C++ RELEASE_LOCK函数代码示例

int
channel_clear(void)
{
	  int cca;
	  int radio_was_off = 0;
	  PRINTF("CCA\n");
	  /* If the radio is locked by an underlying thread (because we are
	     being invoked through an interrupt), we preted that the coast is
	     clear (i.e., no packet is currently being transmitted by a
	     neighbor). */
	  if(locked) {
	    return 1;
	  }

	  GET_LOCK();
	  if(!receive_on) {
	    radio_was_off = 1;
	    cc2520_on();
	  }
	  /* Make sure that the radio really got turned on. */
	  if(!receive_on) {
	    RELEASE_LOCK();
	    if(radio_was_off) {
	      cc2520_off();
	    }
	    return 1;
	  }
	  cca = cc2520ll_channel_clear();
	  if(radio_was_off) {
	    cc2520_off();
	  }
	  RELEASE_LOCK();
	  return cca;
}

PRIVATE
void
ListFree( void * unit )
{
   int done = FALSE;

   LIST_UNIT * lu;

   ALLOC_UNIT * t   = NULL;
   ALLOC_UNIT * tbl = NULL;

   WAIT_FOR_LOCK( LIST_MUTEX );

   for( t = GLOBAL_ALLOC_TABLE; t; t = (ALLOC_UNIT *)tbl -> prev )
      tbl = t;

   if( !tbl )
   {
      DBG(PF( "Error freeing list structure.\n" ));
      RELEASE_LOCK( LIST_MUTEX );
      return;
   }

   lu = (LIST_UNIT *)( (int) unit - sizeof( int ) );

   if( lu -> check != ALLOC_USED_FLAG )
   {
      ERROR( "Free of a corrupt list node from allocation table." );
      RELEASE_LOCK( LIST_MUTEX );
      return;
   }

   do
   {
      if ( (unit >= tbl -> min) && (unit < tbl -> max) )
      {
         tbl -> avail++;

         lu -> check = ALLOC_FREE_FLAG;

         lu -> ptr_a = NULL;
         lu -> ptr_b = NULL;
         lu -> ptr_c = NULL;

         done = TRUE;

         break;
      }
      else
      {
         tbl = (ALLOC_UNIT *)tbl -> next;
      }

   } while( tbl && !done );

   if ( !done )
      ERROR( "Couldn't find list in allocation table\n" );

   RELEASE_LOCK( LIST_MUTEX );
}

NET_API_STATUS
Parse(
    IN DWORD argc,
    IN LPTSTR argv[]
    )
/*++

Routine Description :

    Wrapper function of the real worker Parse2 function.

Arguments :
    argc : argument count
    argv : argument string array pointer.

Return Value :
    return  NO_ERROR if successfully parse parameter
            ERROR_INVALID_PARAMETER, otherwise

--*/
{
    NET_API_STATUS  ApiStatus;
    LPNET_CONFIG_HANDLE ConfigHandle;

    // Get read-write lock for config data.  (The lock is for the in-memory
    // version of the data, which we're going to set.)
    ACQUIRE_LOCK( ReplGlobalConfigLock );

    // Open the config file (nt.cfg)
    ApiStatus = NetpOpenConfigData(
            & ConfigHandle,
            NULL,                 // local machine
            SECT_NT_REPLICATOR,   // section name
            TRUE);                // read-only


    if (ApiStatus != NO_ERROR) {
        NetpKdPrint(( "[REPL] Parse() can't open config section.\n" ));
        ReplFinish(
            SERVICE_UIC_CODE(
                SERVICE_UIC_SYSTEM,
                ApiStatus),
            NULL);

        RELEASE_LOCK( ReplGlobalConfigLock );
        return( ApiStatus );
    }


    ApiStatus = Parse2(argc, argv, ConfigHandle);

    // close config file ..

