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# sys_arch.c

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    00001 /*
    00002  * Copyright (c) 2001, Swedish Institute of Computer Science.
    00003  * All rights reserved.
    00004  *
    00005  * Redistribution and use in source and binary forms, with or without
    00006  * modification, are permitted provided that the following conditions
    00007  * are met:
    00008  * 1. Redistributions of source code must retain the above copyright
    00009  *    notice, this list of conditions and the following disclaimer.
    00010  * 2. Redistributions in binary form must reproduce the above copyright
    00011  *    notice, this list of conditions and the following disclaimer in the
    00012  *    documentation and/or other materials provided with the distribution.
    00013  * 3. Neither the name of the Institute nor the names of its contributors
    00014  *    may be used to endorse or promote products derived from this software
    00015  *    without specific prior written permission.
    00016  *
    00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
    00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
    00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    00027  * SUCH DAMAGE.
    00028  *
    00029  * This file is part of the lwIP TCP/IP stack.
    00030  *
    00031  * Author:     Adam Dunkels      <adam@sics.se>
    00032  * Sub Author: Christopher Olsen <colsen@domaintlantic.com>
    00033  *
    00034  * Notes:
    00035  *  Modified to work with the ubix operating system
    00036  *
    00037  * $Log: sys__arch_8c-source.html,v $
    00037  * Revision 1.5  2006/12/12 14:09:08  reddawg
    00037  * Changes
    00037  *
    00038  * Revision 1.1.1.1  2006/06/01 12:46:16  reddawg
    00039  * ubix2
    00040  *
    00041  * Revision 1.2  2005/10/12 00:13:37  reddawg
    00042  * Removed
    00043  *
    00044  * Revision 1.1.1.1  2005/09/26 17:24:31  reddawg
    00045  * no message
    00046  *
    00047  * Revision 1.6  2004/09/11 21:30:37  apwillia
    00048  * Fix race conditions in net thread and scheduler
    00049  *
    00050  * Revision 1.5  2004/09/07 20:58:35  reddawg
    00051  * time to roll back i can't think straight by friday
    00052  *
    00053  * Revision 1.4  2004/05/25 22:49:29  reddawg
    00054  * Stupid Old CODE!!!
    00055  *
    00056  * Revision 1.3  2004/05/19 04:07:43  reddawg
    00057  * kmalloc(size,pid) no more it is no kmalloc(size); the way it should of been
    00058  *
    00059  * Revision 1.2  2004/05/19 03:35:02  reddawg
    00060  * Fixed A Few Ordering Issues In The Service Startup Routine
    00061  *
    00062  * Revision 1.1.1.1  2004/04/15 12:07:14  reddawg
    00063  * UbixOS v1.0
    00064  *
    00065  * Revision 1.13  2004/04/13 21:29:53  reddawg
    00066  * We now have sockets working. Lots of functionality to be added to continually
    00067  * improve on the existing layers now its clean up time to get things in a better
    00068  * working order.
