mirror of https://gitee.com/openkylin/qemu.git
76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
/*
|
|
* QEMU coroutines
|
|
*
|
|
* Copyright IBM, Corp. 2011
|
|
*
|
|
* Authors:
|
|
* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
|
|
* Kevin Wolf <kwolf@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU LGPL, version 2 or later.
|
|
* See the COPYING.LIB file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "trace.h"
|
|
#include "qemu-common.h"
|
|
#include "qemu-coroutine.h"
|
|
#include "qemu-coroutine-int.h"
|
|
|
|
Coroutine *qemu_coroutine_create(CoroutineEntry *entry)
|
|
{
|
|
Coroutine *co = qemu_coroutine_new();
|
|
co->entry = entry;
|
|
return co;
|
|
}
|
|
|
|
static void coroutine_swap(Coroutine *from, Coroutine *to)
|
|
{
|
|
CoroutineAction ret;
|
|
|
|
ret = qemu_coroutine_switch(from, to, COROUTINE_YIELD);
|
|
|
|
switch (ret) {
|
|
case COROUTINE_YIELD:
|
|
return;
|
|
case COROUTINE_TERMINATE:
|
|
trace_qemu_coroutine_terminate(to);
|
|
qemu_coroutine_delete(to);
|
|
return;
|
|
default:
|
|
abort();
|
|
}
|
|
}
|
|
|
|
void qemu_coroutine_enter(Coroutine *co, void *opaque)
|
|
{
|
|
Coroutine *self = qemu_coroutine_self();
|
|
|
|
trace_qemu_coroutine_enter(self, co, opaque);
|
|
|
|
if (co->caller) {
|
|
fprintf(stderr, "Co-routine re-entered recursively\n");
|
|
abort();
|
|
}
|
|
|
|
co->caller = self;
|
|
co->entry_arg = opaque;
|
|
coroutine_swap(self, co);
|
|
}
|
|
|
|
void coroutine_fn qemu_coroutine_yield(void)
|
|
{
|
|
Coroutine *self = qemu_coroutine_self();
|
|
Coroutine *to = self->caller;
|
|
|
|
trace_qemu_coroutine_yield(self, to);
|
|
|
|
if (!to) {
|
|
fprintf(stderr, "Co-routine is yielding to no one\n");
|
|
abort();
|
|
}
|
|
|
|
self->caller = NULL;
|
|
coroutine_swap(self, to);
|
|
}
|