本文整理汇总了C++中Collector::callback方法的典型用法代码示例。如果您正苦于以下问题：C++ Collector::callback方法的具体用法？C++ Collector::callback怎么用？C++ Collector::callback使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Collector的用法示例。
在下文中一共展示了Collector::callback方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: rmb
//.........这里部分代码省略.........
tail = counter->tail;
head = counter->mmap_page->data_head;
rmb();
if (head < tail)
{
g_warning ("sysprof fails at ring buffers (head "FMT64", tail "FMT64"\n", head, tail);
tail = head;
}
#if 0
/* Verify that the double mapping works */
x = g_random_int() & mask;
g_assert (*(counter->data + x) == *(counter->data + x + n_bytes));
#endif
skip_samples = in_dead_period (collector);
#if 0
g_print ("n bytes %d\n", head - tail);
#endif
while (head - tail >= sizeof (struct perf_event_header))
{
struct perf_event_header *header;
guint8 buffer[4096];
guint8 *free_me;
free_me = NULL;
/* Note that:
*
* - perf events are a multiple of 64 bits
* - the perf event header is 64 bits
* - the data area is a multiple of 64 bits
*
* which means there will always be space for one header, which means we
* can safely dereference the size field.
*/
header = (struct perf_event_header *)(counter->data + (tail & mask));
if (header->size > head - tail)
{
/* The kernel did not generate a complete event.
* I don't think that can happen, but we may as well
* be paranoid.
*/
break;
}
if (counter->data + (tail & mask) + header->size > counter->data + n_bytes)
{
int n_before, n_after;
guint8 *b;
if (header->size > sizeof (buffer))
free_me = b = g_malloc (header->size);
else
b = buffer;
n_after = (tail & mask) + header->size - n_bytes;
n_before = header->size - n_after;
memcpy (b, counter->data + (tail & mask), n_before);
memcpy (b + n_before, counter->data, n_after);
header = (struct perf_event_header *)b;
}
if (!skip_samples || header->type != PERF_RECORD_SAMPLE)
{
if (header->type == PERF_RECORD_SAMPLE)
collector->n_samples++;
process_event (collector, counter, (counter_event_t *)header);
}
if (free_me)
g_free (free_me);
tail += header->size;
}
counter->tail = tail;
counter->mmap_page->data_tail = tail;
if (collector->callback)
{
if (collector->n_samples - collector->prev_samples >= N_WAKEUP_EVENTS)
{
gboolean first_sample = collector->prev_samples == 0;
collector->callback (first_sample, collector->data);
collector->prev_samples = collector->n_samples;
}
}
}