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-rw-r--r--src/core/hle/kernel/errors.h1
-rw-r--r--src/core/hle/kernel/mutex.cpp94
-rw-r--r--src/core/hle/kernel/mutex.h12
-rw-r--r--src/core/hle/kernel/svc.cpp22
-rw-r--r--src/core/hle/kernel/thread.cpp13
-rw-r--r--src/core/hle/kernel/thread.h6
6 files changed, 126 insertions, 22 deletions
diff --git a/src/core/hle/kernel/errors.h b/src/core/hle/kernel/errors.h
index 29d8dfdaa..5be20c878 100644
--- a/src/core/hle/kernel/errors.h
+++ b/src/core/hle/kernel/errors.h
@@ -20,6 +20,7 @@ enum {
MaxConnectionsReached = 52,
// Confirmed Switch OS error codes
+ MisalignedAddress = 102,
InvalidHandle = 114,
Timeout = 117,
SynchronizationCanceled = 118,
diff --git a/src/core/hle/kernel/mutex.cpp b/src/core/hle/kernel/mutex.cpp
index 0b9dc700c..50a9a0805 100644
--- a/src/core/hle/kernel/mutex.cpp
+++ b/src/core/hle/kernel/mutex.cpp
@@ -7,6 +7,7 @@
#include <boost/range/algorithm_ext/erase.hpp>
#include "common/assert.h"
#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"
@@ -15,6 +16,30 @@
namespace Kernel {
+/// Returns the number of threads that are waiting for a mutex, and the highest priority one among
+/// those.
+static std::pair<SharedPtr<Thread>, u32> GetHighestPriorityMutexWaitingThread(VAddr mutex_addr) {
+ auto& thread_list = Core::System::GetInstance().Scheduler().GetThreadList();
+
+ SharedPtr<Thread> highest_priority_thread;
+ u32 num_waiters = 0;
+
+ for (auto& thread : thread_list) {
+ if (thread->mutex_wait_address != mutex_addr)
+ continue;
+
+ ASSERT(thread->status == THREADSTATUS_WAIT_MUTEX);
+
+ ++num_waiters;
+ if (highest_priority_thread == nullptr ||
+ thread->GetPriority() < highest_priority_thread->GetPriority()) {
+ highest_priority_thread = thread;
+ }
+ }
+
+ return {highest_priority_thread, num_waiters};
+}
+
void ReleaseThreadMutexes(Thread* thread) {
for (auto& mtx : thread->held_mutexes) {
mtx->SetHasWaiters(false);
@@ -135,4 +160,73 @@ void Mutex::SetHasWaiters(bool has_waiters) {
Memory::Write32(guest_addr, guest_state.raw);
}
+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 ResultCode(ErrorModule::Kernel, ErrCodes::MisalignedAddress);
+ }
+
+ SharedPtr<Thread> holding_thread = g_handle_table.Get<Thread>(holding_thread_handle);
+ SharedPtr<Thread> requesting_thread = g_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());
+
+ 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)
+ return ERR_INVALID_HANDLE;
+
+ // Wait until the mutex is released
+ requesting_thread->mutex_wait_address = address;
+ requesting_thread->wait_handle = requesting_thread_handle;
+
+ requesting_thread->status = THREADSTATUS_WAIT_MUTEX;
+ requesting_thread->wakeup_callback = nullptr;
+
+ Core::System::GetInstance().PrepareReschedule();
+
+ return RESULT_SUCCESS;
+}
+
+ResultCode Mutex::Release(VAddr address) {
+ // The mutex address must be 4-byte aligned
+ if ((address % sizeof(u32)) != 0) {
+ return ResultCode(ErrorModule::Kernel, ErrCodes::MisalignedAddress);
+ }
+
+ auto [thread, num_waiters] = GetHighestPriorityMutexWaitingThread(address);
+
+ // There are no more threads waiting for the mutex, release it completely.
+ if (thread == nullptr) {
+ Memory::Write32(address, 0);
+ return RESULT_SUCCESS;
+ }
+
+ u32 mutex_value = thread->wait_handle;
+
+ if (num_waiters >= 2) {
+ // Notify the guest that there are still some threads waiting for the mutex
+ mutex_value |= Mutex::MutexHasWaitersFlag;
+ }
+
+ // Grant the mutex to the next waiting thread and resume it.
+ Memory::Write32(address, mutex_value);
+
+ ASSERT(thread->status == THREADSTATUS_WAIT_MUTEX);
+ thread->ResumeFromWait();
+
+ thread->condvar_wait_address = 0;
+ thread->mutex_wait_address = 0;
+ thread->wait_handle = 0;
+
+ return RESULT_SUCCESS;
+}
} // namespace Kernel
diff --git a/src/core/hle/kernel/mutex.h b/src/core/hle/kernel/mutex.h
index 38db21005..310923087 100644
--- a/src/core/hle/kernel/mutex.h
+++ b/src/core/hle/kernel/mutex.h
@@ -77,6 +77,18 @@ public:
/// Sets the has_waiters bit in the guest state.
void SetHasWaiters(bool has_waiters);
+ /// 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(VAddr address, Handle holding_thread_handle,
+ Handle requesting_thread_handle);
+
+ /// Releases the mutex at the specified address.
