From 555cd26ec2b848634370a14d41b7e79b6c6beecd Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Thu, 14 Mar 2019 00:29:54 -0400
Subject: [PATCH 1/2] core/hle/kernel: Make Mutex a per-process class.
Makes it an instantiable class like it is in the actual kernel. This
will also allow removing reliance on global accessors in a following
change, now that we can encapsulate a reference to the system instance
in the class.
---
src/core/hle/kernel/mutex.cpp | 9 +++++++--
src/core/hle/kernel/mutex.h | 20 +++++++++++---------
src/core/hle/kernel/process.cpp | 3 ++-
src/core/hle/kernel/process.h | 16 ++++++++++++++++
src/core/hle/kernel/svc.cpp | 17 +++++++++++------
5 files changed, 47 insertions(+), 18 deletions(-)
diff --git a/src/core/hle/kernel/mutex.cpp b/src/core/hle/kernel/mutex.cpp
index 0743670ad..260e25fde 100644
--- a/src/core/hle/kernel/mutex.cpp
+++ b/src/core/hle/kernel/mutex.cpp
@@ -2,7 +2,6 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
-#include <map>
#include <utility>
#include <vector>
@@ -10,8 +9,10 @@
#include "core/core.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/handle_table.h"
+#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/mutex.h"
#include "core/hle/kernel/object.h"
+#include "core/hle/kernel/process.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/result.h"
#include "core/memory.h"
@@ -57,13 +58,17 @@ static void TransferMutexOwnership(VAddr mutex_addr, SharedPtr<Thread> current_t
}
}
-ResultCode Mutex::TryAcquire(HandleTable& handle_table, VAddr address, Handle holding_thread_handle,
+Mutex::Mutex(Core::System& system) : system{system} {}
+Mutex::~Mutex() = default;
+
+ResultCode Mutex::TryAcquire(VAddr address, Handle holding_thread_handle,
Handle requesting_thread_handle) {
// The mutex address must be 4-byte aligned
if ((address % sizeof(u32)) != 0) {
return ERR_INVALID_ADDRESS;
}
+ const auto& handle_table = system.Kernel().CurrentProcess()->GetHandleTable();
SharedPtr<Thread> holding_thread = handle_table.Get<Thread>(holding_thread_handle);
SharedPtr<Thread> requesting_thread = handle_table.Get<Thread>(requesting_thread_handle);
diff --git a/src/core/hle/kernel/mutex.h b/src/core/hle/kernel/mutex.h
index 81e62d497..b904de2e8 100644
--- a/src/core/hle/kernel/mutex.h
+++ b/src/core/hle/kernel/mutex.h
@@ -5,32 +5,34 @@
#pragma once
#include "common/common_types.h"
-#include "core/hle/kernel/object.h"
union ResultCode;
-namespace Kernel {
+namespace Core {
+class System;
+}
-class HandleTable;
-class Thread;
+namespace Kernel {
class Mutex final {
public:
+ explicit Mutex(Core::System& system);
+ ~Mutex();
+
/// Flag that indicates that a mutex still has threads waiting for it.
static constexpr u32 MutexHasWaitersFlag = 0x40000000;
/// Mask of the bits in a mutex address value that contain the mutex owner.
static constexpr u32 MutexOwnerMask = 0xBFFFFFFF;
/// Attempts to acquire a mutex at the specified address.
- static ResultCode TryAcquire(HandleTable& handle_table, VAddr address,
- Handle holding_thread_handle, Handle requesting_thread_handle);
+ ResultCode TryAcquire(VAddr address, Handle holding_thread_handle,
+ Handle requesting_thread_handle);
/// Releases the mutex at the specified address.
