(index<- ) ./libstd/rt/env.rs
git branch: * master 5200215 auto merge of #14035 : alexcrichton/rust/experimental, r=huonw
modified: Fri May 9 13:02:28 2014
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
4 //
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
10
11 //! Runtime environment settings
12
13 use from_str::from_str;
14 use option::{Some, None, Expect};
15 use os;
16
17 // Note that these are all accessed without any synchronization.
18 // They are expected to be initialized once then left alone.
19
20 static mut MIN_STACK: uint = 2 * 1024 * 1024;
21 /// This default corresponds to 20M of cache per scheduler (at the default size).
22 static mut MAX_CACHED_STACKS: uint = 10;
23 static mut DEBUG_BORROW: bool = false;
24
25 pub fn init() {
26 unsafe {
27 match os::getenv("RUST_MIN_STACK") {
28 Some(s) => match from_str(s) {
29 Some(i) => MIN_STACK = i,
30 None => ()
31 },
32 None => ()
33 }
34 match os::getenv("RUST_MAX_CACHED_STACKS") {
35 Some(max) => MAX_CACHED_STACKS = from_str(max).expect("expected positive integer in \
36 RUST_MAX_CACHED_STACKS"),
37 None => ()
38 }
39 match os::getenv("RUST_DEBUG_BORROW") {
40 Some(_) => DEBUG_BORROW = true,
41 None => ()
42 }
43 }
44 }
45
46 pub fn min_stack() -> uint {
47 unsafe { MIN_STACK }
48 }
49
50 pub fn max_cached_stacks() -> uint {
51 unsafe { MAX_CACHED_STACKS }
52 }
53
54 pub fn debug_borrow() -> bool {
55 unsafe { DEBUG_BORROW }
56 }