From 84a89ed3effb37c86ca686adbb447275f3562a09 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Fri, 10 Apr 2015 10:36:13 -0700
Subject: [PATCH] compiletest: Re-add raise_fd_limit

This apparently fixes obscure bugs on OSX!
---
 src/compiletest/compiletest.rs    |  9 +----
 src/compiletest/raise_fd_limit.rs | 67 +++++++++++++++++++++++++++++++
 src/compiletest/runtest.rs        |  7 +---
 3 files changed, 70 insertions(+), 13 deletions(-)
 create mode 100644 src/compiletest/raise_fd_limit.rs

diff --git a/src/compiletest/compiletest.rs b/src/compiletest/compiletest.rs
index e680be2a8c5..b93ab5d3134 100644
--- a/src/compiletest/compiletest.rs
+++ b/src/compiletest/compiletest.rs
@@ -12,9 +12,7 @@
 
 #![feature(box_syntax)]
 #![feature(collections)]
-#![feature(old_io)]
 #![feature(rustc_private)]
-#![feature(unboxed_closures)]
 #![feature(std_misc)]
 #![feature(test)]
 #![feature(path_ext)]
@@ -42,6 +40,7 @@ pub mod header;
 pub mod runtest;
 pub mod common;
 pub mod errors;
+mod raise_fd_limit;
 
 pub fn main() {
     let config = parse_config(env::args().collect());
@@ -245,11 +244,7 @@ pub fn run_tests(config: &Config) {
     // sadly osx needs some file descriptor limits raised for running tests in
     // parallel (especially when we have lots and lots of child processes).
     // For context, see #8904
-    #[allow(deprecated)]
-    fn raise_fd_limit() {
-        std::old_io::test::raise_fd_limit();
-    }
-    raise_fd_limit();
+    raise_fd_limit::raise_fd_limit();
     // Prevent issue #21352 UAC blocking .exe containing 'patch' etc. on Windows
     // If #11207 is resolved (adding manifest to .exe) this becomes unnecessary
     env::set_var("__COMPAT_LAYER", "RunAsInvoker");
diff --git a/src/compiletest/raise_fd_limit.rs b/src/compiletest/raise_fd_limit.rs
new file mode 100644
index 00000000000..bf252fa0e74
--- /dev/null
+++ b/src/compiletest/raise_fd_limit.rs
@@ -0,0 +1,67 @@
+/// darwin_fd_limit exists to work around an issue where launchctl on Mac OS X
+/// defaults the rlimit maxfiles to 256/unlimited. The default soft limit of 256
+/// ends up being far too low for our multithreaded scheduler testing, depending
+/// on the number of cores available.
+///
+/// This fixes issue #7772.
+#[cfg(any(target_os = "macos", target_os = "ios"))]
+#[allow(non_camel_case_types)]
+pub fn raise_fd_limit() {
+    use libc;
+
+    type rlim_t = libc::uint64_t;
+    #[repr(C)]
+    struct rlimit {
+        rlim_cur: rlim_t,
+        rlim_max: rlim_t
+    }
+    extern {
+        // name probably doesn't need to be mut, but the C function doesn't
+        // specify const
+        fn sysctl(name: *mut libc::c_int, namelen: libc::c_uint,
+                  oldp: *mut libc::c_void, oldlenp: *mut libc::size_t,
+                  newp: *mut libc::c_void, newlen: libc::size_t) -> libc::c_int;
+        fn getrlimit(resource: libc::c_int, rlp: *mut rlimit) -> libc::c_int;
+        fn setrlimit(resource: libc::c_int, rlp: *const rlimit) -> libc::c_int;
+    }
+    static CTL_KERN: libc::c_int = 1;
+    static KERN_MAXFILESPERPROC: libc::c_int = 29;
+    static RLIMIT_NOFILE: libc::c_int = 8;
+
+    // The strategy here is to fetch the current resource limits, read the
+    // kern.maxfilesperproc sysctl value, and bump the soft resource limit for
+    // maxfiles up to the sysctl value.
+    use ptr::null_mut;
+    use mem::size_of_val;
+    use io;
+
+    // Fetch the kern.maxfilesperproc value
+    let mut mib: [libc::c_int; 2] = [CTL_KERN, KERN_MAXFILESPERPROC];
+    let mut maxfiles: libc::c_int = 0;
+    let mut size: libc::size_t = size_of_val(&maxfiles) as libc::size_t;
+    if sysctl(&mut mib[0], 2, &mut maxfiles as *mut _ as *mut _, &mut size,
+              null_mut(), 0) != 0 {
+        let err = io::Error::last_os_error();
+        panic!("raise_fd_limit: error calling sysctl: {}", err);
+    }
+
+    // Fetch the current resource limits
+    let mut rlim = rlimit{rlim_cur: 0, rlim_max: 0};
+    if getrlimit(RLIMIT_NOFILE, &mut rlim) != 0 {
+        let err = io::Error::last_os_error();
+        panic!("raise_fd_limit: error calling getrlimit: {}", err);
+    }
+
+    // Bump the soft limit to the smaller of kern.maxfilesperproc and the hard
+    // limit
+    rlim.rlim_cur = ::cmp::min(maxfiles as rlim_t, rlim.rlim_max);
+
+    // Set our newly-increased resource limit
+    if setrlimit(RLIMIT_NOFILE, &rlim) != 0 {
+        let err = io::Error::last_os_error();
+        panic!("raise_fd_limit: error calling setrlimit: {}", err);
+    }
+}
+
+#[cfg(not(any(target_os = "macos", target_os = "ios")))]
+pub fn raise_fd_limit() {}
diff --git a/src/compiletest/runtest.rs b/src/compiletest/runtest.rs
index daa53e2dbd5..55f15867532 100644
--- a/src/compiletest/runtest.rs
+++ b/src/compiletest/runtest.rs
@@ -29,7 +29,6 @@ use std::net::TcpStream;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Output, ExitStatus};
 use std::str;
-use std::time::Duration;
 use test::MetricMap;
 
 pub fn run(config: Config, testfile: &Path) {
@@ -452,11 +451,7 @@ fn run_debuginfo_gdb_test(config: &Config, props: &TestProps, testfile: &Path) {
                 .expect(&format!("failed to exec `{:?}`", config.adb_path));
             loop {
                 //waiting 1 second for gdbserver start
-                #[allow(deprecated)]
-                fn sleep() {
-                    ::std::old_io::timer::sleep(Duration::milliseconds(1000));
-                }
-                sleep();
+                ::std::thread::sleep_ms(1000);
                 if TcpStream::connect("127.0.0.1:5039").is_ok() {
                     break
                 }