78 lines
2.9 KiB
Rust
78 lines
2.9 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use io::prelude::*;
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use env;
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use fmt;
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use intrinsics;
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use libc::uintptr_t;
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use sync::atomic::{self, Ordering};
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use sys::stdio::Stderr;
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/// Dynamically inquire about whether we're running under V.
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/// You should usually not use this unless your test definitely
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/// can't run correctly un-altered. Valgrind is there to help
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/// you notice weirdness in normal, un-doctored code paths!
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pub fn running_on_valgrind() -> bool {
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extern {
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fn rust_running_on_valgrind() -> uintptr_t;
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}
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unsafe { rust_running_on_valgrind() != 0 }
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}
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/// Valgrind has a fixed-sized array (size around 2000) of segment descriptors
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/// wired into it; this is a hard limit and requires rebuilding valgrind if you
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/// want to go beyond it. Normally this is not a problem, but in some tests, we
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/// produce a lot of threads casually. Making lots of threads alone might not
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/// be a problem _either_, except on OSX, the segments produced for new threads
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/// _take a while_ to get reclaimed by the OS. Combined with the fact that libuv
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/// schedulers fork off a separate thread for polling fsevents on OSX, we get a
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/// perfect storm of creating "too many mappings" for valgrind to handle when
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/// running certain stress tests in the runtime.
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pub fn limit_thread_creation_due_to_osx_and_valgrind() -> bool {
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(cfg!(target_os="macos")) && running_on_valgrind()
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}
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pub fn min_stack() -> usize {
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static MIN: atomic::AtomicUsize = atomic::ATOMIC_USIZE_INIT;
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match MIN.load(Ordering::SeqCst) {
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0 => {}
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n => return n - 1,
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}
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let amt = env::var("RUST_MIN_STACK").ok().and_then(|s| s.parse().ok());
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let amt = amt.unwrap_or(2 * 1024 * 1024);
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// 0 is our sentinel value, so ensure that we'll never see 0 after
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// initialization has run
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MIN.store(amt + 1, Ordering::SeqCst);
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return amt;
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}
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// Indicates whether we should perform expensive sanity checks, including rtassert!
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//
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// FIXME: Once the runtime matures remove the `true` below to turn off rtassert,
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// etc.
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pub const ENFORCE_SANITY: bool = true || !cfg!(rtopt) || cfg!(rtdebug) ||
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cfg!(rtassert);
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pub fn dumb_print(args: fmt::Arguments) {
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let _ = Stderr::new().write_fmt(args);
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}
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pub fn abort(args: fmt::Arguments) -> ! {
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rterrln!("fatal runtime error: {}", args);
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unsafe { intrinsics::abort(); }
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}
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pub unsafe fn report_overflow() {
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use thread;
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rterrln!("\nthread '{}' has overflowed its stack",
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thread::current().name().unwrap_or("<unknown>"));
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}
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