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Add internal locking to DoubleBuffer.
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commit
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2 changed files with 16 additions and 2 deletions
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@ -2,6 +2,7 @@
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#include <AK/Types.h>
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#include <AK/Vector.h>
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#include <AK/Lock.h>
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class DoubleBuffer {
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public:
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@ -14,16 +15,20 @@ public:
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ssize_t write(const byte*, size_t);
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ssize_t read(byte*, size_t);
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bool is_empty() const { return m_read_buffer_index >= m_read_buffer->size() && m_write_buffer->is_empty(); }
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bool is_empty() const { return m_empty; }
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// FIXME: Isn't this racy? What if we get interrupted between getting the buffer pointer and dereferencing it?
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size_t bytes_in_write_buffer() const { return m_write_buffer->size(); }
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private:
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void flip();
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void compute_emptiness();
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Vector<byte>* m_write_buffer { nullptr };
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Vector<byte>* m_read_buffer { nullptr };
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Vector<byte> m_buffer1;
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Vector<byte> m_buffer2;
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size_t m_read_buffer_index { 0 };
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bool m_empty { true };
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SpinLock m_lock;
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};
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