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C++ MemoryContext类代码示例

本文整理汇总了C++中MemoryContext类的典型用法代码示例。如果您正苦于以下问题：C++ MemoryContext类的具体用法？C++ MemoryContext怎么用？C++ MemoryContext使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。


在下文中一共展示了MemoryContext类的10个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: map

IO::Result IO::map(Address phys, Size size, Memory::Access access)
{
    m_range.virt   = 0;
    m_range.phys   = phys;
    m_range.access = access;
    m_range.size   = size;

    if (!isKernel)
    {
        if (VMCtl(SELF, Map, &m_range) != API::Success)
            return MapFailure;
    }
    else
    {
        m_range.access &= ~Memory::User;

        MemoryContext *ctx = MemoryContext::getCurrent();
        if (!ctx)
            return MapFailure;

        if (ctx->findFree(size, MemoryMap::KernelPrivate, &m_range.virt) != MemoryContext::Success)
            return OutOfMemory;

        if (ctx->map(m_range.virt, phys, m_range.access) != MemoryContext::Success)
            return MapFailure;
    }
    m_base = m_range.virt;
    return Success;
}
开发者ID:0xbda2d2f8，项目名称:FreeNOS，代码行数:29，代码来源:IO.cpp

示例2: FATAL

Kernel::Result Kernel::loadBootProcess(BootImage *image, Address imagePAddr, Size index)
{
    Address imageVAddr = (Address) image, args;
    Size args_size = ARGV_SIZE;
    BootSymbol *program;
    BootSegment *segment;
    Process *proc;
    char *vaddr;
    Arch::MemoryMap map;

    // Point to the program and segments table
    program = &((BootSymbol *) (imageVAddr + image->symbolTableOffset))[index];
    segment = &((BootSegment *) (imageVAddr + image->segmentsTableOffset))[program->segmentsOffset];

    // Ignore non-BootProgram entries
    if (program->type != BootProgram)
        return InvalidBootImage;

    // Create process
    proc = m_procs->create(program->entry, map);
    if (!proc)
    {
        FATAL("failed to create boot program: " << program->name);
        return ProcessError;
    }

    proc->setState(Process::Ready);

    // Obtain process memory
    MemoryContext *mem = proc->getMemoryContext();

    // Map program segment into it's virtual memory
    for (Size i = 0; i < program->segmentsCount; i++)
    {
        for (Size j = 0; j < segment[i].size; j += PAGESIZE)
        {
            mem->map(segment[i].virtualAddress + j,
                     imagePAddr + segment[i].offset + j,
                     Memory::User     |
                     Memory::Readable |
                     Memory::Writable |
                     Memory::Executable);
        }
    }
    
    // Map program arguments into the process
    // TODO: move into the high memory???
    m_alloc->allocateLow(args_size, &args);
    mem->map(ARGV_ADDR, args, Memory::User | Memory::Readable | Memory::Writable);

    // Copy program arguments
    vaddr = (char *) m_alloc->toVirtual(args);
    MemoryBlock::set(vaddr, 0, PAGESIZE);
    MemoryBlock::copy(vaddr, program->name, ARGV_SIZE);

    // Done
    NOTICE("loaded: " << program->name);
    return Success;
}
开发者ID:smilingcat12345，项目名称:FreeNOS，代码行数:59，代码来源:Kernel.cpp

示例3: writeRemoveLog

LsnType MRecords::writeRemoveLog(Session *session, LogType logType, TrxId txnId, LsnType preLsn, RowId rid, RowId rollBackId, u8 tableIndex) {
	LsnType lsn = 0;
	MemoryContext *ctx = session->getMemoryContext();
	McSavepoint msp(ctx);
	size_t size = sizeof(txnId) + sizeof(preLsn) + sizeof(rid) + sizeof(rollBackId) + sizeof(tableIndex);
	byte *buf = (byte *)ctx->alloc(size);
	Stream s(buf, size);
	s.write(txnId);
	s.write(preLsn);
	s.writeRid(rid);
	s.writeRid(rollBackId);
	s.write(tableIndex);
	lsn = session->getTrans()->writeTNTLog(logType, (*m_tableDef)->m_id, buf, s.getSize());
	return lsn;
}
开发者ID:github188，项目名称:mysql-5.5.30，代码行数:15，代码来源:MRecordsLog.cpp

示例4: InitializeMemoryContext

bool WindowsOperatingSystem::InitializeMemoryContext(MemoryContext& rMemCtxt) const
{
  // TODO: create a fake _TEB/_PEB
  if (rMemCtxt.AllocateMemory(0x7fdf0000, 0x1000, nullptr) == false)
    return false;
  return true;
}
开发者ID:episeclab，项目名称:medusa，代码行数:7，代码来源:windows.cpp

