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progressive_backoff_wait: add 32-bit ARM implementation #21

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progressive_backoff_wait: add 32-bit ARM implementation #21

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57 changes: 56 additions & 1 deletion include/crill/impl/progressive_backoff_wait_impl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@

#if CRILL_INTEL
#include <emmintrin.h>
#elif CRILL_ARM_64BIT
#elif CRILL_ARM
#include <arm_acle.h>
#endif

Expand Down Expand Up @@ -85,6 +85,61 @@ namespace crill::impl
}
}
#endif // CRILL_ARM_64BIT

#if CRILL_ARM_32BIT
template <std::size_t N0, std::size_t N1, typename Predicate>
void progressive_backoff_wait_armv7(Predicate&& pred)
{
for (int i = 0; i < N0; ++i)
{
if (pred())
return;
}

while (true)
{
for (int i = 0; i < N1; ++i)
{
if (pred())
return;

__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
__yield();
}

// waiting longer than we should, let's give other threads a chance to recover
std::this_thread::yield();
}
}
#endif // CRILL_ARM_32BIT
} // namespace crill::impl

#endif //CRILL_PROGRESSIVE_BACKOFF_WAIT_IMPL_H
4 changes: 4 additions & 0 deletions include/crill/progressive_backoff_wait.h
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,10 @@ void progressive_backoff_wait(Predicate&& pred)
impl::progressive_backoff_wait_armv8<2, 750>(std::forward<Predicate>(pred));
// approx. 2x10 ns (= 20 ns) and 750x1333 ns (~ 1 ms), respectively, on an
// Apple Silicon Mac or an armv8 based phone.
#elif CRILL_ARM_32BIT
impl::progressive_backoff_wait_armv7<2, 7100>(std::forward<Predicate>(pred));
// approx. 2x10 ns (= 20 ns) and 7100x140 ns (~ 1 ms), respectively, when
// measured on an LG K32
#else
#error "Platform not supported!"
#endif
Expand Down