DiskCache: make Writer thread low-priority

FEXCore/Source/Interface/Core/DiskCache.cpp

@@ -316,7 +316,7 @@ namespace DiskCache {
     }
 
     if (IsWritingDiskCache()) {
-      Writer = fextl::make_unique<WorkQueueThread>();
+      Writer = fextl::make_unique<WorkQueueThread>(true);
     }
   }
 

FEXCore/Source/Utils/Threads.cpp

@@ -7,7 +7,7 @@
 #include <unistd.h>
 
 namespace FEXCore::Threads {
-static fextl::unique_ptr<FEXCore::Threads::Thread> CreateThread_Default(ThreadFunc Func, void* Arg) {
+static fextl::unique_ptr<FEXCore::Threads::Thread> CreateThread_Default(ThreadFunc Func, void* Arg, bool LowPriority) {
   ERROR_AND_DIE_FMT("Frontend didn't setup thread creation!");
 }
 
@@ -20,8 +20,8 @@ static FEXCore::Threads::Pointers Ptrs = {
   .CleanupAfterFork = CleanupAfterFork_Default,
 };
 
-fextl::unique_ptr<FEXCore::Threads::Thread> FEXCore::Threads::Thread::Create(ThreadFunc Func, void* Arg) {
-  return Ptrs.CreateThread(Func, Arg);
+fextl::unique_ptr<FEXCore::Threads::Thread> FEXCore::Threads::Thread::Create(ThreadFunc Func, void* Arg, bool LowPriority) {
+  return Ptrs.CreateThread(Func, Arg, LowPriority);
 }
 
 void FEXCore::Threads::Thread::CleanupAfterFork() {

FEXCore/Source/Utils/WorkQueueThread.cpp

@@ -4,8 +4,8 @@
 
 namespace FEXCore {
 
-WorkQueueThread::WorkQueueThread() {
-  Thread = FEXCore::Threads::Thread::Create(ThreadEntry, this);
+WorkQueueThread::WorkQueueThread(bool LowPriority) {
+  Thread = FEXCore::Threads::Thread::Create(ThreadEntry, this, LowPriority);
 }
 
 WorkQueueThread::~WorkQueueThread() {

FEXCore/include/FEXCore/Utils/Threads.h

@@ -7,7 +7,7 @@ namespace FEXCore::Threads {
 using ThreadFunc = void* (*)(void* user_ptr);
 
 class Thread;
-using CreateThreadFunc = fextl::unique_ptr<Thread> (*)(ThreadFunc Func, void* Arg);
+using CreateThreadFunc = fextl::unique_ptr<Thread> (*)(ThreadFunc Func, void* Arg, bool LowPriority);
 using CleanupAfterForkFunc = void (*)();
 
 struct Pointers {
@@ -28,7 +28,7 @@ public:
    * @name Calls provided API functions
    * @{ */
 
-  static fextl::unique_ptr<Thread> Create(ThreadFunc Func, void* Arg);
+  static fextl::unique_ptr<Thread> Create(ThreadFunc Func, void* Arg, bool LowPriority = false);
 
   static void CleanupAfterFork();
 

FEXCore/include/FEXCore/Utils/WorkQueueThread.h

@@ -18,7 +18,7 @@ public:
     virtual void Run() = 0;
   };
 
-  WorkQueueThread();
+  WorkQueueThread(bool LowPriority = false);
   ~WorkQueueThread();
 
   void QueueWork(fextl::unique_ptr<WorkItem> Work);