GDAL

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CPLWorkerThreadPool Class Reference

Pool of worker threads. More...

`#include <cpl_worker_thread_pool.h>`

## Public Member Functions
| CPLWorkerThreadPool ()
| Instantiate a new pool of worker threads. More...
| CPLWorkerThreadPool (int nThreads)
| Instantiate a new pool of worker threads. More...
| ~CPLWorkerThreadPool ()
| Destroys a pool of worker threads. More...
bool | Setup (int nThreads, CPLThreadFunc pfnInitFunc, void **pasInitData)
| Setup the pool. More...
bool | Setup (int nThreads, CPLThreadFunc pfnInitFunc, void **pasInitData, bool bWaitallStarted)
| Setup the pool. More...
CPLJobQueuePtr | CreateJobQueue ()
| Create a new job queue based on this worker thread pool. More...
bool | SubmitJob (std::function< void()> task)
| Queue a new job. More...
bool | SubmitJob (CPLThreadFunc pfnFunc, void *pData)
| Queue a new job. More...
bool | SubmitJobs (CPLThreadFunc pfnFunc, const std::vector< void * > &apData)
| Queue several jobs. More...
void | WaitCompletion (int nMaxRemainingJobs=0)
| Wait for completion of part or whole jobs. More...
void | WaitEvent ()
| Wait for completion of at least one job, if there are any remaining.
int | GetThreadCount () const
| Return the number of threads setup.

## Detailed Description

Pool of worker threads.

## Constructor & Destructor Documentation

## ◆ CPLWorkerThreadPool() [1/2]

CPLWorkerThreadPool::CPLWorkerThreadPool | ( |  | ) |

Instantiate a new pool of worker threads.

The pool is in an uninitialized state after this call. The Setup() method must be called.

## ◆ CPLWorkerThreadPool() [2/2]

CPLWorkerThreadPool::CPLWorkerThreadPool | ( | int | nThreads | ) |
| explicit

Instantiate a new pool of worker threads.

Parameters

  nThreads | Number of threads in the pool.

## ◆ ~CPLWorkerThreadPool()

CPLWorkerThreadPool::~CPLWorkerThreadPool | ( |  | ) |

Destroys a pool of worker threads.

Any still pending job will be completed before the destructor returns.

## Member Function Documentation

## ◆ CreateJobQueue()

std::unique_ptr< CPLJobQueue > CPLWorkerThreadPool::CreateJobQueue | ( |  | ) |

Create a new job queue based on this worker thread pool.

The worker thread pool must remain alive while the returned object is itself alive.

Since
  GDAL 3.2

## ◆ Setup() [1/2]

bool CPLWorkerThreadPool::Setup | ( | int | nThreads,
|  | CPLThreadFunc | pfnInitFunc,
|  | void ** | pasInitData
| ) |  |

Setup the pool.

Parameters

  nThreads | Number of threads to launch
  pfnInitFunc | Initialization function to run in each thread. May be NULL
  pasInitData | Array of initialization data. Its length must be nThreads, or it should be NULL.

Returns
  true if initialization was successful.

## ◆ Setup() [2/2]

bool CPLWorkerThreadPool::Setup | ( | int | nThreads,
|  | CPLThreadFunc | pfnInitFunc,
|  | void ** | pasInitData,
|  | bool | bWaitallStarted
| ) |  |

Setup the pool.

Parameters

  nThreads | Number of threads to launch
  pfnInitFunc | Initialization function to run in each thread. May be NULL
  pasInitData | Array of initialization data. Its length must be nThreads, or it should be NULL.
  bWaitallStarted | Whether to wait for all threads to be fully started.

Returns
  true if initialization was successful.

## ◆ SubmitJob() [1/2]

bool CPLWorkerThreadPool::SubmitJob | ( | CPLThreadFunc | pfnFunc,
|  | void * | pData
| ) |  |

Queue a new job.

Parameters

  pfnFunc | Function to run for the job.
  pData | User data to pass to the job function.

Returns
  true in case of success.

## ◆ SubmitJob() [2/2]

bool CPLWorkerThreadPool::SubmitJob | ( | std::function< void()> | task | ) |

Queue a new job.

Parameters

  task | Void function to execute.

Returns
  true in case of success.

if (!wt->hThread) { VSIFree(psJob); VSIFree(psItem); return false; }

## ◆ SubmitJobs()

bool CPLWorkerThreadPool::SubmitJobs | ( | CPLThreadFunc | pfnFunc,
|  | const std::vector< void * > & | apData
| ) |  |

Queue several jobs.

Parameters

  pfnFunc | Function to run for the job.
  apData | User data instances to pass to the job function.

Returns
  true in case of success.

## ◆ WaitCompletion()

void CPLWorkerThreadPool::WaitCompletion | ( | int | nMaxRemainingJobs = `0` | ) |

Wait for completion of part or whole jobs.

Parameters

  nMaxRemainingJobs | Maximum number of pendings jobs that are allowed in the queue after this method has completed. Might be 0 to wait for all jobs.

The documentation for this class was generated from the following files:

- cpl_worker_thread_pool.h
- cpl_worker_thread_pool.cpp