Artifact 1d8bb7f62333b976e035df60e714e7a0c32ed16e7a6776c549a31015e47375a8:
- File
src/OFThread.h
— part of check-in
[496695d778]
at
2019-09-29 19:35:38
on branch trunk
— Either restrict subclassing or reserve ivar space
This allows ABI stability with the fragile ABI. (user: js, size: 7898) [annotate] [blame] [check-ins using]
/* * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, * 2018, 2019 * Jonathan Schleifer <js@heap.zone> * * 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. */ #include <setjmp.h> #import "OFObject.h" #ifdef OF_HAVE_THREADS # import "thread.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 (^of_thread_block_t)(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 usesSockets 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> { # ifdef OF_THREAD_M @public # endif of_thread_t _thread; of_thread_attr_t _attr; enum of_thread_running { OF_THREAD_NOT_RUNNING, OF_THREAD_RUNNING, OF_THREAD_WAITING_FOR_JOIN } _running; void *_pool; # ifdef OF_HAVE_BLOCKS of_thread_block_t _Nullable _threadBlock; # endif jmp_buf _exitEnv; id _returnValue; @protected bool _supportsSockets; OFRunLoop *_Nullable _runLoop; OFMutableDictionary *_threadDictionary; @private OFString *_Nullable _name; # ifdef OF_HAVE_SOCKETS OFDNSResolver *_DNSResolver; # endif OF_RESERVE_IVARS(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) of_thread_block_t threadBlock; # 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). */ @property (nonatomic) float priority; /*! * @brief The stack size of the thread. * * @note This has to be set before the thread is started! */ @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. */ @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 threadBlock A block which is executed by the thread * @return A new, autoreleased thread */ + (instancetype)threadWithThreadBlock: (of_thread_block_t)threadBlock; # 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. * * @return The DNS resolver for the current thread */ + (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: (of_time_interval_t)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 */ + (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 threadBlock A block which is executed by the thread * @return An initialized OFThread. */ - (instancetype)initWithThreadBlock: (of_thread_block_t)threadBlock; # 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. */ - (void)start; /*! * @brief Joins a thread. * * @return The object returned by the main method of the thread. */ - (id)join; #else - (instancetype)init OF_UNAVAILABLE; #endif @end OF_ASSUME_NONNULL_END