44 lines
1.3 KiB
Zig
44 lines
1.3 KiB
Zig
// SPDX-License-Identifier: MIT
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// Copyright (c) 2015-2020 Zig Contributors
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// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
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// The MIT license requires this copyright notice to be included in all copies
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// and substantial portions of the software.
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/// Thread-safe, lock-free integer
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pub fn Int(comptime T: type) type {
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return struct {
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unprotected_value: T,
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pub const Self = @This();
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pub fn init(init_val: T) Self {
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return Self{ .unprotected_value = init_val };
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}
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/// Returns previous value
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pub fn incr(self: *Self) T {
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return @atomicRmw(T, &self.unprotected_value, .Add, 1, .SeqCst);
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}
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/// Returns previous value
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pub fn decr(self: *Self) T {
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return @atomicRmw(T, &self.unprotected_value, .Sub, 1, .SeqCst);
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}
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pub fn get(self: *Self) T {
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return @atomicLoad(T, &self.unprotected_value, .SeqCst);
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}
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pub fn set(self: *Self, new_value: T) void {
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_ = self.xchg(new_value);
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}
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pub fn xchg(self: *Self, new_value: T) T {
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return @atomicRmw(T, &self.unprotected_value, .Xchg, new_value, .SeqCst);
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}
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pub fn fetchAdd(self: *Self, op: T) T {
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return @atomicRmw(T, &self.unprotected_value, .Add, op, .SeqCst);
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}
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};
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}
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