Write Barrier: Function

Functions
static __inline void	tm_write_barrier_node (tm_node *n)
	Must be called after any ptrs within the tm_node n are mutated.
void	__tm_write_barrier_ignore (void *ptr)
	Write barrier for nothing.

---

Function Documentation

void __tm_write_barrier_ignore

(

void *

ptr

)

Write barrier for nothing.

DO NOTHING

Definition at line 115 of file barrier.c.

{
}

static __inline void tm_write_barrier_node

(

tm_node *

n

)

[static]

Must be called after any ptrs within the tm_node n are mutated.

If node is tm_ECRU, It has not been reached yet.

If node is tm_GREY, it is already marked for scanning.

If this node is already being scanned, resume scanning on another node.

This should be very rare.

See _tm_node_scan_some().

If node is tm_BLACK, The node has already been marked and scanned. The mutator may have introduced new pointers to ECRU nodes.

Reschedule it to be scanned.

Definition at line 41 of file barrier.c.

References tm_data::node_color_iter, tm_node_iterator::scan_node, tm, tm_abort(), tm_BLACK, tm_ECRU, tm_GREY, tm_msg(), tm_node_color, tm_node_set_color(), tm_node_to_block(), tm_time_stat_begin(), tm_time_stat_end(), tm_data::trigger_full_gc, and tm_data::ts_barrier_black.

Referenced by __tm_write_barrier(), and __tm_write_barrier_pure().

{
  switch ( tm_node_color(n) ) {
  case tm_ECRU:
    /**
     * If node is tm_ECRU,
     * It has not been reached yet.
     */
    break;

  case tm_GREY:
    /**
     * If node is tm_GREY,
     * it is already marked for scanning.
     */

    /**
     * If this node is already being scanned,
     * resume scanning on another node.
     *
     * This should be very rare.
     *
     * See _tm_node_scan_some().
     */
    if ( tm.node_color_iter[tm_GREY].scan_node == n ) {
      // tm_abort();
#if 0
      fprintf(stderr, "*");
      fflush(stderr);
#endif
      tm.trigger_full_gc = 1;
    }
    break;

  case tm_BLACK:
    /**
     * If node is tm_BLACK,
     * The node has already been marked and scanned.
     * The mutator may have introduced new pointers
     * to ECRU nodes.
     *
     * Reschedule it to be scanned.
     */
#if tm_TIME_STAT
    tm_time_stat_begin(&tm.ts_barrier_black);
#endif

    tm_node_set_color(n, tm_node_to_block(n), tm_GREY);

#if 0
    fprintf(stderr, "G");
    fflush(stderr);
#endif

#if tm_TIME_STAT
    tm_time_stat_end(&tm.ts_barrier_black);
#endif
#if 0
    tm_msg("w b n%p\n", n);
#endif
    break;

  default:
    tm_abort();
    break;
  }
}

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