Context.h

/*
 *  This file is part of the "Coroutine" project and released under the MIT License.
 *
 *  Created by Samuel Williams on 24/6/2021.
 *  Copyright, 2021, by Samuel Williams.
*/
 
#pragma once
 
#include <assert.h>
#include <stddef.h>
#include <pthread.h>
 
#define COROUTINE void
 
#define COROUTINE_PTHREAD_CONTEXT
 
#ifdef HAVE_STDINT_H
#include <stdint.h>
#if INTPTR_MAX <= INT32_MAX
#define COROUTINE_LIMITED_ADDRESS_SPACE
#endif
#endif
 
struct coroutine_context;
 
struct coroutine_shared
{
    pthread_mutex_t guard;
    struct coroutine_context * main;
 
    size_t count;
};
 
typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
 
struct coroutine_context
{
    struct coroutine_shared * shared;
 
    coroutine_start start;
    void *argument;
 
    void *stack;
    size_t size;
 
    pthread_t id;
    pthread_cond_t schedule;
    struct coroutine_context * from;
};
 
void coroutine_initialize_main(struct coroutine_context * context);
 
void coroutine_initialize(
    struct coroutine_context *context,
    coroutine_start start,
    void *stack,
    size_t size
);
 
struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
 
void coroutine_destroy(struct coroutine_context * context);