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mark up performance counter operations as noexcept

This commit is contained in:
arvidn 2018-01-06 18:20:59 +01:00 committed by Arvid Norberg
parent 88643dd121
commit 39144201db
2 changed files with 22 additions and 17 deletions
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19
include/libtorrent/performance_counters.hpp
View File

@ -456,18 +456,23 @@ namespace libtorrent {
num_counters,
num_gauges_counters = num_counters - num_stats_counters
};
#ifdef ATOMIC_LLONG_LOCK_FREE
#define TORRENT_COUNTER_NOEXCEPT noexcept
#else
#define TORRENT_COUNTER_NOEXCEPT
#endif
counters();
counters() TORRENT_COUNTER_NOEXCEPT;
counters(counters const&);
counters& operator=(counters const&);
counters(counters const&) TORRENT_COUNTER_NOEXCEPT;
counters& operator=(counters const&) TORRENT_COUNTER_NOEXCEPT;
// returns the new value
std::int64_t inc_stats_counter(int c, std::int64_t value = 1);
std::int64_t operator[](int i) const;
std::int64_t inc_stats_counter(int c, std::int64_t value = 1) TORRENT_COUNTER_NOEXCEPT;
std::int64_t operator[](int i) const TORRENT_COUNTER_NOEXCEPT;
void set_value(int c, std::int64_t value);
void blend_stats_counter(int c, std::int64_t value, int ratio);
void set_value(int c, std::int64_t value) TORRENT_COUNTER_NOEXCEPT;
void blend_stats_counter(int c, std::int64_t value, int ratio) TORRENT_COUNTER_NOEXCEPT;
private:

20
src/performance_counters.cpp
View File

@ -36,17 +36,17 @@ POSSIBILITY OF SUCH DAMAGE.
namespace libtorrent {
counters::counters()
counters::counters() TORRENT_COUNTER_NOEXCEPT
{
#ifdef ATOMIC_LLONG_LOCK_FREE
for (auto& counter : m_stats_counter)
counter.store(0, std::memory_order_relaxed);
#else
std::memset(m_stats_counter, 0, sizeof(m_stats_counter));
m_stats_counter.fill(0);
#endif
}
counters::counters(counters const& c)
counters::counters(counters const& c) TORRENT_COUNTER_NOEXCEPT
{
#ifdef ATOMIC_LLONG_LOCK_FREE
for (int i = 0; i < m_stats_counter.end_index(); ++i)
@ -55,11 +55,11 @@ namespace libtorrent {
, std::memory_order_relaxed);
#else
std::lock_guard<std::mutex> l(c.m_mutex);
std::memcpy(m_stats_counter, c.m_stats_counter, sizeof(m_stats_counter));
m_stats_counter = c.m_stats_counter;
#endif
}
counters& counters::operator=(counters const& c)
counters& counters::operator=(counters const& c) TORRENT_COUNTER_NOEXCEPT
{
if (&c == this) return *this;
#ifdef ATOMIC_LLONG_LOCK_FREE
@ -70,12 +70,12 @@ namespace libtorrent {
#else
std::lock_guard<std::mutex> l(m_mutex);
std::lock_guard<std::mutex> l2(c.m_mutex);
std::memcpy(m_stats_counter, c.m_stats_counter, sizeof(m_stats_counter));
m_stats_counter = c.m_stats_counter;
#endif
return *this;
}
std::int64_t counters::operator[](int i) const
std::int64_t counters::operator[](int i) const TORRENT_COUNTER_NOEXCEPT
{
TORRENT_ASSERT(i >= 0);
TORRENT_ASSERT(i < num_counters);
@ -90,7 +90,7 @@ namespace libtorrent {
// the argument specifies which counter to
// increment or decrement
std::int64_t counters::inc_stats_counter(int const c, std::int64_t const value)
std::int64_t counters::inc_stats_counter(int const c, std::int64_t const value) TORRENT_COUNTER_NOEXCEPT
{
// if c >= num_stats_counters, it means it's not
// a monotonically increasing counter, but a gauge
@ -112,7 +112,7 @@ namespace libtorrent {
// ratio is a value between 0 and 100 representing the percentage the value
// is blended in at.
void counters::blend_stats_counter(int const c, std::int64_t const value, int const ratio)
void counters::blend_stats_counter(int const c, std::int64_t const value, int const ratio) TORRENT_COUNTER_NOEXCEPT
{
TORRENT_ASSERT(c >= num_stats_counters);
TORRENT_ASSERT(c < num_counters);
@ -135,7 +135,7 @@ namespace libtorrent {
#endif
}
void counters::set_value(int const c, std::int64_t const value)
void counters::set_value(int const c, std::int64_t const value) TORRENT_COUNTER_NOEXCEPT
{
TORRENT_ASSERT(c >= 0);
TORRENT_ASSERT(c < num_counters);