- swipl
- library
- error.pl
- apply.pl
- lists.pl
- debug.pl -- Print debug messages and test assertions
- broadcast.pl
- socket.pl -- Network socket (TCP and UDP) library
- predicate_options.pl -- Access and analyse predicate options
- shlib.pl -- Utility library for loading foreign objects (DLLs, shared objects)
- option.pl
- uid.pl -- User and group management on Unix systems
- unix.pl
- syslog.pl -- Unix syslog interface
- thread_pool.pl
- gensym.pl -- Generate unique symbols
- settings.pl -- Setting management
- arithmetic.pl -- Extensible arithmetic
- main.pl -- Provide entry point for scripts
- readutil.pl -- Read utilities
- ssl.pl
- crypto.pl
- filesex.pl -- Extended operations on files
- doc_http.pl -- Documentation server
- pldoc.pl -- Process source documentation
- operators.pl -- Manage operators
- pairs.pl -- Operations on key-value lists
- prolog_source.pl -- Examine Prolog source-files
- sgml.pl -- SGML, XML and HTML parser
- quasi_quotations.pl -- Define Quasi Quotation syntax
- uri.pl -- Process URIs
- url.pl -- Analysing and constructing URL
- www_browser.pl -- Open a URL in the users browser
- prolog_colour.pl -- Prolog syntax colouring support.
- record.pl -- Access compound arguments by name
- prolog_xref.pl -- Prolog cross-referencer data collection
- occurs.pl -- Finding and counting sub-terms
- ordsets.pl -- Ordered set manipulation
- assoc.pl -- Binary associations
- ugraphs.pl -- Graph manipulation library
- memfile.pl
- xpath.pl -- Select nodes in an XML DOM
- iostream.pl -- Utilities to deal with streams
- atom.pl -- Operations on atoms
- porter_stem.pl
- solution_sequences.pl -- Modify solution sequences
- prolog_pack.pl -- A package manager for Prolog
- prolog_config.pl -- Provide configuration information
- process.pl -- Create processes and redirect I/O
- git.pl -- Run GIT commands
- ctypes.pl -- Character code classification
- time.pl -- Time and alarm library
- utf8.pl -- UTF-8 encoding/decoding on lists of character codes.
- base64.pl -- Base64 encoding and decoding
- sha.pl -- SHA secure hashes
- crypt.pl
- persistency.pl -- Provide persistent dynamic predicates
- pure_input.pl -- Pure Input from files and streams
- nb_set.pl -- Non-backtrackable sets
- xsdp_types.pl -- XML-Schema primitive types
- uuid.pl -- Universally Unique Identifier (UUID) Library
- pcre.pl -- Perl compatible regular expression matching for SWI-Prolog
- aggregate.pl -- Aggregation operators on backtrackable predicates
- rdf_write.pl -- Write RDF/XML from a list of triples
- rdf.pl -- RDF/XML parser
- sgml_write.pl -- XML/SGML writer module
- archive.pl -- Access several archive formats
- csv.pl -- Process CSV (Comma-Separated Values) data
- dialect.pl -- Support multiple Prolog dialects
- apply_macros.pl -- Goal expansion rules to avoid meta-calling
- prolog_code.pl -- Utilities for reasoning about code
- dif.pl -- The dif/2 constraint
- thread.pl -- High level thread primitives
- rdf_triple.pl -- Create triples from intermediate representation
- rdf_parser.pl
- rewrite_term.pl
- rbtrees.pl -- Red black trees
- nb_rbtrees.pl -- Non-backtrackable operations on red black trees
- pengines.pl -- Pengines: Web Logic Programming Made Easy
- yall.pl -- Lambda expressions
- sandbox.pl -- Sandboxed Prolog code
- prolog_format.pl -- Analyse format specifications
- random.pl -- Random numbers
- pengines_io.pl -- Provide Prolog I/O for HTML clients
- zlib.pl -- Zlib wrapper for SWI-Prolog
- bdb.pl -- Berkeley DB interface
- hash_stream.pl -- Maintain a hash on a stream
- md5.pl -- MD5 hashes
- pprint.pl -- Pretty Print Prolog terms
- modules.pl -- Module utility predicates
- lazy_lists.pl -- Lazy list handling
- edinburgh.pl -- Some traditional Edinburgh predicates
- prolog_clause.pl -- Get detailed source-information about a clause
- prolog_breakpoints.pl -- Manage Prolog break-points
- dicts.pl -- Dict utilities
- redis.pl -- Redis client
- prolog_profile.pl -- Execution profiler
- check.pl -- Consistency checking
- system.pl -- System utilities
- quintus.pl -- Quintus compatibility
- terms.pl -- Term manipulation
- charsio.pl -- I/O on Lists of Character Codes
- backcomp.pl -- Backward compatibility
- qsave.pl -- Save current program as a state or executable
- zip.pl -- Access resource ZIP archives
