svc: Implement svcLockMutex.

This commit is contained in:
bunnei 2018-01-01 14:02:26 -05:00
parent d0046b120a
commit b9950cd4b0
3 changed files with 134 additions and 24 deletions

View file

@ -7,8 +7,10 @@
#include <boost/range/algorithm_ext/erase.hpp>
#include "common/assert.h"
#include "core/core.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_address_table.h"
#include "core/hle/kernel/thread.h"
namespace Kernel {
@ -25,17 +27,25 @@ void ReleaseThreadMutexes(Thread* thread) {
Mutex::Mutex() {}
Mutex::~Mutex() {}
SharedPtr<Mutex> Mutex::Create(bool initial_locked, VAddr addr, std::string name) {
SharedPtr<Mutex> Mutex::Create(SharedPtr<Kernel::Thread> holding_thread, VAddr guest_addr,
std::string name) {
SharedPtr<Mutex> mutex(new Mutex);
mutex->lock_count = 0;
mutex->addr = addr;
mutex->guest_addr = guest_addr;
mutex->name = std::move(name);
mutex->holding_thread = nullptr;
// Acquire mutex with current thread if initialized as locked
if (initial_locked)
mutex->Acquire(GetCurrentThread());
// If mutex was initialized with a holding thread, acquire it by the holding thread
if (holding_thread) {
mutex->Acquire(holding_thread.get());
}
// Mutexes are referenced by guest address, so track this in the kernel
g_object_address_table.Insert(guest_addr, mutex);
// Verify that the created mutex matches the guest state for the mutex
mutex->VerifyGuestState();
return mutex;
}
@ -53,15 +63,33 @@ void Mutex::Acquire(Thread* thread) {
thread->held_mutexes.insert(this);
holding_thread = thread;
thread->UpdatePriority();
UpdateGuestState();
Core::System::GetInstance().PrepareReschedule();
}
lock_count++;
}
void Mutex::Release() {
// Only release if the mutex is held
if (lock_count > 0) {
ResultCode Mutex::Release(Thread* thread) {
// We can only release the mutex if it's held by the calling thread.
if (thread != holding_thread) {
if (holding_thread) {
LOG_ERROR(
Kernel,
"Tried to release a mutex (owned by thread id %u) from a different thread id %u",
holding_thread->thread_id, thread->thread_id);
}
// TODO(bunnei): Use correct error code
return ResultCode(-1);
}
// Note: It should not be possible for the situation where the mutex has a holding thread with a
// zero lock count to occur. The real kernel still checks for this, so we do too.
if (lock_count <= 0) {
// TODO(bunnei): Use correct error code
return ResultCode(-1);
}
lock_count--;
// Yield to the next thread only if we've fully released the mutex
@ -70,21 +98,25 @@ void Mutex::Release() {
holding_thread->UpdatePriority();
holding_thread = nullptr;
WakeupAllWaitingThreads();
UpdateGuestState();
Core::System::GetInstance().PrepareReschedule();
}
}
return RESULT_SUCCESS;
}
void Mutex::AddWaitingThread(SharedPtr<Thread> thread) {
WaitObject::AddWaitingThread(thread);
thread->pending_mutexes.insert(this);
UpdatePriority();
UpdateGuestState();
}
void Mutex::RemoveWaitingThread(Thread* thread) {
WaitObject::RemoveWaitingThread(thread);
thread->pending_mutexes.erase(this);
UpdatePriority();
UpdateGuestState();
}
void Mutex::UpdatePriority() {
@ -103,4 +135,17 @@ void Mutex::UpdatePriority() {
}
}
} // namespace
void Mutex::UpdateGuestState() {
GuestState guest_state{Memory::Read32(guest_addr)};
guest_state.has_waiters.Assign(!GetWaitingThreads().empty());
guest_state.holding_thread_handle.Assign(holding_thread ? holding_thread->guest_handle : 0);
Memory::Write32(guest_addr, guest_state.raw);
}
void Mutex::VerifyGuestState() {
GuestState guest_state{Memory::Read32(guest_addr)};
ASSERT(guest_state.has_waiters == !GetWaitingThreads().empty());
ASSERT(guest_state.holding_thread_handle == holding_thread->guest_handle);
}
} // namespace Kernel

