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atomic_t<>: extend fetch_op to support cancellation

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Use std::invoke inside atomic_op/fetch_op
Remove op_fetch because it's easily replaced
Add fetch_dec_sat algorithm (conditional decrement)
This commit is contained in:
Nekotekina 2018-09-05 22:28:37 +03:00
parent ed9fb8405b
commit fb5cdf9769
10 changed files with 80 additions and 60 deletions
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2
Utilities/mutex.cpp
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@ -237,7 +237,7 @@ void shared_mutex::imp_lock_degrade()
bool shared_mutex::try_lock_shared()
{
// Conditional decrement
return m_value.fetch_op([](s64& value) { if (value >= c_min) value -= c_min; }) >= c_min;
return m_value.fetch_dec_sat(c_min - 1, c_min) >= c_min;
}
bool shared_mutex::try_lock()