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/*
* 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 "block/coroutine.h"
#include "block/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);
}
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