Files
aho_corasick
atty
beef
bitflags
bstr
byteorder
cfg_if
clap
clap_derive
codespan
codespan_reporting
crc_any
crypto_hash
csv
csv_core
debug_helper
filepath
fixed
fixed_macro
fixed_macro_impl
fixed_macro_types
fnv
foreign_types
foreign_types_shared
getrandom
glob
hashbrown
heck
hex
indexmap
itoa
lazy_static
libc
linked_hash_map
linked_hash_set
logos
logos_derive
lrl_test_compiler
maplit
memchr
memoffset
once_cell
openssl
openssl_sys
os_str_bytes
paste
pest
pest_derive
pest_generator
pest_meta
phf
phf_generator
phf_macros
phf_shared
ppv_lite86
proc_macro2
proc_macro_error
proc_macro_error_attr
proc_macro_hack
quote
rand
rand_chacha
rand_core
regex
regex_automata
regex_syntax
remove_dir_all
ring
rowan
rustc_hash
ryu
semver
semver_parser
serde
serde_derive
serde_json
siphasher
smallvec
smawk
smol_str
spin
stable_deref_trait
strsim
syn
taplo
tempfile
termcolor
text_size
textwrap
toml
triomphe
typenum
ucd_trie
unicode_linebreak
unicode_segmentation
unicode_width
unicode_xid
untrusted
utf8_ranges
vec_map
 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
use std::fmt::{self, Debug};
use std::thread::{self, ThreadId};

/// ThreadBound is a Sync-maker and Send-maker that allows accessing a value
/// of type T only from the original thread on which the ThreadBound was
/// constructed.
pub struct ThreadBound<T> {
    value: T,
    thread_id: ThreadId,
}

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

// Send bound requires Copy, as otherwise Drop could run in the wrong place.
unsafe impl<T: Copy> Send for ThreadBound<T> {}

impl<T> ThreadBound<T> {
    pub fn new(value: T) -> Self {
        ThreadBound {
            value,
            thread_id: thread::current().id(),
        }
    }

    pub fn get(&self) -> Option<&T> {
        if thread::current().id() == self.thread_id {
            Some(&self.value)
        } else {
            None
        }
    }
}

impl<T: Debug> Debug for ThreadBound<T> {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        match self.get() {
            Some(value) => Debug::fmt(value, formatter),
            None => formatter.write_str("unknown"),
        }
    }
}