mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
|
//
|
||
|
|
// File file is part of the "Coroutine" project and released under the MIT License.
|
||
|
|
//
|
||
|
|
// Created by Samuel Williams on 3/11/2018.
|
||
|
|
// Copyright, 2018, by Samuel Williams. All rights reserved.
|
||
|
|
//
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include <assert.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#if __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define COROUTINE void __attribute__((fastcall))
|
||
|
|
|
||
|
|
const size_t COROUTINE_REGISTERS = 4;
|
||
|
|
|
||
|
|
// The fiber context (stack pointer).
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
void **stack_pointer;
|
||
|
|
} coroutine_context;
|
||
|
|
|
||
|
|
// The initialization function.
|
||
|
|
typedef void(* coroutine_start)(coroutine_context *from, coroutine_context *self) __attribute__((fastcall));
|
||
|
|
|
||
|
|
void coroutine_initialize(
|
||
|
|
coroutine_context *context,
|
||
|
|
coroutine_start start,
|
||
|
|
void *stack_pointer,
|
||
|
|
size_t stack_size
|
||
|
|
) {
|
||
|
|
/* Force 16-byte alignment */
|
||
|
|
context->stack_pointer = (void**)((uintptr_t)stack_pointer & ~0xF);
|
||
|
|
|
||
|
|
if (!start) {
|
||
|
|
assert(!context->stack_pointer);
|
||
|
|
/* We are main coroutine for this thread */
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
*--context->stack_pointer = NULL;
|
||
|
|
*--context->stack_pointer = (void*)start;
|
||
|
|
|
||
|
|
context->stack_pointer -= COROUTINE_REGISTERS;
|
||
|
|
memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
|
||
|
|
}
|
||
|
|
|
||
|
|
coroutine_context * coroutine_transfer(coroutine_context * current, coroutine_context * target) __attribute__((fastcall));
|
||
|
|
|
||
|
|
inline void coroutine_destroy(coroutine_context * context)
|
||
|
|
{
|
||
|
|
context->stack_pointer = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
#if __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|