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modify latch API to match std::experimental #13

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modify latch API to match std::experimental #13

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7 changes: 7 additions & 0 deletions include/ecst/utils/cv_operations/cv_operations.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,13 @@ ECST_NAMESPACE
},
FWD(f));
}

void wait_counter(
mutex_type& mutex, cv_type& cv, counter_type& c) noexcept
{
unique_lock_type l(mutex);
cv.wait(l, [&c]{ return c == 0; });
}
}
}
ECST_NAMESPACE_END
4 changes: 4 additions & 0 deletions include/ecst/utils/cv_operations/latch.hpp
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Expand Up @@ -23,6 +23,8 @@ ECST_NAMESPACE
/// @brief Constructs a latch with `initial_count` counter value.
latch(impl::counter_inner_type initial_count) noexcept;

void count_down() noexcept;

/// @brief Decrements the counter and notifies one thread waiting on the
/// `condition_variable`.
/// @details Asserts `_counter` to be greater than zero.
Expand All @@ -39,6 +41,8 @@ ECST_NAMESPACE
/// will decrement the counter to zero.
template <typename TF>
void execute_and_wait_until_zero(TF&& f) noexcept(noexcept(f()));

void wait() noexcept;
};
}
ECST_NAMESPACE_END
9 changes: 9 additions & 0 deletions include/ecst/utils/cv_operations/latch.inl
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Expand Up @@ -16,6 +16,11 @@ ECST_NAMESPACE
{
}

void latch::count_down() noexcept
{
--_counter;
}

void latch::decrement_and_notify_one() noexcept
{
impl::decrement_cv_counter_and_notify_one(_mutex, _cv, _counter);
Expand All @@ -33,5 +38,9 @@ ECST_NAMESPACE
impl::execute_and_wait_until_counter_zero(
_mutex, _cv, _counter, FWD(f));
}

void latch::wait() noexcept {
impl::wait_counter(_mutex, _cv, _counter);
}
}
ECST_NAMESPACE_END