diff --git a/Project.toml b/Project.toml
index 64663c6..d89ad23 100644
--- a/Project.toml
+++ b/Project.toml
@@ -4,8 +4,10 @@ authors = ["Takafumi Arakaki <aka.tkf@gmail.com> and contributors"]
 version = "0.1.0-DEV"
 
 [deps]
+ConcurrentUtils = "3df5f688-6c4c-4767-8685-17f5ad261477"
 UnsafeAtomics = "013be700-e6cd-48c3-b4a1-df204f14c38f"
 
 [compat]
+ConcurrentUtils = "0.1"
 UnsafeAtomics = "0.1"
 julia = "1.7"
diff --git a/src/LeftRight.jl b/src/LeftRight.jl
index d757d5b..fff972e 100644
--- a/src/LeftRight.jl
+++ b/src/LeftRight.jl
@@ -2,13 +2,10 @@ baremodule LeftRight
 
 export guarding_read, guarding
 
-# TODO: Move them to ConcurrentUtils
-function guarding_read end
-function guarding end
-
 module Internal
 
 using UnsafeAtomics: UnsafeAtomics, acq_rel, seq_cst
+using ConcurrentUtils: ConcurrentUtils, guarding_read, guarding, spinloop
 
 using ..LeftRight: LeftRight
 
@@ -17,6 +14,8 @@ include("core.jl")
 
 end  # module Internal
 
+const guarding = Internal.guarding
+const guarding_read = Internal.guarding_read
 const Guard = Internal.Guard
 # const SimpleGuard = Internal.SimpleGuard
 
diff --git a/src/core.jl b/src/core.jl
index 4d051c9..1ac7137 100644
--- a/src/core.jl
+++ b/src/core.jl
@@ -180,7 +180,7 @@ function release_read(::GenericGuard, token)
     return
 end
 
-function LeftRight.guarding_read(f, g::GenericGuard)
+function ConcurrentUtils.guarding_read(f, g::GenericGuard)
     token, data = acquire_read(g)
     try
         return f(data)
@@ -189,7 +189,7 @@ function LeftRight.guarding_read(f, g::GenericGuard)
     end
 end
 
-function LeftRight.guarding(f!, g::GenericGuard)
+function ConcurrentUtils.guarding(f!, g::GenericGuard)
     lock(g.lock)
     try
         # No need to use `:acquire` since the lock already has ordered the access:
diff --git a/src/utils.jl b/src/utils.jl
index c01a219..6c0328c 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -10,8 +10,3 @@ end
 const var"@const" = var"@_const"
 
 pad7() = ntuple(_ -> 0, Val(7))
-
-function spinloop()
-    GC.safepoint()
-    ccall(:jl_cpu_pause, Cvoid, ())
-end