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Add comment explaining NULL case in circular_buffer::enqueue and add logging to ::dequeue.

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This commit is contained in:
Michael Bebenita 2010-07-28 00:01:31 -07:00 committed by Graydon Hoare
parent d6cba83322
commit c5e0ea7276
1 changed files with 7 additions and 1 deletions
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8
src/rt/circular_buffer.cpp
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@ -91,7 +91,8 @@ circular_buffer::enqueue(void *src) {
/** /**
* Copies data from this buffer to the "dst" address. The buffer is * Copies data from this buffer to the "dst" address. The buffer is
* shrunk if possible. * shrunk if possible. If the "dst" address is NULL, then the message
* is dequeued but is not copied.
*/ */
void void
circular_buffer::dequeue(void *dst) { circular_buffer::dequeue(void *dst) {
@ -100,6 +101,11 @@ circular_buffer::dequeue(void *dst) {
I(dom, _unread <= _buffer_sz); I(dom, _unread <= _buffer_sz);
I(dom, _buffer); I(dom, _buffer);
dom->log(rust_log::MEM | rust_log::COMM,
"circular_buffer dequeue "
"unread: %d, buffer_sz: %d, unit_sz: %d",
_unread, _buffer_sz, unit_sz);
if (dst != NULL) { if (dst != NULL) {
memcpy(dst, &_buffer[_next], unit_sz); memcpy(dst, &_buffer[_next], unit_sz);
} }