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2018-11-22Merge branch 'maint'Sverker Eriksson
2018-11-22Merge branch 'sverker/erts/atomics-counters/OTP-13468' into maintSverker Eriksson
AGAIN * sverker/erts/atomics-counters/OTP-13468: erts: Add counters:put/3
2018-11-21erts: Add counters:put/3Sverker Eriksson
2018-11-16Merge branch 'maint'John Högberg
* maint: Fix broken assertion on monitor release Avoid closing files in gc/monitor callbacks
2018-11-16Merge branch 'john/erts/defer-orphan-file-close/OTP-15421/ERIERL-261' into maintJohn Högberg
* john/erts/defer-orphan-file-close/OTP-15421/ERIERL-261: Fix broken assertion on monitor release Avoid closing files in gc/monitor callbacks
2018-11-15Merge branch 'maint'Sverker Eriksson
2018-11-15erts: Add new module 'counters'Sverker Eriksson
2018-11-15erts: Add new module 'atomics'Sverker Eriksson
2018-11-13Avoid closing files in gc/monitor callbacksJohn Högberg
Closing files in these callbacks could block scheduler progress and cause major system instability. We now defer these operations to a dedicated process instead. This process may in turn block forever and prevent further orphaned files from being closed, but it will keep the emulator itself from misbehaving.
2018-11-06Merge branch 'maint'Björn Gustavsson
* maint: Implement a tab for persistent terms in crashdump viewer Add tests of persistent terms for crashdump_viewer Add a persistent term storage Refactor releasing of literals Extend the sharing-preserving routines to optionally copy literals Conflicts: erts/emulator/Makefile.in erts/emulator/beam/erl_process_dump.c erts/preloaded/ebin/erts_internal.beam erts/preloaded/ebin/init.beam lib/sasl/src/systools_make.erl
2018-11-06Add a persistent term storageBjörn Gustavsson
Persistent terms are useful for storing Erlang terms that are never or infrequently updated. They have the following advantages: * Constant time access. A persistent term is not copied when it is looked up. The constant factor is lower than for ETS, and no locks are taken when looking up a term. * Persistent terms are not copied in garbage collections. * There is only ever one copy of a persistent term (until it is deleted). That makes them useful for storing configuration data that needs to be easily accessible by all processes. Persistent terms have the following drawbacks: * Updates are expensive. The hash table holding the keys for the persistent terms are updated whenever a persistent term is added, updated or deleted. * Updating or deleting a persistent term triggers a "global GC", which will schedule a heap scan of all processes to search the heap of all processes for the deleted term. If a process still holds a reference to the deleted term, the process will be garbage collected and the term copied to the heap of the process. This global GC can make the system less responsive for some time. Three BIFs (implemented in C in the emulator) is the entire interface to the persistent term functionality: * put(Key, Value) to store a persistent term. * get(Key) to look up a persistent term. * erase(Key) to delete a persistent term. There are also two additional BIFs to obtain information about persistent terms: * info() to return a map with information about persistent terms. * get() to return a list of a {Key,Value} tuples for all persistent terms. (The values are not copied.)
2018-10-22Merge branch 'maint'Raimo Niskanen
Conflicts: erts/preloaded/ebin/prim_inet.beam
2018-10-22Merge branch 'raimo/tcp-close-while-send/maint/ERL-561/OTP-12242' into maintRaimo Niskanen
* raimo/tcp-close-while-send/maint/ERL-561/OTP-12242: Write test case Fix hanging gen_tcp send vs close race Conflicts: erts/preloaded/ebin/prim_inet.beam
2018-10-19Fix hanging gen_tcp send vs close raceRaimo Niskanen
While a gen_tcp send was in progress with filled buffers and slow receiver a close (from another process) would place the port in a half dead state so the port could not signal back to send, that waited for confirmation. The solution is to after some time (5 s) of waiting for send confirmation set a monitor on the port, which detects if the port becomes half dead due to close from another process. The close pending loop has also been improved to use the linger timeout for waiting, and to set a system timeout (arbitrarily selected 3 min) to not wait forever when the other end reads data s l o w l y (tarpitting, kind of).
2018-10-17Merge branch 'maint'John Högberg
* maint: "cork" tcp socket around file:sendfile Add nopush TCP socket option
2018-10-17Merge branch 'igor/tcp-nopush-ERL-698/OTP-15357' into maintJohn Högberg
* igor/tcp-nopush-ERL-698/OTP-15357: "cork" tcp socket around file:sendfile Add nopush TCP socket option
2018-10-12Merge branch 'maint'Raimo Niskanen
Conflicts: erts/preloaded/ebin/prim_inet.beam
2018-10-11"cork" tcp socket around file:sendfileIgor Slepchin
This fixes 200ms delay on the last TCP segment when using file:sendfile/2 on Linux (ERL-698).
2018-10-11Add nopush TCP socket optionIgor Slepchin
This translates to TCP_CORK on Linux and TCP_NOPUSH on BSD. In effect, this acts as super-Nagle: no partial TCP segments are sent out until this option is turned off. Once turned off, all accumulated unsent data is sent out immediately. The latter is *not* the case on OSX, hence the implementation ignores "nopush" on OSX to reduce confusion.
