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Kernel: Convert Mutex to not use Handles

This commit is contained in:
Yuri Kunde Schlesner 2015-01-22 23:12:19 -02:00
parent 38e7122f23
commit 882b6fed75
5 changed files with 109 additions and 113 deletions
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131
src/core/hle/kernel/mutex.cpp
View File

@ -13,59 +13,30 @@
namespace Kernel {
class Mutex : public WaitObject {
public:
std::string GetTypeName() const override { return "Mutex"; }
std::string GetName() const override { return name; }
static const HandleType HANDLE_TYPE = HandleType::Mutex;
HandleType GetHandleType() const override { return HANDLE_TYPE; }
bool initial_locked; ///< Initial lock state when mutex was created
bool locked; ///< Current locked state
std::string name; ///< Name of mutex (optional)
SharedPtr<Thread> holding_thread; ///< Thread that has acquired the mutex
bool ShouldWait() override;
void Acquire() override;
};
////////////////////////////////////////////////////////////////////////////////////////////////////
typedef std::multimap<SharedPtr<Thread>, SharedPtr<Mutex>> MutexMap;
static MutexMap g_mutex_held_locks;
/**
* Acquires the specified mutex for the specified thread
* @param mutex Mutex that is to be acquired
* @param thread Thread that will acquire the mutex
*/
static void MutexAcquireLock(Mutex* mutex, Thread* thread) {
g_mutex_held_locks.insert(std::make_pair(thread, mutex));
mutex->holding_thread = thread;
}
/**
* Resumes a thread waiting for the specified mutex
* @param mutex The mutex that some thread is waiting on
*/
static void ResumeWaitingThread(Mutex* mutex) {
// Reset mutex lock thread handle, nothing is waiting
mutex->locked = false;
mutex->holding_thread = nullptr;
// Find the next waiting thread for the mutex...
auto next_thread = mutex->WakeupNextThread();
if (next_thread != nullptr) {
MutexAcquireLock(mutex, next_thread);
} else {
// Reset mutex lock thread handle, nothing is waiting
mutex->locked = false;
mutex->holding_thread = nullptr;
mutex->Acquire(next_thread);
}
}
void ReleaseThreadMutexes(Thread* thread) {
auto locked = g_mutex_held_locks.equal_range(thread);
auto locked_range = g_mutex_held_locks.equal_range(thread);
// Release every mutex that the thread holds, and resume execution on the waiting threads
for (auto iter = locked.first; iter != locked.second; ++iter) {
for (auto iter = locked_range.first; iter != locked_range.second; ++iter) {
ResumeWaitingThread(iter->second.get());
}
@ -73,62 +44,21 @@ void ReleaseThreadMutexes(Thread* thread) {
g_mutex_held_locks.erase(thread);
}
static bool ReleaseMutex(Mutex* mutex) {
if (mutex->locked) {
auto locked = g_mutex_held_locks.equal_range(mutex->holding_thread);
ResultVal<SharedPtr<Mutex>> Mutex::Create(bool initial_locked, std::string name) {
SharedPtr<Mutex> mutex(new Mutex);
// TOOD(yuriks): Don't create Handle (see Thread::Create())
CASCADE_RESULT(auto unused, Kernel::g_handle_table.Create(mutex));
for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) {
if (iter->second == mutex) {
g_mutex_held_locks.erase(iter);
break;
}
}
ResumeWaitingThread(mutex);
}
return true;
}
ResultCode ReleaseMutex(Handle handle) {
Mutex* mutex = Kernel::g_handle_table.Get<Mutex>(handle).get();
if (mutex == nullptr) return InvalidHandle(ErrorModule::Kernel);
if (!ReleaseMutex(mutex)) {
// TODO(yuriks): Verify error code, this one was pulled out of thin air. I'm not even sure
// what error condition this is supposed to be signaling.
return ResultCode(ErrorDescription::AlreadyDone, ErrorModule::Kernel,
ErrorSummary::NothingHappened, ErrorLevel::Temporary);
}
return RESULT_SUCCESS;
}
/**
* Creates a mutex
* @param handle Reference to handle for the newly created mutex
* @param initial_locked Specifies if the mutex should be locked initially
* @param name Optional name of mutex
* @return Pointer to new Mutex object
*/
static Mutex* CreateMutex(Handle& handle, bool initial_locked, const std::string& name) {
Mutex* mutex = new Mutex;
// TODO(yuriks): Fix error reporting
handle = Kernel::g_handle_table.Create(mutex).ValueOr(INVALID_HANDLE);
mutex->locked = mutex->initial_locked = initial_locked;
mutex->name = name;
mutex->initial_locked = initial_locked;
mutex->locked = false;
mutex->name = std::move(name);
mutex->holding_thread = nullptr;
// Acquire mutex with current thread if initialized as locked...
if (mutex->locked)
MutexAcquireLock(mutex, GetCurrentThread());
if (initial_locked)
mutex->Acquire();
return mutex;
}
Handle CreateMutex(bool initial_locked, const std::string& name) {
Handle handle;
Mutex* mutex = CreateMutex(handle, initial_locked, name);
return handle;
return MakeResult<SharedPtr<Mutex>>(mutex);
}
bool Mutex::ShouldWait() {
@ -136,9 +66,34 @@ bool Mutex::ShouldWait() {
}
void Mutex::Acquire() {
Acquire(GetCurrentThread());
}
void Mutex::Acquire(Thread* thread) {
_assert_msg_(Kernel, !ShouldWait(), "object unavailable!");
if (locked)
return;
locked = true;
MutexAcquireLock(this, GetCurrentThread());
g_mutex_held_locks.insert(std::make_pair(thread, this));
holding_thread = thread;
}
void Mutex::Release() {
if (!locked)
return;
auto locked_range = g_mutex_held_locks.equal_range(holding_thread);
for (MutexMap::iterator iter = locked_range.first; iter != locked_range.second; ++iter) {
if (iter->second == this) {
g_mutex_held_locks.erase(iter);
break;
}
}
ResumeWaitingThread(this);
}
} // namespace

