1 files changed, 41 insertions, 0 deletions
diff --git a/vendor/codeberg.org/gruf/go-mutexes/map_unsafe.go b/vendor/codeberg.org/gruf/go-mutexes/map_unsafe.go
new file mode 100644
index 000000000..a59c13015
--- /dev/null
+++ b/vendor/codeberg.org/gruf/go-mutexes/map_unsafe.go
@@ -0,0 +1,41 @@
+//go:build go1.22 && !go1.25
+
+package mutexes
+
+import (
+	"sync"
+	"sync/atomic"
+	"unsafe"
+)
+
+// syncCond_last_ticket is an unsafe function that returns
+// the ticket of the last awoken / notified goroutine by a
+// a sync.Cond{}. it relies on expected memory layout.
+func syncCond_last_ticket(c *sync.Cond) uint32 {
+
+	// NOTE: must remain in
+	// sync with runtime.notifyList{}.
+	//
+	// goexperiment.staticlockranking
+	// does change it slightly, but
+	// this does not alter the first
+	// 2 fields which are all we need.
+	type notifyList struct {
+		_      atomic.Uint32
+		notify uint32
+		// ... other fields
+	}
+
+	// NOTE: must remain in
+	// sync with sync.Cond{}.
+	type syncCond struct {
+		_ struct{}
+		L sync.Locker
+		n notifyList
+		// ... other fields
+	}
+
+	// This field must be atomcially accessed.
+	cptr := (*syncCond)(unsafe.Pointer(c))
+	return atomic.LoadUint32(&cptr.n.notify)
+}