2018-10-02Implement {netns,NS} option for inet:getifaddrs/1Raimo Niskanen
Also implement the same option for the legacy undocumented functions inet:getif/1,getiflist/1,ifget/2,ifset/2. The arity 1 functions had before this change got signatures that took a socket port that was used to do the needed syscall, so now the signature was extended to also take an option list with the only supported option {netns,Namespace}. The Socket argument variant remains unsupported. For inet:getifaddrs/1 the documentation file was changed to old style function name definition so be able to hide the Socket argument variant that is visible in the type spec. The arity 2 functions had got an option list as second argument. This list had to be partitioned into one list for the namespace option(s) and the other for the rest. The namespace option list was then fed to the already existing namespace support for socket opening, which places the socket in a namespace and hence made all these functions that in inet_drv.c used getsockopt() work without change. The functions that used getifaddrs() in inet_drv.c had to be changed in inet_drv.c to swap namespaces around the getifaddrs() syscall. This functionality was separated into a new function call_getifaddrs().
2018-10-01Merge branch 'richcarl/erts/erl_init-cleanup/OTP-15336'Lukas Larsson
* richcarl/erts/erl_init-cleanup/OTP-15336: sasl: Order systools_make:preloaded modules alphabetically Update preloaded modules Move calling on_load for preloaded modules to erl_init Make erl_init.c pass the boot module to erl_init.beam Remove obsolete comment text Remove undocumented and unused -# display_items emulator option Remove broken and undocumented boot function emulator option Replace remaining references to otp_ring0 with erl_init Drop otp_ring0, using erl_init instead Update preloaded modules Add erl_init module Conflicts: erts/emulator/beam/erl_init.c erts/preloaded/ebin/erl_prim_loader.beam erts/preloaded/ebin/erl_tracer.beam erts/preloaded/ebin/erlang.beam erts/preloaded/ebin/erts_code_purger.beam erts/preloaded/ebin/erts_dirty_process_signal_handler.beam erts/preloaded/ebin/erts_internal.beam erts/preloaded/ebin/erts_literal_area_collector.beam erts/preloaded/ebin/init.beam erts/preloaded/ebin/otp_ring0.beam erts/preloaded/ebin/prim_buffer.beam erts/preloaded/ebin/prim_eval.beam erts/preloaded/ebin/prim_file.beam erts/preloaded/ebin/prim_inet.beam erts/preloaded/ebin/prim_zip.beam erts/preloaded/ebin/zlib.beam
2018-09-18Merge branch 'maint'Sverker Eriksson
2018-09-18Merge branch 'sverker/erts/robustify-dist-entry-states/OTP-15297' into maintSverker Eriksson
* sverker/erts/robustify-dist-entry-states/OTP-15297: erts: Refactor port dist_entry & conn_id into PRTSD Remove ugly fail case macros Consolidate distribution entry state transitions erts: Fix bug in undocumented system_flag(scheduling_statistics)
2018-09-18Consolidate distribution entry state transitionsSverker Eriksson
* Make connection_id part of the distribution handle as {ConnId, DistEntry} in order for BIFs to verify correct connection. * Make distribution handle opaque to net_kernel. * Remove some unsafe lockless reads of DistEntry.flags * Change state ERTS_DE_STATE_EXITING to be more of an internal state that prevents erts from enqueue, encode or schedule new data to be sent. Otherwise it should behave like ERTS_DE_STATE_CONNECTED.
2018-09-17Merge branch 'maint'Raimo Niskanen
2018-09-17Merge branch 'raimo/receive-TOS-TCLASS/ERIERL-187/OTP-15145' into maintRaimo Niskanen
* raimo/receive-TOS-TCLASS/ERIERL-187/OTP-15145: Write testcases for recvtos and friends Fix term buffer overflow bug Fix documentation due to feedback Implement socket option recvtos and friends
2018-09-17Merge branch 'maint'John Högberg
* maint: Improve trapping in lists:reverse/2 Fix unsafe use of lists:reverse/1
2018-09-13Fix unsafe use of lists:reverse/1John Högberg
We said reverse/2 but used reverse/1 which is unsafe to use in preloaded modules. This didn't have any effect in practice as the affected functions weren't used before the code server was started, but it's still an error.
