private static SubmissionQueue MapSq(int ringFd, size_t sqSize, io_uring_params *p, out UnmapHandle sqHandle, out UnmapHandle sqeHandle)
{
var ptr = mmap(NULL, sqSize, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, ringFd, (long)IORING_OFF_SQ_RING);
if (ptr == MAP_FAILED)
{
ThrowErrnoException();
}
sqHandle = new UnmapHandle(ptr, sqSize);
size_t sqeSize = SqeSize(p);
var sqePtr = mmap(NULL, sqeSize, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, ringFd, (long)IORING_OFF_SQES);
if (sqePtr == MAP_FAILED)
{
ThrowErrnoException();
}
sqeHandle = new UnmapHandle(sqePtr, sqeSize);
return(SubmissionQueue.CreateSubmissionQueue(ptr, &p->sq_off, (io_uring_sqe *)sqePtr));
}
private static CompletionQueue MapCq(int ringFd, size_t cqSize, io_uring_params *p, UnmapHandle sqHandle, out UnmapHandle cqHandle)
{
void *ptr;
if ((p->features & IORING_FEAT_SINGLE_MMAP) != 0)
{
ptr = sqHandle.DangerousGetHandle().ToPointer();
cqHandle = sqHandle;
}
else
{
ptr = mmap(NULL, cqSize, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, ringFd, (long)IORING_OFF_CQ_RING);
if (ptr == MAP_FAILED)
{
ThrowErrnoException();
}
cqHandle = new UnmapHandle(ptr, cqSize);
}
return(CompletionQueue.CreateCompletionQueue(ptr, &p->cq_off));
}
