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78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
#ifndef COROUTINE_UCONTEXT_CONTEXT_H
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#define COROUTINE_UCONTEXT_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 24/6/2019.
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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 <ucontext.h>
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#define COROUTINE __attribute__((noreturn)) void
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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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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#endif
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struct coroutine_context
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{
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ucontext_t 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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COROUTINE coroutine_trampoline(void * _start, void * _context);
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static inline void coroutine_initialize_main(struct coroutine_context * context) {
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context->from = NULL;
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getcontext(&context->state);
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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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coroutine_initialize_main(context);
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context->state.uc_stack.ss_size = size;
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// Despite what it's called, this is not actually a stack pointer. It points to the address of the stack allocation (the lowest address).
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context->state.uc_stack.ss_sp = (char*)stack;
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context->state.uc_stack.ss_flags = 0;
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context->state.uc_link = NULL;
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makecontext(&context->state, (void(*)(void))coroutine_trampoline, 2, (void*)start, (void*)context);
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}
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static inline struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target)
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{
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struct coroutine_context * previous = target->from;
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target->from = current;
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swapcontext(¤t->state, &target->state);
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target->from = previous;
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return target;
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}
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static inline void coroutine_destroy(struct coroutine_context * context)
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{
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context->state.uc_stack.ss_sp = NULL;
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context->state.uc_stack.ss_size = 0;
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context->from = NULL;
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}
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#endif /* COROUTINE_UCONTEXT_CONTEXT_H */
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