View file

@ -6,8 +6,10 @@
#include <string>
#include "common/common_types.h"
#include "common/swap.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/wait_object.h"
#include "core/hle/result.h"
namespace Kernel {
@ -17,11 +19,15 @@ class Mutex final : public WaitObject {
public:
/**
* Creates a mutex.
* @param initial_locked Specifies if the mutex should be locked initially
* @param holding_thread Specifies a thread already holding the mutex. If not nullptr, this
* thread will acquire the mutex.
* @param guest_addr Address of the object tracking the mutex in guest memory. If specified,
* this mutex will update the guest object when its state changes.
* @param name Optional name of mutex
* @return Pointer to new Mutex object
*/
static SharedPtr<Mutex> Create(bool initial_locked, VAddr addr, std::string name = "Unknown");
static SharedPtr<Mutex> Create(SharedPtr<Kernel::Thread> holding_thread, VAddr guest_addr = 0,
std::string name = "Unknown");
std::string GetTypeName() const override {
return "Mutex";
@ -39,7 +45,7 @@ public:
u32 priority; ///< The priority of the mutex, used for priority inheritance.
std::string name; ///< Name of mutex (optional)
SharedPtr<Thread> holding_thread; ///< Thread that has acquired the mutex
VAddr addr;
VAddr guest_addr; ///< Address of the guest mutex value
/**
* Elevate the mutex priority to the best priority
@ -53,11 +59,32 @@ public:
void AddWaitingThread(SharedPtr<Thread> thread) override;
void RemoveWaitingThread(Thread* thread) override;
void Release();
/**
* Attempts to release the mutex from the specified thread.
* @param thread Thread that wants to release the mutex.
* @returns The result code of the operation.
*/
ResultCode Release(Thread* thread);
private:
Mutex();
~Mutex() override;
/// Object in guest memory used to track the mutex state
union GuestState {
u32_le raw;
/// Handle of the thread that currently holds the mutex, 0 if available
BitField<0, 30, u32_le> holding_thread_handle;
/// 1 when there are threads waiting for this mutex, otherwise 0
BitField<30, 1, u32_le> has_waiters;
};
static_assert(sizeof(GuestState) == 4, "GuestState size is incorrect");
/// Updates the state of the object tracking this mutex in guest memory
void UpdateGuestState();
/// Verifies the state of the object tracking this mutex in guest memory
void VerifyGuestState();
};
/**
@ -66,4 +93,4 @@ private:
*/
void ReleaseThreadMutexes(Thread* thread);
} // namespace
} // namespace Kernel

View file

@ -122,6 +122,44 @@ static ResultCode GetProcessId(u32* process_id, Kernel::Handle process_handle) {
return RESULT_SUCCESS;
}
/// Attempts to locks a mutex, creating it if it does not already exist
static ResultCode LockMutex(Handle holding_thread_handle, VAddr mutex_addr,
Handle requesting_thread_handle) {
LOG_TRACE(Kernel_SVC,
"called holding_thread_handle=0x%08X, mutex_addr=0x%llx, "
"requesting_current_thread_handle=0x%08X",
holding_thread_handle, mutex_addr, requesting_thread_handle);
SharedPtr<Kernel::Thread> holding_thread =
Kernel::g_handle_table.Get<Kernel::Thread>(holding_thread_handle);
SharedPtr<Kernel::Thread> requesting_thread =
Kernel::g_handle_table.Get<Kernel::Thread>(requesting_thread_handle);
ASSERT(holding_thread);
ASSERT(requesting_thread);
SharedPtr<Kernel::Mutex> mutex = Kernel::g_object_address_table.Get<Kernel::Mutex>(mutex_addr);
if (!mutex) {
// Create a new mutex for the specified address if one does not already exist
mutex = Kernel::Mutex::Create(holding_thread, mutex_addr);
mutex->name = Common::StringFromFormat("mutex-%llx", mutex_addr);
}
if (mutex->ShouldWait(requesting_thread.get())) {
// If we cannot lock the mutex, then put the thread too sleep and trigger a reschedule
requesting_thread->wait_objects = {mutex};
mutex->AddWaitingThread(requesting_thread);
requesting_thread->status = THREADSTATUS_WAIT_SYNCH_ANY;
Core::System::GetInstance().PrepareReschedule();
} else {
// The mutex is available, lock it
mutex->Acquire(requesting_thread.get());
}
return RESULT_SUCCESS;
}
/// Break program execution
static void Break(u64 unk_0, u64 unk_1, u64 unk_2) {
LOG_CRITICAL(Debug_Emulated, "Emulated program broke execution!");
@ -371,8 +409,8 @@ static const FunctionDef SVC_Table[] = {
{0x17, nullptr, "svcResetSignal"},
{0x18, nullptr, "svcWaitSynchronization"},
{0x19, nullptr, "svcCancelSynchronization"},
{0x1A, nullptr, "svcLockMutex"},
{0x1B, nullptr, "svcUnlockMutex"},
{0x1A, HLE::Wrap<LockMutex>, "svcLockMutex"},
{0x1C, nullptr, "svcWaitProcessWideKeyAtomic"},
{0x1D, HLE::Wrap<SignalProcessWideKey>, "svcSignalProcessWideKey"},
{0x1E, nullptr, "svcGetSystemTick"},