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99346f74a4
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65853 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
59 lines
1.5 KiB
C
59 lines
1.5 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 3/11/2018.
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* Copyright, 2018, by Samuel Williams. All rights reserved.
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*/
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#pragma once
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#include <assert.h>
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#include <string.h>
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#if __cplusplus
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extern "C" {
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#endif
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#define COROUTINE __attribute__((noreturn, fastcall)) void
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const size_t COROUTINE_REGISTERS = 4;
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typedef struct
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{
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void **stack_pointer;
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} coroutine_context;
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typedef void(* coroutine_start)(coroutine_context *from, coroutine_context *self) __attribute__((fastcall));
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void coroutine_initialize(
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coroutine_context *context,
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coroutine_start start,
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void *stack_pointer,
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size_t stack_size
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) {
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/* Force 16-byte alignment */
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context->stack_pointer = (void**)((uintptr_t)stack_pointer & ~0xF);
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if (!start) {
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assert(!context->stack_pointer);
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/* We are main coroutine for this thread */
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return;
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}
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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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coroutine_context * coroutine_transfer(coroutine_context * current, coroutine_context * target) __attribute__((fastcall));
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inline void coroutine_destroy(coroutine_context * context)
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{
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context->stack_pointer = NULL;
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}
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#if __cplusplus
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}
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#endif
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