50
src/core/hle/kernel/mutex.h
View File

@ -4,25 +4,51 @@
#pragma once
#include <string>
#include "common/common_types.h"
#include "core/hle/kernel/kernel.h"
namespace Kernel {
/**
* Releases a mutex
* @param handle Handle to mutex to release
*/
ResultCode ReleaseMutex(Handle handle);
class Thread;
/**
* Creates a mutex
* @param initial_locked Specifies if the mutex should be locked initially
* @param name Optional name of mutex
* @return Handle to newly created object
*/
Handle CreateMutex(bool initial_locked, const std::string& name="Unknown");
class Mutex : public WaitObject {
public:
/**
* Creates a mutex.
* @param initial_locked Specifies if the mutex should be locked initially
* @param name Optional name of mutex
* @return Pointer to new Mutex object
*/
static ResultVal<SharedPtr<Mutex>> Create(bool initial_locked, std::string name = "Unknown");
std::string GetTypeName() const override { return "Mutex"; }
std::string GetName() const override { return name; }
static const HandleType HANDLE_TYPE = HandleType::Mutex;
HandleType GetHandleType() const override { return HANDLE_TYPE; }
bool initial_locked; ///< Initial lock state when mutex was created
bool locked; ///< Current locked state
std::string name; ///< Name of mutex (optional)
SharedPtr<Thread> holding_thread; ///< Thread that has acquired the mutex
bool ShouldWait() override;
void Acquire() override;
/**
* Acquires the specified mutex for the specified thread
* @param mutex Mutex that is to be acquired
* @param thread Thread that will acquire the mutex
*/
void Acquire(Thread* thread);
void Release();
private:
Mutex() = default;
};
/**
* Releases all the mutexes held by the specified thread

1
src/core/hle/service/apt_s.cpp
View File

@ -10,6 +10,7 @@
#include "core/hle/kernel/event.h"
#include "core/hle/kernel/mutex.h"
#include "core/hle/kernel/shared_memory.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/service/apt_s.h"
////////////////////////////////////////////////////////////////////////////////////////////////////