- static ResultCode Release(VAddr address);
+ ResultCode Release(VAddr address);
private:
- Mutex() = default;
- ~Mutex() = default;
+ Core::System& system;
};
} // namespace Kernel
diff --git a/src/core/hle/kernel/process.cpp b/src/core/hle/kernel/process.cpp
index 49fced7b1..406808ce9 100644
--- a/src/core/hle/kernel/process.cpp
+++ b/src/core/hle/kernel/process.cpp
@@ -231,7 +231,8 @@ void Process::LoadModule(CodeSet module_, VAddr base_addr) {
}
Process::Process(Core::System& system)
- : WaitObject{system.Kernel()}, address_arbiter{system}, system{system} {}
+ : WaitObject{system.Kernel()}, address_arbiter{system}, mutex{system}, system{system} {}
+
Process::~Process() = default;
void Process::Acquire(Thread* thread) {
diff --git a/src/core/hle/kernel/process.h b/src/core/hle/kernel/process.h
index 47ffd4ad3..5e72300b6 100644
--- a/src/core/hle/kernel/process.h
+++ b/src/core/hle/kernel/process.h
@@ -14,6 +14,7 @@
#include "common/common_types.h"
#include "core/hle/kernel/address_arbiter.h"
#include "core/hle/kernel/handle_table.h"
+#include "core/hle/kernel/mutex.h"
#include "core/hle/kernel/process_capability.h"
#include "core/hle/kernel/vm_manager.h"
#include "core/hle/kernel/wait_object.h"
@@ -165,6 +166,16 @@ public:
return address_arbiter;
}
+ /// Gets a reference to the process' mutex lock.
+ Mutex& GetMutex() {
+ return mutex;
+ }
+
+ /// Gets a const reference to the process' mutex lock
+ const Mutex& GetMutex() const {
+ return mutex;
+ }
+
/// Gets the current status of the process
ProcessStatus GetStatus() const {
return status;
@@ -327,6 +338,11 @@ private:
/// Per-process address arbiter.
AddressArbiter address_arbiter;
+ /// The per-process mutex lock instance used for handling various
+ /// forms of services, such as lock arbitration, and condition
+ /// variable related facilities.
+ Mutex mutex;
+
/// Random values for svcGetInfo RandomEntropy
std::array<u64, RANDOM_ENTROPY_SIZE> random_entropy;
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp
index 77d0e3d96..599609944 100644
--- a/src/core/hle/kernel/svc.cpp
+++ b/src/core/hle/kernel/svc.cpp
@@ -551,9 +551,9 @@ static ResultCode ArbitrateLock(Handle holding_thread_handle, VAddr mutex_addr,
return ERR_INVALID_ADDRESS;
}
- auto& handle_table = Core::CurrentProcess()->GetHandleTable();
- return Mutex::TryAcquire(handle_table, mutex_addr, holding_thread_handle,
- requesting_thread_handle);
+ auto* const current_process = Core::System::GetInstance().Kernel().CurrentProcess();
+ return current_process->GetMutex().TryAcquire(mutex_addr, holding_thread_handle,
+ requesting_thread_handle);
}
/// Unlock a mutex
@@ -571,7 +571,8 @@ static ResultCode ArbitrateUnlock(VAddr mutex_addr) {
return ERR_INVALID_ADDRESS;
}
- return Mutex::Release(mutex_addr);
+ auto* const current_process = Core::System::GetInstance().Kernel().CurrentProcess();
+ return current_process->GetMutex().Release(mutex_addr);
}
enum class BreakType : u32 {
@@ -1336,11 +1337,15 @@ static ResultCode WaitProcessWideKeyAtomic(VAddr mutex_addr, VAddr condition_var
"called mutex_addr={:X}, condition_variable_addr={:X}, thread_handle=0x{:08X}, timeout={}",
mutex_addr, condition_variable_addr, thread_handle, nano_seconds);
- const auto& handle_table = Core::CurrentProcess()->GetHandleTable();
+ auto* const current_process = Core::System::GetInstance().Kernel().CurrentProcess();
+ const auto& handle_table = current_process->GetHandleTable();
SharedPtr<Thread> thread = handle_table.Get<Thread>(thread_handle);
ASSERT(thread);
- CASCADE_CODE(Mutex::Release(mutex_addr));
+ const auto release_result = current_process->GetMutex().Release(mutex_addr);
+ if (release_result.IsError()) {
+ return release_result;
+ }
SharedPtr<Thread> current_thread = GetCurrentThread();
current_thread->SetCondVarWaitAddress(condition_variable_addr);
From d71cad6ed054374ae750ee9537ea821733af4db9 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Thu, 14 Mar 2019 00:56:04 -0400
Subject: [PATCH 2/2] core/hle/kernel/mutex: Remove usages of global system
accessors
Removes the use of global system accessors, and instead uses the
explicit interface provided.