2018-09-04Implement socket option recvtos and friendsRaimo Niskanen
Implement socket options recvtclass, recvtos, recvttl and pktoptions. Document the implemented socket options, new types and message formats. The options recvtclass, recvtos and recvttl are boolean options that when activated (true) for a socket will cause ancillary data to be received through recvmsg(). That is for packet oriented sockets (UDP and SCTP). The required options for this feature were recvtclass and recvtos, and recvttl was only added to test that the ancillary data parsing handled multiple data items in one message correctly. These options does not work on Windows since ancillary data is not handled by the Winsock2 API. For stream sockets (TCP) there is no clear connection between a received packet and what is returned when reading data from the socket, so recvmsg() is not useful. It is possible to get the same ancillary data through a getsockopt() call with the IPv6 socket option IPV6_PKTOPTIONS, on Linux named IPV6_2292PKTOPTIONS after the now obsoleted RFC where it originated. (unfortunately RFC 3542 that obsoletes it explicitly undefines this way to get packet ancillary data from a stream socket) Linux also has got a way to get packet ancillary data for IPv4 TCP sockets through a getsockopt() call with IP_PKTOPTIONS, which appears to be Linux specific. This implementation uses a flag field in the inet_drv.c socket internal data that records if any setsockopt() call with recvtclass, recvtos or recvttl (IPV6_RECVTCLASS, IP_RECVTOS or IP_RECVTTL) has been activated. If so recvmsg() is used instead of recvfrom(). Ancillary data is delivered to the application by a new return tuple format from gen_udp:recv/2,3 containing a list of ancillary data tuples [{tclass,TCLASS} | {tos,TOS} | {ttl,TTL}], as returned by recvmsg(). For a socket in active mode a new message format, containing the ancillary data list, delivers the data in the same way. For gen_sctp the ancillary data is delivered in the same way, except that the gen_sctp return tuple format already contained an ancillary data list so there are just more possible elements when using these socket options. Note that the active mode message format has got an extra tuple level for the ancillary data compared to what is now implemented gen_udp. The gen_sctp active mode format was considered to be the odd one - now all tuples containing ancillary data are flat, except for gen_sctp active mode. Note that testing has not shown that Linux SCTP sockets deliver any ancillary data for these socket options, so it is probably not implemented yet. Remains to be seen what FreeBSD does... For gen_tcp inet:getopts([pktoptions]) will deliver the latest received ancillary data for any activated socket option recvtclass, recvtos or recvttl, on platforms where IP_PKTOPTIONS is defined for an IPv4 socket, or where IPV6_PKTOPTIONS or IPV6_2292PKTOPTIONS is defined for an IPv6 socket. It will be delivered as a list of ancillary data items in the same way as for gen_udp (and gen_sctp). On some platforms, e.g the BSD:s, when you activate IP_RECVTOS you get ancillary data tagged IP_RECVTOS with the TOS value, but on Linux you get ancillary data tagged IP_TOS with the TOS value. Linux follows the style of RFC 2292, and the BSD:s use an older notion. For RFC 2292 that defines the IP_PKTOPTIONS socket option it is more logical to tag the items with the tag that is the item's, than with the tag that defines that you want the item. Therefore this implementation translates all BSD style ancillary data tags to the corresponding Linux style data tags, so the application will only see the tags 'tclass', 'tos' and 'ttl' on all platforms.
2018-07-30Merge pull request #1891 from ↵Raimo Niskanen
RaimoNiskanen/raimo/can_not-should-mostly-be-cannot OTP-14282 'can not' should mostly be 'cannot'
2018-07-27Change "can not" into "cannot"Raimo Niskanen
I did not find any legitimate use of "can not", however skipped changing e.g RFCs archived in the source tree.
2018-07-26Merge branch 'maint'John Högberg
2018-07-26Merge branch 'maint-21' into maintJohn Högberg
2018-07-18Fix node crash on passing bad arguments to file:read_file_info/2John Högberg
2018-07-11Merge branch 'maint'Sverker Eriksson
2018-07-09erts: Fix spec and docs for process_info 'monitored_by'Sverker Eriksson
to include ports and NIF resources. Added new opaque type 'nif_resource'.
2018-07-03Merge pull request #1854 from ↵John Högberg
jhogberg/john/erts/cross-type-carrier-migration/OTP-15063 Allow carrier migration between different allocator types
2018-06-28Allow cross-type carrier migrationJohn Högberg
2018-06-20Update system_info doc to include ets_countArtur Cygan
2018-06-18Update copyright yearHenrik Nord
2018-06-04Merge branch 'sverker/erlang-memory-fix'Sverker Eriksson
* sverker/erlang-memory-fix: erts: Purge unused allocation types erts: Fix erlang:memory for 'processes' and 'processes_used'
2018-05-29erts: Improve contracts of zlibHans Bolinder
2018-05-28erts: Improve a contractHans Bolinder
2018-05-24Move calling on_load for preloaded modules to erl_initRichard Carlsson
2018-05-24Make erl_init.c pass the boot module to erl_init.beamRichard Carlsson
2018-05-23Drop otp_ring0, using erl_init insteadRichard Carlsson
2018-05-23Add erl_init moduleRichard Carlsson
2018-05-23Use system_time instead of monotonic_time as timestamp in loggerSiri Hansen
2018-05-22erts: Fix erlang:memory for 'processes' and 'processes_used'Sverker Eriksson
to include links and monitors which were lost at 4bc282d812cc2c49aa3e2d073e96c720f16aa270 where these fix_alloc types changed names.
2018-05-16Replace previous suspend in setnode/3Rickard Green