/*
 * Copyright (c) 2001, Swedish Institute of Computer Science.
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 *
 * This file is part of the lwIP TCP/IP stack.
 * 
 * Author:     Adam Dunkels      <adam@sics.se>
 * Sub Author: Christopher Olsen <colsen@domaintlantic.com>
 *
 * Notes:
 *  Modified to work with the ubix operating system
 *
 * $Log$
 * Revision 1.6  2004/09/11 21:30:37  apwillia
 * Fix race conditions in net thread and scheduler
 *
 * Revision 1.5  2004/09/07 20:58:35  reddawg
 * time to roll back i can't think straight by friday
 *
 * Revision 1.4  2004/05/25 22:49:29  reddawg
 * Stupid Old CODE!!!
 *
 * Revision 1.3  2004/05/19 04:07:43  reddawg
 * kmalloc(size,pid) no more it is no kmalloc(size); the way it should of been
 *
 * Revision 1.2  2004/05/19 03:35:02  reddawg
 * Fixed A Few Ordering Issues In The Service Startup Routine
 *
 * Revision 1.1.1.1  2004/04/15 12:07:14  reddawg
 * UbixOS v1.0
 *
 * Revision 1.13  2004/04/13 21:29:53  reddawg
 * We now have sockets working. Lots of functionality to be added to continually
 * improve on the existing layers now its clean up time to get things in a better
 * working order.
 *
 * Revision 1.12  2004/04/13 16:08:07  reddawg
 * Removed all of the old debug code the problem seems to be in ubthreads with
 * ubthread_mutex_init
 *
 * Revision 1.11  2004/04/13 16:05:40  reddawg
 * Function Renaming
 *
 *
 *
 * $Id$
 */

#include <ubixos/types.h>
#include <ubixos/sched.h>
#include <ubixos/ubthread.h>
#include <ubixos/kpanic.h>
#include <lib/kprintf.h>
#include <lib/kmalloc.h>

#include "net/debug.h"
#include "net/sys.h"
#include "net/opt.h"
#include "net/stats.h"

#include <ubixos/spinlock.h>

#define UMAX(a, b)      ((a) > (b) ? (a) : (b))

static struct sys_thread *threads = 0x0;
static spinLock_t netThreadSpinlock;


struct sys_mbox_msg {
  struct sys_mbox_msg *next;
  void *msg;
};

#define SYS_MBOX_SIZE 100

struct sys_mbox {
  uInt16 first, last;
  void *msgs[SYS_MBOX_SIZE];
  struct sys_sem *mail;
  struct sys_sem *mutex;
};

struct sys_sem {
  unsigned int c;
  ubthread_cond_t cond;
  ubthread_mutex_t mutex;
};

struct sys_thread {
  struct sys_thread *next;
  struct sys_timeouts timeouts;
  kTask_t *ubthread;
};


static struct timeval starttime;

static struct sys_sem *sys_sem_new_(uInt8 count);
static void sys_sem_free_(struct sys_sem *sem);

static uInt16 cond_wait(ubthread_cond_t *cond, ubthread_mutex_t *mutex, uInt16 timeout);

static struct sys_thread *current_thread(void) {
  struct sys_thread *st;
  kTask_t *pt;
  pt = ubthread_self();
  spinLock(&netThreadSpinlock);
  for(st = threads; st != NULL; st = st->next) {
    if(st->ubthread == pt) {
      spinUnlock(&netThreadSpinlock);
      return st;
    }
  }
  spinUnlock(&netThreadSpinlock);
  kprintf("sys: current_thread: could not find current thread!\n");
  kprintf("This is due to a race condition in the LinuxThreads\n");
  kprintf("ubthreads implementation. Start the program again.\n");
  
  kpanic("ABORT");
  return(0x0);
  }


struct thread_start_param {
  struct sys_thread *thread;
  void (* function)(void *);
  void *arg;
  };

