/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
* 2018, 2019, 2020
* Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#import "OFObject.h"
OF_ASSUME_NONNULL_BEGIN
/** @file */
#ifdef OF_HAVE_BLOCKS
/**
* @brief A block for a job which should be executed in a thread pool.
*/
typedef void (^of_thread_pool_block_t)(void);
#endif
@class OFCondition;
@class OFList OF_GENERIC(ObjectType);
@class OFMutableArray OF_GENERIC(ObjectType);
@class OFThreadPoolJob;
/**
* @class OFThreadPool OFThreadPool.h ObjFW/OFThreadPool.h
*
* @brief A class providing a pool of reusable threads.
*
* @note When the thread pool is released, all threads will terminate after
* they finish the job they are currently processing.
*/
OF_SUBCLASSING_RESTRICTED
@interface OFThreadPool: OFObject
{
size_t _size;
OFMutableArray *_threads;
volatile int _count;
#ifdef OF_THREAD_POOL_M
@public
#endif
OFList *_queue;
OFCondition *_queueCondition;
volatile int _doneCount;
OFCondition *_countCondition;
}
/**
* @brief The size of the thread pool.
*/
@property (readonly, nonatomic) size_t size;
/**
* @brief Returns a new thread pool with one thread for each core in the system.
*
* @warning If for some reason the number of cores in the system could not be
* determined, the pool will only have one thread!
*
* @return A new thread pool with one thread for each core in the system
*/
+ (instancetype)threadPool;
/**
* @brief Returns a new thread pool with the specified number of threads.
*
* @param size The number of threads for the pool
* @return A new thread pool with the specified number of threads
*/
+ (instancetype)threadPoolWithSize: (size_t)size;
/**
* @brief Initializes an already allocated OFThreadPool with the specified
* number of threads.
*
* @param size The number of threads for the pool
* @return An initialized OFThreadPool with the specified number of threads
*/
- (instancetype)initWithSize: (size_t)size OF_DESIGNATED_INITIALIZER;
/**
* @brief Execute the specified selector on the specified target with the
* specified object as soon as a thread is ready.
*
* @param target The target on which to perform the selector
* @param selector The selector to perform on the target
* @param object The object with which the selector is performed on the target
*/
- (void)dispatchWithTarget: (id)target
selector: (SEL)selector
object: (nullable id)object;
#ifdef OF_HAVE_BLOCKS
/**
* @brief Executes the specified block as soon as a thread is ready.
*
* @param block The block to execute
*/
- (void)dispatchWithBlock: (of_thread_pool_block_t)block;
#endif
/**
* @brief Waits until all jobs are done.
*/
- (void)waitUntilDone;
@end
OF_ASSUME_NONNULL_END