    00069  *
    00070  * Revision 1.12  2004/04/13 16:08:07  reddawg
    00071  * Removed all of the old debug code the problem seems to be in ubthreads with
    00072  * ubthread_mutex_init
    00073  *
    00074  * Revision 1.11  2004/04/13 16:05:40  reddawg
    00075  * Function Renaming
    00076  *
    00077  *
    00078  *
    00079  * $Id: sys__arch_8c-source.html 88 2016-01-12 00:11:29Z reddawg $
    00080  */
    00081
    00082 #include <ubixos/types.h>
    00083 #include <ubixos/sched.h>
    00084 #include <ubixos/ubthread.h>
    00085 #include <ubixos/kpanic.h>
    00086 #include <lib/kprintf.h>
    00087 #include <lib/kmalloc.h>
    00088
    00089 #include "net/debug.h"
    00090 #include "net/sys.h"
    00091 #include "net/opt.h"
    00092 #include "net/stats.h"
    00093
    00094 #include <ubixos/spinlock.h>
    00095
    00096 #define UMAX(a, b)      ((a) > (b) ? (a) : (b))
    00097
    00098 static struct sys_thread *threads = 0x0;
    00099 static spinLock_t netThreadSpinlock = SPIN_LOCK_INITIALIZER;
    00100
    00101 struct sys_mbox_msg {
    00102   struct sys_mbox_msg *next;
    00103   void *msg;
    00104 };
    00105
    00106 #define SYS_MBOX_SIZE 100
    00107
    00108 struct sys_mbox {
    00109   uInt16 first, last;
    00110   void *msgs[SYS_MBOX_SIZE];
    00111   struct sys_sem *mail;
    00112   struct sys_sem *mutex;
    00113 };
    00114
    00115 struct sys_sem {
    00116   unsigned int c;
    00117   ubthread_cond_t cond;
    00118   ubthread_mutex_t mutex;
    00119 };
    00120
    00121 struct sys_thread {
    00122   struct sys_thread *next;
    00123   struct sys_timeouts timeouts;
    00124   kTask_t *ubthread;
    00125 };
    00126
    00127
    00128 static struct timeval starttime;
    00129
    00130 static struct sys_sem *sys_sem_new_(uInt8 count);
    00131 static void sys_sem_free_(struct sys_sem *sem);
    00132
    00133 static uInt16 cond_wait(ubthread_cond_t *cond, ubthread_mutex_t *mutex, uInt16 timeout);
    00134
    00135 static struct sys_thread *current_thread(void) {
    00136   struct sys_thread *st;
    00137   kTask_t *pt;
    00138   pt = ubthread_self();
    00139   spinLock(&netThreadSpinlock);
    00140   for(st = threads; st != NULL; st = st->next) {
    00141     if(st->ubthread == pt) {
    00142       spinUnlock(&netThreadSpinlock);
    00143       return st;
    00144     }
    00145   }
    00146   spinUnlock(&netThreadSpinlock);
    00147   kprintf("sys: current_thread: could not find current thread!\n");
    00148   kprintf("This is due to a race condition in the LinuxThreads\n");
    00149   kprintf("ubthreads implementation. Start the program again.\n");
    00150
    00151   kpanic("ABORT");
    00152   return(0x0);
    00153   }
    00154
    00155
    00156 struct thread_start_param {
    00157   struct sys_thread *thread;
    00158   void (* function)(void *);
    00159   void *arg;
    00160   };
    00161
    00162 /*
    00163 static void *thread_start(void *arg) {
    00164   struct thread_start_param *tp = arg;
    00165   tp->thread->ubthread = ubthread_self();
    00166   tp->function(tp->arg);
    00167   kfree(tp);
    00168   return(NULL);
    00169   }
    00170 */
    00171
    00172 void sys_thread_new(void (* function)(void), void *arg) {
    00173   struct sys_thread *thread = 0x0;
    00174   //struct thread_start_param *thread_param;
    00175   kprintf("sys_thread: [0x%X]\n",sizeof(struct sys_thread));
    00176
    00177   thread = kmalloc(sizeof(struct sys_thread));
    00178   kprintf("THREAD: [0x%X]\n",thread);
    00179   spinLock(&netThreadSpinlock);
    00180   thread->next = threads;
    00181   thread->timeouts.next = NULL;
    00182   thread->ubthread = 0x0;