/*
static void *thread_start(void *arg) {
  struct thread_start_param *tp = arg;
  tp->thread->ubthread = ubthread_self();
  tp->function(tp->arg);
  kfree(tp);
  return(NULL);
  }
*/

void sys_thread_new(void (* function)(void), void *arg) {
  struct sys_thread *thread = 0x0;
  //struct thread_start_param *thread_param;
  kprintf("sys_thread: [0x%X]\n",sizeof(struct sys_thread));
  
  thread = kmalloc(sizeof(struct sys_thread));
  kprintf("THREAD: [0x%X]\n",thread);
  spinLock(&netThreadSpinlock);
  thread->next = threads;
  thread->timeouts.next = NULL;
  thread->ubthread = 0x0;
  threads = thread;
  spinUnlock(&netThreadSpinlock);
  

  /*
  thread_param = kmalloc(sizeof(struct thread_start_param));
  
  thread_param->function = function;
  thread_param->arg = arg;
  thread_param->thread = thread;
  */
  //execThread((void *)function,0x0,0x0);
 
  kprintf("thread->ubthread: [0x%X]\n",thread->ubthread);
  if(ubthread_create(&thread->ubthread, 0x0,(void *)(function), arg) != 0x0) {
    kpanic("sys_thread_new: ubthread_create");
    }
  kprintf("thread->ubthread: [0x%X]\n",thread->ubthread); 
  
  }

struct sys_mbox *sys_mbox_new() {
  struct sys_mbox *mbox;

  mbox = kmalloc(sizeof(struct sys_mbox));
  mbox->first = mbox->last = 0;
  mbox->mail = sys_sem_new_(0);
  mbox->mutex = sys_sem_new_(1);
  
  return(mbox);
  }

void sys_mbox_free(struct sys_mbox *mbox) {
  if (mbox != SYS_MBOX_NULL) {
    sys_sem_wait(mbox->mutex);
    
    sys_sem_free_(mbox->mail);
    sys_sem_free_(mbox->mutex);
    mbox->mail = mbox->mutex = NULL;
    //kprintf("sys_mbox_free: mbox 0x%lx\n", mbox);
    kfree(mbox);
    }
  }

void sys_mbox_post(struct sys_mbox *mbox, void *msg) {
  uInt8 first;
  
  sys_sem_wait(mbox->mutex);
  
  //kprintf("sys_mbox_post: mbox %p msg %p\n", mbox, msg);

  mbox->msgs[mbox->last] = msg;

  if (mbox->last == mbox->first) {
    first = 1;
    }
  else {
    first = 0;
    }
  
  mbox->last++;
  if(mbox->last == SYS_MBOX_SIZE) {
    mbox->last = 0;
    }

  if(first) {
    sys_sem_signal(mbox->mail);
    }
  sys_sem_signal(mbox->mutex);
  }

uInt16 sys_arch_mbox_fetch(struct sys_mbox *mbox, void **msg, uInt16 timeout) {
  uInt16 time = 1;
  
  /* The mutex lock is quick so we don't bother with the timeout
     stuff here. */
  sys_arch_sem_wait(mbox->mutex, 0);
  
  while(mbox->first == mbox->last) {
    sys_sem_signal(mbox->mutex);
    
    /* We block while waiting for a mail to arrive in the mailbox. We
       must be prepared to timeout. */
    if(timeout != 0) {
      time = sys_arch_sem_wait(mbox->mail, timeout);
      
