Linux: fix thread priority

Utilities/Thread.cpp

@@ -3029,19 +3029,26 @@ void thread_ctrl::set_native_priority(int priority)
 		sig_log.error("SetThreadPriority() failed: %s", fmt::win_error{GetLastError(), nullptr});
 	}
 #else
-	int policy;
-	struct sched_param param;
-
-	pthread_getschedparam(pthread_self(), &policy, &param);
-
+	// available niceness for nonroot: 0~19
+	int linuxprio = 0;
+	id_t threadpid = gettid();
+	
 	if (priority > 0)
-		param.sched_priority = sched_get_priority_max(policy);
-	if (priority < 0)
-		param.sched_priority = sched_get_priority_min(policy);
+		linuxprio = 0;
+	else if (priority < 0)
+		linuxprio = 19;
 
-	if (int err = pthread_setschedparam(pthread_self(), policy, &param))
+	// nonroot cannot increase niceness value
+	if (getpriority(PRIO_PROCESS, threadpid) < linuxprio)
 	{
-		sig_log.error("pthread_setschedparam() failed: %d", err);
+		if (int err = setpriority(PRIO_PROCESS, threadpid, linuxprio))
+		{
+			sig_log.error("setpriority(%d, %d) failed: %d", threadpid, linuxprio, err);
+		}
+		else
+		{
+			sig_log.success("setpriority(%d, %d) successful.", threadpid, linuxprio);
+		}
 	}
 #endif
 }

rpcs3/Emu/Cell/PPUThread.cpp

@@ -3413,8 +3413,10 @@ extern void ppu_precompile(std::vector<std::string>& dir_queue, std::vector<ppu_
 #ifdef __APPLE__
 		pthread_jit_write_protect_np(false);
 #endif
+#ifdef _WIN32
 		// Set low priority
 		thread_ctrl::scoped_priority low_prio(-1);
+#endif
 
 		for (usz func_i = fnext++; func_i < file_queue.size(); func_i = fnext++, g_progr_fdone++)
 		{
@@ -3528,8 +3530,10 @@ extern void ppu_precompile(std::vector<std::string>& dir_queue, std::vector<ppu_
 #ifdef __APPLE__
 		pthread_jit_write_protect_np(false);
 #endif
+#ifdef _WIN32
 		// Set low priority
 		thread_ctrl::scoped_priority low_prio(-1);
+#endif
 
 		auto slice = possible_exec_file_paths.pop_all();
 
@@ -4239,8 +4243,10 @@ bool ppu_initialize(const ppu_module& info, bool check_only)
 
 		named_thread_group threads(fmt::format("PPUW.%u.", ++g_fxo->get<thread_index_allocator>().index), thread_count, [&]()
 		{
-			// Set low priority
-			thread_ctrl::scoped_priority low_prio(-1);
+#ifdef _WIN32
+		// Set low priority
+		thread_ctrl::scoped_priority low_prio(-1);
+#endif
 
 #ifdef __APPLE__
 			pthread_jit_write_protect_np(false);

rpcs3/Emu/Cell/SPURecompiler.cpp

@@ -660,8 +660,10 @@ void spu_cache::initialize()
 #ifdef __APPLE__
 		pthread_jit_write_protect_np(false);
 #endif
+#ifdef _WIN32
 		// Set low priority
 		thread_ctrl::scoped_priority low_prio(-1);
+#endif
 
 		// Initialize compiler instances for parallel compilation
 		std::unique_ptr<spu_recompiler_base> compiler;

rpcs3/Emu/RSX/GL/GLPipelineCompiler.cpp

@@ -38,6 +38,10 @@ namespace gl
 
 	void pipe_compiler::operator()()
 	{
+#ifndef _WIN32
+		// Set low priority
+		thread_ctrl::scoped_priority low_prio(-1);
+#endif
 		while (thread_ctrl::state() != thread_state::aborting)
 		{
 			for (auto&& job : m_work_queue.pop_all())

rpcs3/Emu/RSX/VK/VKPipelineCompiler.cpp

@@ -32,6 +32,10 @@ namespace vk
 
 	void pipe_compiler::operator()()
 	{
+#ifndef _WIN32
+		// Set low priority
+		thread_ctrl::scoped_priority low_prio(-1);
+#endif
 		while (thread_ctrl::state() != thread_state::aborting)
 		{
 			for (auto&& job : m_work_queue.pop_all())