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TSX: Improve cpu_thread::suspend_all implementation

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Implement low_lock and vip_lock (for shared_mutex).
Try to simplify suspend_all implementation with updated shared_mutex.
This commit is contained in:
Nekotekina 2019-07-23 00:37:35 +03:00
parent 49aefc0795
commit 090c71aa7c
4 changed files with 226 additions and 52 deletions
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93
Utilities/mutex.cpp
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@ -42,6 +42,84 @@ void shared_mutex::imp_unlock_shared(u32 old)
}
}
void shared_mutex::imp_lock_low(u32 val)
{
verify("shared_mutex underflow" HERE), val < c_err;
for (int i = 0; i < 10; i++)
{
busy_wait();
if (try_lock_low())
{
return;
}
}
// Acquire writer lock and downgrade
const u32 old = m_value.fetch_add(c_one);
if (old == 0)
{
lock_downgrade();
return;
}
verify("shared_mutex overflow" HERE), (old % c_sig) + c_one < c_sig;
imp_wait();
lock_downgrade();
}
void shared_mutex::imp_unlock_low(u32 old)
{
verify("shared_mutex underflow" HERE), old - 1 < c_err;
// Check reader count, notify the writer if necessary
if ((old - 1) % c_vip == 0)
{
imp_signal();
}
}
void shared_mutex::imp_lock_vip(u32 val)
{
verify("shared_mutex underflow" HERE), val < c_err;
for (int i = 0; i < 10; i++)
{
busy_wait();
if (try_lock_vip())
{
return;
}
}
// Acquire writer lock and downgrade
const u32 old = m_value.fetch_add(c_one);
if (old == 0)
{
lock_downgrade_to_vip();
return;
}
verify("shared_mutex overflow" HERE), (old % c_sig) + c_one < c_sig;
imp_wait();
lock_downgrade_to_vip();
}
void shared_mutex::imp_unlock_vip(u32 old)
{
verify("shared_mutex underflow" HERE), old - 1 < c_err;
// Check reader count, notify the writer if necessary
if ((old - 1) % c_one / c_vip == 0)
{
imp_signal();
}
}
void shared_mutex::imp_wait()
{
while (!balanced_wait_until(m_value, -1, [&](u32& value, auto...)
@ -158,3 +236,18 @@ void shared_mutex::imp_lock_unlock()
imp_wait();
unlock();
}
bool shared_mutex::downgrade_unique_vip_lock_to_low_or_unlock()
{
return m_value.atomic_op([](u32& value)
{
if (value % c_one / c_vip == 1)
{
value -= c_vip - 1;
return true;
}
value -= c_vip;
return false;
});
}