---
src/core/hle/kernel/mutex.cpp | 26 +++++++++++++++-----------
1 file changed, 15 insertions(+), 11 deletions(-)
diff --git a/src/core/hle/kernel/mutex.cpp b/src/core/hle/kernel/mutex.cpp
index 260e25fde..98e87313b 100644
--- a/src/core/hle/kernel/mutex.cpp
+++ b/src/core/hle/kernel/mutex.cpp
@@ -13,6 +13,7 @@
#include "core/hle/kernel/mutex.h"
#include "core/hle/kernel/object.h"
#include "core/hle/kernel/process.h"
+#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/result.h"
#include "core/memory.h"
@@ -69,34 +70,36 @@ ResultCode Mutex::TryAcquire(VAddr address, Handle holding_thread_handle,
}
const auto& handle_table = system.Kernel().CurrentProcess()->GetHandleTable();
+ Thread* const current_thread = system.CurrentScheduler().GetCurrentThread();
SharedPtr<Thread> holding_thread = handle_table.Get<Thread>(holding_thread_handle);
SharedPtr<Thread> requesting_thread = handle_table.Get<Thread>(requesting_thread_handle);
// TODO(Subv): It is currently unknown if it is possible to lock a mutex in behalf of another
// thread.
- ASSERT(requesting_thread == GetCurrentThread());
+ ASSERT(requesting_thread == current_thread);
- u32 addr_value = Memory::Read32(address);
+ const u32 addr_value = Memory::Read32(address);
// If the mutex isn't being held, just return success.
if (addr_value != (holding_thread_handle | Mutex::MutexHasWaitersFlag)) {
return RESULT_SUCCESS;
}
- if (holding_thread == nullptr)
+ if (holding_thread == nullptr) {
return ERR_INVALID_HANDLE;
+ }
// Wait until the mutex is released
- GetCurrentThread()->SetMutexWaitAddress(address);
- GetCurrentThread()->SetWaitHandle(requesting_thread_handle);
+ current_thread->SetMutexWaitAddress(address);
+ current_thread->SetWaitHandle(requesting_thread_handle);
- GetCurrentThread()->SetStatus(ThreadStatus::WaitMutex);
- GetCurrentThread()->InvalidateWakeupCallback();
+ current_thread->SetStatus(ThreadStatus::WaitMutex);
+ current_thread->InvalidateWakeupCallback();
// Update the lock holder thread's priority to prevent priority inversion.
- holding_thread->AddMutexWaiter(GetCurrentThread());
+ holding_thread->AddMutexWaiter(current_thread);
- Core::System::GetInstance().PrepareReschedule();
+ system.PrepareReschedule();
return RESULT_SUCCESS;
}
@@ -107,7 +110,8 @@ ResultCode Mutex::Release(VAddr address) {
return ERR_INVALID_ADDRESS;
}
- auto [thread, num_waiters] = GetHighestPriorityMutexWaitingThread(GetCurrentThread(), address);
+ auto* const current_thread = system.CurrentScheduler().GetCurrentThread();
+ auto [thread, num_waiters] = GetHighestPriorityMutexWaitingThread(current_thread, address);
// There are no more threads waiting for the mutex, release it completely.
if (thread == nullptr) {
@@ -116,7 +120,7 @@ ResultCode Mutex::Release(VAddr address) {
}
// Transfer the ownership of the mutex from the previous owner to the new one.
- TransferMutexOwnership(address, GetCurrentThread(), thread);
+ TransferMutexOwnership(address, current_thread, thread);
u32 mutex_value = thread->GetWaitHandle();