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Cleanup circular_buffer grow / shrink routines

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This commit is contained in:
Brian Anderson 2011-01-07 23:35:29 -05:00 committed by Graydon Hoare
parent 6c6c9acd96
commit 4841c9f3f8
1 changed files with 7 additions and 4 deletions
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11
src/rt/circular_buffer.cpp
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@ -66,6 +66,8 @@ circular_buffer::enqueue(void *src) {
if (_next + _unread + unit_sz > _buffer_sz) {
size_t new_buffer_sz = _buffer_sz << 1;
I(dom, new_buffer_sz <= MAX_CIRCULAR_BUFFFER_SIZE);
dom->log(rust_log::MEM | rust_log::COMM,
"circular_buffer is growing to %d bytes", new_buffer_sz);
void *new_buffer = dom->malloc(new_buffer_sz);
transfer(new_buffer);
dom->free(_buffer);
@ -124,15 +126,16 @@ circular_buffer::dequeue(void *dst) {
// Shrink if possible.
if (_buffer_sz > _initial_sz && _unread <= _buffer_sz / 4) {
size_t new_buffer_sz = _buffer_sz >> 1;
I(dom, _initial_sz <= new_buffer_sz);
dom->log(rust_log::MEM | rust_log::COMM,
"circular_buffer is shrinking to %d bytes", _buffer_sz / 2);
void *tmp = dom->malloc(_buffer_sz / 2);
"circular_buffer is shrinking to %d bytes", new_buffer_sz);
void *tmp = dom->malloc(new_buffer_sz);
transfer(tmp);
_buffer_sz >>= 1;
I(dom, _initial_sz <= _buffer_sz);
dom->free(_buffer);
_buffer = (uint8_t *)tmp;
_next = 0;
_buffer_sz = new_buffer_sz;
}
}