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yuzu/src/core/hle/kernel/thread.cpp

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// Copyright 2014 Citra Emulator Project / PPSSPP Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#include <stdio.h>
#include <list>
#include <algorithm>
#include <vector>
#include <map>
#include <string>
#include "common/common.h"
#include "common/thread_queue_list.h"
#include "core/core.h"
#include "core/mem_map.h"
#include "core/hle/hle.h"
#include "core/hle/svc.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/thread.h"
namespace Kernel {
class Thread : public Kernel::Object {
public:
const char* GetName() const { return name; }
const char* GetTypeName() const { return "Thread"; }
static Kernel::HandleType GetStaticHandleType() { return Kernel::HandleType::Thread; }
Kernel::HandleType GetHandleType() const { return Kernel::HandleType::Thread; }
inline bool IsRunning() const { return (status & THREADSTATUS_RUNNING) != 0; }
inline bool IsStopped() const { return (status & THREADSTATUS_DORMANT) != 0; }
inline bool IsReady() const { return (status & THREADSTATUS_READY) != 0; }
inline bool IsWaiting() const { return (status & THREADSTATUS_WAIT) != 0; }
inline bool IsSuspended() const { return (status & THREADSTATUS_SUSPEND) != 0; }
/**
* Wait for kernel object to synchronize
* @param wait Boolean wait set if current thread should wait as a result of sync operation
* @return Result of operation, 0 on success, otherwise error code
*/
Result WaitSynchronization(bool* wait) {
if (status != THREADSTATUS_DORMANT) {
Handle thread = GetCurrentThreadHandle();
if (std::find(waiting_threads.begin(), waiting_threads.end(), thread) == waiting_threads.end()) {
waiting_threads.push_back(thread);
}
WaitCurrentThread(WAITTYPE_THREADEND, this->GetHandle());
*wait = true;
}
return 0;
}
ThreadContext context;
u32 status;
u32 entry_point;
u32 stack_top;
u32 stack_size;
s32 initial_priority;
s32 current_priority;
s32 processor_id;
WaitType wait_type;
Handle wait_handle;
std::vector<Handle> waiting_threads;
char name[Kernel::MAX_NAME_LENGTH + 1];
};
// Lists all thread ids that aren't deleted/etc.
std::vector<Handle> g_thread_queue;
// Lists only ready thread ids.
Common::ThreadQueueList<Handle> g_thread_ready_queue;
Handle g_current_thread_handle;
Thread* g_current_thread;
/// Gets the current thread
inline Thread* GetCurrentThread() {
return g_current_thread;
}
/// Gets the current thread handle
Handle GetCurrentThreadHandle() {
return GetCurrentThread()->GetHandle();
}
/// Sets the current thread
inline void SetCurrentThread(Thread* t) {
g_current_thread = t;
g_current_thread_handle = t->GetHandle();
}
/// Saves the current CPU context
void SaveContext(ThreadContext& ctx) {
Core::g_app_core->SaveContext(ctx);
}
/// Loads a CPU context
void LoadContext(ThreadContext& ctx) {
Core::g_app_core->LoadContext(ctx);
}
/// Resets a thread
void ResetThread(Thread* t, u32 arg, s32 lowest_priority) {
memset(&t->context, 0, sizeof(ThreadContext));
t->context.cpu_registers[0] = arg;
t->context.pc = t->context.reg_15 = t->entry_point;
t->context.sp = t->stack_top;
t->context.cpsr = 0x1F; // Usermode
if (t->current_priority < lowest_priority) {
t->current_priority = t->initial_priority;
}
t->wait_type = WAITTYPE_NONE;
t->wait_handle = 0;
}
/// Change a thread to "ready" state
void ChangeReadyState(Thread* t, bool ready) {
Handle handle = t->GetHandle();
if (t->IsReady()) {
if (!ready) {
g_thread_ready_queue.remove(t->current_priority, handle);
}
} else if (ready) {
if (t->IsRunning()) {
g_thread_ready_queue.push_front(t->current_priority, handle);
} else {
g_thread_ready_queue.push_back(t->current_priority, handle);
}
t->status = THREADSTATUS_READY;
}
}
/// Verify that a thread has not been released from waiting
inline bool VerifyWait(const Handle& thread, WaitType type, Handle handle) {
Handle wait_id = 0;
Thread *t = g_object_pool.GetFast<Thread>(thread);
if (t) {
if (type == t->wait_type && handle == t->wait_handle) {
return true;
}
} else {
ERROR_LOG(KERNEL, "thread 0x%08X does not exist", thread);
}
return false;
}
/// Stops the current thread
void StopThread(Handle thread, const char* reason) {
u32 error;
Thread *t = g_object_pool.Get<Thread>(thread, error);
if (t) {
ChangeReadyState(t, false);
t->status = THREADSTATUS_DORMANT;
for (size_t i = 0; i < t->waiting_threads.size(); ++i) {
const Handle waiting_thread = t->waiting_threads[i];
if (VerifyWait(waiting_thread, WAITTYPE_THREADEND, thread)) {
ResumeThreadFromWait(waiting_thread);
}
}
t->waiting_threads.clear();
// Stopped threads are never waiting.
