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kernel/thread: Maintain priority ordering of added mutex waiting threads
The kernel keeps the internal waiting list ordered by priority. This is trivial to do with std::find_if followed by an insertion.
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3bfd199497
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0b78cfcc53
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@ -7,8 +7,6 @@
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#include <optional>
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#include <optional>
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#include <vector>
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#include <vector>
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#include <boost/range/algorithm_ext/erase.hpp>
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#include "common/assert.h"
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "common/common_types.h"
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#include "common/logging/log.h"
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#include "common/logging/log.h"
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@ -269,8 +267,8 @@ void Thread::AddMutexWaiter(SharedPtr<Thread> thread) {
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if (thread->lock_owner == this) {
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if (thread->lock_owner == this) {
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// If the thread is already waiting for this thread to release the mutex, ensure that the
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// If the thread is already waiting for this thread to release the mutex, ensure that the
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// waiters list is consistent and return without doing anything.
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// waiters list is consistent and return without doing anything.
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auto itr = std::find(wait_mutex_threads.begin(), wait_mutex_threads.end(), thread);
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const auto iter = std::find(wait_mutex_threads.begin(), wait_mutex_threads.end(), thread);
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ASSERT(itr != wait_mutex_threads.end());
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ASSERT(iter != wait_mutex_threads.end());
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return;
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return;
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}
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}
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@ -278,11 +276,16 @@ void Thread::AddMutexWaiter(SharedPtr<Thread> thread) {
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ASSERT(thread->lock_owner == nullptr);
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ASSERT(thread->lock_owner == nullptr);
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// Ensure that the thread is not already in the list of mutex waiters
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// Ensure that the thread is not already in the list of mutex waiters
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auto itr = std::find(wait_mutex_threads.begin(), wait_mutex_threads.end(), thread);
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const auto iter = std::find(wait_mutex_threads.begin(), wait_mutex_threads.end(), thread);
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ASSERT(itr == wait_mutex_threads.end());
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ASSERT(iter == wait_mutex_threads.end());
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// Keep the list in an ordered fashion
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const auto insertion_point = std::find_if(
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wait_mutex_threads.begin(), wait_mutex_threads.end(),
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[&thread](const auto& entry) { return entry->GetPriority() > thread->GetPriority(); });
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wait_mutex_threads.insert(insertion_point, thread);
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thread->lock_owner = this;
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thread->lock_owner = this;
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wait_mutex_threads.emplace_back(std::move(thread));
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UpdatePriority();
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UpdatePriority();
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}
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}
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@ -290,10 +293,11 @@ void Thread::RemoveMutexWaiter(SharedPtr<Thread> thread) {
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ASSERT(thread->lock_owner == this);
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ASSERT(thread->lock_owner == this);
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// Ensure that the thread is in the list of mutex waiters
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// Ensure that the thread is in the list of mutex waiters
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auto itr = std::find(wait_mutex_threads.begin(), wait_mutex_threads.end(), thread);
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const auto iter = std::find(wait_mutex_threads.begin(), wait_mutex_threads.end(), thread);
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ASSERT(itr != wait_mutex_threads.end());
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ASSERT(iter != wait_mutex_threads.end());
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wait_mutex_threads.erase(iter);
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boost::remove_erase(wait_mutex_threads, thread);
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thread->lock_owner = nullptr;
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thread->lock_owner = nullptr;
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UpdatePriority();
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UpdatePriority();
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}
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}
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@ -310,11 +314,17 @@ void Thread::UpdatePriority() {
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return;
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return;
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scheduler->SetThreadPriority(this, new_priority);
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scheduler->SetThreadPriority(this, new_priority);
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current_priority = new_priority;
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current_priority = new_priority;
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if (!lock_owner) {
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return;
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}
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// Ensure that the thread is within the correct location in the waiting list.
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lock_owner->RemoveMutexWaiter(this);
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lock_owner->AddMutexWaiter(this);
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// Recursively update the priority of the thread that depends on the priority of this one.
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// Recursively update the priority of the thread that depends on the priority of this one.
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if (lock_owner)
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lock_owner->UpdatePriority();
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lock_owner->UpdatePriority();
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}
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}
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