CSY/reowolf Changeset - 2c1fa43903ac · Centrum Wiskunde & Informatica (CWI)

Changeset - 2c1fa43903ac

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MH - 3 years ago 2022-04-04 21:44:55
contact@maxhenger.nl

Several unfinished attempts at introducing polling

4 files changed with 145 insertions and 2 deletions:

Cargo.toml

src/runtime2/mod.rs

src/runtime2/poll/mod.rs

117

src/runtime2/stdlib/internet.rs

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Cargo.toml

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 [package]
 name = "reowolf_rs"
 version = "1.2.0"
 authors = [
 	"Max Henger <henger@cwi.nl>",
 	"Christopher Esterhuyse <esterhuy@cwi.nl>",
 	"Hans-Dieter Hiep <hdh@cwi.nl>"
+]
 edition = "2021"
 [features]
 default=["internet"]
 internet=["libc"]
 [dependencies]
 # ffi
 libc = { version = "^0.2", optional = true }
 libc = { version = "^0.2", optional = true } # raw sockets
 mio = { version = "0.8", features = ["os-poll"] } # cross-platform IO notification queue
 # randomness
 rand = "0.8.4"
 rand_pcg = "0.3.1"
 [lib]
 crate-type = [
 	"rlib", # for use as a Rust dependency.
+]
@@ \ No newline at end of file @@

src/runtime2/mod.rs

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 mod store;
 mod runtime;
 mod component;
 mod communication;
 mod scheduler;
 mod poll;
 mod stdlib;
 #[cfg(test)] mod tests;
 pub use runtime::Runtime;
 pub(crate) use scheduler::SchedulerCtx;
 pub(crate) use communication::{
     PortId, PortKind, PortState,
     Message, ControlMessage, SyncMessage, DataMessage,
     SyncRoundDecision
 };
@@ \ No newline at end of file @@

src/runtime2/poll/mod.rs

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@@ new file 100644 @@
 use libc::{self, c_int};
 use std::{io, ptr, time};
 pub(crate) type FileDescriptor = c_int;
 pub(crate) trait AsFileDescriptor {
     fn as_file_descriptor(&self) -> FileDescriptor;
+}
 pub(crate) struct UserData(u64);
 #[inline]
 pub(crate) fn register_polling<F: AsFileDescriptor>(
     poller: &Poller, entity: F, user: UserData, read: bool, write: bool
 ) -> io::Result<()> {
     let file_descriptor = entity.as_file_descriptor();
     return poller.register(file_descriptor, user, read, write);
+}
 #[inline]
 pub(crate) fn unregister_polling<F: AsFileDescriptor>(
     poller: &Poller, entity: F
 ) -> io::Result<()> {
     let file_descriptor = entity.as_file_descriptor();
     return poller.unregister(file_descriptor);
+}
 #[cfg(unix)]
 pub(crate) struct Poller {
     handle: c_int,
     events: Vec<libc::epoll_event>
+}
 // All of this is gleaned from the `mio` crate.
 #[cfg(unix)]
 impl Poller {
     pub fn new(event_capacity: usize) -> io::Result<Self> {
         assert!(event_capacity < i32::MAX as usize); // because of argument to `epoll_wait`.
         let handle = syscall_result(unsafe{ libc::epoll_create1(libc::EPOLL_CLOEXEC) })?;
         return Ok(Self{
             handle,
             events: Vec::with_capacity(event_capacity),
         })
+    }
     fn register(&self, fd: FileDescriptor, user: UserData, read: bool, write: bool) -> io::Result<()> {
         let mut event = libc::epoll_event{
             events: Self::events_from_rw_flags(read, write),
             u64: user.0,
         };
         syscall_result(unsafe{
             libc::epoll_ctl(self.handle, libc::EPOLL_CTL_ADD, fd, &mut event)
         })?;
         return Ok(());
+    }
     fn unregister(&self, fd: FileDescriptor) -> io::Result<()> {
         syscall_result(unsafe{
             libc::epoll_ctl(self.handle, libc::EPOLL_CTL_DEL, fd, ptr::null_mut())
         })?;
         return Ok(());
+    }
     pub fn wait(&mut self, timeout: time::Duration) -> io::Result<()> {
         // See `mio` for the reason. Works around a linux bug
         #[cfg(target_pointer_width = "32")]
         const MAX_TIMEOUT: u128 = 1789569;
         #[cfg(not(target_pointer_width = "32"))]
         const MAX_TIMEOUT: u128 = c_int::MAX as u128;
         let mut timeout_millis = timeout.as_millis();
         if timeout_millis > MAX_TIMEOUT {
             timeout_millis = -1; // effectively infinite
+        }
         let num_events = syscall_result(unsafe{
             libc::epoll_wait(self.handle, self.events.as_mut(), self.events.capacity() as i32, timeout_millis)
         })?;
         unsafe{
             debug_assert!(num_events >= 0);
             self.events.set_len(num_events as usize);
+        }
         return Ok(());
+    }
     fn events_from_rw_flags(read: bool, write: bool) -> u32 {
         let mut events = libc::EPOLLET;
         if read {
             events |= libc::EPOLLIN | libc::EPOLLRDHUP;
+        }
         if write {
             events |= libc::EPOLLOUT;
+        }
         return events as u32;
+    }
+}
 #[inline]
 fn syscall_result(result: c_int) -> io::Result<c_int> {
     if result < 0 {
         return Err(io::Error::last_os_error());
     } else {
         return Ok(result);
+    }
+}
 #[cfg(not(unix))]
 struct Poller {
+}
@@ \ No newline at end of file @@

