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    // Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    use prelude::v1::*;

    use alloc::boxed::FnBox;
    use cmp;
    #[cfg(not(any(target_env = "newlib", target_os = "solaris")))]
    use ffi::CStr;
    use io;
    use libc;
    use mem;
    use ptr;
    use sys::os;
    use time::Duration;

    use sys_common::thread::*;

    pub struct Thread {
        id: libc::pthread_t,
    }

    // Some platforms may have pthread_t as a pointer in which case we still want
    // a thread to be Send/Sync
    unsafe impl Send for Thread {}
    unsafe impl Sync for Thread {}

    impl Thread {
        pub unsafe fn new<'a>(stack: usize, p: Box<FnBox() + 'a>)
                              -> io::Result<Thread> {
            let p = box p;
            let mut native: libc::pthread_t = mem::zeroed();
            let mut attr: libc::pthread_attr_t = mem::zeroed();
            assert_eq!(libc::pthread_attr_init(&mut attr), 0);

            let stack_size = cmp::max(stack, min_stack_size(&attr));
            match libc::pthread_attr_setstacksize(&mut attr,
                                                  stack_size as libc::size_t) {
                0 => {}
                n => {
                    assert_eq!(n, libc::EINVAL);
                    // EINVAL means |stack_size| is either too small or not a
                    // multiple of the system page size.  Because it's definitely
                    // >= PTHREAD_STACK_MIN, it must be an alignment issue.
                    // Round up to the nearest page and try again.
                    let page_size = os::page_size();
                    let stack_size = (stack_size + page_size - 1) &
                                     (-(page_size as isize - 1) as usize - 1);
                    let stack_size = stack_size as libc::size_t;
                    assert_eq!(libc::pthread_attr_setstacksize(&mut attr,
                                                               stack_size), 0);
                }
            };

            let ret = libc::pthread_create(&mut native, &attr, thread_start,
                                           &*p as *const _ as *mut _);
            assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);

            return if ret != 0 {
                Err(io::Error::from_raw_os_error(ret))
            } else {
                mem::forget(p); // ownership passed to pthread_create
                Ok(Thread { id: native })
            };

            extern fn thread_start(main: *mut libc::c_void) -> *mut libc::c_void {
                unsafe { start_thread(main); }
                ptr::null_mut()
            }
        }

        pub fn yield_now() {
            let ret = unsafe { libc::sched_yield() };
            debug_assert_eq!(ret, 0);
        }

        #[cfg(any(target_os = "linux",
                  target_os = "android",
                  target_os = "emscripten"))]
        pub fn set_name(name: &CStr) {
            const PR_SET_NAME: libc::c_int = 15;
            // pthread wrapper only appeared in glibc 2.12, so we use syscall
            // directly.
            unsafe {
                libc::prctl(PR_SET_NAME, name.as_ptr() as libc::c_ulong, 0, 0, 0);
            }
        }

        #[cfg(any(target_os = "freebsd",
                  target_os = "dragonfly",
                  target_os = "bitrig",
                  target_os = "openbsd"))]
        pub fn set_name(name: &CStr) {
            unsafe {
                libc::pthread_set_name_np(libc::pthread_self(), name.as_ptr());
            }
        }

        #[cfg(any(target_os = "macos", target_os = "ios"))]
        pub fn set_name(name: &CStr) {
            unsafe {
                libc::pthread_setname_np(name.as_ptr());
            }
        }

        #[cfg(target_os = "netbsd")]
        pub fn set_name(name: &CStr) {
            use ffi::CString;
            let cname = CString::new(&b"%s"[..]).unwrap();
            unsafe {
                libc::pthread_setname_np(libc::pthread_self(), cname.as_ptr(),
                                         name.as_ptr() as *mut libc::c_void);
            }
        }
        #[cfg(any(target_env = "newlib", target_os = "solaris"))]
        pub fn set_name(_name: &CStr) {
            // Newlib and Illumos has no way to set a thread name.
        }

        pub fn sleep(dur: Duration) {
            let mut ts = libc::timespec {
                tv_sec: dur.as_secs() as libc::time_t,
                tv_nsec: dur.subsec_nanos() as libc::c_long,
            };

