pd.if.org Git - liblfds/blob - liblfds/liblfds7.0.0/liblfds700/src/lfds700_queue_bounded_singleconsumer_singleproducer/lfds700_queue_bounded_singleconsumer_singleproducer_dequeue.c

   1 /***** includes *****/
   2 #include "lfds700_queue_bounded_singleconsumer_singleproducer_internal.h"
   3
   4
   5
   6
   7
   8 /****************************************************************************/
   9 int lfds700_queue_bss_dequeue( struct lfds700_queue_bss_state *qbsss, void **key, void **value )
  10 {
  11   int
  12     rv = 0;
  13
  14   struct lfds700_queue_bss_element
  15     *qbsse;
  16
  17   LFDS700_PAL_ASSERT( qbsss != NULL );
  18   // TRD : key can be NULL
  19   // TRD : value can be NULL
  20
  21   LFDS700_MISC_BARRIER_LOAD;
  22
  23   if( qbsss->read_index != qbsss->write_index )
  24   {
  25     qbsse = qbsss->element_array + qbsss->read_index;
  26
  27     if( key != NULL )
  28       *key = qbsse->key;
  29
  30     if( value != NULL )
  31       *value = qbsse->value;
  32
  33     qbsss->read_index = (qbsss->read_index + 1) & qbsss->mask;
  34
  35     LFDS700_MISC_BARRIER_STORE;
  36
  37     rv = 1;
  38   }
  39
  40   return( rv );
  41 }
  42