src/runtime2/stdlib/internet.rs

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 use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
 use std::mem::size_of;
 use libc::{
     c_int,
     sockaddr_in, sockaddr_in6, in_addr, in6_addr,
     socket, bind, listen, accept, connect, close,
 };
 use mio::{event, Interest, Registry, Token};
 #[derive(Debug)]
 pub enum SocketError {
     Opening,
     Modifying,
     Binding,
     Listening,
     Connecting,
     Accepted,
     Accepting,
+}
 enum SocketState {
     Opened,
     Listening,
+}
 /// TCP connection
 pub struct SocketTcpClient {
     socket_handle: libc::c_int,
     is_blocking: bool,
+}
 impl SocketTcpClient {
     pub fn new(ip: IpAddr, port: u16) -> Result<Self, SocketError> {
         const BLOCKING: bool = false;
         let socket_handle = create_and_connect_socket(
             libc::SOCK_STREAM, libc::IPPROTO_TCP, ip, port
         )?;
         if !set_socket_blocking(socket_handle, BLOCKING) {
             unsafe{ libc::close(socket_handle); }
             return Err(SocketError::Modifying);
+        }
         return Ok(SocketTcpClient{
             socket_handle,
             is_blocking: BLOCKING,
         })
+    }
     pub fn send(&self, message: &[u8]) -> Result<usize, ()> {
         let result = unsafe{
             let message_pointer = message.as_ptr().cast();
             libc::send(self.socket_handle, message_pointer, message.len() as libc::size_t, 0)
         };
         if result < 0 {
             return Err(())
+        }
         return Ok(result as usize);
+    }
     /// Receives data from the TCP socket. Returns the number of bytes received.
     /// More bytes may be present even thought `used < buffer.len()`.
     pub fn receive(&self, buffer: &mut [u8]) -> Result<usize, ()> {
         if self.is_blocking {
             return self.receive_blocking(buffer);
         } else {
             return self.receive_nonblocking(buffer);
+        }
+    }
     #[inline]
     fn receive_blocking(&self, buffer: &mut [u8]) -> Result<usize, ()> {
         let result = unsafe {
             let message_pointer = buffer.as_mut_ptr().cast();
             libc::recv(self.socket_handle, message_pointer, buffer.len(), 0)
         };
         if result < 0 {
             return Err(());
+        }
         return Ok(result as usize);
+    }
     #[inline]
     fn receive_nonblocking(&self, buffer: &mut [u8]) -> Result<usize, ()> {
         unsafe {
             let mut message_pointer = buffer.as_mut_ptr().cast();
             let mut remaining = buffer.len();
             loop {
                 // Receive more data
                 let result = libc::recv(self.socket_handle, message_pointer, remaining, 0);
                 if result < 0 {
                     // Check reason
                     let errno = std::io::Error::last_os_error().raw_os_error().expect("os error after failed recv");
                     if errno == libc::EWOULDBLOCK || errno == libc::EAGAIN {
                         return Ok(buffer.len() - remaining);
                     } else {
                         return Err(());
+                    }
+                }
                 // Modify pointer and remaining bytes
                 let received = result as usize;
                 message_pointer = message_pointer.add(received);
                 remaining -= received;
