uisimulator/win32/kernel.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Felix Arends
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19
  20 #include <windows.h>
  21 #include "uisw32.h"
  22 #include "kernel.h"
  23 #include "thread-win32.h"
  24 #include "thread.h"
  25
  26 /* (Daniel 2002-10-31) Mingw32 requires this errno variable to be present.
  27    I'm not quite sure why and I don't know if this breaks the MSVC compile.
  28    If it does, we should put this within #ifdef __MINGW32__ */
  29 int errno;
  30
  31 int set_irq_level (int level)
  32 {
  33     static int _lv = 0;
  34     return (_lv = level);
  35 }
  36
  37 void sleep(int ticks)
  38 {
  39     Sleep (1000 / HZ * ticks);
  40 }
  41
  42
  43 void yield (void)
  44 {
  45     Sleep (1); /* prevent busy loop */
  46     PostThreadMessage (GetWindowThreadProcessId (hGUIWnd,NULL), TM_YIELD, 0, 0);
  47 }
  48
  49 void queue_init(struct event_queue *q)
  50 {
  51     q->read = 0;
  52     q->write = 0;
  53 }
  54
  55 void queue_wait(struct event_queue *q, struct event *ev)
  56 {
  57     while(q->read == q->write)
  58     {
  59         switch_thread();
  60     }
  61
  62     *ev = q->events[(q->read++) & QUEUE_LENGTH_MASK];
  63 }
  64
  65 void queue_wait_w_tmo(struct event_queue *q, struct event *ev, int ticks)
  66 {
  67     unsigned int timeout = current_tick + ticks;
  68
  69     while(q->read == q->write && TIME_BEFORE( current_tick, timeout ))
  70     {
  71         sleep(1);
  72     }
  73
  74     if(q->read != q->write)
  75     {
  76         *ev = q->events[(q->read++) & QUEUE_LENGTH_MASK];
  77     }
  78     else
  79     {
  80         ev->id = SYS_TIMEOUT;
  81     }
  82 }
  83
  84 void queue_post(struct event_queue *q, int id, void *data)
  85 {
  86     int wr;
  87     int oldlevel;
  88
  89     oldlevel = set_irq_level(15<<4);
  90     wr = (q->write++) & QUEUE_LENGTH_MASK;
  91
  92     q->events[wr].id = id;
  93     q->events[wr].data = data;
  94     set_irq_level(oldlevel);
  95 }
  96
  97 bool queue_empty(struct event_queue* q)
  98 {
  99     return ( q->read == q->write );
 100 }
 101
 102 void switch_thread (void)
 103 {
 104     yield ();
 105 }
 106
 107 /* TODO: Implement mutexes for win32 */
 108 void mutex_init(struct mutex *m)
 109 {
 110     (void)m;
 111 }
 112
 113 void mutex_lock(struct mutex *m)
 114 {
 115     (void)m;
 116 }
 117
 118 void mutex_unlock(struct mutex *m)
 119 {
 120     (void)m;
 121 }