test/semaphoretest.c

   1 /*
   2     Copyright © 1995-2002, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <proto/exec.h>
   7 #include <exec/memory.h>
   8 #include <exec/tasks.h>
   9 #include <exec/semaphores.h>
  10 #include <clib/exec_protos.h>
  11 #include <stdio.h>
  12
  13 struct SignalSemaphore *ss;
  14 int u[3];
  15
  16 #define STACKSIZE 4096
  17
  18 static void entry(void)
  19 {
  20     int i,k,os=2;
  21     u[2]=1;
  22     ObtainSemaphoreShared(&ss[2]);
  23     u[2]=2;
  24
  25     for(i=0;i<10;i++)
  26         for(k=0;k<3;k++)
  27         {
  28             u[k]=1;
  29             ObtainSemaphoreShared(&ss[k]);
  30             u[k]=2;
  31             ReleaseSemaphore(&ss[os]);
  32             u[os]=0;
  33
  34             os=k;
  35         }
  36
  37     Wait(0);/* Let the parent remove me */
  38 }
  39
  40 int main(int argc, char* argv[])
  41 {
  42     struct Task *t;
  43     struct MsgPort *mp;
  44     struct SemaphoreMessage *sm;
  45
  46     mp=CreateMsgPort();
  47     if(mp!=NULL)
  48     {
  49         sm=(struct SemaphoreMessage *)CreateIORequest(mp,sizeof(struct SemaphoreMessage));
  50         if(sm!=NULL)
  51         {
  52             ss=(struct SignalSemaphore *)AllocMem(3*sizeof(struct SignalSemaphore),
  53                                                 MEMF_PUBLIC|MEMF_CLEAR);
  54             if(ss!=NULL)
  55             {
  56                 InitSemaphore(&ss[0]);
  57                 InitSemaphore(&ss[1]);
  58                 InitSemaphore(&ss[2]);
  59                 ObtainSemaphore(&ss[2]);
  60                 printf("task 1: got %d\n",2);
  61
  62                 t=(struct Task *)AllocMem(sizeof(struct Task), MEMF_PUBLIC|MEMF_CLEAR);
  63                 if(t!=NULL)
  64                 {
  65                     UBYTE *s;
  66                     s=(UBYTE *)AllocMem(STACKSIZE, MEMF_PUBLIC|MEMF_CLEAR);
  67                     if(s!=NULL)
  68                     {
  69                         t->tc_Node.ln_Type=NT_TASK;
  70                         t->tc_Node.ln_Pri=1;
  71                         t->tc_Node.ln_Name="new task";
  72                         t->tc_SPLower=s;
  73                         t->tc_SPUpper=s+STACKSIZE;
  74 #if AROS_STACK_GROWS_DOWNWARDS
  75                         t->tc_SPReg=(UBYTE *)t->tc_SPUpper-SP_OFFSET;
  76 #else
  77                         t->tc_SPReg=(UBYTE *)t->tc_SPLower-SP_OFFSET;
  78 #endif
  79                         NEWLIST(&t->tc_MemEntry);
  80                         AddTask(t,&entry,NULL);
  81
  82                         {
  83                             int k,os=2;
  84                             for(k=0;k<3;k++)
  85                             {
  86                                 printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
  87                                 ObtainSemaphore(&ss[k]);
  88                                 printf("task 1: got %d\n",k);
  89                                 printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
  90                                 ReleaseSemaphore(&ss[os]);
  91                                 printf("task 1: released %d\n",os);
  92
  93                                 os=k;
  94                             }
  95                             printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
  96
  97                             ObtainSemaphoreShared(&ss[0]);
  98                             printf("task 1: got shared %d\n",0);
  99                             printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 100                             ObtainSemaphoreShared(&ss[1]);
 101                             printf("task 1: got shared %d\n",1);
 102                             printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 103
 104                             ReleaseSemaphore(&ss[0]);
 105                             printf("task 1: released %d\n",0);
 106                             printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 107                             ReleaseSemaphore(&ss[1]);
 108                             printf("task 1: released %d\n",1);
 109                             printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 110
 111                             for(k=0;k<3;k++)
 112                                 if(AttemptSemaphore(&ss[k]))
 113                                 {
 114                                     printf("task 1: got %d\n",k);
 115                                     printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 116                                     ReleaseSemaphore(&ss[k]);
 117                                     printf("task 1: released %d\n",k);
 118                                     printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 119                                 }
 120
 121                             for(k=0;k<3;k++)
 122                                 if(k!=os&&AttemptSemaphoreShared(&ss[k]))
 123                                 {
 124                                     printf("task 1: got %d\n",k);
 125                                     printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 126                                     ReleaseSemaphore(&ss[k]);
 127                                     printf("task 1: released %d\n",k);
 128                                     printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 129                                 }
 130
 131                             for(k=0;k<3;k++)
 132                             {
 133                                 sm->ssm_Message.mn_Node.ln_Name=(char *)SM_EXCLUSIVE;
 134                                 Procure(&ss[k],sm);
 135                                 printf("task 1: posted request for %d\n",k);
 136                                 printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 137                                 if(GetMsg(mp)!=NULL)
 138                                     printf("task 1: got it\n");
 139                                 else
 140                                     printf("task 1: didn't get it\n");
 141                                 printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 142                                 Vacate(&ss[k],sm);
 143                                 printf("task 1: released %d\n",k);
 144                                 printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 145                             }
 146
 147                             for(k=0;k<3;k++)
 148                                 if(k!=os)
 149                                 {
 150                                     sm->ssm_Message.mn_Node.ln_Name=(char *)SM_SHARED;
 151                                     Procure(&ss[k],sm);
 152                                     printf("task 1: posted request for %d\n",k);
 153                                     printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 154                                     if(GetMsg(mp)!=NULL)
 155                                         printf("task 1: got it\n");
 156                                     else
 157                                         printf("task 1: didn't get it\n");
 158                                     printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 159                                     Vacate(&ss[k],sm);
 160                                     printf("task 1: released %d\n",k);
 161                                     printf("task 2: %d %d %d\n",u[0],u[1],u[2]);
 162                                 }
 163                         }
 164                         RemTask(t);
 165
 166                         FreeMem(s,STACKSIZE);
 167                     }
 168                     FreeMem(t,sizeof(struct Task));
 169                 }
 170                 FreeMem(ss,3*sizeof(struct SignalSemaphore));
 171             }
 172             DeleteIORequest((struct IORequest *)sm);
 173         }
 174         DeleteMsgPort(mp);
 175     }
 176     return 0;
 177 }
 178
 179