                 if remaining == 0 {
                     return Ok(buffer.len());
+                }
+            }
+        }
+    }
+}
 impl Drop for SocketTcpClient {
     fn drop(&mut self) {
         debug_assert!(self.socket_handle >= 0);
         unsafe{ close(self.socket_handle) };
+    }
+}
 /// Raw socket receiver. Essentially a listener that accepts a single connection
 struct SocketRawRx {
     listen_handle: c_int,
     accepted_handle: c_int,
+}
 impl SocketRawRx {
     pub fn new(ip: Option<Ipv4Addr>, port: u16) -> Result<Self, SocketError> {
         let ip = ip.unwrap_or(Ipv4Addr::UNSPECIFIED); // unspecified is the same as INADDR_ANY
         let address = unsafe{ in_addr{
             s_addr: std::mem::transmute(ip.octets()),
         }};
         let socket_address = sockaddr_in{
             sin_family: libc::AF_INET as libc::sa_family_t,
             sin_port: htons(port),
             sin_addr: address,
             sin_zero: [0; 8],
         };
         unsafe {
             let socket_handle = create_and_bind_socket(libc::SOCK_RAW, 0, IpAddr::V4(ip), port)?;
             let result = listen(socket_handle, 3);
             if result < 0 { return Err(SocketError::Listening); }
             return Ok(SocketRawRx{
                 listen_handle: socket_handle,
                 accepted_handle: -1,
             });
+        }
+    }
     // pub fn try_accept(&mut self, timeout_ms: u32) -> Result<(), SocketError> {
     //     if self.accepted_handle >= 0 {
     //         // Already accepted a connection
     //         return Err(SocketError::Accepted);
     //     }
     //
     //     let mut socket_address = sockaddr_in{
     //         sin_family: 0,
     //         sin_port: 0,
     //         sin_addr: in_addr{ s_addr: 0 },
     //         sin_zero: [0; 8]
     //     };
     //     let mut size = size_of::<sockaddr_in>() as u32;
     //     unsafe {
     //         let result = accept(self.listen_handle, &mut socket_address as *mut _, &mut size as *mut _);
     //         if result < 0 {
     //             return Err(SocketError::Accepting);
     //         }
     //     }
     //
     //     return Ok(());
     // }
+}
 impl Drop for SocketRawRx {
     fn drop(&mut self) {
         if self.accepted_handle >= 0 {
             unsafe {
                 close(self.accepted_handle);
+            }
+        }
         if self.listen_handle >= 0 {
             unsafe {
                 close(self.listen_handle);
+            }
+        }
+    }
+}
 // The following is essentially stolen from `mio`'s io_source.rs file.
 #[cfg(unix)]
 trait AsRawFileDescriptor {
     fn as_raw_file_descriptor(&self) -> c_int;
+}
 impl AsRawFileDescriptor for SocketTcpClient {
     fn as_raw_file_descriptor(&self) -> c_int {
         return self.socket_handle;
+    }
+}
 impl<T: AsRawFileDescriptor> event::Source for T {
     fn register(&mut self, registry: &Registry, token: Token, interests: Interest) -> std::io::Result<()> {
         registry.selector().register()
+    }
     fn reregister(&mut self, registry: &Registry, token: Token, interests: Interest) -> std::io::Result<()> {
         todo!()
+    }
     fn deregister(&mut self, registry: &Registry) -> std::io::Result<()> {
         todo!()
+    }
+}
 /// Performs the `socket` and `bind` calls.
