cursed: add Mutex type

Signed-off-by: Xe Iaso <me@xeiaso.net>

1 files changed, 22 insertions, 0 deletions

diff --git a/cursed/mutex.go b/cursed/mutex.go
new file mode 100644
index 0000000..82fe58f
--- /dev/null
+++ b/cursed/mutex.go
@@ -0,0 +1,22 @@
+package cursed
+
+import "sync"
+
+// Mutex is a generic locking container for Go much like Rust's std::sync::Mutex<T>.
+//
+// It differs from a normal sync.Mutex because it guards a value instead of just
+// being something you lock and unlock to guard another value. When you are done with
+// the value, call the function return to re-lock the mutex.
+type Mutex[T any] struct {
+	val  T
+	lock sync.Mutex
+}
+
+func NewMutex[T any](val T) *Mutex[T] {
+	return &Mutex[T]{val: val}
+}
+
+func (mu *Mutex[T]) Unlock() (T, func()) {
+	mu.lock.Lock()
+	return mu.val, func() { mu.lock.Unlock() }
+}