/*****************************************************************************

 * 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;

}

}