 fn create_and_bind_socket(socket_type: libc::c_int, protocol: libc::c_int, ip: IpAddr, port: u16) -> Result<libc::c_int, SocketError> {
     let family = socket_family_from_ip(ip);
     unsafe {
         let socket_handle = socket(family, socket_type, protocol);
         if socket_handle < 0 {
             return Err(SocketError::Opening);
+        }
         let result = match ip {
             IpAddr::V4(ip) => {
                 let (socket_address, address_size) = create_sockaddr_in_v4(ip, port);
                 let socket_pointer = &socket_address as *const sockaddr_in;
                 bind(socket_handle, socket_pointer.cast(), address_size)
             },
             IpAddr::V6(ip) => {
                 let (socket_address, address_size) = create_sockaddr_in_v6(ip, port);
                 let socket_pointer= &socket_address as *const sockaddr_in6;
                 bind(socket_handle, socket_pointer.cast(), address_size)
+            }
         };
         if result < 0 {
             close(socket_handle);
             return Err(SocketError::Binding);
+        }
         return Ok(socket_handle);
+    }
+}
 /// Performs the `socket` and `connect` calls
 fn create_and_connect_socket(socket_type: libc::c_int, protocol: libc::c_int, ip: IpAddr, port: u16) -> Result<libc::c_int, SocketError> {
     let family = socket_family_from_ip(ip);
     unsafe {
         let socket_handle = socket(family, socket_type, protocol);
         if socket_handle < 0 {
             return Err(SocketError::Opening);
+        }
         let result = match ip {
             IpAddr::V4(ip) => {
                 let (socket_address, address_size) = create_sockaddr_in_v4(ip, port);
                 let socket_pointer = &socket_address as *const sockaddr_in;
                 connect(socket_handle, socket_pointer.cast(), address_size)
             },
             IpAddr::V6(ip) => {
                 let (socket_address, address_size) = create_sockaddr_in_v6(ip, port);
                 let socket_pointer= &socket_address as *const sockaddr_in6;
                 connect(socket_handle, socket_pointer.cast(), address_size)
+            }
         };
         if result < 0 {
             close(socket_handle);
             return Err(SocketError::Connecting);
+        }
         return Ok(socket_handle);
+    }
+}
 #[inline]
 fn create_sockaddr_in_v4(ip: Ipv4Addr, port: u16) -> (sockaddr_in, libc::socklen_t) {
     let address = unsafe{
         in_addr{
             s_addr: std::mem::transmute(ip.octets())
+        }
     };
     let socket_address = sockaddr_in{
         sin_family: libc::AF_INET as libc::sa_family_t,
         sin_port: htons(port),
         sin_addr: address,
         sin_zero: [0; 8]
     };
     let address_size = size_of::<sockaddr_in>();
     return (socket_address, address_size as _);
+}
 #[inline]
 fn create_sockaddr_in_v6(ip: Ipv6Addr, port: u16) -> (sockaddr_in6, libc::socklen_t) {
     // flow label is advised to be, according to RFC6437 a (somewhat
     // secure) random number taken from a uniform distribution
     let flow_info = rand::random();
     let address = unsafe{
         in6_addr{
             s6_addr: ip.octets()
+        }
     };
     let socket_address = sockaddr_in6{
         sin6_family: libc::AF_INET6 as libc::sa_family_t,
         sin6_port: htons(port),

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