- swipl-7.5.1
- library
- doc_http.pl -- Documentation server
- pldoc.pl -- Process source documentation
- lists.pl -- List Manipulation
- error.pl -- Error generating support
- pairs.pl -- Operations on key-value lists
- apply.pl -- Apply predicates on a list
- memfile.pl
- shlib.pl -- Utility library for loading foreign objects (DLLs, shared objects)
- operators.pl -- Manage operators
- debug.pl -- Print debug messages and test assertions
- option.pl -- Option list processing
- prolog_source.pl -- Examine Prolog source-files
- socket.pl -- Network socket (TCP and UDP) library
- thread_pool.pl -- Resource bounded thread management
- rbtrees.pl -- Red black trees
- gensym.pl -- Generate unique symbols
- readutil.pl -- Read utilities
- url.pl -- Analysing and constructing URL
- utf8.pl -- UTF-8 encoding/decoding on lists of character codes.
- uri.pl -- Process URIs
- settings.pl -- Setting management
- broadcast.pl -- Event service
- arithmetic.pl -- Extensible arithmetic
- sgml.pl -- SGML, XML and HTML parser
- iostream.pl -- Utilities to deal with streams
- dialect.pl -- Support multiple Prolog dialects
- quasi_quotations.pl -- Define Quasi Quotation syntax
- pure_input.pl -- Pure Input from files and streams
- time.pl -- Time and alarm library
- base64.pl -- Base64 encoding and decoding
- aggregate.pl -- Aggregation operators on backtrackable predicates
- ordsets.pl -- Ordered set manipulation
- oset.pl -- Ordered set manipulation
- www_browser.pl -- Open a URL in the users browser
- process.pl -- Create processes and redirect I/O
- prolog_colour.pl -- Prolog syntax colouring support.
- prolog_xref.pl -- Prolog cross-referencer data collection
- predicate_options.pl -- Access and analyse predicate options
- prolog_clause.pl -- Get detailed source-information about a clause
- occurs.pl -- Finding and counting sub-terms
- listing.pl -- List programs and pretty print clauses
- record.pl -- Access compound arguments by name
- assoc.pl -- Binary associations
- ugraphs.pl -- Graph manipulation library
- filesex.pl -- Extended operations on files
- xpath.pl -- Select nodes in an XML DOM
- prolog_pack.pl -- A package manager for Prolog
- archive.pl -- Access several archive formats
- rdf.pl
- rdf_parser.pl
- rewrite.pl
- quintus.pl -- Quintus compatibility
- rdf_triple.pl -- Create triples from intermediate representation
- sgml_write.pl -- XML/SGML writer module
- xsdp_types.pl -- XML-Schema primitive types
- thread.pl -- High level thread primitives
- git.pl -- Run GIT commands
- ctypes.pl -- Character code classification
- sha.pl -- SHA secure hashes
- crypt.pl
- persistency.pl -- Provide persistent dynamic predicates
- tty.pl -- Terminal operations
- terms.pl -- Term manipulation
- snowball.pl -- The Snowball multi-lingual stemmer library
- sandbox.pl -- Sandboxed Prolog code
- prolog_format.pl -- Analyse format specifications
- when.pl -- Conditional coroutining
- apply_macros.pl -- Goal expansion rules to avoid meta-calling
- double_metaphone.pl -- Phonetic string matching
- porter_stem.pl
- nb_set.pl -- Non-backtrackable sets
- solution_sequences.pl -- Modify solution sequences
- uuid.pl -- Universally Unique Identifier (UUID) Library
- system.pl -- System utilities
- edinburgh.pl -- Some traditional Edinburgh predicates
- helpidx.pl
- explain.pl -- Describe Prolog Terms
- edit.pl -- Editor interface
- make.pl -- Reload modified source files
- check.pl -- Consistency checking
- prolog_codewalk.pl -- Prolog code walker
- prolog_metainference.pl -- Infer meta-predicate properties
- prolog_breakpoints.pl -- Manage Prolog break-points
- threadutil.pl -- Interactive thread utilities
- statistics.pl -- Get information about resource usage
- help.pl
- backcomp.pl -- Backward compatibility
- rdf_write.pl -- Write RDF/XML from a list of triples
- date.pl -- Process dates and times
- zlib.pl -- Zlib wrapper for SWI-Prolog
- rdf_ntriples.pl -- RDF N-triples parser (obsolete)
