C++ ObtainSemaphore函数代码示例

struct AHI_AudioDatabase *
LockDatabaseWrite(void)
{
  struct AHI_AudioDatabase *audiodb;

  Forbid();

  audiodb = (struct AHI_AudioDatabase *) FindSemaphore(ADB_NAME);

  if(audiodb != NULL)
  {
    ObtainSemaphore((struct SignalSemaphore *) audiodb);
  }
  else
  {
    audiodb = (struct AHI_AudioDatabase *)
        AllocVec(sizeof(struct AHI_AudioDatabase), MEMF_PUBLIC|MEMF_CLEAR);

    if(audiodb != NULL)
    {

      NewList( (struct List *) &audiodb->ahidb_AudioModes);

      audiodb->ahidb_Semaphore.ss_Link.ln_Name = audiodb->ahidb_Name;
      audiodb->ahidb_Semaphore.ss_Link.ln_Pri  = 20;
      strcpy(audiodb->ahidb_Semaphore.ss_Link.ln_Name, ADB_NAME);

      AddSemaphore((struct SignalSemaphore *) audiodb);
      ObtainSemaphore((struct SignalSemaphore *) audiodb);
    }
  }
  Permit();

  return audiodb;
}

int uae_sem_wait (uae_sem_t *sem)
{
    int result = -1;

    ObtainSemaphore (&sem->mutex);

    if (sem->live) {
	if (sem->value > 0) {
	    --sem->value;
	    result = 0;
        } else {
	    ReleaseSemaphore (&sem->mutex);

	    /* Block on this semaphore by waiting for
	     * the proxy thread to reply to our lock request
	     */
	    result = BlockMe (sem);

	    ObtainSemaphore (&sem->mutex);

	    if (result != -1)
		--sem->value;
	}
    }
    ReleaseSemaphore (&sem->mutex);
    return result;
}

VOID
DriverCleanup( struct DriverBase* AHIsubBase )
{
  struct EMU10kxBase* EMU10kxBase = (struct EMU10kxBase*) AHIsubBase;
  int i;

  if( EMU10kxBase->camd.Semaphore.ss_Link.ln_Name != NULL )
  {
    ObtainSemaphore( &EMU10kxBase->camd.Semaphore );
    RemSemaphore( &EMU10kxBase->camd.Semaphore );
    ReleaseSemaphore( &EMU10kxBase->camd.Semaphore );
  }

  if( EMU10kxBase->ac97.Semaphore.ss_Link.ln_Name != NULL )
  {
    ObtainSemaphore( &EMU10kxBase->ac97.Semaphore );
    RemSemaphore( &EMU10kxBase->ac97.Semaphore );
    ReleaseSemaphore( &EMU10kxBase->ac97.Semaphore );
  }
  
  for( i = 0; i < EMU10kxBase->cards_found; ++i )
  {
    emu10k1_irq_disable( &EMU10kxBase->driverdatas[ i ]->card,
			 INTE_MIDIRXENABLE );
    emu10k1_irq_disable( &EMU10kxBase->driverdatas[ i ]->card,
			 INTE_MIDITXENABLE );
    
    FreeDriverData( EMU10kxBase->driverdatas[ i ], AHIsubBase );
  }

  FreeVec( EMU10kxBase->driverdatas ); 
 
  CloseLibrary( OpenPciBase );
  CloseLibrary( (struct Library*) DOSBase );
}

BOOL AddClusterReceiver(
	struct MidiCluster *cluster,
	struct Node *node,
	ULONG *ErrorCode,
	struct CamdBase *CamdBase
){
	struct MidiLink *midilink;
	struct DriverData *driverdata;
	struct MyMidiCluster *mycluster=(struct MyMidiCluster *)cluster;

	if(node->ln_Type!=NT_USER-MLTYPE_NTypes){
	  driverdata=FindSenderDriverInCluster(cluster);
	  if(driverdata!=NULL){
			if(driverdata->isInOpen==FALSE && driverdata->isOutOpen==FALSE){
				if(OpenDriver(driverdata,ErrorCode,CamdBase)==FALSE){
					return FALSE;
				}
	  
				driverdata->isInOpen=TRUE;
			}
		}
		midilink=(struct MidiLink *)node;
		ObtainSemaphore(&mycluster->semaphore);
		midilink->ml_Location=cluster;
	}else{
		/* The receiver is a hardware-receiver, not a midilink. */
		ObtainSemaphore(&mycluster->semaphore);
	}