    (void) NetpCloseConfigData( ConfigHandle );

    RELEASE_LOCK( ReplGlobalConfigLock );

    return( ApiStatus );
}

static int32_t
rtp_sinker_consume(network_sinker *ns, proto_watch *pw,
                   int32_t stm_i, msg *m, uint32_t seq)
{
    int32_t ret = -ENOMEM;
    media_sinker *sinker = (media_sinker*)ns;
    rtp_sinker *rs = (rtp_sinker*)ns;
    media_sinker *ms = (media_sinker*)ns;
    mem_block *mb;
    network_client *nc = (network_client*)rs->interleaved;

    if (rs->trans_mode == RTP_OVER_UDP)
    {
        BUG_ON(!pw);
        proto_watch_ref(pw);
        RELEASE_LOCK(sinker->lock);

        msg_ref(m);
        ret = proto_watch_write(pw, m, seq, 0);
        proto_watch_unref(pw);

        AQUIRE_LOCK(sinker->lock);
        return ret;
    }

    mb = rtp_msg_to_interleaved_mb(m, ns->stms[stm_i].interleaved);
    if (mb)
    {
        MEMBLOCK_SET_SEQ(mb, seq);
        if (rs->trans_mode == RTP_OVER_TCP)
        {
            BUG_ON(!pw);
            proto_watch_ref(pw);
            RELEASE_LOCK(sinker->lock);

            msg_ref(m);
            ret = proto_watch_write_mb(pw, mb, 0);
            proto_watch_unref(pw);

            AQUIRE_LOCK(sinker->lock);
        }
        else
        {
            BUG_ON(!nc);
            RELEASE_LOCK(ms->lock);

            msg_ref(m);
            ret = network_client_send_mb(nc, mb, 0);

            AQUIRE_LOCK(ms->lock);
        }
    }

    return ret;
}

static void
ldl_op_fuck(void *data, void *user_data)
{
	int32_t err;
	media_info msi;
	tp_block *tb = (tp_block*)data;
	ldl_src *ldl = (ldl_src*)tb->ls;

	switch (tb->action)
	{
	case ACTION_PROBE:
		media_info_init(&msi);
		err = __ldl_src_probe(ldl, &tb->mrl, &msi);
		media_src_fill_info((media_src*)ldl, &msi, err);
		media_info_clear(&msi);

#ifdef DEVICE_INTERFACE_TEST
		void ldl_interfaces_test(media_uri *mrl);
		ldl_interfaces_test(&tb->mrl);
#endif
		break;

	case ACTION_OPEN:
		AQUIRE_LOCK(ldl->ldl_lock);
		err = __ldl_src_open(ldl, &tb->mrl);
		RELEASE_LOCK(ldl->ldl_lock);
		media_src_open_end((media_src*)ldl, err);
		break;

	case ACTION_PLAY:
		AQUIRE_LOCK(ldl->ldl_lock);
		__ldl_src_play(ldl);
		RELEASE_LOCK(ldl->ldl_lock);
		break;

	case ACTION_CTRL:
		AQUIRE_LOCK(ldl->ldl_lock);
		__ldl_src_ctrl(ldl, 1, NULL);
		RELEASE_LOCK(ldl->ldl_lock);
		break;

	case ACTION_CLOSE:
		AQUIRE_LOCK(ldl->ldl_lock);
		__ldl_src_kill(ldl);
		RELEASE_LOCK(ldl->ldl_lock);
		break;

	default:
		break;
	}

    media_src_unref((media_src*)ldl);
    tr_free(tb, sizeof(*tb));
}

BOOLEAN SRVFASTCALL
SrvCheckAndReferenceEndpoint (
    PENDPOINT Endpoint
    )

/*++

Routine Description:

    This function atomically verifies that an endpoint is active and
    increments the reference count on the endpoint if it is.

Arguments:

    Endpoint - Address of endpoint

Return Value:

    BOOLEAN - Returns TRUE if the endpoint is active, FALSE otherwise.