+ static ResultCode Release(VAddr address);
+
private:
Mutex();
~Mutex() override;
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp
index 6204bcaaa..92273b488 100644
--- a/src/core/hle/kernel/svc.cpp
+++ b/src/core/hle/kernel/svc.cpp
@@ -262,32 +262,14 @@ static ResultCode ArbitrateLock(Handle holding_thread_handle, VAddr mutex_addr,
"requesting_current_thread_handle=0x%08X",
holding_thread_handle, mutex_addr, requesting_thread_handle);
- SharedPtr<Thread> holding_thread = g_handle_table.Get<Thread>(holding_thread_handle);
- SharedPtr<Thread> requesting_thread = g_handle_table.Get<Thread>(requesting_thread_handle);
-
- ASSERT(requesting_thread);
- ASSERT(requesting_thread == GetCurrentThread());
-
- SharedPtr<Mutex> mutex = g_object_address_table.Get<Mutex>(mutex_addr);
- if (!mutex) {
- // Create a new mutex for the specified address if one does not already exist
- mutex = Mutex::Create(holding_thread, mutex_addr);
- mutex->name = Common::StringFromFormat("mutex-%llx", mutex_addr);
- }
-
- ASSERT(holding_thread == mutex->GetHoldingThread());
-
- return WaitSynchronization1(mutex, requesting_thread.get());
+ return Mutex::TryAcquire(mutex_addr, holding_thread_handle, requesting_thread_handle);
}
/// Unlock a mutex
static ResultCode ArbitrateUnlock(VAddr mutex_addr) {
LOG_TRACE(Kernel_SVC, "called mutex_addr=0x%llx", mutex_addr);
- SharedPtr<Mutex> mutex = g_object_address_table.Get<Mutex>(mutex_addr);
- ASSERT(mutex);
-
- return mutex->Release(GetCurrentThread());
+ return Mutex::Release(mutex_addr);
}
/// Break program execution
diff --git a/src/core/hle/kernel/thread.cpp b/src/core/hle/kernel/thread.cpp
index f3a8aa4aa..0a0ad7cfb 100644
--- a/src/core/hle/kernel/thread.cpp
+++ b/src/core/hle/kernel/thread.cpp
@@ -126,6 +126,14 @@ static void ThreadWakeupCallback(u64 thread_handle, int cycles_late) {
resume = thread->wakeup_callback(ThreadWakeupReason::Timeout, thread, nullptr, 0);
}
+ if (thread->mutex_wait_address != 0 || thread->condvar_wait_address != 0 ||
+ thread->wait_handle) {
+ ASSERT(thread->status == THREADSTATUS_WAIT_MUTEX);
+ thread->mutex_wait_address = 0;
+ thread->condvar_wait_address = 0;
+ thread->wait_handle = 0;
+ }
+
if (resume)
thread->ResumeFromWait();
}
@@ -151,6 +159,7 @@ void Thread::ResumeFromWait() {
case THREADSTATUS_WAIT_HLE_EVENT:
case THREADSTATUS_WAIT_SLEEP:
case THREADSTATUS_WAIT_IPC:
+ case THREADSTATUS_WAIT_MUTEX:
break;
case THREADSTATUS_READY:
@@ -256,7 +265,9 @@ ResultVal<SharedPtr<Thread>> Thread::Create(std::string name, VAddr entry_point,
thread->last_running_ticks = CoreTiming::GetTicks();
thread->processor_id = processor_id;
thread->wait_objects.clear();
- thread->wait_address = 0;
+ thread->mutex_wait_address = 0;
+ thread->condvar_wait_address = 0;
+ thread->wait_handle = 0;
thread->name = std::move(name);
thread->callback_handle = wakeup_callback_handle_table.Create(thread).Unwrap();
thread->owner_process = owner_process;
diff --git a/src/core/hle/kernel/thread.h b/src/core/hle/kernel/thread.h
index dbf47e269..a3a6e6a64 100644
--- a/src/core/hle/kernel/thread.h
+++ b/src/core/hle/kernel/thread.h
@@ -43,6 +43,7 @@ enum ThreadStatus {
THREADSTATUS_WAIT_IPC, ///< Waiting for the reply from an IPC request
THREADSTATUS_WAIT_SYNCH_ANY, ///< Waiting due to WaitSynch1 or WaitSynchN with wait_all = false
THREADSTATUS_WAIT_SYNCH_ALL, ///< Waiting due to WaitSynchronizationN with wait_all = true
+ THREADSTATUS_WAIT_MUTEX, ///< Waiting due to an ArbitrateLock/WaitProcessWideKey svc
THREADSTATUS_DORMANT, ///< Created but not yet made ready
THREADSTATUS_DEAD ///< Run to completion, or forcefully terminated
};
@@ -217,7 +218,10 @@ public:
// passed to WaitSynchronization1/N.
std::vector<SharedPtr<WaitObject>> wait_objects;
- VAddr wait_address; ///< If waiting on an AddressArbiter, this is the arbitration address
+ // If waiting on a ConditionVariable, this is the ConditionVariable address
+ VAddr condvar_wait_address;
+ VAddr mutex_wait_address; ///< If waiting on a Mutex, this is the mutex address
+ Handle wait_handle; ///< The handle used to wait for the mutex.
std::string name;
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-27 20:42:49 +0000