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/*
Copyright (C) 2009 Free Software Foundation, Inc.
Written by Zheng Da.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
The GNU Hurd 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <string.h>
#include "util.h"
#include "mach_proxy.h"
static LIST_HEADER (tasks_head);
static struct mutex tasks_lock = MUTEX_INITIALIZER;
int create_pseudo_task (task_t real_task, task_t *ret_pseudo_task)
{
/* the first task is the kernel task. */
struct task_info *task_pi;
task_t pseudo_task;
error_t err;
err = ports_create_port (task_portclass, port_bucket,
sizeof (struct task_info), &task_pi);
if (err)
return err;
task_pi->task_port = real_task;
task_pi->exc_pi = NULL;
task_pi->user_exc_port = 0;
mutex_info (&task_pi->lock);
entry_init (&task_pi->list);
mutex_lock (&tasks_lock);
add_entry_end (&tasks_head, &task_pi->list);
mutex_unlock (&tasks_lock);
pseudo_task = ports_get_right (task_pi);
mach_port_insert_right (mach_task_self (), pseudo_task, pseudo_task,
MACH_MSG_TYPE_MAKE_SEND);
ports_port_deref (task_pi);
if (ret_pseudo_task)
*ret_pseudo_task = pseudo_task;
err = task_set_kernel_port (real_task, pseudo_task);
if (err)
{
debug ("fail to set the kernel port: %s", strerror (err));
ports_destroy_right (task_pi);
}
return err;
}
void clean_pseudo_task (void *pi)
{
struct task_info *task = pi;
debug ("remove a pseudo task from the list");
mutex_lock (&tasks_lock);
remove_entry (&task->list);
mutex_unlock (&tasks_lock);
if (task->exc_pi)
ports_destroy_right (task->exc_pi);
if (task->user_exc_port)
mach_port_deallocate (mach_task_self (), task->user_exc_port);
}
void foreach_task (task_callback_t callback)
{
struct list *entry = &tasks_head;
mutex_lock (&tasks_lock);
for (entry = tasks_head.next; entry != &tasks_head; entry = entry->next)
{
// mutex_unlock (&tasks_lock);
struct task_info *task_pi = LIST_ENTRY (entry, struct task_info, list);
if (callback (task_pi))
break;
// mutex_lock (&tasks_lock);
}
mutex_unlock (&tasks_lock);
}
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