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Kernel: DoubleBuffer can return early if read/write is called with !size.

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This commit is contained in:
Andreas Kling 2019-03-20 02:12:03 +01:00
parent 1c423f7691
commit a02c945ef2
1 changed files with 4 additions and 0 deletions
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4
Kernel/DoubleBuffer.cpp
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@ -19,6 +19,8 @@ void DoubleBuffer::flip()
ssize_t DoubleBuffer::write(const byte* data, ssize_t size) ssize_t DoubleBuffer::write(const byte* data, ssize_t size)
{ {
if (!size)
return 0;
LOCKER(m_lock); LOCKER(m_lock);
m_write_buffer->append(data, size); m_write_buffer->append(data, size);
compute_emptiness(); compute_emptiness();
@ -27,6 +29,8 @@ ssize_t DoubleBuffer::write(const byte* data, ssize_t size)
ssize_t DoubleBuffer::read(byte* data, ssize_t size) ssize_t DoubleBuffer::read(byte* data, ssize_t size)
{ {
if (!size)
return 0;
LOCKER(m_lock); LOCKER(m_lock);
if (m_read_buffer_index >= m_read_buffer->size() && !m_write_buffer->is_empty()) if (m_read_buffer_index >= m_read_buffer->size() && !m_write_buffer->is_empty())
flip(); flip();