зеркало из https://github.com/github/ruby.git
55 строки
1.4 KiB
C
55 строки
1.4 KiB
C
/*
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* This file is part of the "Coroutine" project and released under the MIT License.
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*
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* Created by Samuel Williams on 10/5/2018.
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* Copyright, 2018, by Samuel Williams.
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*/
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#pragma once
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#include <assert.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#define COROUTINE __attribute__((noreturn)) void
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enum {COROUTINE_REGISTERS = 6};
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struct coroutine_context
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{
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void **stack_pointer;
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};
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typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
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static inline void coroutine_initialize_main(struct coroutine_context * context) {
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context->stack_pointer = NULL;
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}
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static inline void coroutine_initialize(
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struct coroutine_context *context,
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coroutine_start start,
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void *stack,
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size_t size
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) {
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assert(start && stack && size >= 1024);
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// Stack grows down. Force 16-byte alignment.
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char * top = (char*)stack + size;
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context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
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*--context->stack_pointer = NULL;
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*--context->stack_pointer = (void*)start;
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context->stack_pointer -= COROUTINE_REGISTERS;
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memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
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}
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struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
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static inline void coroutine_destroy(struct coroutine_context * context)
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{
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context->stack_pointer = NULL;
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}
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