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/*****************************************************************************
* Copyright (C) 2013-2020 MulticoreWare, Inc
*
* Authors: Steve Borho <steve@borho.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
*
* This program is also available under a commercial proprietary license.
* For more information, contact us at license @ x265.com
*****************************************************************************/
#include "common.h"
#include "threading.h"
#include "cpu.h"
namespace X265_NS {
// x265 private namespace
#if X265_ARCH_X86 && !defined(X86_64) && ENABLE_ASSEMBLY && defined(__GNUC__)
extern "C" intptr_t PFX(stack_align)(void (*func)(), ...);
#define STACK_ALIGN(func, ...) PFX(stack_align)((void (*)())func, __VA_ARGS__)
#else
#define STACK_ALIGN(func, ...) func(__VA_ARGS__)
#endif
#if NO_ATOMICS
pthread_mutex_t g_mutex = PTHREAD_MUTEX_INITIALIZER;
int no_atomic_or(int* ptr, int mask)
{
pthread_mutex_lock(&g_mutex);
int ret = *ptr;
*ptr |= mask;
pthread_mutex_unlock(&g_mutex);
return ret;
}
int no_atomic_and(int* ptr, int mask)
{
pthread_mutex_lock(&g_mutex);
int ret = *ptr;
*ptr &= mask;
pthread_mutex_unlock(&g_mutex);
return ret;
}
int no_atomic_inc(int* ptr)
{
pthread_mutex_lock(&g_mutex);
*ptr += 1;
int ret = *ptr;
pthread_mutex_unlock(&g_mutex);
return ret;
}
int no_atomic_dec(int* ptr)
{
pthread_mutex_lock(&g_mutex);
*ptr -= 1;
int ret = *ptr;
pthread_mutex_unlock(&g_mutex);
return ret;
}
int no_atomic_add(int* ptr, int val)
{
pthread_mutex_lock(&g_mutex);
*ptr += val;
int ret = *ptr;
pthread_mutex_unlock(&g_mutex);
return ret;
}
#endif
/* C shim for forced stack alignment */
static void stackAlignMain(Thread *instance)
{
// defer processing to the virtual function implemented in the derived class
instance->threadMain();
}
#if _WIN32
static DWORD WINAPI ThreadShim(Thread *instance)
{
STACK_ALIGN(stackAlignMain, instance);
return 0;
}
bool Thread::start()
{
DWORD threadId;
thread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ThreadShim, this, 0, &threadId);
return threadId > 0;
}
void Thread::stop()
{
if (thread)
WaitForSingleObject(thread, INFINITE);
}
Thread::~Thread()
{
if (thread)
CloseHandle(thread);
}
#else /* POSIX / pthreads */
static void *ThreadShim(void *opaque)
{
// defer processing to the virtual function implemented in the derived class
Thread *instance = reinterpret_cast<Thread *>(opaque);
STACK_ALIGN(stackAlignMain, instance);
return NULL;
}
bool Thread::start()
{
if (pthread_create(&thread, NULL, ThreadShim, this))
{
thread = 0;
return false;
}
return true;
}
void Thread::stop()
{
if (thread)
pthread_join(thread, NULL);
}
Thread::~Thread() {}
#endif // if _WIN32
Thread::Thread()
{
thread = 0;
}
}
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