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/*
* GTK VNC Widget
*
* Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>
*
* 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 "coroutine.h"
#include <stdio.h>
#include <stdlib.h>
static GCond *run_cond;
static GMutex *run_lock;
static struct coroutine *current;
static struct coroutine leader;
#if 0
#define CO_DEBUG(OP) fprintf(stderr, "%s %p %s %d\n", OP, g_thread_self(), __FUNCTION__, __LINE__)
#else
#define CO_DEBUG(OP)
#endif
static void coroutine_system_init(void)
{
if (!g_thread_supported()) {
CO_DEBUG("INIT");
g_thread_init(NULL);
}
run_cond = g_cond_new();
run_lock = g_mutex_new();
CO_DEBUG("LOCK");
g_mutex_lock(run_lock);
/* The thread that creates the first coroutine is the system coroutine
* so let's fill out a structure for it */
leader.entry = NULL;
leader.release = NULL;
leader.stack_size = 0;
leader.exited = 0;
leader.thread = g_thread_self();
leader.runnable = TRUE; /* we're the one running right now */
leader.caller = NULL;
leader.data = NULL;
current = &leader;
}
static gpointer coroutine_thread(gpointer opaque)
{
struct coroutine *co = opaque;
CO_DEBUG("LOCK");
g_mutex_lock(run_lock);
while (!co->runnable) {
CO_DEBUG("WAIT");
g_cond_wait(run_cond, run_lock);
}
CO_DEBUG("RUNNABLE");
current = co;
co->caller->data = co->entry(co->data);
co->exited = 1;
co->caller->runnable = TRUE;
CO_DEBUG("BROADCAST");
g_cond_broadcast(run_cond);
CO_DEBUG("UNLOCK");
g_mutex_unlock(run_lock);
return NULL;
}
void coroutine_init(struct coroutine *co)
{
GError *err = NULL;
if (run_cond == NULL)
coroutine_system_init();
CO_DEBUG("NEW");
co->thread = g_thread_create_full(coroutine_thread, co, co->stack_size,
FALSE, TRUE,
G_THREAD_PRIORITY_NORMAL,
&err);
if (err != NULL)
g_error("g_thread_create_full() failed: %s", err->message);
co->exited = 0;
co->runnable = FALSE;
co->caller = NULL;
}
int coroutine_release(struct coroutine *co G_GNUC_UNUSED)
{
return 0;
}
void *coroutine_swap(struct coroutine *from, struct coroutine *to, void *arg)
{
from->runnable = FALSE;
to->runnable = TRUE;
to->data = arg;
to->caller = from;
CO_DEBUG("BROADCAST");
g_cond_broadcast(run_cond);
CO_DEBUG("UNLOCK");
g_mutex_unlock(run_lock);
CO_DEBUG("LOCK");
g_mutex_lock(run_lock);
while (!from->runnable) {
CO_DEBUG("WAIT");
g_cond_wait(run_cond, run_lock);
}
current = from;
to->caller = NULL;
CO_DEBUG("SWAPPED");
return from->data;
}
struct coroutine *coroutine_self(void)
{
if (run_cond == NULL)
coroutine_system_init();
return current;
}
void *coroutine_yieldto(struct coroutine *to, void *arg)
{
g_return_val_if_fail(!to->caller, NULL);
g_return_val_if_fail(!to->exited, NULL);
CO_DEBUG("SWAP");
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();
}
CO_DEBUG("SWAP");
coroutine_self()->caller = NULL;
return coroutine_swap(coroutine_self(), to, arg);
}
gboolean coroutine_is_main(struct coroutine *co)
{
return (co == &leader);
}
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