/
static_deadlock.rs
54 lines (48 loc) · 1.3 KB
/
static_deadlock.rs
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use std::collections::HashMap;
use anyhow::anyhow;
use std::sync::RwLock;
lazy_static::lazy_static! {
static ref GLOBAL_MAP: RwLock<HashMap<String,String>> = RwLock::new({
let map = HashMap::new();
map
});
}
fn main() {
for i in 0..3 {
insert_global_map(i.to_string(), i.to_string())
}
print_global_map();
get_and_remove(1);
println!("finished!");
}
fn insert_global_map(k: String, v: String) {
let mut gpw = GLOBAL_MAP.write().unwrap();
gpw.insert(k, v);
}
fn print_global_map() {
let gpr = GLOBAL_MAP.read().unwrap();
for pair in gpr.iter() {
println!("{:?}", pair);
}
}
fn get_and_remove_deadlock(k: i32) {
println!("execute get_and_remove");
let gpr = GLOBAL_MAP.read().unwrap();
let v = gpr.get(&*k.to_string().clone());
let mut gpw = GLOBAL_MAP.write().unwrap();
gpw.remove(&*k.to_string().clone());
}
fn get_and_remove(k: i32) {
let v = {
let gpr = GLOBAL_MAP.read().unwrap();
let v = gpr.get(&*k.to_string().clone());
match v {
None => Err(anyhow!("")),
Some(pair) => Ok(pair.to_string().clone()),
}
};
let vstr = v.unwrap();
println!("get value is {:?}", vstr.clone());
let mut gpw = GLOBAL_MAP.write().unwrap();
gpw.remove(&*vstr);
}