1 // Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
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.
11 //! The native I/O and threading crate
13 //! This crate contains an implementation of 1:1 scheduling for a "native"
14 //! runtime. In addition, all I/O provided by this crate is the thread blocking
17 //! # Starting with libnative
20 //! extern crate native;
23 //! fn start(argc: int, argv: **u8) -> int { native::start(argc, argv, main) }
26 //! // this code is running on the main OS thread
30 //! # Force spawning a native task
33 //! extern crate native;
36 //! // We're not sure whether this main function is run in 1:1 or M:N mode.
38 //! native::task::spawn(proc() {
39 //! // this code is guaranteed to be run on a native thread
44 #[crate_id = "native#0.10-pre"];
45 #[license = "MIT/ASL2"];
46 #[crate_type = "rlib"];
47 #[crate_type = "dylib"];
48 #[doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
49 html_favicon_url = "http://www.rust-lang.org/favicon.ico",
50 html_root_url = "http://static.rust-lang.org/doc/master")];
51 #[deny(unused_result, unused_must_use)];
52 #[allow(non_camel_case_types)];
54 // NB this crate explicitly does *not* allow glob imports, please seriously
55 // consider whether they're needed before adding that feature here (the
56 // answer is that you don't need them)
67 static OS_DEFAULT_STACK_ESTIMATE: uint = 1 << 20;
68 #[cfg(unix, not(android))]
69 static OS_DEFAULT_STACK_ESTIMATE: uint = 2 * (1 << 20);
72 #[cfg(not(test), not(stage0))]
73 pub fn lang_start(main: *u8, argc: int, argv: **u8) -> int {
75 start(argc, argv, proc() {
76 let main: extern "Rust" fn() = unsafe { cast::transmute(main) };
81 /// Executes the given procedure after initializing the runtime with the given
84 /// This procedure is guaranteed to run on the thread calling this function, but
85 /// the stack bounds for this rust task will *not* be set. Care must be taken
86 /// for this function to not overflow its stack.
88 /// This function will only return once *all* native threads in the system have
90 pub fn start(argc: int, argv: **u8, main: proc()) -> int {
91 let something_around_the_top_of_the_stack = 1;
92 let addr = &something_around_the_top_of_the_stack as *int;
93 let my_stack_top = addr as uint;
95 // FIXME #11359 we just assume that this thread has a stack of a
96 // certain size, and estimate that there's at most 20KB of stack
97 // frames above our current position.
98 let my_stack_bottom = my_stack_top + 20000 - OS_DEFAULT_STACK_ESTIMATE;
100 rt::init(argc, argv);
101 let mut exit_code = None;
102 let mut main = Some(main);
103 let mut task = task::new((my_stack_bottom, my_stack_top));
104 task.name = Some(str::Slice("<main>"));
105 let t = task.run(|| {
107 rt::stack::record_stack_bounds(my_stack_bottom, my_stack_top);
109 exit_code = Some(run(main.take_unwrap()));
112 unsafe { rt::cleanup(); }
113 // If the exit code wasn't set, then the task block must have failed.
114 return exit_code.unwrap_or(rt::DEFAULT_ERROR_CODE);
117 /// Executes a procedure on the current thread in a Rust task context.
119 /// This function has all of the same details as `start` except for a different
120 /// number of arguments.
121 pub fn run(main: proc()) -> int {
123 os::get_exit_status()