16
src/core/hle/service/apt_u.cpp
View File

@ -10,6 +10,7 @@
#include "core/hle/kernel/event.h"
#include "core/hle/kernel/mutex.h"
#include "core/hle/kernel/shared_memory.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/service/apt_u.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
@ -28,7 +29,7 @@ static const VAddr SHARED_FONT_VADDR = 0x18000000;
/// Handle to shared memory region designated to for shared system font
static Kernel::SharedPtr<Kernel::SharedMemory> shared_font_mem;
static Handle lock_handle = 0;
static Kernel::SharedPtr<Kernel::Mutex> lock;
static Handle notification_event_handle = 0; ///< APT notification event handle
static Handle pause_event_handle = 0; ///< APT pause event handle
static std::vector<u8> shared_font;
@ -76,8 +77,8 @@ void Initialize(Service::Interface* self) {
Kernel::ClearEvent(notification_event_handle);
Kernel::SignalEvent(pause_event_handle); // Fire start event
_assert_msg_(KERNEL, (0 != lock_handle), "Cannot initialize without lock");
Kernel::ReleaseMutex(lock_handle);
_assert_msg_(KERNEL, (nullptr != lock), "Cannot initialize without lock");
lock->Release();
cmd_buff[1] = RESULT_SUCCESS.raw; // No error
}
@ -103,10 +104,9 @@ void GetLockHandle(Service::Interface* self) {
u32* cmd_buff = Kernel::GetCommandBuffer();
u32 flags = cmd_buff[1]; // TODO(bunnei): Figure out the purpose of the flag field
if (0 == lock_handle) {
if (nullptr == lock) {
// TODO(bunnei): Verify if this is created here or at application boot?
lock_handle = Kernel::CreateMutex(false, "APT_U:Lock");
Kernel::ReleaseMutex(lock_handle);
lock = Kernel::Mutex::Create(false, "APT_U:Lock").MoveFrom();
}
cmd_buff[1] = RESULT_SUCCESS.raw; // No error
@ -116,7 +116,7 @@ void GetLockHandle(Service::Interface* self) {
cmd_buff[3] = 0;
cmd_buff[4] = 0;
cmd_buff[5] = lock_handle;
cmd_buff[5] = Kernel::g_handle_table.Create(lock).MoveFrom();
LOG_TRACE(Service_APT, "called handle=0x%08X", cmd_buff[5]);
}
@ -520,7 +520,7 @@ Interface::Interface() {
shared_font_mem = nullptr;
}
lock_handle = 0;
lock = nullptr;
Register(FunctionTable, ARRAY_SIZE(FunctionTable));
}

24
src/core/hle/svc.cpp
View File

@ -364,18 +364,32 @@ static Result SetThreadPriority(Handle handle, s32 priority) {
}
/// Create a mutex
static Result CreateMutex(Handle* mutex, u32 initial_locked) {
*mutex = Kernel::CreateMutex((initial_locked != 0));
static Result CreateMutex(Handle* handle, u32 initial_locked) {
using Kernel::Mutex;
auto mutex_res = Mutex::Create(initial_locked != 0);
if (mutex_res.Failed())
return mutex_res.Code().raw;
SharedPtr<Mutex> mutex = mutex_res.MoveFrom();
*handle = Kernel::g_handle_table.Create(mutex).MoveFrom();
LOG_TRACE(Kernel_SVC, "called initial_locked=%s : created handle=0x%08X",
initial_locked ? "true" : "false", *mutex);
initial_locked ? "true" : "false", *handle);
return 0;
}
/// Release a mutex
static Result ReleaseMutex(Handle handle) {
using Kernel::Mutex;
LOG_TRACE(Kernel_SVC, "called handle=0x%08X", handle);
ResultCode res = Kernel::ReleaseMutex(handle);
return res.raw;
SharedPtr<Mutex> mutex = Kernel::g_handle_table.Get<Mutex>(handle);
if (mutex == nullptr)
return InvalidHandle(ErrorModule::Kernel).raw;
mutex->Release();
return RESULT_SUCCESS.raw;
}
/// Get the ID for the specified thread.