diff --git a/src/internal/task/atomic-cooperative.go b/src/internal/task/atomic-cooperative.go
new file mode 100644
index 000000000..60eb917a8
--- /dev/null
+++ b/src/internal/task/atomic-cooperative.go
@@ -0,0 +1,41 @@
+package task
+
+// Atomics implementation for cooperative systems. The atomic types here aren't
+// actually atomic, they assume that accesses cannot be interrupted by a
+// different goroutine or interrupt happening at the same time.
+
+type atomicIntegerType interface {
+	uintptr | uint32 | uint64
+}
+
+type pseudoAtomic[T atomicIntegerType] struct {
+	v T
+}
+
+func (x *pseudoAtomic[T]) Add(delta T) T { x.v += delta; return x.v }
+func (x *pseudoAtomic[T]) Load() T       { return x.v }
+func (x *pseudoAtomic[T]) Store(val T)   { x.v = val }
+func (x *pseudoAtomic[T]) CompareAndSwap(old, new T) (swapped bool) {
+	if x.v != old {
+		return false
+	}
+	x.v = new
+	return true
+}
+func (x *pseudoAtomic[T]) Swap(new T) (old T) {
+	old = x.v
+	x.v = new
+	return
+}
+
+// Uintptr is an atomic uintptr when multithreading is enabled, and a plain old
+// uintptr otherwise.
+type Uintptr = pseudoAtomic[uintptr]
+
+// Uint32 is an atomic uint32 when multithreading is enabled, and a plain old
+// uint32 otherwise.
+type Uint32 = pseudoAtomic[uint32]
+
+// Uint64 is an atomic uint64 when multithreading is enabled, and a plain old
+// uint64 otherwise.
+type Uint64 = pseudoAtomic[uint64]