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/*
* SpiceGtk coroutine with Windows fibers
*
* Copyright (C) 2011 Marc-André Lureau <marcandre.lureau@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.0 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <stdio.h>
#include <glib.h>
#include "coroutine.h"
static struct coroutine leader = { 0, };
static struct coroutine *current = NULL;
static struct coroutine *caller = NULL;
int coroutine_release(struct coroutine *co)
{
DeleteFiber(co->fiber);
return 0;
}
static void WINAPI coroutine_trampoline(LPVOID lpParameter)
{
struct coroutine *co = (struct coroutine *)lpParameter;
co->data = co->entry(co->data);
if (co->release)
co->ret = co->release(co);
else
co->ret = 0;
co->caller = NULL;
// and switch back to caller
co->ret = 1;
SwitchToFiber(caller->fiber);
}
void coroutine_init(struct coroutine *co)
{
if (leader.fiber == NULL) {
leader.fiber = ConvertThreadToFiber(&leader);
if (leader.fiber == NULL)
g_error("ConvertThreadToFiber() failed");
}
co->exited = 0;
co->fiber = CreateFiber(0, &coroutine_trampoline, co);
if (co->fiber == NULL)
g_error("CreateFiber() failed");
co->ret = 0;
}
struct coroutine *coroutine_self(void)
{
if (current == NULL)
current = &leader;
return current;
}
void *coroutine_swap(struct coroutine *from, struct coroutine *to, void *arg)
{
to->data = arg;
current = to;
caller = from;
SwitchToFiber(to->fiber);
if (to->ret == 0)
return from->data;
else if (to->ret == 1) {
coroutine_release(to);
current = &leader;
to->exited = 1;
return to->data;
}
return NULL;
}
void *coroutine_yieldto(struct coroutine *to, void *arg)
{
g_return_val_if_fail(!to->caller, NULL);
g_return_val_if_fail(!to->exited, NULL);
to->caller = coroutine_self();
return coroutine_swap(coroutine_self(), to, arg);
}
void *coroutine_yield(void *arg)
{
struct coroutine *to = coroutine_self()->caller;
if (!to) {
fprintf(stderr, "Co-routine is yielding to no one\n");
abort();
}
coroutine_self()->caller = NULL;
return coroutine_swap(coroutine_self(), to, arg);
}
gboolean coroutine_is_main(struct coroutine *co)
{
return (co == &leader);
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* tab-width: 8
* End:
*/
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