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Fix close_output test.

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This commit is contained in:
Eric Huss 2020-08-04 15:50:17 -07:00
parent 964a16a28e
commit 191250b910
1 changed files with 14 additions and 3 deletions
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17
tests/testsuite/build.rs
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@ -4975,11 +4975,22 @@ fn close_output() {
let mut buf = [0];
drop(socket.read_exact(&mut buf));
let use_stderr = std::env::var("__CARGO_REPRO_STDERR").is_ok();
for i in 0..10000 {
// Emit at least 1MB of data.
// Linux pipes can buffer up to 64KB.
// This test seems to be sensitive to having other threads
// calling fork. My hypothesis is that the stdout/stderr
// file descriptors are duplicated into the child process,
// and during the short window between fork and exec, the
// file descriptor is kept alive long enough for the
// build to finish. It's a half-baked theory, but this
// seems to prevent the spurious errors in CI.
// An alternative solution is to run this test in
// a single-threaded environment.
for i in 0..100000 {
if use_stderr {
eprintln!("{}", i);
eprintln!("0123456789{}", i);
} else {
println!("{}", i);
println!("0123456789{}", i);
}
}
TokenStream::new()