61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
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/*
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* Copyright 2022 Haiku, Inc. All rights reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _MEMORY_RING_IO_H
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#define _MEMORY_RING_IO_H
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#include <pthread.h>
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#include <DataIO.h>
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#include <Locker.h>
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class BMemoryRingIO : public BDataIO {
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public:
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BMemoryRingIO(size_t size);
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virtual ~BMemoryRingIO();
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status_t InitCheck() const;
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virtual ssize_t Read(void* buffer, size_t size);
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virtual ssize_t Write(const void* buffer, size_t size);
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status_t SetSize(size_t size);
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void Clear();
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size_t BytesAvailable();
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size_t SpaceAvailable();
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size_t BufferSize();
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status_t WaitForRead(
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bigtime_t timeout = B_INFINITE_TIMEOUT);
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status_t WaitForWrite(
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bigtime_t timeout = B_INFINITE_TIMEOUT);
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void SetWriteDisabled(bool disabled);
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bool WriteDisabled();
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private:
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template<typename Condition>
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status_t _WaitForCondition(bigtime_t timeout);
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private:
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pthread_mutex_t fLock;
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pthread_cond_t fEvent;
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uint8* fBuffer;
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size_t fBufferSize;
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size_t fWriteAtNext;
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size_t fReadAtNext;
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bool fBufferFull;
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bool fWriteDisabled;
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uint32 _reserved[4];
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};
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#endif // _MEMORY_RING_IO_H
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