t->wait_type = WAITTYPE_NONE;
t->wait_handle = 0;
} else {
ERROR_LOG(KERNEL, "thread 0x%08X does not exist", thread);
}
}
/// Changes a threads state
void ChangeThreadState(Thread* t, ThreadStatus new_status) {
if (!t || t->status == new_status) {
return;
}
ChangeReadyState(t, (new_status & THREADSTATUS_READY) != 0);
t->status = new_status;
if (new_status == THREADSTATUS_WAIT) {
if (t->wait_type == WAITTYPE_NONE) {
ERROR_LOG(KERNEL, "Waittype none not allowed");
}
}
}
/// Calls a thread by marking it as "ready" (note: will not actually execute until current thread yields)
void CallThread(Thread* t) {
// Stop waiting
if (t->wait_type != WAITTYPE_NONE) {
t->wait_type = WAITTYPE_NONE;
}
ChangeThreadState(t, THREADSTATUS_READY);
}
/// Switches CPU context to that of the specified thread
void SwitchContext(Thread* t) {
Thread* cur = GetCurrentThread();
// Save context for current thread
if (cur) {
SaveContext(cur->context);
if (cur->IsRunning()) {
ChangeReadyState(cur, true);
}
}
// Load context of new thread
if (t) {
SetCurrentThread(t);
ChangeReadyState(t, false);
t->status = (t->status | THREADSTATUS_RUNNING) & ~THREADSTATUS_READY;
t->wait_type = WAITTYPE_NONE;
LoadContext(t->context);
} else {
SetCurrentThread(NULL);
}
}
/// Gets the next thread that is ready to be run by priority
Thread* NextThread() {
Handle next;
Thread* cur = GetCurrentThread();
if (cur && cur->IsRunning()) {
next = g_thread_ready_queue.pop_first_better(cur->current_priority);
} else {
next = g_thread_ready_queue.pop_first();
}
if (next == 0) {
return NULL;
}
return Kernel::g_object_pool.GetFast<Thread>(next);
}
/// Puts the current thread in the wait state for the given type
void WaitCurrentThread(WaitType wait_type, Handle wait_handle) {
Thread* t = GetCurrentThread();
t->wait_type = wait_type;
t->wait_handle = wait_handle;
ChangeThreadState(t, ThreadStatus(THREADSTATUS_WAIT | (t->status & THREADSTATUS_SUSPEND)));
}
/// Resumes a thread from waiting by marking it as "ready"
void ResumeThreadFromWait(Handle handle) {
u32 error;
Thread* t = Kernel::g_object_pool.Get<Thread>(handle, error);
if (t) {
t->status &= ~THREADSTATUS_WAIT;
if (!(t->status & (THREADSTATUS_WAITSUSPEND | THREADSTATUS_DORMANT | THREADSTATUS_DEAD))) {
ChangeReadyState(t, true);
}
}
}
/// Prints the thread queue for debugging purposes
void DebugThreadQueue() {
Thread* thread = GetCurrentThread();
if (!thread) {
return;
}
INFO_LOG(KERNEL, "0x%02X 0x%08X (current)", thread->current_priority, GetCurrentThreadHandle());
for (u32 i = 0; i < g_thread_queue.size(); i++) {
Handle handle = g_thread_queue[i];
s32 priority = g_thread_ready_queue.contains(handle);
if (priority != -1) {
INFO_LOG(KERNEL, "0x%02X 0x%08X", priority, handle);
}
}
}
/// Creates a new thread
Thread* CreateThread(Handle& handle, const char* name, u32 entry_point, s32 priority,
s32 processor_id, u32 stack_top, int stack_size) {
_assert_msg_(KERNEL, (priority >= THREADPRIO_HIGHEST && priority <= THREADPRIO_LOWEST),
"CreateThread priority=%d, outside of allowable range!", priority)
Thread* t = new Thread;
handle = Kernel::g_object_pool.Create(t);
g_thread_queue.push_back(handle);
g_thread_ready_queue.prepare(priority);
t->status = THREADSTATUS_DORMANT;
t->entry_point = entry_point;
t->stack_top = stack_top;
t->stack_size = stack_size;
t->initial_priority = t->current_priority = priority;
t->processor_id = processor_id;
t->wait_type = WAITTYPE_NONE;
t->wait_handle = 0;
strncpy(t->name, name, Kernel::MAX_NAME_LENGTH);
t->name[Kernel::MAX_NAME_LENGTH] = '\0';
return t;
}
/// Creates a new thread - wrapper for external user
Handle CreateThread(const char* name, u32 entry_point, s32 priority, u32 arg, s32 processor_id,
u32 stack_top, int stack_size) {
if (name == NULL) {
ERROR_LOG(KERNEL, "CreateThread(): NULL name");
return -1;
}
if ((u32)stack_size < 0x200) {
ERROR_LOG(KERNEL, "CreateThread(name=%s): invalid stack_size=0x%08X", name,
stack_size);
return -1;
}
if (priority < THREADPRIO_HIGHEST || priority > THREADPRIO_LOWEST) {
s32 new_priority = CLAMP(priority, THREADPRIO_HIGHEST, THREADPRIO_LOWEST);
WARN_LOG(KERNEL, "CreateThread(name=%s): invalid priority=0x%08X, clamping to %08X",
name, priority, new_priority);
// TODO(bunnei): Clamping to a valid priority is not necessarily correct behavior... Confirm
// validity of this
priority = new_priority;
}
if (!Memory::GetPointer(entry_point)) {
ERROR_LOG(KERNEL, "CreateThread(name=%s): invalid entry %08x", name, entry_point);
return -1;
}
Handle handle;
Thread* t = CreateThread(handle, name, entry_point, priority, processor_id, stack_top,
stack_size);
ResetThread(t, arg, 0);
HLE::EatCycles(32000);
CallThread(t);
// This won't schedule to the new thread, but it may to one woken from eating cycles.
