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92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include "common/common_types.h"
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#include "common/logging/log.h"
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#include "core/hle/kernel/address_arbiter.h"
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#include "core/hle/kernel/thread.h"
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#include "core/memory.h"
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// Kernel namespace
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namespace Kernel {
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AddressArbiter::AddressArbiter() {}
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AddressArbiter::~AddressArbiter() {}
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SharedPtr<AddressArbiter> AddressArbiter::Create(std::string name) {
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SharedPtr<AddressArbiter> address_arbiter(new AddressArbiter);
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address_arbiter->name = std::move(name);
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return address_arbiter;
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}
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ResultCode AddressArbiter::ArbitrateAddress(ArbitrationType type, VAddr address, s32 value,
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u64 nanoseconds) {
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switch (type) {
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// Signal thread(s) waiting for arbitrate address...
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case ArbitrationType::Signal:
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// Negative value means resume all threads
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if (value < 0) {
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ArbitrateAllThreads(address);
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} else {
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// Resume first N threads
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for (int i = 0; i < value; i++)
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ArbitrateHighestPriorityThread(address);
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}
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break;
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// Wait current thread (acquire the arbiter)...
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case ArbitrationType::WaitIfLessThan:
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if ((s32)Memory::Read32(address) < value) {
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Kernel::WaitCurrentThread_ArbitrateAddress(address);
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}
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break;
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case ArbitrationType::WaitIfLessThanWithTimeout:
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if ((s32)Memory::Read32(address) < value) {
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Kernel::WaitCurrentThread_ArbitrateAddress(address);
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GetCurrentThread()->WakeAfterDelay(nanoseconds);
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}
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break;
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case ArbitrationType::DecrementAndWaitIfLessThan: {
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s32 memory_value = Memory::Read32(address);
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if (memory_value < value) {
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// Only change the memory value if the thread should wait
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Memory::Write32(address, (s32)memory_value - 1);
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Kernel::WaitCurrentThread_ArbitrateAddress(address);
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}
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break;
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}
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case ArbitrationType::DecrementAndWaitIfLessThanWithTimeout: {
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s32 memory_value = Memory::Read32(address);
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if (memory_value < value) {
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// Only change the memory value if the thread should wait
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Memory::Write32(address, (s32)memory_value - 1);
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Kernel::WaitCurrentThread_ArbitrateAddress(address);
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GetCurrentThread()->WakeAfterDelay(nanoseconds);
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}
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break;
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}
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default:
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LOG_ERROR(Kernel, "unknown type=%d", type);
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return ResultCode(ErrorDescription::InvalidEnumValue, ErrorModule::Kernel,
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ErrorSummary::WrongArgument, ErrorLevel::Usage);
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}
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// The calls that use a timeout seem to always return a Timeout error even if they did not put
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// the thread to sleep
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if (type == ArbitrationType::WaitIfLessThanWithTimeout ||
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type == ArbitrationType::DecrementAndWaitIfLessThanWithTimeout) {
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return ResultCode(ErrorDescription::Timeout, ErrorModule::OS, ErrorSummary::StatusChanged,
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ErrorLevel::Info);
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}
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return RESULT_SUCCESS;
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}
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} // namespace Kernel
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