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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/assert.h"
#include "common/common_funcs.h"
#include "common/common_types.h"
#include "core/core.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/lock.h"
#include "core/memory.h"
namespace Kernel {
namespace AddressArbiter {
// Performs actual address waiting logic.
ResultCode WaitForAddress(VAddr address, s64 timeout) {
SharedPtr<Thread> current_thread = GetCurrentThread();
current_thread->arb_wait_address = address;
current_thread->arb_wait_result = RESULT_TIMEOUT;
current_thread->status = THREADSTATUS_WAIT_ARB;
current_thread->wakeup_callback = nullptr;
current_thread->WakeAfterDelay(timeout);
Core::System::GetInstance().CpuCore(current_thread->processor_id).PrepareReschedule();
return RESULT_SUCCESS;
}
// Signals an address being waited on.
ResultCode SignalToAddress(VAddr address, s32 value, s32 num_to_wake) {
// TODO
return RESULT_SUCCESS;
}
// Signals an address being waited on and increments its value if equal to the value argument.
ResultCode IncrementAndSignalToAddressIfEqual(VAddr address, s32 value, s32 num_to_wake) {
// TODO
return RESULT_SUCCESS;
}
// Signals an address being waited on and modifies its value based on waiting thread count if equal to the value argument.
ResultCode ModifyByWaitingCountAndSignalToAddressIfEqual(VAddr address, s32 value, s32 num_to_wake) {
// TODO
return RESULT_SUCCESS;
}
// Waits on an address if the value passed is less than the argument value, optionally decrementing.
ResultCode WaitForAddressIfLessThan(VAddr address, s32 value, s64 timeout, bool should_decrement) {
// Ensure that we can read the address.
if (!Memory::IsValidVirtualAddress(address)) {
return ERR_INVALID_ADDRESS_STATE;
}
s32 cur_value;
// Get value, decrementing if less than
{
// Decrement if less than must be an atomic operation.
std::lock_guard<std::recursive_mutex> lock(HLE::g_hle_lock);
cur_value = (s32)Memory::Read32(address);
if (cur_value < value) {
Memory::Write32(address, (u32)(cur_value - 1));
}
}
if (cur_value >= value) {
return ERR_INVALID_STATE;
}
// Short-circuit without rescheduling, if timeout is zero.
if (timeout == 0) {
return RESULT_TIMEOUT;
}
return WaitForAddress(address, timeout);
}
// Waits on an address if the value passed is equal to the argument value.
ResultCode WaitForAddressIfEqual(VAddr address, s32 value, s64 timeout) {
// Ensure that we can read the address.
if (!Memory::IsValidVirtualAddress(address)) {
return ERR_INVALID_ADDRESS_STATE;
}
// Only wait for the address if equal.
if ((s32)Memory::Read32(address) != value) {
return ERR_INVALID_STATE;
}
// Short-circuit without rescheduling, if timeout is zero.
if (timeout == 0) {
return RESULT_TIMEOUT;
}
return WaitForAddress(address, timeout);
}
} // namespace AddressArbiter
} // namespace Kernel
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