1. Implement type-safe functions;
2. Improve the correctness of nearly all the functions;
3. Improve the readability by introducing Listener and Endpoint for StreamUnix;
4. Substitue RingBuf with Channel in Unix socket.
This bugfix ensures that when an object of Producer/Consumer for
channels is dropped, its shutdown method is called automatically. This ensures
that the peer of a Producer/Consumer gets notified and won't wait indefinitely.
The current Tcmalloc has memory leak issue. So change it as optional. By
default, dlmalloc is used. Enable tcmalloc with below command:
make TCMALLOC=Y
Due to the incomplete implementation of SGX simulation mode, Occlum gRPC demo keeps failing in CI.
Since this is also tested in SGX hardware mode, just ignore the result in simulation mode for now.
This commit can be reverted once the SGX simulation mode is flawless.
Usually, files are unregistered from an epoll file via the EPOLL_CTL_DEL command
explicitly. But for the sake of users' convenience, Linux supports
unregistering a file automatically from the epoll files that monitor the file
when the file is closed. This commit adds this capability.
When using the optimized string lib in Occlum, the memset function would
use xmm0 register, as the result, the FP area initialization code would
modify the FP area before saving it. So just ignor the FP area
initialization code.
1. >> has higher precedence than &. Use parentheses to conduct & first;
2. In the latest Intel software developer's manual, cpuid leaf 06H EDX
is related to the logical processor.
Before this commit, the epoll implementation works by simply delegating to the
host OS through OCall. One major problem with this implementation is
that it can only handle files that are backed by a file of the host OS
(e.g., sockets), but not those are are mainly implemented by the LibOS
(e.g., pipes). Therefore, a new epoll implementation that can handle all
kinds of files is needed.
This commit completely rewrites the epoll implementation by leveraging
the new event subsystem. Now the new epoll can handle all file types:
1. Host files, e.g., sockets, eventfd;
2. LibOS files, e.g., pipes;
3. Hybrid files, e.g., epoll files.
For a new file type to support epoll, it only neends to implement no
more than four methods of the File trait:
* poll (required for all file types);
* notifier (required for all file files);
* host_fd (only required for host files);
* recv_host_events (only required for host files).
