
Parallel depth-first search engine More...
#include <engine.hh>
Classes | |
| class | Worker |
| Parallel depth-first search worker More... | |
Public Member Functions | |
| const Options & | opt (void) const |
| Provide access to search options. | |
| unsigned int | workers (void) const |
| Return number of workers. | |
| Public Member Functions inherited from Gecode::Search::Engine | |
| virtual Statistics | statistics (void) const =0 |
| Return statistics. | |
| virtual void | constrain (const Space &b) |
| Constrain future solutions to be better than b (raises exception) | |
| virtual void | reset (Space *s) |
| Reset engine to restart at space s (does nothing) | |
| virtual NoGoods & | nogoods (void) |
| Return no-goods (the no-goods are empty) | |
| virtual | ~Engine (void) |
| Destructor. | |
| Public Member Functions inherited from Gecode::Support::Terminator | |
| virtual | ~Terminator () |
| Destructor. | |
Protected Attributes | |
| Options | _opt |
| Search options. | |
Commands from engine to workers and wait management | |
| enum | Cmd { C_WORK , C_WAIT , C_RESET , C_TERMINATE } |
| Commands from engine to workers. More... | |
| volatile Cmd | _cmd |
| The current command. | |
| Support::Mutex | _m_wait |
| Mutex for forcing workers to wait. | |
| Cmd | cmd (void) const |
| Return current command. | |
| void | block (void) |
| Block all workers. | |
| void | release (Cmd c) |
| Release all workers. | |
| void | wait (void) |
| Ensure that worker waits. | |
Termination control | |
| Support::Mutex | _m_term |
| Mutex for access to termination information. | |
| volatile unsigned int | _n_term_not_ack |
| Number of workers that have not yet acknowledged termination. | |
| Support::Event | _e_term_ack |
| Event for termination acknowledgment. | |
| Support::Mutex | _m_wait_terminate |
| Mutex for waiting for termination. | |
| volatile unsigned int | _n_not_terminated |
| Number of not yet terminated workers. | |
| Support::Event | _e_terminate |
| Event for termination (all threads have terminated) | |
| void | ack_terminate (void) |
| For worker to acknowledge termination command. | |
| virtual void | terminated (void) |
| For worker to register termination. | |
| void | wait_terminate (void) |
| For worker to wait until termination is legal. | |
| void | terminate (void) |
| For engine to peform thread termination. | |
Reset control | |
| Support::Mutex | _m_reset |
| Mutex for access to reset information. | |
| volatile unsigned int | _n_reset_not_ack |
| Number of workers that have not yet acknowledged reset. | |
| Support::Event | e_reset_ack_start |
| Event for reset acknowledgment started. | |
| Support::Event | e_reset_ack_stop |
| Event for reset acknowledgment stopped. | |
| Support::Mutex | m_wait_reset |
| Mutex for waiting for reset. | |
| void | ack_reset_start (void) |
| For worker to acknowledge start of reset cycle. | |
| void | ack_reset_stop (void) |
| For worker to acknowledge stop of reset cycle. | |
| void | wait_reset (void) |
| For worker to wait for all workers to reset. | |
Search control | |
| Support::Mutex | m_search |
| Mutex for search. | |
| Support::Event | e_search |
| Event for search (solution found, no more solutions, search stopped) | |
| Support::DynamicQueue< Space *, Heap > | solutions |
| Queue of solutions. | |
| volatile unsigned int | n_busy |
| Number of busy workers. | |
| volatile bool | has_stopped |
| Whether a worker had been stopped. | |
| void | idle (void) |
| Report that worker is idle. | |
| void | busy (void) |
| Report that worker is busy. | |
| void | stop (void) |
| Report that worker has been stopped. | |
| bool | signal (void) const |
| Whether search state changed such that signal is needed. | |
Engine interface | |
| Engine (const Options &o) | |
| Initialize with options o. | |
| virtual Space * | next (void) |
| Return next solution (NULL, if none exists or search has been stopped) | |
| virtual bool | stopped (void) const |
| Check whether engine has been stopped. | |
Additional Inherited Members | |
| Static Public Member Functions inherited from Gecode::HeapAllocated | |
| static void * | operator new (size_t s) |
| Memory management. | |
| static void | operator delete (void *p) |
| Free memory allocated from heap. | |
Parallel depth-first search engine
| enum Gecode::Search::Par::Engine::Cmd |
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Initialize with options o.
Definition at line 116 of file engine.hpp.
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Provide access to search options.
Definition at line 47 of file engine.hpp.
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Return number of workers.
Definition at line 52 of file engine.hpp.
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Return current command.
Definition at line 68 of file engine.hpp.
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Block all workers.
Definition at line 73 of file engine.hpp.
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Release all workers.
Definition at line 79 of file engine.hpp.
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Ensure that worker waits.
Definition at line 85 of file engine.hpp.
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For worker to acknowledge termination command.
Definition at line 200 of file engine.hpp.
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For worker to register termination.
Implements Gecode::Support::Terminator.
Definition at line 187 of file engine.hpp.
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For worker to wait until termination is legal.
Definition at line 209 of file engine.hpp.
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For engine to peform thread termination.
Definition at line 216 of file engine.hpp.
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For worker to acknowledge start of reset cycle.
Definition at line 235 of file engine.hpp.
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For worker to acknowledge stop of reset cycle.
Definition at line 244 of file engine.hpp.
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For worker to wait for all workers to reset.
Definition at line 253 of file engine.hpp.
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Whether search state changed such that signal is needed.
Definition at line 147 of file engine.hpp.
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Report that worker is idle.
Definition at line 152 of file engine.hpp.
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Report that worker is busy.
Definition at line 163 of file engine.hpp.
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Report that worker has been stopped.
Definition at line 172 of file engine.hpp.
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Return next solution (NULL, if none exists or search has been stopped)
Implements Gecode::Search::Engine.
Reimplemented in Gecode::Search::Par::PBS< Collect >, and Gecode::Search::Par::PBS< Gecode::Search::Par::CollectBest >.
Definition at line 298 of file engine.hpp.
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inlinevirtual |
Check whether engine has been stopped.
Implements Gecode::Search::Engine.
Reimplemented in Gecode::Search::Par::PBS< Collect >, and Gecode::Search::Par::PBS< Gecode::Search::Par::CollectBest >.
Definition at line 57 of file engine.hpp.
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