rust_asio 0.6.0

Asynchronous I/O library
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

use std::io;
use std::marker::PhantomData;
use kernel32::{TlsAlloc, TlsFree, TlsGetValue, TlsSetValue};
use winapi::DWORD;

const TLS_OUT_OF_INDEXES: DWORD = 0xffffffff;

pub struct WinTssPtr<T> {
    tss_key: DWORD,
    _marker: PhantomData<T>,
}

impl<T> Drop for WinTssPtr<T> {
    fn drop(&mut self) {
        unsafe { TlsFree(self.tss_key) };
    }
}

impl<T> WinTssPtr<T> {
    pub fn new() -> io::Result<Self> {
        let tss_key = unsafe { TlsAlloc() };
        if tss_key == TLS_OUT_OF_INDEXES {
            return Err(io::Error::last_os_error());
        }
        Ok(WinTssPtr {
            tss_key: tss_key,
            _marker: PhantomData,
        })
    }

    pub fn get(&self) -> *mut T {
        unsafe { TlsGetValue(self.tss_key) as *mut _ }
    }

    pub fn set(&self, ptr: *mut T) {
        unsafe { TlsSetValue(self.tss_key, ptr as _) };
    }
}

unsafe impl<T> Send for WinTssPtr<T> { }

unsafe impl<T> Sync for WinTssPtr<T> { }