示例5: writeUpdateLog

LsnType MRecords::writeUpdateLog(Session *session, LogType logType, TrxId txnId, LsnType preLsn, RowId rid, RowId rollBackId, u8 tableIndex, SubRecord *update) {
	LsnType lsn = 0;
	MemoryContext *ctx = session->getMemoryContext();
	McSavepoint msp(ctx);
	size_t size = sizeof(txnId) + sizeof(preLsn) + sizeof(rid) + sizeof(rollBackId) + sizeof(tableIndex);
	size += RecordOper::getSubRecordSerializeSize(*m_tableDef, update, false);
	byte *buf = (byte *)ctx->alloc(size);
	Stream s(buf, size);
	s.write(txnId);
	s.write(preLsn);
	s.writeRid(rid);
	s.writeRid(rollBackId);
	s.write(tableIndex);
	RecordOper::serializeSubRecordMNR(&s, *m_tableDef, update, false);
	lsn = session->getTrans()->writeTNTLog(logType, (*m_tableDef)->m_id, buf, s.getSize());
	return lsn;
}
开发者ID:github188，项目名称:mysql-5.5.30，代码行数:17，代码来源:MRecordsLog.cpp

示例6: unmap

IO::Result IO::unmap()
{
    if (!isKernel)
    {
        if (VMCtl(SELF, UnMap, &m_range) != API::Success)
            return MapFailure;
    }
    else
    {
        MemoryContext *ctx = MemoryContext::getCurrent();
        if (!ctx)
            return MapFailure;

        if (ctx->unmapRange(&m_range) != MemoryContext::Success)
            return MapFailure;
    }
    return Success;
}
开发者ID:0xbda2d2f8，项目名称:FreeNOS，代码行数:18，代码来源:IO.cpp

示例7: 

template<> TIterator5<sc_type, sc_type, Addr, sc_type, sc_type>::TIterator5(MemoryContext const & context, sc_type const & p1, sc_type const & p2, Addr const & p3, sc_type const & p4, sc_type const & p5)
{
    mIterator = sc_iterator5_a_a_f_a_a_new(context.getRealContext(), p1, p2, p3.mRealAddr, p4, p5);
}
开发者ID:msifd，项目名称:sc-machine，代码行数:4，代码来源:sc_iterator.cpp

示例8: pool

void MemoryContextTestCase::testMemoryContextUsePool() {
	uint poolSize = 4096;
	uint reservedPages = 1;
	PagePool pool(1, NTSE_PAGE_SIZE);
	CommonMemPool commonMemPool(poolSize, &pool);
	pool.registerUser(&commonMemPool);
	pool.init();

	MemoryContext *mc = new MemoryContext(&commonMemPool, reservedPages);

	u64 firstSavepoint = mc->setSavepoint();

	int chunkSize = 700;
	void *first = mc->alloc(chunkSize);
	memset(first, 0, chunkSize);	// 便于valgrind检测有无越界写问题
	for (int i = 0; i < 12; i++) {
		void *chunk = mc->alloc(chunkSize);
		memset(chunk, 0, chunkSize);
	}
	u64 savepoint = mc->setSavepoint();
	void *firstAfterSavepoint = mc->alloc(chunkSize);
	for (int i = 0; i < 12; i++) {
		void *chunk = mc->alloc(chunkSize);
		memset(chunk, 0, chunkSize);
	}
	// 分配超出页面大小的块
	for (int i = 0; i < 3; i++)
		NTSE_ASSERT(NULL == mc->alloc(NTSE_PAGE_SIZE + 1));
	mc->resetToSavepoint(savepoint);
	CPPUNIT_ASSERT(mc->setSavepoint() == savepoint);
	CPPUNIT_ASSERT(mc->alloc(chunkSize) == firstAfterSavepoint);

	// 测试内存池内存不足
	mc->reset();
	for (int i = 0; i < poolSize; i++) {
		int cs = NTSE_PAGE_SIZE / 2 + 100;
		void *data = mc->alloc(cs);
		NTSE_ASSERT(NULL != data);
		memset(data, 0, cs);
	}

	NTSE_ASSERT(poolSize == commonMemPool.getCurrentSize());
	for (int i = 0; i < 10; i++) {
		int cs = NTSE_PAGE_SIZE / 2 + 100;
		void *data = mc->alloc(cs);
		NTSE_ASSERT(NULL == data);
		NTSE_ASSERT(poolSize == commonMemPool.getCurrentSize());
	}

	mc->reset();
	CPPUNIT_ASSERT(mc->setSavepoint() == firstSavepoint);
	CPPUNIT_ASSERT(mc->alloc(chunkSize) == first);	// 第一页始终保持因此地址不变
	mc->resetToSavepoint(0);
	CPPUNIT_ASSERT(mc->setSavepoint() == firstSavepoint);
	CPPUNIT_ASSERT(mc->alloc(chunkSize) == first);

	// 测试getMemUsage
	{
		mc->reset();
		for (int i = 0; i < 12; i++)
			mc->alloc(chunkSize);
		CPPUNIT_ASSERT(mc->getMemUsage() > chunkSize * 12);
		u64 muBak = mc->getMemUsage();
		u64 savepoint = mc->setSavepoint();
		for (int i = 0; i < 12; i++)
			mc->alloc(chunkSize);
		CPPUNIT_ASSERT(mc->getMemUsage() > chunkSize * 24);
		mc->resetToSavepoint(savepoint);
		CPPUNIT_ASSERT(mc->getMemUsage() == muBak);
		mc->reset();
		CPPUNIT_ASSERT(mc->getMemUsage() < muBak);
	}
	delete mc;
	mc = NULL;