	Enqueue(&cluster->mcl_Receivers,node);
	ReleaseSemaphore(&mycluster->semaphore);

	return TRUE;
}

void __initdetach(void)
{ struct Library *DOSBase,*SysBase = *(struct Library **)4;
  struct SignalSemaphore *sema;

  if (_WBenchMsg)
    return;

  if ((sema=sem)) {        /* I must be the child process */
    ObtainSemaphore(sema); /* Assert that my parent is already dead */
    ReleaseSemaphore(sema);
    FreeMem(sema,sizeof(*sema));
    return;
  }
                          /* I must be the parent */
  if ((sem=sema=(struct SignalSemaphore *)AllocMem(sizeof(*sema),MEMF_PUBLIC|MEMF_CLEAR))) {

    InitSemaphore(sema);

    if ((DOSBase=OpenLibrary(__dosname,30))) {

      struct CommandLineInterface *cli = Cli();
      APTR pr,stack = __SaveSP;

      ObtainSemaphore(sema); /* Assert that my child is suspended until I'm finished */

      pr = CreateNewProcTags(NP_Seglist,cli->cli_Module, /* child process gets my seglist */
                             NP_FreeSeglist,1,           /* and must free it */
                             NP_Cli,1,                   /* it must be a CLI process */
                             NP_StackSize,__stack,       /* it gets a stack */
                             NP_Name,(ULONG)__procname,  /* a name */
                             NP_Priority,__priority,     /* a priority */
                             NP_Arguments,(ULONG)__commandline,/* and my commandline Arguments */
                             TAG_END);
      CloseLibrary(DOSBase);

      if (pr) {

        cli->cli_Module = 0; /* I'm no longer owner of this */

        /* Adjust stack, release semaphore and return 0 in one.
         * Maybe the 3 movel are a bit too cautious, but they ARE working
         */
        asm("movel %0,sp;movel %1,a6;movel %2,a0;moveql #0,d0;jmp [email protected](-570)"::
            "r"(stack),"r"(SysBase),"r"(sema):"sp","a6","a0");
      }

      ReleaseSemaphore(sema); /* Again only caution - you never know */
    }
    FreeMem(sema,sizeof(*sema)); /* Couldn't start child :( */
  }

OOP_Object *SDLMouse__Root__New(OOP_Class *cl, OOP_Object *o, struct pRoot_New *msg) {
    BOOL has_mouse_hidd = FALSE;
    struct mousedata *mousedata;

    D(bug("[sdl] SDLMouse::New\n"));

    ObtainSemaphoreShared(&LIBBASE->lock);
    if (LIBBASE->mousehidd != NULL)
        has_mouse_hidd = TRUE;
    ReleaseSemaphore(&LIBBASE->lock);

    if (has_mouse_hidd) {
        D(bug("[sdl] mouse hidd already present, can't make another one\n"));
        return NULL;
    }

    if ((o = (OOP_Object *) OOP_DoSuperMethod(cl, o, (OOP_Msg) msg)) == NULL) {
        D(bug("[sdl] supermethod failed, bailing out\n"));
        return NULL;
    }

    mousedata = OOP_INST_DATA(cl, o);

    mousedata->callback = GetTagData(aHidd_Mouse_IrqHandler, NULL, msg->attrList);
    mousedata->callbackdata = GetTagData(aHidd_Mouse_IrqHandlerData, NULL, msg->attrList);

    ObtainSemaphore(&LIBBASE->lock);
    LIBBASE->mousehidd = o;
    ReleaseSemaphore(&LIBBASE->lock);

