Artifact 3ce1164040c5a39ae9dbf6ff725abb97d2db03c51ec098e37560dffc02f586c8:
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src/threading.h
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2016-01-03 00:41:26
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/* * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 * 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 "objfw-defs.h" #include "platform.h" #if !defined(OF_HAVE_THREADS) || \ (!defined(OF_HAVE_PTHREADS) && !defined(OF_WINDOWS)) # error No threads available! #endif #include <math.h> #import "OFObject.h" #if defined(OF_HAVE_PTHREADS) # include <pthread.h> # include <sched.h> typedef pthread_t of_thread_t; typedef pthread_key_t of_tlskey_t; typedef pthread_mutex_t of_mutex_t; typedef pthread_cond_t of_condition_t; typedef pthread_once_t of_once_t; # define OF_ONCE_INIT PTHREAD_ONCE_INIT #elif defined(OF_WINDOWS) /* * winsock2.h needs to be included before windows.h. Not including it here * would make it impossible to use sockets after threading.h has been * imported. */ # ifdef OF_HAVE_SOCKETS # include <winsock2.h> # endif # include <windows.h> typedef HANDLE of_thread_t; typedef DWORD of_tlskey_t; typedef CRITICAL_SECTION of_mutex_t; typedef struct { HANDLE event; int count; } of_condition_t; typedef volatile LONG of_once_t; # define OF_ONCE_INIT 0 #else # error No threads available! #endif #if defined(OF_HAVE_ATOMIC_OPS) # import "atomic.h" typedef volatile int of_spinlock_t; # define OF_SPINCOUNT 10 #elif defined(OF_HAVE_PTHREAD_SPINLOCKS) typedef pthread_spinlock_t of_spinlock_t; #else typedef of_mutex_t of_spinlock_t; #endif #ifdef OF_HAVE_SCHED_YIELD # include <sched.h> #endif #if defined(OF_HAVE_RECURSIVE_PTHREAD_MUTEXES) || defined(OF_WINDOWS) # define of_rmutex_t of_mutex_t #else typedef struct { of_mutex_t mutex; of_tlskey_t count; } of_rmutex_t; #endif typedef struct of_thread_attr_t { float priority; size_t stackSize; } of_thread_attr_t; #if defined(OF_HAVE_PTHREADS) # define of_thread_is_current(t) pthread_equal(t, pthread_self()) # define of_thread_current pthread_self #elif defined(OF_WINDOWS) # define of_thread_is_current(t) (t == GetCurrentThread()) # define of_thread_current GetCurrentThread #else # error of_thread_is_current not implemented! # error of_thread_current not implemented! #endif extern bool of_thread_attr_init(of_thread_attr_t *attr); extern bool of_thread_new(of_thread_t *thread, void (*function)(id), id object, const of_thread_attr_t *attr); extern void of_thread_set_name(of_thread_t thread, const char *name); extern bool of_thread_join(of_thread_t thread); extern bool of_thread_detach(of_thread_t thread); extern void OF_NO_RETURN_FUNC of_thread_exit(void); extern void of_once(of_once_t *control, void (*func)(void)); extern bool of_mutex_new(of_mutex_t *mutex); extern bool of_mutex_lock(of_mutex_t *mutex); extern bool of_mutex_trylock(of_mutex_t *mutex); extern bool of_mutex_unlock(of_mutex_t *mutex); extern bool of_mutex_free(of_mutex_t *mutex); extern bool of_rmutex_new(of_rmutex_t *rmutex); extern bool of_rmutex_lock(of_rmutex_t *rmutex); extern bool of_rmutex_trylock(of_rmutex_t *rmutex); extern bool of_rmutex_unlock(of_rmutex_t *rmutex); extern bool of_rmutex_free(of_rmutex_t *rmutex); extern bool of_condition_new(of_condition_t *condition); extern bool of_condition_signal(of_condition_t *condition); extern bool of_condition_broadcast(of_condition_t *condition); extern bool of_condition_wait(of_condition_t *condition, of_mutex_t *mutex); extern bool of_condition_timed_wait(of_condition_t *condition, of_mutex_t *mutex, of_time_interval_t timeout); extern bool of_condition_free(of_condition_t *condition); /* TLS keys and spinlocks are inlined for performance. */ static OF_INLINE bool of_tlskey_new(of_tlskey_t *key) { #if defined(OF_HAVE_PTHREADS) return !pthread_key_create(key, NULL); #elif defined(OF_WINDOWS) return ((*key = TlsAlloc()) != TLS_OUT_OF_INDEXES); #else # error of_tlskey_new not implemented! #endif } static OF_INLINE void* of_tlskey_get(of_tlskey_t key) { #if defined(OF_HAVE_PTHREADS) return pthread_getspecific(key); #elif defined(OF_WINDOWS) return TlsGetValue(key); #else # error of_tlskey_get not implemented! #endif } static OF_INLINE bool of_tlskey_set(of_tlskey_t key, void *ptr) { #if defined(OF_HAVE_PTHREADS) return !pthread_setspecific(key, ptr); #elif defined(OF_WINDOWS) return TlsSetValue(key, ptr); #else # error of_tlskey_set not implemented! #endif } static OF_INLINE bool of_tlskey_free(of_tlskey_t key) { #if defined(OF_HAVE_PTHREADS) return !pthread_key_delete(key); #elif defined(OF_WINDOWS) return TlsFree(key); #else # error of_tlskey_free not implemented! #endif } static OF_INLINE bool of_spinlock_new(of_spinlock_t *spinlock) { #if defined(OF_HAVE_ATOMIC_OPS) *spinlock = 0; return true; #elif defined(OF_HAVE_PTHREAD_SPINLOCKS) return !pthread_spin_init(spinlock, 0); #else return of_mutex_new(spinlock); #endif } static OF_INLINE bool of_spinlock_trylock(of_spinlock_t *spinlock) { #if defined(OF_HAVE_ATOMIC_OPS) return of_atomic_int_cmpswap(spinlock, 0, 1); #elif defined(OF_HAVE_PTHREAD_SPINLOCKS) return !pthread_spin_trylock(spinlock); #else return of_mutex_trylock(spinlock); #endif } static OF_INLINE bool of_spinlock_lock(of_spinlock_t *spinlock) { #if defined(OF_HAVE_ATOMIC_OPS) # if defined(OF_HAVE_SCHED_YIELD) || defined(OF_WINDOWS) int i; for (i = 0; i < OF_SPINCOUNT; i++) if (of_spinlock_trylock(spinlock)) return true; while (!of_spinlock_trylock(spinlock)) # ifndef OF_WINDOWS sched_yield(); # else Sleep(0); # endif # else while (!of_spinlock_trylock(spinlock)); # endif return true; #elif defined(OF_HAVE_PTHREAD_SPINLOCKS) return !pthread_spin_lock(spinlock); #else return of_mutex_lock(spinlock); #endif } static OF_INLINE bool of_spinlock_unlock(of_spinlock_t *spinlock) { #if defined(OF_HAVE_ATOMIC_OPS) return of_atomic_int_cmpswap(spinlock, 1, 0); #elif defined(OF_HAVE_PTHREAD_SPINLOCKS) return !pthread_spin_unlock(spinlock); #else return of_mutex_unlock(spinlock); #endif } static OF_INLINE bool of_spinlock_free(of_spinlock_t *spinlock) { #if defined(OF_HAVE_ATOMIC_OPS) return true; #elif defined(OF_HAVE_PTHREAD_SPINLOCKS) return !pthread_spin_destroy(spinlock); #else return of_mutex_free(spinlock); #endif }