily and more efficiently
+ implement yielding native code, these types of garbage
+ collections have been rewritten. A garbage collection
+ like this is now triggered by an asynchronous request
+ signal, the actual garbage collection is performed by the
+ process being garbage collected itself, and finalized by
+ a reply signal to the process issuing the request. Using
+ this approach processes can disable garbage collection
+ and yield without having to set up the heap in a state
+ that can be garbage collected.</p>
+ <p>
+ The <seealso
+ marker="erts:erlang#garbage_collect/2"><c>garbage_collect/2</c></seealso>,
+ and <seealso
+ marker="erts:erlang#check_process_code/3"><c>check_process_code/3</c></seealso>
+ BIFs have been introduced. Both taking an option list as
+ last argument. Using these, one can issue asynchronous
+ requests.</p>
+ <p>
+ <c>code:purge/1</c> and <c>code:soft_purge/1</c> have
+ been rewritten to utilize asynchronous
+ <c>check_process_code</c> requests in order to
+ parallelize work.</p>
+ <p>
+ Characteristics impact: A call to the
+ <c>garbage_collect/1</c> BIF or the
+ <c>check_process_code/2</c> BIF will normally take longer
+ time to complete while the system as a whole wont be as
+ much negatively effected by the operation as before. A
+ call to <c>code:purge/1</c> and <c>code:soft_purge/1</c>
+ may complete faster or slower depending on the state of
+ the system while the system as a whole wont be as much
+ negatively effected by the operation as before.</p>
+ <p>
+ Own Id: OTP-11388 Aux Id: OTP-11535, OTP-11648 </p>
+ </item>
+ <item>
+ <p>
+ Add sync option to file:open/2.</p>
+ <p>
+ The sync option adds the POSIX O_SYNC flag to the open
+ system call on platforms that support the flag or its
+ equivalent, e.g., FILE_FLAG_WRITE_THROUGH on Windows. For
+ platforms that don't support it, file:open/2 returns
+ {error, enotsup} if the sync option is passed in. Thank
+ to Steve Vinoski and Joseph Blomstedt</p>
+ <p>
+ Own Id: OTP-11498</p>
+ </item>
+ <item>
+ <p> The contract of <c>inet:ntoa/1</c> has been
+ corrected. </p> <p> Thanks to Max Treskin. </p>
+ <p>
+ Own Id: OTP-11730</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Kernel 2.16.4</title>
<section><title>Fixed Bugs and Malfunctions</title>