	// 测试预留页面数
	for (uint i = 1; i <= 10; i++) {	
		mc = new MemoryContext(&commonMemPool, i);

		uint lastUsedPages = commonMemPool.getCurrentSize();
		
		for (uint j = 0; j < i; j++) {
			int cs = NTSE_PAGE_SIZE / 2 + 100;
			void *data = mc->alloc(cs);
			memset(data, 0, cs);
		}

		NTSE_ASSERT(lastUsedPages == commonMemPool.getCurrentSize());

		mc->reset();
		delete mc;
		mc = NULL;
	}
}
开发者ID:github188，项目名称:mysql-5.5.30，代码行数:94，代码来源:TestMemoryContext.cpp

示例9: MemoryContext

void MemoryContextTestCase::testMemoryContext() {
	MemoryContext *mc = new MemoryContext(4096, 1);

	CPPUNIT_ASSERT(mc->setSavepoint() == 0);
	int chunkSize = 700;
	for (int i = 0; i < 12; i++) {
		void *chunk = mc->alloc(chunkSize);
		memset(chunk, 0, chunkSize);
	}
	u64 savepoint = mc->setSavepoint();
	CPPUNIT_ASSERT(savepoint == 12);

	for (int i = 0; i < 12; i++) {
		void *chunk = mc->alloc(chunkSize);
		memset(chunk, 0, chunkSize);
	}

	mc->resetToSavepoint(savepoint);
	CPPUNIT_ASSERT(mc->setSavepoint() == savepoint);

	mc->reset();
	CPPUNIT_ASSERT(mc->setSavepoint() == 0);
	mc->alloc(chunkSize);
	mc->resetToSavepoint(0);
	CPPUNIT_ASSERT(mc->setSavepoint() == 0);

	// 测试getMemUsage
	{
		mc->reset();
		for (int i = 0; i < 12; i++)
			mc->alloc(chunkSize);
		CPPUNIT_ASSERT(mc->getMemUsage() == chunkSize * 12);
		u64 muBak = mc->getMemUsage();
		u64 savepoint = mc->setSavepoint();
		for (int i = 0; i < 12; i++)
			mc->alloc(chunkSize);
		CPPUNIT_ASSERT(mc->getMemUsage() == chunkSize * 24);
		mc->resetToSavepoint(savepoint);
		CPPUNIT_ASSERT(mc->getMemUsage() == muBak);
		mc->reset();
		CPPUNIT_ASSERT(mc->getMemUsage() == 0);
	}
	delete mc;
}
开发者ID:github188，项目名称:mysql-5.5.30，代码行数:44，代码来源:TestMemoryContext.cpp

示例10: VMCopyHandler

Error VMCopyHandler(ProcessID procID, API::Operation how, Address ours,
                    Address theirs, Size sz)
{
    ProcessManager *procs = Kernel::instance->getProcessManager();
    Process *proc;
    Address paddr, vaddr;
    Size bytes = 0, pageOff, total = 0;

    // Find the corresponding Process
    if (procID == SELF)
        proc = procs->current();
    else if (!(proc = procs->get(procID)))
        return API::NotFound;

    // TODO: Verify memory addresses
    MemoryContext *local  = procs->current()->getMemoryContext();
    MemoryContext *remote = proc->getMemoryContext();

    // Keep on going until all memory is processed
    while (total < sz)
    {
        /* Update variables. */
        if (how == API::ReadPhys)
            paddr = theirs & PAGEMASK;
        else if (remote->lookup(theirs, &paddr) != MemoryContext::Success)
            return API::AccessViolation;

        pageOff = theirs & ~PAGEMASK;
        bytes   = (PAGESIZE - pageOff) < (sz - total) ?
                  (PAGESIZE - pageOff) : (sz - total);
                
        /* Valid address? */
        if (!paddr) break;
                
        // Map their address into our local address space
        if (local->findFree(PAGESIZE, MemoryMap::KernelPrivate, &vaddr) != MemoryContext::Success)
            return API::RangeError;

        local->map(vaddr, paddr, Memory::Readable | Memory::Writable);

        /* Process the action appropriately. */
        switch (how)
        {
            case API::Read:
            case API::ReadPhys:
                MemoryBlock::copy((void *)ours, (void *)(vaddr + pageOff), bytes);
                break;
                        
            case API::Write:
                MemoryBlock::copy((void *)(vaddr + pageOff), (void *)ours, bytes);
                break;
            
            default:
                ;
        }       
        // Unmap
        local->unmap(vaddr);

        // Update counters
        ours   += bytes;
        theirs += bytes;
        total  += bytes;
    }
    return total;
}
开发者ID:leckie711，项目名称:FreeNOS，代码行数:65，代码来源:VMCopy.cpp


注：本文中的MemoryContext类示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。