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Add internal locking to DoubleBuffer.
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parent
e42f090ed3
commit
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2 changed files with 16 additions and 2 deletions
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@ -1,8 +1,12 @@
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#include "DoubleBuffer.h"
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inline void DoubleBuffer::compute_emptiness()
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{
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m_empty = m_read_buffer_index >= m_read_buffer->size() && m_write_buffer->is_empty();
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}
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void DoubleBuffer::flip()
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{
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InterruptDisabler disabler;
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ASSERT(m_read_buffer_index == m_read_buffer->size());
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swap(m_read_buffer, m_write_buffer);
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if (m_write_buffer->capacity() < 32)
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@ -10,16 +14,20 @@ void DoubleBuffer::flip()
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else
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m_write_buffer->clear();
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m_read_buffer_index = 0;
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compute_emptiness();
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}
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ssize_t DoubleBuffer::write(const byte* data, size_t size)
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{
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LOCKER(m_lock);
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m_write_buffer->append(data, size);
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compute_emptiness();
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return size;
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}
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ssize_t DoubleBuffer::read(byte* data, size_t size)
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{
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LOCKER(m_lock);
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if (m_read_buffer_index >= m_read_buffer->size() && !m_write_buffer->is_empty())
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flip();
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if (m_read_buffer_index >= m_read_buffer->size())
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@ -27,5 +35,6 @@ ssize_t DoubleBuffer::read(byte* data, size_t size)
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ssize_t nread = min(m_read_buffer->size() - m_read_buffer_index, size);
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memcpy(data, m_read_buffer->data() + m_read_buffer_index, nread);
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m_read_buffer_index += nread;
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compute_emptiness();
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return nread;
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}
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