/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3.0 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* version 3.0 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3.0 along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include <setjmp.h>
#import "OFObject.h"
#ifdef OF_HAVE_THREADS
# import "OFPlainThread.h"
#endif
OF_ASSUME_NONNULL_BEGIN
/** @file */
@class OFDate;
#ifdef OF_HAVE_SOCKETS
@class OFDNSResolver;
#endif
@class OFRunLoop;
@class OFMutableDictionary OF_GENERIC(KeyType, ObjectType);
#if defined(OF_HAVE_THREADS) && defined(OF_HAVE_BLOCKS)
/**
* @brief A block to be executed in a new thread.
*
* @return The object which should be returned when the thread is joined
*/
typedef id _Nullable (^OFThreadBlock)(void);
#endif
/**
* @class OFThread OFThread.h ObjFW/OFThread.h
*
* @brief A class which provides portable threads.
*
* To use it, you should create a new class derived from it and reimplement
* main.
*
* @warning Some operating systems such as AmigaOS need special per-thread
* initialization of sockets. If you intend to use sockets in the
* thread, set the @ref supportsSockets property to true before
* starting it.
*
* @warning Even though the OFCopying protocol is implemented, it does *not*
* return an independent copy of the thread, but instead retains it.
* This is so that the thread can be used as a key for a dictionary,
* so context can be associated with a thread.
*/
@interface OFThread: OFObject
#ifdef OF_HAVE_THREADS
<OFCopying>
{
@private
OFPlainThread _thread;
OFPlainThreadAttributes _attr;
enum OFThreadState {
OFThreadStateNotRunning,
OFThreadStateRunning,
OFThreadStateWaitingForJoin
} _running;
# ifndef OF_OBJFW_RUNTIME
void *_pool;
# endif
# ifdef OF_HAVE_BLOCKS
OFThreadBlock _Nullable _block;
# endif
jmp_buf _exitEnv;
id _returnValue;
bool _supportsSockets;
OFRunLoop *_Nullable _runLoop;
OFMutableDictionary *_threadDictionary;
OFString *_Nullable _name;
# ifdef OF_HAVE_SOCKETS
OFDNSResolver *_DNSResolver;
# endif
OF_RESERVE_IVARS(OFThread, 4)
}
#endif
#ifdef OF_HAVE_CLASS_PROPERTIES
# ifdef OF_HAVE_THREADS
@property (class, readonly, nullable, nonatomic) OFThread *currentThread;
@property (class, readonly, nullable, nonatomic) OFThread *mainThread;
@property (class, readonly, nonatomic) bool isMainThread;
@property (class, readonly, nullable, nonatomic)
OFMutableDictionary *threadDictionary;
@property (class, nullable, copy, nonatomic) OFString *name;
# endif
# ifdef OF_HAVE_SOCKETS
@property (class, readonly, nonatomic) OFDNSResolver *DNSResolver;
# endif
#endif
#ifdef OF_HAVE_THREADS
/**
* @brief The name for the thread to use when starting it.
*
* @note While this can be changed after the thread has been started, it will
* have no effect once the thread started. If you want to change the name
* of the current thread after it has been started, look at the class
* method @ref setName:.
*/
@property OF_NULLABLE_PROPERTY (copy) OFString *name;
# ifdef OF_HAVE_BLOCKS
/**
* @brief The block to execute in the thread.
*/
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFThreadBlock block;
# endif
/**
* @brief The run loop for the thread.
*/
@property (readonly, nonatomic) OFRunLoop *runLoop;
/**
* @brief The priority of the thread.
*
* @note This has to be set before the thread is started!
*
* This is a value between -1.0 (meaning lowest priority that still schedules)
* and +1.0 (meaning highest priority that still allows getting preempted)
* with normal priority being 0.0 (meaning being the same as the main thread).
*
* @throw OFThreadStillRunningException The thread is already/still running and
* thus the priority cannot be changed
*/
@property (nonatomic) float priority;
/**
* @brief The stack size of the thread.
*
* @note This has to be set before the thread is started!
*
* @throw OFThreadStillRunningException The thread is already/still running and
* thus the stack size cannot be changed
*/
@property (nonatomic) size_t stackSize;
/**
* @brief Whether the thread supports sockets.
