mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
#ifndef COROUTINE_UCONTEXT_CONTEXT_H
|
|
#define COROUTINE_UCONTEXT_CONTEXT_H 1
|
|
|
|
/*
|
|
* This file is part of the "Coroutine" project and released under the MIT License.
|
|
*
|
|
* Created by Samuel Williams on 24/6/2019.
|
|
* Copyright, 2019, by Samuel Williams.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <assert.h>
|
|
#include <stddef.h>
|
|
#include <ucontext.h>
|
|
|
|
#define COROUTINE __attribute__((noreturn)) void
|
|
|
|
#ifdef HAVE_STDINT_H
|
|
#include <stdint.h>
|
|
#if INTPTR_MAX <= INT32_MAX
|
|
#define COROUTINE_LIMITED_ADDRESS_SPACE
|
|
#endif
|
|
#endif
|
|
|
|
struct coroutine_context
|
|
{
|
|
ucontext_t state;
|
|
struct coroutine_context * from;
|
|
void *argument;
|
|
};
|
|
|
|
typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
|
|
|
|
COROUTINE coroutine_trampoline(void * _start, void * _context);
|
|
|
|
static inline void coroutine_initialize_main(struct coroutine_context * context) {
|
|
context->from = NULL;
|
|
getcontext(&context->state);
|
|
}
|
|
|
|
static inline void coroutine_initialize(
|
|
struct coroutine_context *context,
|
|
coroutine_start start,
|
|
void *stack,
|
|
size_t size
|
|
) {
|
|
assert(start && stack && size >= 1024);
|
|
|
|
coroutine_initialize_main(context);
|
|
|
|
context->state.uc_stack.ss_size = size;
|
|
// Despite what it's called, this is not actually a stack pointer. It points to the address of the stack allocation (the lowest address).
|
|
context->state.uc_stack.ss_sp = (char*)stack;
|
|
context->state.uc_stack.ss_flags = 0;
|
|
context->state.uc_link = NULL;
|
|
|
|
makecontext(&context->state, (void(*)(void))coroutine_trampoline, 2, (void*)start, (void*)context);
|
|
}
|
|
|
|
static inline struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target)
|
|
{
|
|
struct coroutine_context * previous = target->from;
|
|
|
|
target->from = current;
|
|
swapcontext(¤t->state, &target->state);
|
|
target->from = previous;
|
|
|
|
return target;
|
|
}
|
|
|
|
static inline void coroutine_destroy(struct coroutine_context * context)
|
|
{
|
|
context->state.uc_stack.ss_sp = NULL;
|
|
context->state.uc_stack.ss_size = 0;
|
|
context->from = NULL;
|
|
}
|
|
|
|
#endif /* COROUTINE_UCONTEXT_CONTEXT_H */
|