Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/MtProtoKit/Sources/MTAtomic.m

@@ -0,0 +1,64 @@
+#import <MtProtoKit/MTAtomic.h>
+
+#import <os/lock.h>
+
+@interface MTAtomic ()
+{
+    os_unfair_lock _lock;
+    id _value;
+}
+
+@end
+
+@implementation MTAtomic
+
+- (instancetype)initWithValue:(id)value
+{
+    self = [super init];
+    if (self != nil)
+    {
+        _value = value;
+    }
+    return self;
+}
+
+- (id)swap:(id)newValue
+{
+    id previousValue = nil;
+    os_unfair_lock_lock(&_lock);
+    previousValue = _value;
+    _value = newValue;
+    os_unfair_lock_unlock(&_lock);
+    return previousValue;
+}
+
+- (id)value
+{
+    id previousValue = nil;
+    os_unfair_lock_lock(&_lock);
+    previousValue = _value;
+    os_unfair_lock_unlock(&_lock);
+    
+    return previousValue;
+}
+
+- (id)modify:(id (^)(id))f
+{
+    id newValue = nil;
+    os_unfair_lock_lock(&_lock);
+    newValue = f(_value);
+    _value = newValue;
+    os_unfair_lock_unlock(&_lock);
+    return newValue;
+}
+
+- (id)with:(id (^)(id))f
+{
+    id result = nil;
+    os_unfair_lock_lock(&_lock);
+    result = f(_value);
+    os_unfair_lock_unlock(&_lock);
+    return result;
+}
+
+@end