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/*
* Coroutine internals
*
* Copyright (c) 2011 Kevin Wolf <kwolf@redhat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef QEMU_COROUTINE_INT_H
#define QEMU_COROUTINE_INT_H
#include "qemu/queue.h"
#include "qemu/coroutine.h"
#ifdef CONFIG_SAFESTACK
/* Pointer to the unsafe stack, defined by the compiler */
extern __thread void *__safestack_unsafe_stack_ptr;
#endif
#define COROUTINE_STACK_SIZE (1 << 20)
typedef enum {
COROUTINE_YIELD = 1,
COROUTINE_TERMINATE = 2,
COROUTINE_ENTER = 3,
} CoroutineAction;
struct Coroutine {
CoroutineEntry *entry;
void *entry_arg;
Coroutine *caller;
/* Only used when the coroutine has terminated. */
QSLIST_ENTRY(Coroutine) pool_next;
size_t locks_held;
/* Only used when the coroutine has yielded. */
AioContext *ctx;
/* Used to catch and abort on illegal co-routine entry.
* Will contain the name of the function that had first
* scheduled the coroutine. */
const char *scheduled;
QSIMPLEQ_ENTRY(Coroutine) co_queue_next;
/* Coroutines that should be woken up when we yield or terminate.
* Only used when the coroutine is running.
*/
QSIMPLEQ_HEAD(, Coroutine) co_queue_wakeup;
QSLIST_ENTRY(Coroutine) co_scheduled_next;
};
Coroutine *qemu_coroutine_new(void);
void qemu_coroutine_delete(Coroutine *co);
CoroutineAction qemu_coroutine_switch(Coroutine *from, Coroutine *to,
CoroutineAction action);
#endif
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