//     Copyright 2017, Kay Hayen, mailto:kay.hayen@gmail.com
//
//     Part of "Nuitka", an optimizing Python compiler that is compatible and
//     integrates with CPython, but also works on its own.
//
//     Licensed under the Apache License, Version 2.0 (the "License");
//     you may not use this file except in compliance with the License.
//     You may obtain a copy of the License at
//
//        http://www.apache.org/licenses/LICENSE-2.0
//
//     Unless required by applicable law or agreed to in writing, software
//     distributed under the License is distributed on an "AS IS" BASIS,
//     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//     See the License for the specific language governing permissions and
//     limitations under the License.
//
#ifndef __NUITKA_FIBERS_H__
#define __NUITKA_FIBERS_H__

#if defined( _WIN32 )
#include <windows.h>
#elif defined( __OpenBSD__ )
#ifdef __cplusplus
extern "C" {
#endif
#include "coro.h"
#ifdef __cplusplus
}
#endif
#else
#include <ucontext.h>
#endif

typedef struct _Fiber
{
#if defined( _WIN32 )
    LPVOID fiber;
#elif defined( __OpenBSD__ )
    struct coro_context coro_ctx;
    void *sptr;
#else
    ucontext_t f_context;
    void *start_stack;
#endif
} Fiber;

#ifdef __cplusplus
extern "C" void _initFiber( Fiber *to );
extern "C" void _swapFiber( Fiber *to, Fiber *from );
extern "C" int _prepareFiber( Fiber *to, void *code, uintptr_t arg );
extern "C" void _releaseFiber( Fiber *to );
#else
void _initFiber( Fiber *to );
void _swapFiber( Fiber *to, Fiber *from );
int _prepareFiber( Fiber *to, void *code, uintptr_t arg );
void _releaseFiber( Fiber *to );
#endif

// Have centralized assertions as wrappers in debug mode, or directly access
// the fiber implementions of a given platform.
#ifdef __NUITKA_NO_ASSERT__
#define initFiber _initFiber
#define swapFiber _swapFiber
#define prepareFiber _prepareFiber
#define releaseFiber _releaseFiber
#else
static inline void initFiber( Fiber *to )
{
    assert( to );
    _initFiber( to );
}

static inline void swapFiber( Fiber *to, Fiber *from )
{
    assert( to != NULL );
    assert( from != NULL );

    _swapFiber( to, from );
}

static inline int prepareFiber( Fiber *to, void *code, uintptr_t arg )
{
    assert( to != NULL );
    assert( code != NULL );

    CHECK_OBJECT( (PyObject *)arg );

    return _prepareFiber( to, code, arg );
}

static inline void releaseFiber( Fiber *to )
{
    assert( to != NULL );

    _releaseFiber( to );
}
#endif

#endif
