bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Rollup merge of #50726 - udoprog:read2-inner-fn, r=alexcrichton

Browse source 
read2: Use inner function instead of closure

Very minor thing, but there doesn't appear to be a reason to use a closure here.

Generated code is identical in my tests, but I believe it's clearer that nothing from the environment is being used.
This commit is contained in:
kennytm 2018-05-16 23:22:52 +08:00
commit fc6c08e799
No known key found for this signature in database
GPG key ID: FEF6C8051D0E013C
1 changed files with 19 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

21
src/libstd/sys/unix/pipe.rs
View file

@ -100,12 +100,22 @@ pub fn read2(p1: AnonPipe,
// wait for either pipe to become readable using `poll`
cvt_r(|| unsafe { libc::poll(fds.as_mut_ptr(), 2, -1) })?;
if fds[0].revents != 0 && read(&p1, v1)? {
p2.set_nonblocking(false)?;
return p2.read_to_end(v2).map(|_| ());
}
if fds[1].revents != 0 && read(&p2, v2)? {
p1.set_nonblocking(false)?;
return p1.read_to_end(v1).map(|_| ());
}
}
// Read as much as we can from each pipe, ignoring EWOULDBLOCK or
// EAGAIN. If we hit EOF, then this will happen because the underlying
// reader will return Ok(0), in which case we'll see `Ok` ourselves. In
// this case we flip the other fd back into blocking mode and read
// whatever's leftover on that file descriptor.
let read = |fd: &FileDesc, dst: &mut Vec<u8>| {
fn read(fd: &FileDesc, dst: &mut Vec<u8>) -> Result<bool, io::Error> {
match fd.read_to_end(dst) {
Ok(_) => Ok(true),
Err(e) => {
@ -117,14 +127,5 @@ pub fn read2(p1: AnonPipe,
}
}
}
};
if fds[0].revents != 0 && read(&p1, v1)? {
p2.set_nonblocking(false)?;
return p2.read_to_end(v2).map(|_| ());
}
if fds[1].revents != 0 && read(&p2, v2)? {
p1.set_nonblocking(false)?;
return p1.read_to_end(v1).map(|_| ());
}
}
}