mirror of https://github.com/FOME-Tech/fome-fw.git
62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
#include "pch.h"
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#include "big_buffer.h"
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static BigBufferUser s_currentUser;
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// this buffer requires 4 byte alignment
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// Some users place C++ objects in this memory, and that has certain alignment
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// requirements.
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static __attribute__((aligned(4))) uint8_t s_bigBuffer[BIG_BUFFER_SIZE];
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static void releaseBuffer(void* bufferPtr, BigBufferUser user) {
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if (bufferPtr != &s_bigBuffer || user != s_currentUser) {
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// todo: panic!
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}
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s_currentUser = BigBufferUser::None;
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}
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BigBufferHandle::BigBufferHandle(void* buffer, BigBufferUser user)
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: m_bufferPtr(buffer)
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, m_user(user)
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{
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}
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BigBufferHandle::BigBufferHandle(BigBufferHandle&& other) {
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// swap contents of the two objects
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m_bufferPtr = other.m_bufferPtr;
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other.m_bufferPtr = nullptr;
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m_user = other.m_user;
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other.m_user = BigBufferUser::None;
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}
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BigBufferHandle& BigBufferHandle::operator= (BigBufferHandle&& other) {
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// swap contents of the two objects
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m_bufferPtr = other.m_bufferPtr;
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other.m_bufferPtr = nullptr;
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m_user = other.m_user;
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other.m_user = BigBufferUser::None;
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return *this;
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}
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BigBufferHandle::~BigBufferHandle() {
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if (m_bufferPtr) {
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releaseBuffer(m_bufferPtr, m_user);
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}
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}
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BigBufferHandle getBigBuffer(BigBufferUser user) {
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if (s_currentUser != BigBufferUser::None) {
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// fatal
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return {};
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}
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s_currentUser = user;
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return BigBufferHandle(s_bigBuffer, user);
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}
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