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30 lines
1008 B
C
30 lines
1008 B
C
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#pragma once
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#include <memory>
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#include <string>
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struct ScopedLock {
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virtual ~ScopedLock() = default;
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};
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// Points to a generic block of memory. Note that |data| is relocatable, ie,
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// multiple Buffer instantations may point to the same underlying block of
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// memory but the data pointer has different values.
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struct Buffer {
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// Create a new buffer of the given capacity using process-local memory.
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static std::unique_ptr<Buffer> Create(size_t capacity);
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// Create a buffer pointing to memory shared across processes with the given
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// capacity.
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static std::unique_ptr<Buffer> CreateSharedBuffer(const std::string& name,
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size_t capacity);
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virtual ~Buffer() = default;
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// Acquire a lock on the buffer, ie, become the only code that can read or
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// write to it. The lock lasts so long as the returned object is alive.
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virtual std::unique_ptr<ScopedLock> WaitForExclusiveAccess() = 0;
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void* data = nullptr;
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size_t capacity = 0;
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};
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