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95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
#ifndef COROUTINE_COPY_CONTEXT_H
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#define COROUTINE_COPY_CONTEXT_H 1
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/*
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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 27/6/2019.
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* Copyright, 2019, 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 <setjmp.h>
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#include <string.h>
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#include <stdlib.h>
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/* OpenBSD supports alloca, but does not include alloca.h */
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#ifndef __OpenBSD__
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#include <alloca.h>
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#endif
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#define COROUTINE __attribute__((noreturn)) void
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#if INTPTR_MAX <= INT32_MAX
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#define COROUTINE_LIMITED_ADDRESS_SPACE
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#endif
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// This stack copying implementation which uses a private stack for each coroutine, including the main one.
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#define COROUTINE_PRIVATE_STACK
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struct coroutine_context
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{
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// Private stack:
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void *stack;
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size_t size, used;
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// The top (or bottom) of the currently executing stack:
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void *base;
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jmp_buf state;
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struct coroutine_context *from;
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};
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typedef COROUTINE(*coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
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int coroutine_save_stack(struct coroutine_context * context);
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COROUTINE coroutine_restore_stack(struct coroutine_context *context);
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// @param stack The private stack area memory allocation (pointer to lowest address).
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// @param size The size of the private stack area.
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// @param base A stack pointer to the base of the main stack. On x86 hardware, this is the upper extent of the region that will be copied to the private stack.
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static inline void coroutine_initialize_main(struct coroutine_context *context, void *stack, size_t size, void *base) {
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assert(stack);
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assert(size >= 1024);
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context->stack = stack;
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context->size = size;
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context->used = 0;
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assert(base);
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context->base = base;
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context->from = NULL;
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}
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// @param start The start function to invoke.
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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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void *base
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) {
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assert(start);
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coroutine_initialize_main(context, stack, size, base);
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if (coroutine_save_stack(context)) {
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start(context->from, context);
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}
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}
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struct coroutine_context *coroutine_transfer(struct coroutine_context *current, register 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 = NULL;
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context->size = 0;
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context->from = NULL;
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}
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#endif /* COROUTINE_COPY_CONTEXT_H */
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