diff --git a/src/hotspot/os_cpu/windows_aarch64/os_windows_aarch64.cpp b/src/hotspot/os_cpu/windows_aarch64/os_windows_aarch64.cpp index 2c2afb168fd..679e376ec98 100644 --- a/src/hotspot/os_cpu/windows_aarch64/os_windows_aarch64.cpp +++ b/src/hotspot/os_cpu/windows_aarch64/os_windows_aarch64.cpp @@ -291,6 +291,19 @@ int os::extra_bang_size_in_bytes() { extern "C" { int SpinPause() { - return 0; + using spin_wait_func_ptr_t = void (*)(); + spin_wait_func_ptr_t func = CAST_TO_FN_PTR(spin_wait_func_ptr_t, StubRoutines::aarch64::spin_wait()); + assert(func != nullptr, "StubRoutines::aarch64::spin_wait must not be null."); + (*func)(); + // If StubRoutines::aarch64::spin_wait consists of only a RET, + // SpinPause can be considered as implemented. There will be a sequence + // of instructions for: + // - call of SpinPause + // - load of StubRoutines::aarch64::spin_wait stub pointer + // - indirect call of the stub + // - return from the stub + // - return from SpinPause + // So '1' always is returned. + return 1; } };