--*/

{
    PAGED_CODE( );

    //
    // Acquire the lock that guards the endpoint's state field.
    //

    ACQUIRE_LOCK( &SrvEndpointLock );

    //
    // If the endpoint is active, reference it and return TRUE.
    //

    if ( GET_BLOCK_STATE(Endpoint) == BlockStateActive ) {

        SrvReferenceEndpoint( Endpoint );

        RELEASE_LOCK( &SrvEndpointLock );

        return TRUE;

    }

    //
    // The endpoint isn't active.  Return FALSE.
    //

    RELEASE_LOCK( &SrvEndpointLock );

    return FALSE;

} // SrvCheckAndReferenceEndpoint

/*---------------------------------------------------------------------------*/
static int
send(const void *payload, unsigned short payload_len)
{
	int res = 0;
	GET_LOCK();
	cc2520ll_prepare(payload, payload_len);
	RELEASE_LOCK();
	GET_LOCK();
	res =  cc2520ll_transmit();
	RELEASE_LOCK();

	return res;
}

/*---------------------------------------------------------------------------*/
static int
cc2520_prepare(const void *payload, unsigned short payload_len)
{
  uint8_t total_len;
  GET_LOCK();

  PRINTF("cc2520: sending %d bytes\n", payload_len);
  /*int i;
  for(i = 0; i < payload_len;i++)
	  printf("%x",((uint8_t *) payload)[i]);
  printf("\n");*/
  RIMESTATS_ADD(lltx);

  /* Wait for any previous transmission to finish. */
  /*  while(status() & BV(CC2520_TX_ACTIVE));*/

  /* Write packet to TX FIFO. */
  strobe(CC2520_INS_SFLUSHTX);

  total_len = payload_len + FOOTER_LEN;
  CC2520_WRITE_FIFO_BUF(&total_len, 1);
  CC2520_WRITE_FIFO_BUF(payload, payload_len);

  RELEASE_LOCK();
  return 0;
}

/*---------------------------------------------------------------------------*/
int
cc2420_set_channel(int c)
{
  uint16_t f;

  GET_LOCK();
  /*
   * Subtract the base channel (11), multiply by 5, which is the
   * channel spacing. 357 is 2405-2048 and 0x4000 is LOCK_THR = 1.
   */
  channel = c;

  f = 5 * (c - 11) + 357 + 0x4000;
  /*
   * Writing RAM requires crystal oscillator to be stable.
   */
  BUSYWAIT_UNTIL((status() & (BV(CC2420_XOSC16M_STABLE))), RTIMER_SECOND / 10);

  /* Wait for any transmission to end. */
  BUSYWAIT_UNTIL(!(status() & BV(CC2420_TX_ACTIVE)), RTIMER_SECOND / 10);

  setreg(CC2420_FSCTRL, f);

  /* If we are in receive mode, we issue an SRXON command to ensure
     that the VCO is calibrated. */
  if(receive_on) {
    strobe(CC2420_SRXON);
  }

  RELEASE_LOCK();
  return 1;
}

/*---------------------------------------------------------------------------*/
static int
cc2420_prepare(const void *payload, unsigned short payload_len)
{
  uint8_t total_len;
#if CC2420_CONF_CHECKSUM
  uint16_t checksum;
#endif /* CC2420_CONF_CHECKSUM */
  GET_LOCK();

  PRINTF("cc2420: sending %d bytes\n", payload_len);

  RIMESTATS_ADD(lltx);

  /* Wait for any previous transmission to finish. */
  /*  while(status() & BV(CC2420_TX_ACTIVE));*/

  /* Write packet to TX FIFO. */
  strobe(CC2420_SFLUSHTX);

#if CC2420_CONF_CHECKSUM
  checksum = crc16_data(payload, payload_len, 0);
#endif /* CC2420_CONF_CHECKSUM */
  total_len = payload_len + AUX_LEN;
  CC2420_WRITE_FIFO_BUF(&total_len, 1);
  CC2420_WRITE_FIFO_BUF(payload, payload_len);
#if CC2420_CONF_CHECKSUM
  CC2420_WRITE_FIFO_BUF(&checksum, CHECKSUM_LEN);
#endif /* CC2420_CONF_CHECKSUM */