    D(bug("[sdl] created mouse hidd, callback 0x%08x, data 0x%08x\n", mousedata->callback, mousedata->callbackdata));

    return (OOP_Object *) o;
}

int __saveds __asm LIBReadUnreadTexts(
  register __a0 struct UnreadTexts *unreadTexts,
  register __d0 int userId,
  register __a6 struct NiKomBase *NiKomBase) {
  BPTR file;
  char filepath[41];
  int readRes, convertRes;

  ObtainSemaphore(&NiKomBase->Servermem->semaphores[NIKSEM_UNREAD]);

  convertRes = maybeConvertUnreadTextsData(userId, unreadTexts, NiKomBase);
  if(convertRes != 2) {
    ReleaseSemaphore(&NiKomBase->Servermem->semaphores[NIKSEM_UNREAD]);
    return convertRes;
  }

  MakeUserFilePath(filepath, userId, "UnreadTexts");
  if(!(file = Open(filepath, MODE_OLDFILE))) {
    ReleaseSemaphore(&NiKomBase->Servermem->semaphores[NIKSEM_UNREAD]);
    return 0;
  }
  readRes = Read(file, unreadTexts, sizeof(struct UnreadTexts));
  Close(file);
  ReleaseSemaphore(&NiKomBase->Servermem->semaphores[NIKSEM_UNREAD]);

  return readRes == sizeof(struct UnreadTexts);
}

void
RethinkPlayers ( struct AHIDevUnit *iounit,
                 struct AHIBase *AHIBase )
{
  struct MinList templist;
  struct AHIRequest *ioreq;

  NewList((struct List *) &templist);

  ObtainSemaphore(&iounit->ListLock);

  RemPlayers((struct List *) &iounit->PlayingList, iounit, AHIBase);
  RemPlayers((struct List *) &iounit->SilentList, iounit, AHIBase);

  // Move all silent requests to our temporary list

  while((ioreq = (struct AHIRequest *) RemHead((struct List *) &iounit->SilentList)))
  {
    AddTail((struct List *) &templist, (struct Node *) ioreq);
  }

  // And add them back...
  while((ioreq = (struct AHIRequest *) RemHead((struct List *) &templist)))
  {
    AddWriter(ioreq, iounit, AHIBase);
  }

  ReleaseSemaphore(&iounit->ListLock);
}

int writefiles(int area)
{
	struct Node *nod;
	BPTR fh;
	char datafil[110];
	int index;

	ObtainSemaphore(&Servermem->semaphores[NIKSEM_FILEAREAS]);

	sprintf(datafil,"nikom:datocfg/areor/%d.dat",area);

	if(!(fh=Open(datafil,MODE_NEWFILE)))
	{
		ReleaseSemaphore(&Servermem->semaphores[NIKSEM_FILEAREAS]);
		return 1;
	}

	index=0;
	nod = ((struct List *)&Servermem->areor[area].ar_list)->lh_Head;
	while(nod->ln_Succ)
	{
		if(Write(fh,nod,sizeof(struct DiskFil)) != sizeof(struct DiskFil)) {
			Close(fh);
			ReleaseSemaphore(&Servermem->semaphores[NIKSEM_FILEAREAS]);
			return 3;
		}
		((struct Fil *)nod)->index = index++;
		nod = nod->ln_Succ;
	}
	Close(fh);

	ReleaseSemaphore(&Servermem->semaphores[NIKSEM_FILEAREAS]);

	return 0;
}

void MorphOS_LockMutex(struct SignalSemaphore *mutex)
{
	if (mutex)
	{
		ObtainSemaphore(mutex);
	}
}

void
FeedReaders ( struct AHIDevUnit *iounit,
              struct AHIBase *AHIBase )
{
  struct AHIRequest *ioreq;

  ObtainSemaphore(&iounit->ListLock);
  for(ioreq = (struct AHIRequest *)iounit->ReadList.mlh_Head;
      ioreq->ahir_Std.io_Message.mn_Node.ln_Succ;
      ioreq = (struct AHIRequest *)ioreq->ahir_Std.io_Message.mn_Node.ln_Succ)
  {
    FillReadBuffer(ioreq, iounit, AHIBase);
  }

