# Ann: SWI-Prolog 9.3.3 **URL:** \ **Category:** Releases\ **Created:** [March 15, 2024, 5:23pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-3/7311 "2024-03-15T17:23:25Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\ **Post date:** [March 15, 2024, 5:23pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-3/7311/1 "2024-03-15T17:23:26Z")
Dear SWI-Prolog user, SWI-Prolog 9.3.3 is ready for download. This release comes with many fixes, although most will affect few users. They are mostly the result the website (notably SWISH) reorganization, @peter.ludemann work on cpp and @ridgeworks work on clpBNR. Highlights: - Several issues wrt. the “standard” streams could result in crashes and memory leaks. - Several improvements to help/1 for loaded (documented) predicates. - @brebs fixed an old issue with accasionally failing tests for HTTP proxy processing - Preserve properties of foreign predicates when creating a saved state. - Make coverage analysis deal with include/1. - Possibly incorrect handling for C-stack limit. - Various enhancements to HTTP server session management, notably for the Redis plugin. - thread\_exit/1 has been dropped from the Windows version after comments by @mgondan. - Added library(http/http\_server\_health), providing /health to return a JSON document with configurable keys with health related data. Now active on all SWI-Prolog’s public services. - PlDoc enhancements or included files and user predicates. @peter.ludemann fixed closing quotes in LaTeX based docs to use proper Unicode quotes. Eventually, this will probably all be merged into 9.2.3 (stable). Considering the complexity of notably the I/O stream changes it is safer to wait a little. And, on suggestion by @nicos, there are some more sponsor buttons spread over the website and SWISH. In particular institutional and commercial users are kindly requested to donate and help making SWI-Prolog more sustainable. ``` Enjoy --- Jan ``` # SWI-Prolog Changelog since version 9.3.2 - FIXED: tell/1: properly manage standard stream references. - FIXED: Stream reference counting and reset when closing a standard stream. - FIXED: Memory leak in string\_bytes/3. - FIXED: Properly close temporary redirect to a string tellString()/toldString() could fail to reclaim the temporary stream object. - ENHANCED: Use a segmented stack for dealing with findall/3. This avoids memory fragmentatation when findall/3 is deeply nested. Although that is a rare occasion, deeply nested findall/3 leads to poor memory reuse. As activating and deactivating is stacked anyway, a segstack avoids the fragmentation. - ADDED: help(Name/Arity): handle user predicates. - FIXED: xref\_source/2: keep processing PlDoc commands after including a file. - ADDED: help/1: give help on a specific user predicate using Module:PI. - ENHANCED: help/1: filter user predicates on the module class. This use to filter on whether they are documented in the manual, making it impossible to show documentation for loaded predicates that conflict with something defined in the manual. - FIXED: Thread I/O streams may be invalid If a thread is created using thread\_create/3 with the inherit\_from(Thread) option or using PL\_thread\_attach\_engine() (which inherits from `main`), we may copy `current_input` or `current_output` from a temporary redirect. - FIXED: help/1 to deal with help on public predicates in included files. help/1 finds the predicate and, if necessary, reloads the file in which it is defined to get the documentation. If the predicate is defined in an include file it should reload the main file to get the module context right. - ENHANCED: trace/1,2 and friends. - Code cleanup - Support conditional trace using `trace(Head, Port(Condition))` - FIXED: Ensure correct setting file handle for std streams. This was broken after adding the `fileno` field to the IOSTREAM struct. - MODIFIED: Discontinue thread\_exit/1 on Windows The implementation was broken for some time. The reason is not entirely clear, but possibly related to issues in pthread-win32. As the predicate is unsafe and deprecated anyway, it has now been removed from the Windows version. - FIXED: pack metadata checking for `prolog:Feature` requirements. - FIXED: make stream\_property(S, file\_no(N)) safe. This used to be subject to race conditions between the enumerating thread and threads that close the underlying stream. We now copy the file handle as it was found when creating the stream to the main stream structure. - CLARIFIED: PL\_free\_blob() can be called multiple times. This patch changes subsequent calls to a no-op that returns `FALSE` and document this is valid. After comment by Peter Ludemann. - CLEANUP: Do not call blob `release()` on GC or cleanup after PL\_free\_blob() - ENHANCED: Answer/query expansion. Toplevel variable ($Var) handing is now always handled, regardless of the user:expand\_query/4 or user:expand\_answer/2 hooks. The user:expand\_answer/2 hook is superseded by prolog:expand\_answer/3. - DOC: Deprecate format/3 with a non-list 3th argument. - FIXED: Setting the C-stack limit to values not a multiple of the page size Causes problems on some platforms. - DOC: Use ASCII LaTeX ``word’’ - FIXED: Preserve atributes set on foreign functions for saved states. This bug causes http\_stream:stream\_range\_open/3 not be to transparent when reloaded from a saved state. This in turn raises an error with http\_open/3 on HTTPS and chunked streams. - ENHANCED: coverage/2: analyze and annotate included files. The coverage analyzer now deals with files that are included. Files that are included multiple times in different modules get their numbers aggregated. - FIXED: Crash when using ‘$cov\_data’/3 if there is no coverage data. ## Package cpp - DOC: improve non-det example (and tests) - DOC: Use ASCII LaTeX ``word’'. ## Package http - TEST: Don’t reuse original test port for HTTP proxy Instead, use port assigned by OS. - FIXED: Make http session GC thread inherit from `main` This thread is started lazily from an HTTP worker and would by default interit the temporary CGI stream as `current_output`. By interiting from main we can safely print debug messages and avoid stream existence exceptions. - FIXED: HTTP Sessions using Redis to properly handle concurrent delete. Multiple participants may decide to delete a session. By checking the removal from the timeout queue we avoid that two nodes delete the same session. - ADDED: HTTP session management `granularity` This setting controls how precisely we manage idle time updated and session timeouts. This is notably important when using an external (Redis) database for sharing session information to reduce traffic. - ENHANCED: http\_upgrade\_to\_websocket/3: discard a websocket on failure. When using the guarded(false) option, the created web socket is now only left open if the passed Goal succeeds. - DOC: http\_server/2: Explictly mention the possible use of `AF_UNIX` sockets - ENHANCED: Implementation of `open_files` in server stats. - ADDED: Extended `/health` with CPU time and thread satistics. Also allows asking for specific keys only in the HTTP request, e.g. - ADDED: http\_workers/2: mode (?,-) (was (+,-)) Also point at library(http/http\_dyn\_workers) in docs and improve the implementation by using aggregate\_all/3 rather than findall/3 and length/2. - ADDED: library(http\_server\_health) ## Package ltx2htm - FIXED: handling of final single quote - ENHANCED: Warn on non-ASCII characters. We can’t handle these. ## Package pldoc - ENHANCED: Better ordering of predicates comming from other files. pldoc for “re-exported” predicates are now ordered by position, i.e., file name and line number. ## Package plunit - FIXED: Report tests where the setup goal fail as failed and print output. ## Package semweb - FIXED: #110 Allow blank nodes as graph in TRiG format. ## Package swipl-win - FIXED: Reset fileno for stdio streams ---
**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\ **Post date:** [March 24, 2024, 12:48pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-3/7311/4 "2024-03-24T12:48:53Z")
> [@anon95304481](#): > > This release hangs on Windows 10. Doesn’t show the sermon and > then the prompt, just a blank window, when using the GUI console. Thanks for reporting. Fixed and updated the binaries on the download page.