  RELEASE_LOCK();
  return 0;
}

/* There may be at most one additional tick fired after a call to this */
void
stopTicker(void)
{
    ACQUIRE_LOCK(&mutex);
    stopped = 1;
    RELEASE_LOCK(&mutex);
}

/*---------------------------------------------------------------------------*/
int
cc2520_rssi(void)
{
  int rssi;
  int radio_was_off = 0;

  if(locked) {
    return 0;
  }

  GET_LOCK();

  if(!receive_on) {
    radio_was_off = 1;
    cc2520_on();
  }
  BUSYWAIT_UNTIL(status() & BV(CC2520_RSSI_VALID), RTIMER_SECOND / 100);

  rssi = (int)((signed char)getreg(CC2520_RSSI));

  if(radio_was_off) {
    cc2520_off();
  }
  RELEASE_LOCK();
  return rssi;
}

/*---------------------------------------------------------------------------*/
void
cc2520_set_pan_addr(unsigned pan,
                    unsigned addr,
                    const uint8_t *ieee_addr)
{
  uint8_t tmp[2];

  GET_LOCK();

  /*
   * Writing RAM requires crystal oscillator to be stable.
   */
  BUSYWAIT_UNTIL(status() & (BV(CC2520_XOSC16M_STABLE)), RTIMER_SECOND / 10);

  tmp[0] = pan & 0xff;
  tmp[1] = pan >> 8;
  CC2520_WRITE_RAM(&tmp, CC2520RAM_PANID, 2);


  tmp[0] = addr & 0xff;
  tmp[1] = addr >> 8;
  CC2520_WRITE_RAM(&tmp, CC2520RAM_SHORTADDR, 2);
  if(ieee_addr != NULL) {
    int f;
    uint8_t tmp_addr[8];
    // LSB first, MSB last for 802.15.4 addresses in CC2520
    for (f = 0; f < 8; f++) {
      tmp_addr[7 - f] = ieee_addr[f];
    }
    CC2520_WRITE_RAM(tmp_addr, CC2520RAM_IEEEADDR, 8);
  }
  RELEASE_LOCK();
}

nat
freeTaskManager (void)
{
    Task *task, *next;
    nat tasksRunning = 0;

    ACQUIRE_LOCK(&all_tasks_mutex);

    for (task = all_tasks; task != NULL; task = next) {
        next = task->all_next;
        if (task->stopped) {
            freeTask(task);
        } else {
            tasksRunning++;
        }
    }

    debugTrace(DEBUG_sched, "freeing task manager, %d tasks still running",
               tasksRunning);

    all_tasks = NULL;

    RELEASE_LOCK(&all_tasks_mutex);

#if defined(THREADED_RTS)
    closeMutex(&all_tasks_mutex); 
#if !defined(MYTASK_USE_TLV)
    freeThreadLocalKey(&currentTaskKey);
#endif
#endif

    tasksInitialized = 0;

    return tasksRunning;
}

void traceCapEvent_ (Capability   *cap,
                     EventTypeNum  tag)
{
#ifdef DEBUG
    if (RtsFlags.TraceFlags.tracing == TRACE_STDERR) {
        ACQUIRE_LOCK(&trace_utx);

        tracePreface();
        switch (tag) {
        case EVENT_CAP_CREATE:   // (cap)
            debugBelch("cap %d: initialised\n", cap->no);
            break;
        case EVENT_CAP_DELETE:   // (cap)
            debugBelch("cap %d: shutting down\n", cap->no);
            break;
        case EVENT_CAP_ENABLE:   // (cap)
            debugBelch("cap %d: enabling capability\n", cap->no);
            break;
        case EVENT_CAP_DISABLE:  // (cap)
            debugBelch("cap %d: disabling capability\n", cap->no);
            break;
        }
        RELEASE_LOCK(&trace_utx);
    } else
#endif
    {
        if (eventlog_enabled) {
            postCapEvent(tag, (EventCapNo)cap->no);
        }
    }
}