Remove "permanent" and "temporary" threads tagging and add a way to name game threads (#45)

* System to specify thread types by the game

* Register threads callbacks

* Remove temporary and permanent threads

* Fix `pthread_setname_np` not liking names longer than 16 bytes

* Singular

* Rename events_callbacks arg

* Use `prctl` instead of `pthread_setname_np` for naming a thread

* Fix typo

librecomp/include/librecomp/game.hpp

@@ -56,7 +56,8 @@ namespace recomp {
         const ultramodern::input::callbacks_t& input_callbacks,
         const ultramodern::gfx_callbacks_t& gfx_callbacks,
         const ultramodern::events::callbacks_t& events_callbacks,
-        const ultramodern::error_handling::callbacks_t& error_handling_callbacks_
+        const ultramodern::error_handling::callbacks_t& error_handling_callbacks,
+        const ultramodern::threads::callbacks_t& threads_callbacks
     );
 
 	void start_game(const std::u8string& game_id);

librecomp/src/recomp.cpp

@@ -381,7 +381,8 @@ void recomp::start(
     const ultramodern::input::callbacks_t& input_callbacks,
     const ultramodern::gfx_callbacks_t& gfx_callbacks_,
     const ultramodern::events::callbacks_t& events_callbacks,
-    const ultramodern::error_handling::callbacks_t& error_handling_callbacks_
+    const ultramodern::error_handling::callbacks_t& error_handling_callbacks,
+    const ultramodern::threads::callbacks_t& threads_callbacks
 ) {
     recomp::check_all_stored_roms();
 
@@ -392,7 +393,7 @@ void recomp::start(
         .run_task = recomp::rsp::run_task,
     };
 
-    ultramodern::set_callbacks(ultramodern_rsp_callbacks, renderer_callbacks, audio_callbacks, input_callbacks, gfx_callbacks_, events_callbacks, error_handling_callbacks_);
+    ultramodern::set_callbacks(ultramodern_rsp_callbacks, renderer_callbacks, audio_callbacks, input_callbacks, gfx_callbacks_, events_callbacks, error_handling_callbacks, threads_callbacks);
 
     ultramodern::gfx_callbacks_t gfx_callbacks = gfx_callbacks_;
 

ultramodern/include/ultramodern/rsp.hpp

@@ -1,14 +1,10 @@
-#ifndef __RSP_STUFF_HPP__
-#define __RSP_STUFF_HPP__
-
-// TODO: rename
+#ifndef __RSP_HPP__
+#define __RSP_HPP__
 
 #include <cstdint>
 
 #include "ultra64.h"
 
-// TODO: Move these to ultramodern namespace?
-
 namespace ultramodern {
     namespace rsp {
         struct callbacks_t {

ultramodern/include/ultramodern/threads.hpp

@@ -0,0 +1,29 @@
+#ifndef __THREADS_HPP__
+#define __THREADS_HPP__
+
+#include <string>
+
+#include "ultra64.h"
+
+namespace ultramodern {
+    namespace threads {
+        struct callbacks_t {
+            using get_game_thread_name_t = std::string(const OSThread* t);
+
+            /**
+             * Allows to specifying a custom name for each thread. Mainly for debugging purposes.
+             *
+             * For maximum cross-platform compatibility the returned name should be at most 15 bytes long (16 bytes including the null terminator).
+             *
+             * If this function is not provided then the thread id will be used as the name of the thread.
+             */
+            get_game_thread_name_t *get_game_thread_name;
+        };
+
+        void set_callbacks(const callbacks_t& callbacks);
+
+        std::string get_game_thread_name(const OSThread* t);
+    }
+}
+
+#endif

ultramodern/include/ultramodern/ultramodern.hpp

@@ -9,13 +9,15 @@
 #undef MOODYCAMEL_DELETE_FUNCTION
 #define MOODYCAMEL_DELETE_FUNCTION = delete
 #include "lightweightsemaphore.h"
+
 #include "ultra64.h"
 