- csv.pl -- Process CSV (Comma-Separated Values) data
- dif.pl -- The dif/2 constraint
- ssl.pl -- Secure Socket Layer (SSL) library
- crypto.pl -- Cryptography and authentication library
- ansi_term.pl -- Print decorated text to ANSI consoles
- prolog_stack.pl -- Examine the Prolog stack
- pengines.pl -- Pengines: Web Logic Programming Made Easy
- charsio.pl -- I/O on Lists of Character Codes
- modules.pl -- Module utility predicates
- term_to_json.pl
- editline.pl -- BSD libedit based command line editing
- console_input.pl
- prolog_history.pl -- Per-directory persistent commandline history
- base32.pl -- Base32 encoding and decoding
- table.pl
- xmlenc.pl -- XML encryption library
- bdb.pl -- Berkeley DB interface
- chr.pl
- sort.pl
- doc_files.pl -- Create stand-alone documentation files
- odbc.pl
- unicode.pl -- Unicode string handling
- writef.pl -- Old-style formatted write
- udp_broadcast.pl -- A UDP Broadcast Bridge
- plunit.pl -- Unit Testing
- readline.pl -- GNU readline interface
- cgi.pl -- Read CGI parameters
- uid.pl -- User and group management on Unix systems
- protobufs.pl -- Google's Protocol Buffers
- yall.pl -- Lambda expressions
- optparse.pl -- command line parsing
- tabling.pl -- Tabled execution (SLG WAM)
- random.pl -- Random numbers
- streampool.pl
- pengines_io.pl -- Provide Prolog I/O for HTML clients
- prolog_stream.pl -- A stream with Prolog callbacks
- unix.pl -- Unix specific operations
- dicts.pl -- Dict utilities
- xmldsig.pl -- XML Digital signature
- c14n2.pl -- C14n2 canonical XML documents
- pdt_console.pl
- isub.pl -- isub: a string similarity measure
- shell.pl -- Elementary shell commands
- doc_latex.pl -- PlDoc LaTeX backend
- qsave.pl -- Save current program as a state or executable
- prolog_autoload.pl -- Autoload all dependencies
- pwp.pl -- Prolog Well-formed Pages
- md5.pl -- MD5 hashes
- files.pl
- syslog.pl -- Unix syslog interface
- test_cover.pl -- Clause cover analysis
- main.pl -- Provide entry point for scripts
- varnumbers.pl -- Utilities for numbered terms
- win_menu.pl -- Console window menu
- hash_stream.pl -- Maintain a hash on a stream
- rlimit.pl
- library
- concurrent(+N, :Goals, Options) is semidet
- Run Goals in parallel using N threads. This call blocks until
all work has been done. The Goals must be independent. They
should not communicate using shared variables or any form of
global data. All Goals must be thread-safe.
Execution succeeds if all goals have succeeded. If one goal fails or throws an exception, other workers are abandoned as soon as possible and the entire computation fails or re-throws the exception. Note that if multiple goals fail or raise an error it is not defined which error or failure is reported.
On successful completion, variable bindings are returned. Note however that threads have independent stacks and therefore the goal is copied to the worker thread and the result is copied back to the caller of concurrent/3.
Choosing the right number of threads is not always obvious. Here are some scenarios:
- If the goals are CPU intensive and normally all succeeding, typically the number of CPUs is the optimal number of threads. Less does not use all CPUs, more wastes time in context switches and also uses more memory.
- If the tasks are I/O bound the number of threads is typically higher than the number of CPUs.
- If one or more of the goals may fail or produce an errors, using a higher number of threads may find this earlier.
- Arguments:
-
N - Number of worker-threads to create. Using 1, no threads are created. If N is larger than the number of Goals we create exactly as many threads as there are Goals. Goals - List of callable terms. Options - Passed to thread_create/3 for creating the workers. Only options changing the stack-sizes can be used. In particular, do not pass the detached or alias options. - See also
- - In many cases, concurrent_maplist/2 and friends is easier to program and is tractable to program analysis.