*
* Some operating systems such as AmigaOS need special per-thread
* initialization of sockets. If you intend to use sockets in the thread, set
* this property to true before starting the thread.
*
* @throw OFThreadStillRunningException The thread is already/still running and
* thus the sockets support cannot be
* enabled/disabled
*/
@property (nonatomic) bool supportsSockets;
/**
* @brief Creates a new thread.
*
* @return A new, autoreleased thread
*/
+ (instancetype)thread;
# ifdef OF_HAVE_BLOCKS
/**
* @brief Creates a new thread with the specified block.
*
* @param block A block which is executed by the thread
* @return A new, autoreleased thread
*/
+ (instancetype)threadWithBlock: (OFThreadBlock)block;
# endif
/**
* @brief Returns the current thread.
*
* @return The current thread
*/
+ (nullable OFThread *)currentThread;
/**
* @brief Returns the main thread.
*
* @return The main thread
*/
+ (nullable OFThread *)mainThread;
/**
* @brief Returns whether the current thread is the main thread.
*
* @return Whether the current thread is the main thread.
*/
+ (bool)isMainThread;
/**
* @brief Returns a dictionary to store thread-specific data, meaning it
* returns a different dictionary for every thread.
*
* @return A dictionary to store thread-specific data
*/
+ (nullable OFMutableDictionary *)threadDictionary;
#endif
#ifdef OF_HAVE_SOCKETS
/**
* @brief Returns the DNS resolver for the current thread.
*
* Constructs the DNS resolver is there is none yet, unless @ref currentThread
* is `nil`, in which case it returns `nil`.
*
* @return The DNS resolver for the current thread
*/
+ (nullable OFDNSResolver *)DNSResolver;
#endif
/**
* @brief Suspends execution of the current thread for the specified time
* interval.
*
* @param timeInterval The number of seconds to sleep
*/
+ (void)sleepForTimeInterval: (OFTimeInterval)timeInterval;
/**
* @brief Suspends execution of the current thread until the specified date.
*
* @param date The date to wait for
*/
+ (void)sleepUntilDate: (OFDate *)date;
/**
* @brief Yields a processor voluntarily and moves the thread to the end of the
* queue for its priority.
*/
+ (void)yield;
#ifdef OF_HAVE_THREADS
/**
* @brief Terminates the current thread, letting it return `nil`.
*/
+ (void)terminate OF_NO_RETURN;
/**
* @brief Terminates the current thread, letting it return the specified object.
*
* @param object The object which the terminated thread will return
* @throw OFInvalidArgumentException The method was called from the main thread
*/
+ (void)terminateWithObject: (nullable id)object OF_NO_RETURN;
/**
* @brief Sets the name of the current thread.
*
* Unlike the instance method, this can be used after the thread has been
* started.
*
* @param name The new name for the current thread.
*/
+ (void)setName: (nullable OFString *)name;
/**
* @brief Returns the name of the current thread.
*
* @return The name of the current thread.
*/
+ (nullable OFString *)name;
# ifdef OF_HAVE_BLOCKS
/**
* @brief Initializes an already allocated thread with the specified block.
*
* @param block A block which is executed by the thread
* @return An initialized OFThread.
*/
- (instancetype)initWithBlock: (OFThreadBlock)block;
# endif
/**
* @brief The main routine of the thread. You need to reimplement this!
*
* @return The object the join method should return when called for this thread
*/
- (nullable id)main;
/**
* @brief This routine is executed when the thread's main method has finished
* executing or terminate has been called.
*
* @note Be sure to call `[super handleTermination]`!
*/
- (void)handleTermination OF_REQUIRES_SUPER;
/**
* @brief Starts the thread.
*
* @throw OFStartThreadFailedException Starting the thread failed
* @throw OFThreadStillRunningException The thread is still running
*/
- (void)start;
/**
* @brief Joins a thread.
*
* @return The object returned by the main method of the thread.
* @throw OFJoinThreadFailedException Joining the thread failed
*/
- (id)join;
#else
- (instancetype)init OF_UNAVAILABLE;
#endif
@end
OF_ASSUME_NONNULL_END