    00183   threads = thread;
    00184   spinUnlock(&netThreadSpinlock);
    00185
    00186
    00187   /*
    00188   thread_param = kmalloc(sizeof(struct thread_start_param));
    00189
    00190   thread_param->function = function;
    00191   thread_param->arg = arg;
    00192   thread_param->thread = thread;
    00193   */
    00194   //execThread((void *)function,0x0,0x0);
    00195
    00196   kprintf("thread->ubthread: [0x%X]\n",thread->ubthread);
    00197   if(ubthread_create(&thread->ubthread, 0x0,(void *)(function), arg) != 0x0) {
    00198     kpanic("sys_thread_new: ubthread_create");
    00199     }
    00200   kprintf("thread->ubthread: [0x%X]\n",thread->ubthread);
    00201
    00202   }
    00203
    00204 struct sys_mbox *sys_mbox_new() {
    00205   struct sys_mbox *mbox;
    00206
    00207   mbox = kmalloc(sizeof(struct sys_mbox));
    00208   mbox->first = mbox->last = 0;
    00209   mbox->mail = sys_sem_new_(0);
    00210   mbox->mutex = sys_sem_new_(1);
    00211
    00212   return(mbox);
    00213   }
    00214
    00215 void sys_mbox_free(struct sys_mbox *mbox) {
    00216   if (mbox != SYS_MBOX_NULL) {
    00217     sys_sem_wait(mbox->mutex);
    00218
    00219     sys_sem_free_(mbox->mail);
    00220     sys_sem_free_(mbox->mutex);
    00221     mbox->mail = mbox->mutex = NULL;
    00222     //kprintf("sys_mbox_free: mbox 0x%lx\n", mbox);
    00223     kfree(mbox);
    00224     }
    00225   }
    00226
    00227 void sys_mbox_post(struct sys_mbox *mbox, void *msg) {
    00228   uInt8 first;
    00229
    00230   sys_sem_wait(mbox->mutex);
    00231
    00232   //kprintf("sys_mbox_post: mbox %p msg %p\n", mbox, msg);
    00233
    00234   mbox->msgs[mbox->last] = msg;
    00235
    00236   if (mbox->last == mbox->first) {
    00237     first = 1;
    00238     }
    00239   else {
    00240     first = 0;
    00241     }
    00242
    00243   mbox->last++;
    00244   if(mbox->last == SYS_MBOX_SIZE) {
    00245     mbox->last = 0;
    00246     }
    00247
    00248   if(first) {
    00249     sys_sem_signal(mbox->mail);
    00250     }
    00251   sys_sem_signal(mbox->mutex);
    00252   }
    00253
    00254 uInt16 sys_arch_mbox_fetch(struct sys_mbox *mbox, void **msg, uInt16 timeout) {
    00255   uInt16 time = 1;
    00256
    00257   /* The mutex lock is quick so we don't bother with the timeout
    00258      stuff here. */
    00259   sys_arch_sem_wait(mbox->mutex, 0);
    00260
    00261   while(mbox->first == mbox->last) {
    00262     sys_sem_signal(mbox->mutex);
    00263
    00264     /* We block while waiting for a mail to arrive in the mailbox. We
    00265        must be prepared to timeout. */
    00266     if(timeout != 0) {
    00267       time = sys_arch_sem_wait(mbox->mail, timeout);
    00268
    00269       /* If time == 0, the sem_wait timed out, and we return 0. */
    00270       if(time == 0) {
    00271         return 0;
    00272       }
    00273     } else {
    00274       sys_arch_sem_wait(mbox->mail, 0);
    00275     }
    00276
    00277     sys_arch_sem_wait(mbox->mutex, 0);
    00278   }
    00279
    00280   if(msg != NULL) {
    00281     //kprintf("sys_mbox_fetch: mbox %p msg %p\n", mbox, *msg);
    00282     *msg = mbox->msgs[mbox->first];
    00283   }
    00284
    00285   mbox->first++;
    00286   if(mbox->first == SYS_MBOX_SIZE) {
    00287     mbox->first = 0;
    00288   }
    00289
    00290   sys_sem_signal(mbox->mutex);
    00291
    00292   return(time);
    00293   }
    00294
    00295 struct sys_sem *sys_sem_new(uInt8 count) {
    00296   return sys_sem_new_(count);
    00297   }
    00298
    00299 static struct sys_sem *sys_sem_new_(uInt8 count) {
    00300   struct sys_sem *sem;
    00301
    00302   sem = kmalloc(sizeof(struct sys_sem));
