28 lines
646 B
Zig
28 lines
646 B
Zig
const assert = @import("std").debug.assert;
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const builtin = @import("builtin");
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const AtomicRmwOp = builtin.AtomicRmwOp;
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const AtomicOrder = builtin.AtomicOrder;
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test "cmpxchg" {
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var x: i32 = 1234;
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while (!@cmpxchg(&x, 1234, 5678, AtomicOrder.SeqCst, AtomicOrder.SeqCst)) {}
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assert(x == 5678);
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}
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test "fence" {
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var x: i32 = 1234;
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@fence(AtomicOrder.SeqCst);
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x = 5678;
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}
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test "atomicrmw" {
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var data: u8 = 200;
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testAtomicRmw(&data);
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assert(data == 42);
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}
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fn testAtomicRmw(ptr: &u8) void {
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const prev_value = @atomicRmw(u8, ptr, AtomicRmwOp.Xchg, 42, AtomicOrder.SeqCst);
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assert(prev_value == 200);
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}
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