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/*
* This file is part of the "Coroutine" project and released under the MIT License.
*
* Created by Samuel Williams on 10/5/2018.
* Copyright, 2018, by Samuel Williams. All rights reserved.
*/
#pragma once
#include <assert.h>
#include <string.h>
#if __cplusplus
extern "C" {
#endif
#define COROUTINE __declspec(noreturn) void __fastcall
/* This doesn't include thread information block */
enum {COROUTINE_REGISTERS = 4};
typedef struct
{
void **stack_pointer;
} coroutine_context;
typedef void(__fastcall * coroutine_start)(coroutine_context *from, coroutine_context *self);
static inline void coroutine_initialize(
coroutine_context *context,
coroutine_start start,
void *stack_pointer,
size_t stack_size
) {
context->stack_pointer = (void**)stack_pointer;
if (!start) {
assert(!context->stack_pointer);
/* We are main coroutine for this thread */
return;
}
*--context->stack_pointer = (void*)start;
/* Windows Thread Information Block */
*--context->stack_pointer = 0; /* fs:[0] */
*--context->stack_pointer = (void*)stack_pointer; /* fs:[4] */
*--context->stack_pointer = (void*)((char *)stack_pointer - stack_size); /* fs:[8] */
context->stack_pointer -= COROUTINE_REGISTERS;
memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
}
coroutine_context * __fastcall coroutine_transfer(coroutine_context * current, coroutine_context * target);
static inline void coroutine_destroy(coroutine_context * context)
{
}
#if __cplusplus
}
#endif
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