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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);
}
};
}
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