- tty.pl -- Terminal operations
- jpl.pl -- A Java interface for SWI Prolog 7.x
- prolog_debug.pl -- User level debugging tools
- term_to_json.pl
- protobufs.pl -- Google's Protocol Buffers ("protobufs")
- threadutil.pl -- Interactive thread utilities
- statistics.pl -- Get information about resource usage
- editline.pl -- BSD libedit based command line editing
- prolog_stack.pl -- Examine the Prolog stack
- sort.pl
- explain.pl -- Describe Prolog Terms
- odbc.pl
- doc_latex.pl -- PlDoc LaTeX backend
- plunit.pl -- Unit Testing
- streams.pl -- Manage Prolog streams
- ansi_term.pl -- Print decorated text to ANSI consoles
- writef.pl -- Old-style formatted write
- date.pl -- Process dates and times
- shell.pl -- Elementary shell commands
- xmldsig.pl -- XML Digital signature
- c14n2.pl -- C14n2 canonical XML documents
- xmlenc.pl -- XML encryption library
- listing.pl -- List programs and pretty print clauses
- snowball.pl -- The Snowball multi-lingual stemmer library
- unicode.pl -- Unicode string handling
- stomp.pl -- STOMP client.
- prolog_autoload.pl -- Autoload all dependencies
- wfs.pl -- Well Founded Semantics interface
- test_cover.pl -- Clause coverage analysis
- base32.pl -- Base32 encoding and decoding
- codesio.pl -- I/O on Lists of Character Codes
- coinduction.pl -- Co-Logic Programming
- heaps.pl -- heaps/priority queues
- varnumbers.pl -- Utilities for numbered terms
- when.pl -- Conditional coroutining
- prolog_codewalk.pl -- Prolog code walker
- paxos.pl -- A Replicated Data Store
- edit.pl -- Editor interface
- optparse.pl -- command line parsing
- intercept.pl -- Intercept and signal interface
- readline.pl -- GNU readline interface
- redis_streams.pl -- Using Redis streams
- increval.pl -- Incremental dynamic predicate modification
- tables.pl -- XSB interface to tables
- prolog_metainference.pl -- Infer meta-predicate properties
- double_metaphone.pl -- Phonetic string matching
- oset.pl -- Ordered set manipulation
- udp_broadcast.pl -- A UDP broadcast proxy
- table.pl
- yaml.pl -- Process YAML data
- isub.pl -- isub: a string similarity measure
- pwp.pl -- Prolog Well-formed Pages
- pdt_console.pl
- help.pl -- Text based manual
- doc_files.pl -- Create stand-alone documentation files
- prolog_stream.pl -- A stream with Prolog callbacks
- prolog_jiti.pl -- Just In Time Indexing (JITI) utilities
- portray_text.pl -- Portray text
- mqi.pl
- make.pl -- Reload modified source files
- strings.pl -- String utilities
- files.pl
- cgi.pl -- Read CGI parameters
- streampool.pl -- Input multiplexing
- fastrw.pl -- Fast reading and writing of terms
- hashtable.pl -- Hash tables
- prolog_trace.pl -- Print access to predicates
- prolog_history.pl -- Per-directory persistent commandline history
- win_menu.pl -- Console window menu
- rlimit.pl
- prolog_wrap.pl -- Wrapping predicates
- library
- process_set_method(+Method) is det
- Determine how the process is created on Unix systems. Method is one
of
spawn
(default),fork
orvfork
. If the method isspawn
but this cannot be used because it is either not supported by the OS or thecwd(Dir)
option is givenfork
is used.The problem is to be understood as follows. The official portable and safe method to create a process is using the
fork()
system call. This call however copies the process page tables and get seriously slow as the (Prolog) process is multiple giga bytes large. Alternatively, we may usevfork()
which avoids copying the process space. But, the safe usage as guaranteed by the POSIX standard ofvfork()
is insufficient for our purposes. On practical systems your mileage may vary. Modern posix systems also provideposix_spawn()
, which provides a safe and portable alternative for thefork()
andexec()
sequence that may be implemented usingfork()
or may use a fast but safe alternative. Unfortunatelyposix_spawn()
doesn't support the option to specify the working directory for the child and we cannot use working_directory/2 as the working directory is shared between threads.Summarizing, the default is safe and tries to be as fast as possible. On some scenarios and on some OSes it is possible to do better. It is generally a good idea to avoid using the
cwd(Dir)
option of process_create/3 as without we can useposix_spawn()
.