    00303   sem->c = count;
    00304
    00305   ubthread_cond_init(&(sem->cond), NULL);
    00306   ubthread_mutex_init(&(sem->mutex), NULL);
    00307
    00308   return sem;
    00309   }
    00310
    00311 static uInt16 cond_wait(ubthread_cond_t *cond, ubthread_mutex_t *mutex, uInt16 timeout) {
    00312   unsigned int tdiff;
    00313   unsigned long sec, usec;
    00314   struct timeval rtime1, rtime2;
    00315   struct timespec ts;
    00316   struct timezone tz;
    00317   int retval;
    00318
    00319   if (timeout > 0) {
    00320     /* Get a timestamp and add the timeout value. */
    00321     gettimeofday(&rtime1, &tz);
    00322     sec = rtime1.tv_sec;
    00323     usec = rtime1.tv_usec;
    00324     usec += timeout % 1000 * 1000;
    00325     sec += (int)(timeout / 1000) + (int)(usec / 1000000);
    00326     usec = usec % 1000000;
    00327     ts.tv_nsec = usec * 1000;
    00328     ts.tv_sec = sec;
    00329
    00330     retval = ubthread_cond_timedwait(cond, mutex, &ts);
    00331     if (retval == ETIMEDOUT) {
    00332       return 0;
    00333       }
    00334     else {
    00335       /* Calculate for how long we waited for the cond. */
    00336       gettimeofday(&rtime2, &tz);
    00337       tdiff = (rtime2.tv_sec - rtime1.tv_sec) * 1000 +
    00338         (rtime2.tv_usec - rtime1.tv_usec) / 1000;
    00339       if (tdiff == 0) {
    00340         return 1;
    00341         }
    00342       return tdiff;
    00343       }
    00344     }
    00345   else {
    00346     ubthread_cond_wait(cond, mutex);
    00347     return 0;
    00348     }
    00349   }
    00350
    00351 uInt16 sys_arch_sem_wait(struct sys_sem *sem, uInt16 timeout) {
    00352   uInt16 time = 1;
    00353   ubthread_mutex_lock(&(sem->mutex));
    00354   while(sem->c <= 0) {
    00355     if(timeout > 0) {
    00356       time = cond_wait(&(sem->cond), &(sem->mutex), timeout);
    00357       if(time == 0) {
    00358         ubthread_mutex_unlock(&(sem->mutex));
    00359         return 0;
    00360       }
    00361     } else {
    00362       cond_wait(&(sem->cond), &(sem->mutex), 0);
    00363     }
    00364   }
    00365   sem->c--;
    00366   ubthread_mutex_unlock(&(sem->mutex));
    00367   return(time);
    00368   }
    00369
    00370 void sys_sem_signal(struct sys_sem *sem) {
    00371   ubthread_mutex_lock(&(sem->mutex));
    00372   sem->c++;
    00373   if(sem->c > 1)
    00374     sem->c = 1;
    00375   ubthread_cond_signal(&(sem->cond));
    00376   ubthread_mutex_unlock(&(sem->mutex));
    00377   }
    00378
    00379 void sys_sem_free(struct sys_sem *sem) {
    00380   if(sem != SYS_SEM_NULL) {
    00381     sys_sem_free_(sem);
    00382     }
    00383   }
    00384
    00385 static void sys_sem_free_(struct sys_sem *sem) {
    00386   ubthread_cond_destroy(&(sem->cond));
    00387   ubthread_mutex_destroy(&(sem->mutex));
    00388   kfree(sem);
    00389   }
    00390
    00391 unsigned long sys_unix_now() {
    00392   struct timeval tv;
    00393   struct timezone tz;
    00394   long sec, usec;
    00395   unsigned long msec;
    00396   gettimeofday(&tv, &tz);
    00397
    00398   sec = tv.tv_sec - starttime.tv_sec;
    00399   usec = tv.tv_usec - starttime.tv_usec;
    00400   msec = sec * 1000 + usec / 1000;
    00401   return msec;
    00402   }
    00403
    00404 void sys_init() {
    00405   struct timezone tz;
    00406   gettimeofday(&starttime, &tz);
    00407   }
    00408
    00409 struct sys_timeouts *sys_arch_timeouts(void) {
    00410   struct sys_thread *thread;
    00411   thread = current_thread();
    00412   return(&thread->timeouts);
    00413   }
    00414
    00415 /***
    00416  END
    00417  ***/