/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
* 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 "config.h"
#import "threading.h"
#if defined(OF_HAVE_PTHREADS)
# include "threading_pthread.m"
#elif defined(OF_WINDOWS)
# include "threading_winapi.m"
#else
# error No threads available!
#endif
#ifndef OF_HAVE_PTHREADS
void
of_once(of_once_t *control, void (*func)(void))
{
if (of_atomic_int_cmpswap(control, 0, 1)) {
func();
of_memory_barrier();
of_atomic_int_inc(control);
} else
while (*control == 1)
of_thread_yield();
}
#endif
#if !defined(OF_HAVE_RECURSIVE_PTHREAD_MUTEXES) && !defined(OF_WINDOWS)
bool
of_rmutex_new(of_rmutex_t *rmutex)
{
if (!of_mutex_new(&rmutex->mutex))
return false;
if (!of_tlskey_new(&rmutex->count))
return false;
return true;
}
bool
of_rmutex_lock(of_rmutex_t *rmutex)
{
uintptr_t count = (uintptr_t)of_tlskey_get(rmutex->count);
if (count > 0) {
if (!of_tlskey_set(rmutex->count, (void*)(count + 1)))
return false;
return true;
}
if (!of_mutex_lock(&rmutex->mutex))
return false;
if (!of_tlskey_set(rmutex->count, (void*)1)) {
of_mutex_unlock(&rmutex->mutex);
return false;
}
return true;
}
bool
of_rmutex_trylock(of_rmutex_t *rmutex)
{
uintptr_t count = (uintptr_t)of_tlskey_get(rmutex->count);
if (count > 0) {
if (!of_tlskey_set(rmutex->count, (void*)(count + 1)))
return false;
return true;
}
if (!of_mutex_trylock(&rmutex->mutex))
return false;
if (!of_tlskey_set(rmutex->count, (void*)1)) {
of_mutex_unlock(&rmutex->mutex);
return false;
}
return true;
}
bool
of_rmutex_unlock(of_rmutex_t *rmutex)
{
uintptr_t count = (uintptr_t)of_tlskey_get(rmutex->count);
if (count > 1) {
if (!of_tlskey_set(rmutex->count, (void*)(count - 1)))
return false;
return true;
}
if (!of_tlskey_set(rmutex->count, (void*)0))
return false;
if (!of_mutex_unlock(&rmutex->mutex))
return false;
return true;
}
bool
of_rmutex_free(of_rmutex_t *rmutex)
{
if (!of_mutex_free(&rmutex->mutex))
return false;
if (!of_tlskey_free(rmutex->count))
return false;
return true;
}
#endif