            // If we're awoken with a signal then the return value will be -1 and
            // nanosleep will fill in `ts` with the remaining time.
            unsafe {
                while libc::nanosleep(&ts, &mut ts) == -1 {
                    assert_eq!(os::errno(), libc::EINTR);
                }
            }
        }

        pub fn join(self) {
            unsafe {
                let ret = libc::pthread_join(self.id, ptr::null_mut());
                mem::forget(self);
                debug_assert_eq!(ret, 0);
            }
        }

        pub fn id(&self) -> libc::pthread_t { self.id }

        pub fn into_id(self) -> libc::pthread_t {
            let id = self.id;
            mem::forget(self);
            id
        }
    }

    impl Drop for Thread {
        fn drop(&mut self) {
            let ret = unsafe { libc::pthread_detach(self.id) };
            debug_assert_eq!(ret, 0);
        }
    }

    #[cfg(all(not(all(target_os = "linux", not(target_env = "musl"))),
              not(target_os = "freebsd"),
              not(target_os = "macos"),
              not(target_os = "bitrig"),
              not(all(target_os = "netbsd", not(target_vendor = "rumprun"))),
              not(target_os = "openbsd"),
              not(target_os = "solaris")))]
    #[cfg_attr(test, allow(dead_code))]
    pub mod guard {
        pub unsafe fn current() -> Option<usize> { None }
        pub unsafe fn init() -> Option<usize> { None }
    }

    #[cfg(any(all(target_os = "linux", not(target_env = "musl")),
              target_os = "freebsd",
              target_os = "macos",
              target_os = "bitrig",
              all(target_os = "netbsd", not(target_vendor = "rumprun")),
              target_os = "openbsd",
              target_os = "solaris"))]
    #[cfg_attr(test, allow(dead_code))]
    pub mod guard {
        use prelude::v1::*;

        use libc;
        use libc::mmap;
        use libc::{PROT_NONE, MAP_PRIVATE, MAP_ANON, MAP_FAILED, MAP_FIXED};
        use sys::os;

        #[cfg(any(target_os = "macos",
                  target_os = "bitrig",
                  target_os = "openbsd",
                  target_os = "solaris"))]
        unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
            current().map(|s| s as *mut libc::c_void)
        }

        #[cfg(any(target_os = "android", target_os = "freebsd",
                  target_os = "linux", target_os = "netbsd"))]
        unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
            let mut ret = None;
            let mut attr: libc::pthread_attr_t = ::mem::zeroed();
            assert_eq!(libc::pthread_attr_init(&mut attr), 0);
            #[cfg(target_os = "freebsd")]
                let e = libc::pthread_attr_get_np(libc::pthread_self(), &mut attr);
            #[cfg(not(target_os = "freebsd"))]
                let e = libc::pthread_getattr_np(libc::pthread_self(), &mut attr);
            if e == 0 {
                let mut stackaddr = ::ptr::null_mut();
                let mut stacksize = 0;
                assert_eq!(libc::pthread_attr_getstack(&attr, &mut stackaddr,
                                                       &mut stacksize), 0);
                ret = Some(stackaddr);
            }
            assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
            ret
        }

        pub unsafe fn init() -> Option<usize> {
            let psize = os::page_size();
            let mut stackaddr = match get_stack_start() {
                Some(addr) => addr,
                None => return None,
            };

            // Ensure stackaddr is page aligned! A parent process might
            // have reset RLIMIT_STACK to be non-page aligned. The
            // pthread_attr_getstack() reports the usable stack area
            // stackaddr < stackaddr + stacksize, so if stackaddr is not
            // page-aligned, calculate the fix such that stackaddr <
            // new_page_aligned_stackaddr < stackaddr + stacksize
            let remainder = (stackaddr as usize) % psize;
            if remainder != 0 {
                stackaddr = ((stackaddr as usize) + psize - remainder)
                    as *mut libc::c_void;
            }

            // Rellocate the last page of the stack.
            // This ensures SIGBUS will be raised on
            // stack overflow.
            let result = mmap(stackaddr,
                              psize as libc::size_t,
                              PROT_NONE,
                              MAP_PRIVATE | MAP_ANON | MAP_FIXED,
                              -1,
                              0);

            if result != stackaddr || result == MAP_FAILED {
                panic!("failed to allocate a guard page");
            }

            let offset = if cfg!(any(target_os = "linux", target_os = "freebsd")) {
                2
            } else {
                1
            };