// Technically, this should not eat all at once, and reschedule in the middle, but that's hard.
//HLE::Reschedule(__func__);
return handle;
}
/// Get the priority of the thread specified by handle
u32 GetThreadPriority(const Handle handle) {
Thread* thread = g_object_pool.GetFast<Thread>(handle);
_assert_msg_(KERNEL, thread, "called, but thread is NULL!");
return thread->current_priority;
}
/// Set the priority of the thread specified by handle
Result SetThreadPriority(Handle handle, s32 priority) {
Thread* thread = NULL;
if (!handle) {
thread = GetCurrentThread(); // TODO(bunnei): Is this correct behavior?
} else {
thread = g_object_pool.GetFast<Thread>(handle);
}
_assert_msg_(KERNEL, thread, "called, but thread is NULL!");
// If priority is invalid, clamp to valid range
if (priority < THREADPRIO_HIGHEST || priority > THREADPRIO_LOWEST) {
s32 new_priority = CLAMP(priority, THREADPRIO_HIGHEST, THREADPRIO_LOWEST);
WARN_LOG(KERNEL, "invalid priority=0x%08X, clamping to %08X", priority, new_priority);
// TODO(bunnei): Clamping to a valid priority is not necessarily correct behavior... Confirm
// validity of this
priority = new_priority;
}
// Change thread priority
s32 old = thread->current_priority;
g_thread_ready_queue.remove(old, handle);
thread->current_priority = priority;
g_thread_ready_queue.prepare(thread->current_priority);
// Change thread status to "ready" and push to ready queue
if (thread->IsRunning()) {
thread->status = (thread->status & ~THREADSTATUS_RUNNING) | THREADSTATUS_READY;
}
if (thread->IsReady()) {
g_thread_ready_queue.push_back(thread->current_priority, handle);
}
HLE::EatCycles(450);
return 0;
}
/// Sets up the primary application thread
Handle SetupMainThread(s32 priority, int stack_size) {
Handle handle;
// Initialize new "main" thread
Thread* t = CreateThread(handle, "main", Core::g_app_core->GetPC(), priority,
THREADPROCESSORID_0, Memory::SCRATCHPAD_VADDR_END, stack_size);
ResetThread(t, 0, 0);
// If running another thread already, set it to "ready" state
Thread* cur = GetCurrentThread();
if (cur && cur->IsRunning()) {
ChangeReadyState(cur, true);
}
// Run new "main" thread
SetCurrentThread(t);
t->status = THREADSTATUS_RUNNING;
LoadContext(t->context);
return handle;
}
/// Reschedules to the next available thread (call after current thread is suspended)
void Reschedule() {
Thread* prev = GetCurrentThread();
Thread* next = NextThread();
HLE::g_reschedule = false;
if (next > 0) {
INFO_LOG(KERNEL, "context switch 0x%08X -> 0x%08X", prev->GetHandle(), next->GetHandle());
SwitchContext(next);
// Hack - There is no mechanism yet to waken the primary thread if it has been put to sleep
// by a simulated VBLANK thread switch. So, we'll just immediately set it to "ready" again.
// This results in the current thread yielding on a VBLANK once, and then it will be
// immediately placed back in the queue for execution.
if (prev->wait_type == WAITTYPE_VBLANK) {
ResumeThreadFromWait(prev->GetHandle());
}
}
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void ThreadingInit() {
}
void ThreadingShutdown() {
}
} // namespace
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