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;
35 //! use std::task::TaskBuilder;
36 //! use native::NativeTaskBuilder;
39 //! // We're not sure whether this main function is run in 1:1 or M:N mode.
41 //! TaskBuilder::new().native().spawn(proc() {
42 //! // this code is guaranteed to be run on a native thread
47 #![crate_id = "native#0.11.0-pre"]
48 #![license = "MIT/ASL2"]
49 #![crate_type = "rlib"]
50 #![crate_type = "dylib"]
51 #![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
52 html_favicon_url = "http://www.rust-lang.org/favicon.ico",
53 html_root_url = "http://doc.rust-lang.org/")]
54 #![deny(unused_result, unused_must_use)]
55 #![allow(non_camel_case_types)]
57 #![feature(default_type_params)]
59 // NB this crate explicitly does *not* allow glob imports, please seriously
60 // consider whether they're needed before adding that feature here (the
61 // answer is that you don't need them)
62 #![feature(macro_rules)]
66 #[cfg(test)] extern crate debug;
72 pub use task::NativeTaskBuilder;
79 static OS_DEFAULT_STACK_ESTIMATE: uint = 1 << 20;
80 #[cfg(unix, not(android))]
81 static OS_DEFAULT_STACK_ESTIMATE: uint = 2 * (1 << 20);
85 pub fn lang_start(main: *u8, argc: int, argv: **u8) -> int {
87 start(argc, argv, proc() {
88 let main: extern "Rust" fn() = unsafe { mem::transmute(main) };
93 /// Executes the given procedure after initializing the runtime with the given
96 /// This procedure is guaranteed to run on the thread calling this function, but
97 /// the stack bounds for this rust task will *not* be set. Care must be taken
98 /// for this function to not overflow its stack.
100 /// This function will only return once *all* native threads in the system have
102 pub fn start(argc: int, argv: **u8, main: proc()) -> int {
103 let something_around_the_top_of_the_stack = 1;
104 let addr = &something_around_the_top_of_the_stack as *int;
105 let my_stack_top = addr as uint;
107 // FIXME #11359 we just assume that this thread has a stack of a
108 // certain size, and estimate that there's at most 20KB of stack
109 // frames above our current position.
110 let my_stack_bottom = my_stack_top + 20000 - OS_DEFAULT_STACK_ESTIMATE;
112 // When using libgreen, one of the first things that we do is to turn off
113 // the SIGPIPE signal (set it to ignore). By default, some platforms will
114 // send a *signal* when a EPIPE error would otherwise be delivered. This
115 // runtime doesn't install a SIGPIPE handler, causing it to kill the
116 // program, which isn't exactly what we want!
118 // Hence, we set SIGPIPE to ignore when the program starts up in order to
119 // prevent this problem.
120 #[cfg(windows)] fn ignore_sigpipe() {}
121 #[cfg(unix)] fn ignore_sigpipe() {
123 use libc::funcs::posix01::signal::signal;
125 assert!(signal(libc::SIGPIPE, libc::SIG_IGN) != -1);
130 rt::init(argc, argv);
131 let mut exit_code = None;
132 let mut main = Some(main);
133 let mut task = task::new((my_stack_bottom, my_stack_top));
134 task.name = Some(str::Slice("<main>"));
135 let t = task.run(|| {
137 rt::stack::record_stack_bounds(my_stack_bottom, my_stack_top);
139 exit_code = Some(run(main.take_unwrap()));
142 unsafe { rt::cleanup(); }
143 // If the exit code wasn't set, then the task block must have failed.
144 return exit_code.unwrap_or(rt::DEFAULT_ERROR_CODE);
147 /// Executes a procedure on the current thread in a Rust task context.
149 /// This function has all of the same details as `start` except for a different
150 /// number of arguments.
151 pub fn run(main: proc()) -> int {
153 os::get_exit_status()