  // Check if Reader-list is empty. If so, stop recording (after a small delay).

  if( ! iounit->ReadList.mlh_Head->mln_Succ )
  {
    if(--iounit->RecordOffDelay == 0)
    {
      AHI_ControlAudio(iounit->AudioCtrl,
          AHIC_Record,FALSE,
          TAG_DONE);
      iounit->IsRecording = FALSE;
    }
  }
  else
  {
    iounit->RecordOffDelay = 2;
  }

  ReleaseSemaphore(&iounit->ListLock);
}

void __saveds Pdebug(const char *fmt, ...){
	va_list argp;

	if(dodebug==0) return;

	if(0==semaphoreinit){
		InitSemaphore(&PdebugSemaphore);
		semaphoreinit=1;
	}

	va_start(argp,fmt);

	ObtainSemaphore(&PdebugSemaphore);

		if(lastpdebug<19){

			vsprintf(&pdebugg[lastpdebug][0],fmt,argp);
			lastpdebug++;

			Signal(mytask,debugsig);
		}

	ReleaseSemaphore(&PdebugSemaphore);

	va_end(argp);
}

BOOL util_RemNamedObject(pUtility UtilBase, struct NamedObject *object, struct Message *message)
{
	Forbid();
	struct NameSpace *ns = SYSTEM(object)->no_Nos.nos_NameSpace;
	if (ns == NULL)
	{
		if (message != NULL) 
		{
			message->mn_Node.ln_Name = NULL;
			ReplyMsg(message);
		}
		Permit();
		return TRUE;
	}
	if (message == NULL) 
	{
		if (SYSTEM(object)->no_Non.non_UseCount != 1)
		{
			Permit();
			return TRUE;
		}
	}

	SYSTEM(object)->no_Nos.nos_NameSpace = NULL;
	ObtainSemaphore(&ns->ns_Semaphore);
	Remove(&SYSTEM(object)->no_Non.non_Node);
	if (message != NULL)
	{
		SYSTEM(object)->no_Nos.nos_RemoveMsg = message;
		message->mn_Node.ln_Name = (STRPTR)object;
	}
	ReleaseSemaphore(&ns->ns_Semaphore);
	Permit();
	return ReleaseNamedObject(object);
}

int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
{
	int retval;


	if ( ! sem ) {
		SDL_SetError("Passed a NULL semaphore");
		return -1;
	}

	D(bug("WaitTimeout (%ld) semaphore...%lx\n",timeout,sem));

	/* A timeout of 0 is an easy case */
	if ( timeout == 0 ) {
		ObtainSemaphore(&sem->Sem);
		return 1;
	}
	if(!(retval=AttemptSemaphore(&sem->Sem)))
	{
		SDL_Delay(timeout);
		retval=AttemptSemaphore(&sem->Sem);
	}

	if(retval==TRUE)
	{
//		ReleaseSemaphore(&sem->Sem);
		retval=1;
	}

	return retval;
}

///
/// DumpDbgMalloc
// output all current allocations
void DumpDbgMalloc(void)
{
  ENTER();

  if(isFlagSet(debug_classes, DBC_MTRACK))
  {
    ULONG i;

    ObtainSemaphore(&DbgMallocListSema);

    D(DBF_ALWAYS, "%ld memory areas tracked", DbgMallocCount);
    for(i = 0; i < ARRAY_SIZE(DbgMallocList); i++)
    {
      struct Node *curNode;

      for(curNode = GetHead((struct List *)&DbgMallocList[i]); curNode != NULL; curNode = GetSucc(curNode))
      {
        struct DbgMallocNode *dmn = (struct DbgMallocNode *)curNode;

        _DPRINTF(DBC_MTRACK, DBF_ALWAYS, dmn->file, dmn->line, "memarea 0x%08lx, size/type %ld, func (%s)", dmn->memory, dmn->size, dmn->func);
      }
    }

    ReleaseSemaphore(&DbgMallocListSema);
  }

  LEAVE();
}