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#include <stddef.h>
#ifndef PTHREADPOOL_H
#define PTHREADPOOL_H
typedef struct pthreadpool* pthreadpool_t;
typedef void (*pthreadpool_function_1d_t)(void*, size_t);
typedef void (*pthreadpool_function_1d_tiled_t)(void*, size_t, size_t);
typedef void (*pthreadpool_function_2d_t)(void*, size_t, size_t);
typedef void (*pthreadpool_function_2d_tiled_t)(void*, size_t, size_t, size_t, size_t);
typedef void (*pthreadpool_function_3d_t)(void*, size_t, size_t, size_t);
#ifdef __cplusplus
extern "C" {
#endif
/**
* Creates a thread pool with the specified number of threads.
*
* @param[in] threads_count The number of threads in the thread pool.
* A value of 0 has special interpretation: it creates a thread for each
* processor core available in the system.
*
* @returns A pointer to an opaque thread pool object.
* On error the function returns NULL and sets errno accordingly.
*/
pthreadpool_t pthreadpool_create(size_t threads_count);
/**
* Queries the number of threads in a thread pool.
*
* @param[in] threadpool The thread pool to query.
*
* @returns The number of threads in the thread pool.
*/
size_t pthreadpool_get_threads_count(pthreadpool_t threadpool);
/**
* Processes items in parallel using threads from a thread pool.
*
* When the call returns, all items have been processed and the thread pool is
* ready for a new task.
*
* @note If multiple threads call this function with the same thread pool, the
* calls are serialized.
*
* @param[in] threadpool The thread pool to use for parallelisation.
* @param[in] function The function to call for each item.
* @param[in] argument The first argument passed to the @a function.
* @param[in] items The number of items to process. The @a function
* will be called once for each item.
*/
void pthreadpool_compute_1d(
pthreadpool_t threadpool,
pthreadpool_function_1d_t function,
void* argument,
size_t range);
void pthreadpool_compute_1d_tiled(
pthreadpool_t threadpool,
pthreadpool_function_1d_tiled_t function,
void* argument,
size_t range,
size_t tile);
void pthreadpool_compute_2d(
pthreadpool_t threadpool,
pthreadpool_function_2d_t function,
void* argument,
size_t range_i,
size_t range_j);
void pthreadpool_compute_2d_tiled(
pthreadpool_t threadpool,
pthreadpool_function_2d_tiled_t function,
void* argument,
size_t range_i,
size_t range_j,
size_t tile_i,
size_t tile_j);
/**
* Terminates threads in the thread pool and releases associated resources.
*
* @warning Accessing the thread pool after a call to this function constitutes
* undefined behaviour and may cause data corruption.
*
* @param[in,out] threadpool The thread pool to destroy.
*/
void pthreadpool_destroy(pthreadpool_t threadpool);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* PTHREADPOOL_H */
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