            Some(stackaddr as usize + offset * psize)
        }

        #[cfg(target_os = "solaris")]
        pub unsafe fn current() -> Option<usize> {
            let mut current_stack: libc::stack_t = ::mem::zeroed();
            assert_eq!(libc::stack_getbounds(&mut current_stack), 0);
            Some(current_stack.ss_sp as usize)
        }

        #[cfg(target_os = "macos")]
        pub unsafe fn current() -> Option<usize> {
            Some((libc::pthread_get_stackaddr_np(libc::pthread_self()) as libc::size_t -
                  libc::pthread_get_stacksize_np(libc::pthread_self())) as usize)
        }

        #[cfg(any(target_os = "openbsd", target_os = "bitrig"))]
        pub unsafe fn current() -> Option<usize> {
            let mut current_stack: libc::stack_t = ::mem::zeroed();
            assert_eq!(libc::pthread_stackseg_np(libc::pthread_self(),
                                                 &mut current_stack), 0);

            let extra = if cfg!(target_os = "bitrig") {3} else {1} * os::page_size();
            Some(if libc::pthread_main_np() == 1 {
                // main thread
                current_stack.ss_sp as usize - current_stack.ss_size as usize + extra
            } else {
                // new thread
                current_stack.ss_sp as usize - current_stack.ss_size as usize
            })
        }

        #[cfg(any(target_os = "android", target_os = "freebsd",
                  target_os = "linux", target_os = "netbsd"))]
        pub unsafe fn current() -> Option<usize> {
            let mut ret = None;
            let mut attr: libc::pthread_attr_t = ::mem::zeroed();
            assert_eq!(libc::pthread_attr_init(&mut attr), 0);
            #[cfg(target_os = "freebsd")]
                let e = libc::pthread_attr_get_np(libc::pthread_self(), &mut attr);
            #[cfg(not(target_os = "freebsd"))]
                let e = libc::pthread_getattr_np(libc::pthread_self(), &mut attr);
            if e == 0 {
                let mut guardsize = 0;
                assert_eq!(libc::pthread_attr_getguardsize(&attr, &mut guardsize), 0);
                if guardsize == 0 {
                    panic!("there is no guard page");
                }
                let mut stackaddr = ::ptr::null_mut();
                let mut size = 0;
                assert_eq!(libc::pthread_attr_getstack(&attr, &mut stackaddr,
                                                       &mut size), 0);

                ret = if cfg!(target_os = "freebsd") {
                    Some(stackaddr as usize - guardsize as usize)
                } else if cfg!(target_os = "netbsd") {
                    Some(stackaddr as usize)
                } else {
                    Some(stackaddr as usize + guardsize as usize)
                };
            }
            assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
            ret
        }
    }

    // glibc >= 2.15 has a __pthread_get_minstack() function that returns
    // PTHREAD_STACK_MIN plus however many bytes are needed for thread-local
    // storage.  We need that information to avoid blowing up when a small stack
    // is created in an application with big thread-local storage requirements.
    // See #6233 for rationale and details.
    #[cfg(target_os = "linux")]
    #[allow(deprecated)]
    fn min_stack_size(attr: *const libc::pthread_attr_t) -> usize {
        weak!(fn __pthread_get_minstack(*const libc::pthread_attr_t) -> libc::size_t);

        match __pthread_get_minstack.get() {
            None => libc::PTHREAD_STACK_MIN as usize,
            Some(f) => unsafe { f(attr) as usize },
        }
    }

    // No point in looking up __pthread_get_minstack() on non-glibc
    // platforms.
    #[cfg(all(not(target_os = "linux"),
              not(target_os = "netbsd")))]
    fn min_stack_size(_: *const libc::pthread_attr_t) -> usize {
        libc::PTHREAD_STACK_MIN as usize
    }

    #[cfg(target_os = "netbsd")]
    fn min_stack_size(_: *const libc::pthread_attr_t) -> usize {
        2048 // just a guess
    }

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