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8634b8cb83
Threads will now be awakened when the objects they're waiting on are signaled, instead of repeating the WaitSynchronization call every now and then. The scheduler is now called once after every SVC call, and once after a thread is awakened from sleep by its timeout callback. This new implementation is based off reverse-engineering of the real kernel. See https://gist.github.com/Subv/02f29bd9f1e5deb7aceea1e8f019c8f4 for a more detailed description of how the real kernel handles rescheduling.
94 lines
3.2 KiB
C++
94 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/hle.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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