本文整理汇总了C++中IOBuffer::GetNextVirtualVec方法的典型用法代码示例。如果您正苦于以下问题：C++ IOBuffer::GetNextVirtualVec方法的具体用法？C++ IOBuffer::GetNextVirtualVec怎么用？C++ IOBuffer::GetNextVirtualVec使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类IOBuffer的用法示例。
在下文中一共展示了IOBuffer::GetNextVirtualVec方法的2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: io
static status_t
do_synchronous_iterative_vnode_io(struct vnode* vnode, void* openCookie,
io_request* request, iterative_io_get_vecs getVecs,
iterative_io_finished finished, void* cookie)
{
IOBuffer* buffer = request->Buffer();
VnodeIO io(request->IsWrite(), vnode, openCookie);
iovec vector;
void* virtualVecCookie = NULL;
off_t offset = request->Offset();
generic_size_t length = request->Length();
status_t error = B_OK;
for (; error == B_OK && length > 0
&& buffer->GetNextVirtualVec(virtualVecCookie, vector) == B_OK;) {
uint8* vecBase = (uint8*)vector.iov_base;
generic_size_t vecLength = min_c(vector.iov_len, length);
while (error == B_OK && vecLength > 0) {
file_io_vec fileVecs[8];
size_t fileVecCount = 8;
error = getVecs(cookie, request, offset, vecLength, fileVecs,
&fileVecCount);
if (error != B_OK || fileVecCount == 0)
break;
for (size_t i = 0; i < fileVecCount; i++) {
const file_io_vec& fileVec = fileVecs[i];
size_t toTransfer = min_c(fileVec.length, (off_t)length);
size_t transferred = toTransfer;
error = io.IO(fileVec.offset, vecBase, &transferred);
if (error != B_OK)
break;
offset += transferred;
length -= transferred;
vecBase += transferred;
vecLength -= transferred;
if (transferred != toTransfer)
break;
}
}
}
buffer->FreeVirtualVecCookie(virtualVecCookie);
bool partial = length > 0;
size_t bytesTransferred = request->Length() - length;
request->SetTransferredBytes(partial, bytesTransferred);
finished(cookie, request, error, partial, bytesTransferred);
request->SetStatusAndNotify(error);
return error;
}示例2:
static status_t
synchronous_io(io_request* request, DoIO& io)
{
TRACE_RIO("[%" B_PRId32 "] synchronous_io(request: %p (offset: %" B_PRIdOFF
", length: %" B_PRIuGENADDR "))\n", find_thread(NULL), request,
request->Offset(), request->Length());
IOBuffer* buffer = request->Buffer();
iovec vector;
void* virtualVecCookie = NULL;
off_t offset = request->Offset();
generic_size_t length = request->Length();
for (; length > 0
&& buffer->GetNextVirtualVec(virtualVecCookie, vector) == B_OK;) {
void* vecBase = (void*)(addr_t)vector.iov_base;
size_t vecLength = min_c(vector.iov_len, length);
TRACE_RIO("[%ld] I/O: offset: %lld, vecBase: %p, length: %lu\n",
find_thread(NULL), offset, vecBase, vecLength);
size_t transferred = vecLength;
status_t error = io.IO(offset, vecBase, &transferred);
if (error != B_OK) {
TRACE_RIO("[%ld] I/O failed: %#lx\n", find_thread(NULL), error);
buffer->FreeVirtualVecCookie(virtualVecCookie);
request->SetStatusAndNotify(error);
return error;
}
offset += transferred;
length -= transferred;
if (transferred != vecLength)
break;
}
TRACE_RIO("[%ld] synchronous_io() succeeded\n", find_thread(NULL));
buffer->FreeVirtualVecCookie(virtualVecCookie);
request->SetTransferredBytes(length > 0, request->Length() - length);
request->SetStatusAndNotify(B_OK);
return B_OK;
}