Replace spin with parking_lot

Signing below refers to the Developer Certificate of Origin Version 1.1

Signed-off-by: Wim Looman <github@nemo157.com>

Cargo.toml

@@ -31,8 +31,8 @@ lazy_static = "1.4"
 libc = { version = "0.2", optional = true }
 protobuf = { version = "2.0", optional = true }
 reqwest = { version = "0.10", features = ["blocking"], optional = true }
-spin = "0.5.2"
 thiserror = "1.0"
+parking_lot = "0.10.2"
 
 [target.'cfg(target_os = "linux")'.dependencies]
 procfs = { version = "0.7", optional = true, default-features = false }

src/auto_flush.rs

@@ -3,7 +3,7 @@ use crate::counter::{CounterWithValueType, GenericLocalCounter};
 use crate::histogram::{Instant, LocalHistogram};
 use crate::metrics::MayFlush;
 use crate::timer;
-use spin::Mutex;
+use parking_lot::Mutex;
 use std::thread::LocalKey;
 
 /// Delegator for auto flush-able local counter

src/registry.rs

@@ -6,7 +6,7 @@ use std::collections::hash_map::Entry as HEntry;
 use std::collections::{BTreeMap, HashMap, HashSet};
 use std::sync::Arc;
 
-use spin::RwLock;
+use parking_lot::RwLock;
 
 use crate::errors::{Error, Result};
 use crate::metrics::Collector;

src/vec.rs

@@ -6,7 +6,7 @@ use std::hash::Hasher;
 use std::sync::Arc;
 
 use fnv::FnvHasher;
-use spin::RwLock;
+use parking_lot::RwLock;
 
 use crate::desc::{Desc, Describer};
 use crate::errors::{Error, Result};