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Auto merge of rust-lang#3815 - RalfJung:pipe, r=RalfJung
implement pipe and pipe2 Fixes rust-lang/miri#3746
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| //@ignore-target-windows: No libc pipe on Windows | ||
| // test_race depends on a deterministic schedule. | ||
| //@compile-flags: -Zmiri-preemption-rate=0 | ||
| use std::thread; | ||
| fn main() { | ||
| test_pipe(); | ||
| test_pipe_threaded(); | ||
| test_race(); | ||
| } | ||
|
|
||
| fn test_pipe() { | ||
| let mut fds = [-1, -1]; | ||
| let res = unsafe { libc::pipe(fds.as_mut_ptr()) }; | ||
| assert_eq!(res, 0); | ||
|
|
||
| // Read size == data available in buffer. | ||
| let data = "12345".as_bytes().as_ptr(); | ||
| let res = unsafe { libc::write(fds[1], data as *const libc::c_void, 5) }; | ||
| assert_eq!(res, 5); | ||
| let mut buf3: [u8; 5] = [0; 5]; | ||
| let res = unsafe { libc::read(fds[0], buf3.as_mut_ptr().cast(), buf3.len() as libc::size_t) }; | ||
| assert_eq!(res, 5); | ||
| assert_eq!(buf3, "12345".as_bytes()); | ||
|
|
||
| // Read size > data available in buffer. | ||
| let data = "123".as_bytes().as_ptr(); | ||
| let res = unsafe { libc::write(fds[1], data as *const libc::c_void, 3) }; | ||
| assert_eq!(res, 3); | ||
| let mut buf4: [u8; 5] = [0; 5]; | ||
| let res = unsafe { libc::read(fds[0], buf4.as_mut_ptr().cast(), buf4.len() as libc::size_t) }; | ||
| assert_eq!(res, 3); | ||
| assert_eq!(&buf4[0..3], "123".as_bytes()); | ||
| } | ||
|
|
||
| fn test_pipe_threaded() { | ||
| let mut fds = [-1, -1]; | ||
| let res = unsafe { libc::pipe(fds.as_mut_ptr()) }; | ||
| assert_eq!(res, 0); | ||
|
|
||
| let thread1 = thread::spawn(move || { | ||
| let mut buf: [u8; 5] = [0; 5]; | ||
| let res: i64 = unsafe { | ||
| libc::read(fds[0], buf.as_mut_ptr().cast(), buf.len() as libc::size_t) | ||
| .try_into() | ||
| .unwrap() | ||
| }; | ||
| assert_eq!(res, 5); | ||
| assert_eq!(buf, "abcde".as_bytes()); | ||
| }); | ||
| // FIXME: we should yield here once blocking is implemented. | ||
| //thread::yield_now(); | ||
| let data = "abcde".as_bytes().as_ptr(); | ||
| let res = unsafe { libc::write(fds[1], data as *const libc::c_void, 5) }; | ||
| assert_eq!(res, 5); | ||
| thread1.join().unwrap(); | ||
|
|
||
| // Read and write from different direction | ||
| let thread2 = thread::spawn(move || { | ||
| // FIXME: we should yield here once blocking is implemented. | ||
| //thread::yield_now(); | ||
| let data = "12345".as_bytes().as_ptr(); | ||
| let res = unsafe { libc::write(fds[1], data as *const libc::c_void, 5) }; | ||
| assert_eq!(res, 5); | ||
| }); | ||
| // FIXME: we should not yield here once blocking is implemented. | ||
| thread::yield_now(); | ||
| let mut buf: [u8; 5] = [0; 5]; | ||
| let res = unsafe { libc::read(fds[0], buf.as_mut_ptr().cast(), buf.len() as libc::size_t) }; | ||
| assert_eq!(res, 5); | ||
| assert_eq!(buf, "12345".as_bytes()); | ||
| thread2.join().unwrap(); | ||
| } | ||
|
|
||
| fn test_race() { | ||
| static mut VAL: u8 = 0; | ||
| let mut fds = [-1, -1]; | ||
| let res = unsafe { libc::pipe(fds.as_mut_ptr()) }; | ||
| assert_eq!(res, 0); | ||
| let thread1 = thread::spawn(move || { | ||
| let mut buf: [u8; 1] = [0; 1]; | ||
| // write() from the main thread will occur before the read() here | ||
| // because preemption is disabled and the main thread yields after write(). | ||
| let res: i32 = unsafe { | ||
| libc::read(fds[0], buf.as_mut_ptr().cast(), buf.len() as libc::size_t) | ||
| .try_into() | ||
| .unwrap() | ||
| }; | ||
| assert_eq!(res, 1); | ||
| assert_eq!(buf, "a".as_bytes()); | ||
| // The read above establishes a happens-before so it is now safe to access this global variable. | ||
| unsafe { assert_eq!(VAL, 1) }; | ||
| }); | ||
| unsafe { VAL = 1 }; | ||
| let data = "a".as_bytes().as_ptr(); | ||
| let res = unsafe { libc::write(fds[1], data as *const libc::c_void, 1) }; | ||
| assert_eq!(res, 1); | ||
| thread::yield_now(); | ||
| thread1.join().unwrap(); | ||
| } |
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