Parallel portfolio engine implementation. More...
#include <pbs.hh>
Public Member Functions | |
PBS (Engine **s, Stop **so, unsigned int n, const Statistics &stat) | |
Initialize. | |
virtual Space * | next (void) |
Return next solution (NULL, if none exists or search has been stopped) | |
virtual Statistics | statistics (void) const |
Return statistics. | |
virtual bool | stopped (void) const |
Check whether engine has been stopped. | |
virtual void | constrain (const Space &b) |
Constrain future solutions to be better than b. | |
virtual | ~PBS (void) |
Destructor. | |
Public Member Functions inherited from Gecode::Search::Par::Engine< Tracer > | |
const Options & | opt (void) const |
Provide access to search options. | |
unsigned int | workers (void) const |
Return number of workers. | |
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. | |
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. | |
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. | |
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. | |
Engine (const Options &o) | |
Initialize with options o. | |
Public Member Functions inherited from Gecode::Search::Engine | |
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 Member Functions | |
bool | report (Slave< Collect > *slave, Space *s) |
Process report from slave, return false if solution was ignored. | |
bool | signal (void) const |
Whether search state changed such that signal is needed. |
Protected Attributes | |
Statistics | stat |
Master statistics. | |
Slave< Collect > ** | slaves |
Slave engines. | |
unsigned int | n_slaves |
Number of slave engines. | |
unsigned int | n_active |
Number of active slave engines. | |
bool | slave_stop |
Whether a slave has been stopped. | |
volatile bool | tostop |
Shared stop flag. | |
Collect | solutions |
Collect solutions in this. | |
Support::Mutex | m |
Mutex for synchronization. | |
unsigned int | n_busy |
Number of busy slaves. | |
Support::Event | idle |
Signal that number of busy slaves becomes zero. | |
Protected Attributes inherited from Gecode::Search::Par::Engine< Tracer > | |
Options | _opt |
Search options. | |
volatile Cmd | _cmd |
The current command. | |
Support::Mutex | _m_wait |
Mutex for forcing workers to wait. | |
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) | |
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. | |
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. |
Additional Inherited Members | |
Public Types inherited from Gecode::Search::Par::Engine< Tracer > | |
enum | Cmd { C_WORK , C_WAIT , C_RESET , C_TERMINATE } |
Commands from engine to workers. More... | |
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 portfolio engine implementation.
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Initialize.
The key invariant of the engine is as follows:
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Return next solution (NULL, if none exists or search has been stopped)
Reimplemented from Gecode::Search::Par::Engine< Tracer >.
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Check whether engine has been stopped.
Reimplemented from Gecode::Search::Par::Engine< Tracer >.
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Constrain future solutions to be better than b.
Reimplemented from Gecode::Search::Engine.
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