1 files changed, 57 insertions, 0 deletions
diff --git a/misc.go b/misc.go
new file mode 100644
index 0000000..80e33f6
--- /dev/null
+++ b/misc.go
@@ -0,0 +1,57 @@
+package main
+
+import (
+	"sync/atomic"
+)
+
+/* Atomic Boolean */
+
+const (
+	AtomicFalse = int32(iota)
+	AtomicTrue
+)
+
+type AtomicBool struct {
+	flag int32
+}
+
+func (a *AtomicBool) Get() bool {
+	return atomic.LoadInt32(&a.flag) == AtomicTrue
+}
+
+func (a *AtomicBool) Swap(val bool) bool {
+	flag := AtomicFalse
+	if val {
+		flag = AtomicTrue
+	}
+	return atomic.SwapInt32(&a.flag, flag) == AtomicTrue
+}
+
+func (a *AtomicBool) Set(val bool) {
+	flag := AtomicFalse
+	if val {
+		flag = AtomicTrue
+	}
+	atomic.StoreInt32(&a.flag, flag)
+}
+
+/* Integer manipulation */
+
+func toInt32(n uint32) int32 {
+	mask := uint32(1 << 31)
+	return int32(-(n & mask) + (n & ^mask))
+}
+
+func min(a uint, b uint) uint {
+	if a > b {
+		return b
+	}
+	return a
+}
+
+func minUint64(a uint64, b uint64) uint64 {
+	if a > b {
+		return b
+	}
+	return a
+}