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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <boost/serialization/base_object.hpp>
#include <boost/serialization/shared_ptr.hpp>
#include <boost/serialization/string.hpp>
#include <boost/serialization/vector.hpp>
#include "common/archives.h"
#include "common/common_types.h"
#include "common/logging/log.h"
#include "core/hle/kernel/address_arbiter.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/hle/kernel/thread.h"
#include "core/memory.h"
SERIALIZE_EXPORT_IMPL(Kernel::AddressArbiter)
SERIALIZE_EXPORT_IMPL(Kernel::AddressArbiter::Callback)
namespace Kernel {
void AddressArbiter::WaitThread(std::shared_ptr<Thread> thread, VAddr wait_address) {
thread->wait_address = wait_address;
thread->status = ThreadStatus::WaitArb;
waiting_threads.emplace_back(std::move(thread));
}
u64 AddressArbiter::ResumeAllThreads(VAddr address) {
// Determine which threads are waiting on this address, those should be woken up.
auto itr = std::stable_partition(waiting_threads.begin(), waiting_threads.end(),
[address](const auto& thread) {
ASSERT_MSG(thread->status == ThreadStatus::WaitArb,
"Inconsistent AddressArbiter state");
return thread->wait_address != address;
});
// Wake up all the found threads
const u64 num_threads = std::distance(itr, waiting_threads.end());
std::for_each(itr, waiting_threads.end(), [](auto& thread) { thread->ResumeFromWait(); });
// Remove the woken up threads from the wait list.
waiting_threads.erase(itr, waiting_threads.end());
return num_threads;
}
bool AddressArbiter::ResumeHighestPriorityThread(VAddr address) {
// Determine which threads are waiting on this address, those should be considered for wakeup.
auto matches_start = std::stable_partition(
waiting_threads.begin(), waiting_threads.end(), [address](const auto& thread) {
ASSERT_MSG(thread->status == ThreadStatus::WaitArb,
"Inconsistent AddressArbiter state");
return thread->wait_address != address;
});
// Iterate through threads, find highest priority thread that is waiting to be arbitrated.
// Note: The real kernel will pick the first thread in the list if more than one have the
// same highest priority value. Lower priority values mean higher priority.
auto itr = std::min_element(matches_start, waiting_threads.end(),
[](const auto& lhs, const auto& rhs) {
return lhs->current_priority < rhs->current_priority;
});
if (itr == waiting_threads.end()) {
return false;
}
auto thread = *itr;
thread->ResumeFromWait();
waiting_threads.erase(itr);
return true;
}
AddressArbiter::AddressArbiter(KernelSystem& kernel)
: Object(kernel), kernel(kernel), timeout_callback(std::make_shared<Callback>(*this)) {}
AddressArbiter::~AddressArbiter() {
if (resource_limit) {
resource_limit->Release(ResourceLimitType::AddressArbiter, 1);
}
}
std::shared_ptr<AddressArbiter> KernelSystem::CreateAddressArbiter(std::string name) {
auto address_arbiter = std::make_shared<AddressArbiter>(*this);
address_arbiter->name = std::move(name);
return address_arbiter;
}
class AddressArbiter::Callback : public WakeupCallback {
public:
explicit Callback(AddressArbiter& _parent) : parent(_parent) {}
AddressArbiter& parent;
void WakeUp(ThreadWakeupReason reason, std::shared_ptr<Thread> thread,
std::shared_ptr<WaitObject> object) override {
parent.WakeUp(reason, std::move(thread), std::move(object));
}
private:
template <class Archive>
void serialize(Archive& ar, const unsigned int) {
ar& boost::serialization::base_object<WakeupCallback>(*this);
}
friend class boost::serialization::access;
};
void AddressArbiter::WakeUp(ThreadWakeupReason reason, std::shared_ptr<Thread> thread,
std::shared_ptr<WaitObject> object) {
ASSERT(reason == ThreadWakeupReason::Timeout);
// Remove the newly-awakened thread from the Arbiter's waiting list.
waiting_threads.erase(std::remove(waiting_threads.begin(), waiting_threads.end(), thread),
waiting_threads.end());
};
Result AddressArbiter::ArbitrateAddress(std::shared_ptr<Thread> thread, ArbitrationType type,
VAddr address, s32 value, u64 nanoseconds) {
switch (type) {
// Signal thread(s) waiting for arbitrate address...
case ArbitrationType::Signal: {
u64 num_threads{};
// Negative value means resume all threads
if (value < 0) {
num_threads = ResumeAllThreads(address);
} else {
// Resume first N threads
for (s32 i = 0; i < value; i++) {
num_threads += ResumeHighestPriorityThread(address);
}
}
// Prevents lag from low priority threads that spam svcArbitrateAddress and wake no threads
// The tick count is taken directly from official HOS kernel. The priority value is one less
// than official kernel as the affected FMV threads dont meet the priority threshold of 50.
// TODO: Revisit this when scheduler is rewritten and adjust if there isn't a problem there.
if (num_threads == 0 && thread->current_priority >= 49) {
kernel.current_cpu->GetTimer().AddTicks(1614u);
}
break;
}
// Wait current thread (acquire the arbiter)...
case ArbitrationType::WaitIfLessThan:
if ((s32)kernel.memory.Read32(address) < value) {
WaitThread(std::move(thread), address);
}
break;
case ArbitrationType::WaitIfLessThanWithTimeout:
if ((s32)kernel.memory.Read32(address) < value) {
thread->wakeup_callback = timeout_callback;
thread->WakeAfterDelay(nanoseconds);
WaitThread(std::move(thread), address);
}
break;
case ArbitrationType::DecrementAndWaitIfLessThan: {
s32 memory_value = kernel.memory.Read32(address);
if (memory_value < value) {
// Only change the memory value if the thread should wait
kernel.memory.Write32(address, (s32)memory_value - 1);
WaitThread(std::move(thread), address);
}
break;
}
case ArbitrationType::DecrementAndWaitIfLessThanWithTimeout: {
s32 memory_value = kernel.memory.Read32(address);
if (memory_value < value) {
// Only change the memory value if the thread should wait
kernel.memory.Write32(address, (s32)memory_value - 1);
thread->wakeup_callback = timeout_callback;
thread->WakeAfterDelay(nanoseconds);
WaitThread(std::move(thread), address);
}
break;
}
default:
LOG_ERROR(Kernel, "unknown type={}", type);
return ResultInvalidEnumValueFnd;
}
// The calls that use a timeout seem to always return a Timeout error even if they did not put
// the thread to sleep
if (type == ArbitrationType::WaitIfLessThanWithTimeout ||
type == ArbitrationType::DecrementAndWaitIfLessThanWithTimeout) {
return ResultTimeout;
}
return ResultSuccess;
}
template <class Archive>
void AddressArbiter::serialize(Archive& ar, const unsigned int) {
ar& boost::serialization::base_object<Object>(*this);
ar& name;
ar& waiting_threads;
ar& timeout_callback;
ar& resource_limit;
}
SERIALIZE_IMPL(AddressArbiter)
} // namespace Kernel
namespace boost::serialization {
template <class Archive>
void save_construct_data(Archive& ar, const Kernel::AddressArbiter::Callback* t,
const unsigned int) {
ar << Kernel::SharedFrom(&t->parent);
}
template <class Archive>
void load_construct_data(Archive& ar, Kernel::AddressArbiter::Callback* t, const unsigned int) {
std::shared_ptr<Kernel::AddressArbiter> parent;
ar >> parent;
::new (t) Kernel::AddressArbiter::Callback(*parent);
}
} // namespace boost::serialization
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