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options/internal: ensure FutexLockImpl alignment to 4 bytes #1155

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Oct 14, 2024
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options/internal: ensure FutexLockImpl alignment to 4 bytes #1155

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6 changes: 5 additions & 1 deletion options/internal/include/mlibc/lock.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,8 +8,12 @@
#include <mlibc/tid.hpp>
#include <bits/ensure.h>

// alignas(4) is specified for the benefit of m68k, where default alignment is
// 2 bytes for a uint32_t, while the futex syscall requires 4-byte alignment.
// It is a no-op on any other architecture.

template<bool Recursive>
struct FutexLockImpl {
struct alignas(4) FutexLockImpl {
FutexLockImpl() : _state{0}, _recursion{0} { }

FutexLockImpl(const FutexLockImpl &) = delete;
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