      /* If time == 0, the sem_wait timed out, and we return 0. */
      if(time == 0) {
	return 0;
      }
    } else {
      sys_arch_sem_wait(mbox->mail, 0);
    }
    
    sys_arch_sem_wait(mbox->mutex, 0);
  }
  
  if(msg != NULL) {
    //kprintf("sys_mbox_fetch: mbox %p msg %p\n", mbox, *msg);
    *msg = mbox->msgs[mbox->first];
  }
  
  mbox->first++;
  if(mbox->first == SYS_MBOX_SIZE) {
    mbox->first = 0;
  }    
  
  sys_sem_signal(mbox->mutex);
  
  return(time);
  }

struct sys_sem *sys_sem_new(uInt8 count) {
  return sys_sem_new_(count);
  }

static struct sys_sem *sys_sem_new_(uInt8 count) {
  struct sys_sem *sem;
  
  sem = kmalloc(sizeof(struct sys_sem));
  sem->c = count;
  
  ubthread_cond_init(&(sem->cond), NULL);
  ubthread_mutex_init(&(sem->mutex), NULL);
  
  return sem;
  }

static uInt16 cond_wait(ubthread_cond_t *cond, ubthread_mutex_t *mutex, uInt16 timeout) {
  unsigned int tdiff;
  unsigned long sec, usec;
  struct timeval rtime1, rtime2;
  struct timespec ts;
  struct timezone tz;
  int retval;

  if (timeout > 0) {
    /* Get a timestamp and add the timeout value. */
    gettimeofday(&rtime1, &tz);
    sec = rtime1.tv_sec;
    usec = rtime1.tv_usec;
    usec += timeout % 1000 * 1000;  
    sec += (int)(timeout / 1000) + (int)(usec / 1000000);
    usec = usec % 1000000;
    ts.tv_nsec = usec * 1000;
    ts.tv_sec = sec;
    
    retval = ubthread_cond_timedwait(cond, mutex, &ts);
    if (retval == ETIMEDOUT) {
      return 0;
      }
    else {
      /* Calculate for how long we waited for the cond. */
      gettimeofday(&rtime2, &tz);
      tdiff = (rtime2.tv_sec - rtime1.tv_sec) * 1000 +	
	(rtime2.tv_usec - rtime1.tv_usec) / 1000;
      if (tdiff == 0) {
	return 1;
        }
      return tdiff;
      }
    }
  else {
    ubthread_cond_wait(cond, mutex);
    return 0;
    }
  }

uInt16 sys_arch_sem_wait(struct sys_sem *sem, uInt16 timeout) {
  uInt16 time = 1;
  ubthread_mutex_lock(&(sem->mutex));
  while(sem->c <= 0) {
    if(timeout > 0) {
      time = cond_wait(&(sem->cond), &(sem->mutex), timeout);
      if(time == 0) {
	ubthread_mutex_unlock(&(sem->mutex));
	return 0;
      }
    } else {
      cond_wait(&(sem->cond), &(sem->mutex), 0);
    }
  }
  sem->c--;
  ubthread_mutex_unlock(&(sem->mutex));
  return(time);
  }

void sys_sem_signal(struct sys_sem *sem) {
  ubthread_mutex_lock(&(sem->mutex));
  sem->c++;
  if(sem->c > 1)
    sem->c = 1;
  ubthread_cond_signal(&(sem->cond));
  ubthread_mutex_unlock(&(sem->mutex));
  }

void sys_sem_free(struct sys_sem *sem) {
  if(sem != SYS_SEM_NULL) {
    sys_sem_free_(sem);
    } 
  }

static void sys_sem_free_(struct sys_sem *sem) {
  ubthread_cond_destroy(&(sem->cond));
  ubthread_mutex_destroy(&(sem->mutex));
  kfree(sem);
  }

unsigned long sys_unix_now() {
  struct timeval tv;
  struct timezone tz;
  long sec, usec;
  unsigned long msec;
  gettimeofday(&tv, &tz);

  sec = tv.tv_sec - starttime.tv_sec;
  usec = tv.tv_usec - starttime.tv_usec;
  msec = sec * 1000 + usec / 1000;
  return msec;
  }

void sys_init() {
  struct timezone tz;
  gettimeofday(&starttime, &tz);
  }

struct sys_timeouts *sys_arch_timeouts(void) {
  struct sys_thread *thread;
  thread = current_thread();
  return(&thread->timeouts);
  }

/***
 END
 ***/