Merge pull request #3315 from ziglang/mv-std-lib

Move std/ to lib/std/

1 files changed, 41 insertions, 0 deletions

diff --git a/lib/std/atomic/int.zig b/lib/std/atomic/int.zig
new file mode 100644
index 0000000000..94985b914f
--- /dev/null
+++ b/lib/std/atomic/int.zig
@@ -0,0 +1,41 @@
+const builtin = @import("builtin");
+const AtomicOrder = builtin.AtomicOrder;
+
+/// Thread-safe, lock-free integer
+pub fn Int(comptime T: type) type {
+    return struct {
+        unprotected_value: T,
+
+        pub const Self = @This();
+
+        pub fn init(init_val: T) Self {
+            return Self{ .unprotected_value = init_val };
+        }
+
+        /// Returns previous value
+        pub fn incr(self: *Self) T {
+            return @atomicRmw(T, &self.unprotected_value, builtin.AtomicRmwOp.Add, 1, AtomicOrder.SeqCst);
+        }
+
+        /// Returns previous value
+        pub fn decr(self: *Self) T {
+            return @atomicRmw(T, &self.unprotected_value, builtin.AtomicRmwOp.Sub, 1, AtomicOrder.SeqCst);
+        }
+
+        pub fn get(self: *Self) T {
+            return @atomicLoad(T, &self.unprotected_value, AtomicOrder.SeqCst);
+        }
+
+        pub fn set(self: *Self, new_value: T) void {
+            _ = self.xchg(new_value);
+        }
+
+        pub fn xchg(self: *Self, new_value: T) T {
+            return @atomicRmw(T, &self.unprotected_value, builtin.AtomicRmwOp.Xchg, new_value, AtomicOrder.SeqCst);
+        }
+
+        pub fn fetchAdd(self: *Self, op: T) T {
+            return @atomicRmw(T, &self.unprotected_value, builtin.AtomicRmwOp.Add, op, AtomicOrder.SeqCst);
+        }
+    };
+}