 #include "ultramodern/error_handling.hpp"
 #include "ultramodern/events.hpp"
 #include "ultramodern/input.hpp"
-#include "ultramodern/rsp.hpp"
 #include "ultramodern/renderer_context.hpp"
+#include "ultramodern/rsp.hpp"
+#include "ultramodern/threads.hpp"
 
 struct UltraThreadContext {
     std::thread host_thread;
@@ -58,8 +60,6 @@ void run_next_thread_and_wait(RDRAM_ARG1);
 void resume_thread_and_wait(RDRAM_ARG OSThread* t);
 void schedule_running_thread(RDRAM_ARG PTR(OSThread) t);
 void cleanup_thread(UltraThreadContext* thread_context);
-uint32_t permanent_thread_count();
-uint32_t temporary_thread_count();
 struct thread_terminated : std::exception {};
 
 enum class ThreadPriority {
@@ -144,7 +144,8 @@ void set_callbacks(
     const input::callbacks_t& input_callbacks,
     const gfx_callbacks_t& gfx_callbacks,
     const events::callbacks_t& events_callbacks,
-    const error_handling::callbacks_t& error_handling_callbacks
+    const error_handling::callbacks_t& error_handling_callbacks,
+    const threads::callbacks_t& threads_callbacks
 );
 } // namespace ultramodern
 

ultramodern/src/threads.cpp

@@ -7,11 +7,26 @@
 #include "ultramodern/ultramodern.hpp"
 #include "blockingconcurrentqueue.h"
 
+#include "ultramodern/threads.hpp"
+
 // Native APIs only used to set thread names for easier debugging
 #ifdef _WIN32
 #include <Windows.h>
 #endif
 
+static ultramodern::threads::callbacks_t threads_callbacks;
+
+void ultramodern::threads::set_callbacks(const callbacks_t& callbacks) {
+    threads_callbacks = callbacks;
+}
+
+std::string ultramodern::threads::get_game_thread_name(const OSThread* t) {
+    if (threads_callbacks.get_game_thread_name == nullptr) {
+        return "Game Thread " + std::to_string(t->id);
+    }
+    return threads_callbacks.get_game_thread_name(t);
+}
+
 extern "C" void bootproc();
 
 thread_local bool is_main_thread = false;
@@ -80,8 +95,15 @@ void ultramodern::set_native_thread_priority(ThreadPriority pri) {
     // SetThreadPriority(GetCurrentThread(), nPriority);
 }
 #elif defined(__linux__)
+#include <sys/prctl.h>
+
 void ultramodern::set_native_thread_name(const std::string& name) {
-    pthread_setname_np(pthread_self(), name.c_str());
+    if (name.length() > 15) {
+        // Linux only accepts up to 16 characters including the null terminator for a thread name.
+        debug_printf("[Thread] The thread name '%s' will be truncated to 15 characters", name.c_str());
+    }
+
+    prctl(PR_SET_NAME, name.c_str());
 }
 
 void ultramodern::set_native_thread_priority(ThreadPriority pri) {
@@ -113,15 +135,17 @@ void ultramodern::set_native_thread_priority(ThreadPriority pri) {
 }
 #elif defined(__APPLE__)
 void ultramodern::set_native_thread_name(const std::string& name) {
+    if (name.length() > 15) {
+        // Macs seem to only accept up to 16 characters including the null terminator for a thread name.
+        debug_printf("[Thread] The thread name '%s' will be truncated to 15 characters", name.c_str());
+    }
+
     pthread_setname_np(name.c_str());
 }
 
 void ultramodern::set_native_thread_priority(ThreadPriority pri) {}
 #endif
 
-std::atomic_int temporary_threads = 0;
-std::atomic_int permanent_threads = 0;
-
 void wait_for_resumed(RDRAM_ARG UltraThreadContext* thread_context) {
     TO_PTR(OSThread, ultramodern::this_thread())->context->running.wait();
     // If this thread's context was replaced by another thread or deleted, destroy it again from its own context.
@@ -165,17 +189,9 @@ static void _thread_func(RDRAM_ARG PTR(OSThread) self_, PTR(thread_func_t) entry
     is_game_thread = true;
 
     // Set the thread name
-    ultramodern::set_native_thread_name("Game Thread " + std::to_string(self->id));
+    ultramodern::set_native_thread_name(ultramodern::threads::get_game_thread_name(self));
     ultramodern::set_native_thread_priority(ultramodern::ThreadPriority::High);
 
-    // TODO fix these being hardcoded (this is only used for quicksaving)
-    if ((self->id == 2 && self->priority == 5) || self->id == 13) { // slowly, flashrom
-        temporary_threads.fetch_add(1);
-    }
-    else if (self->id != 1 && self->id != 2) { // ignore idle and fault
-        permanent_threads.fetch_add(1);
-    }
-
     // Signal the initialized semaphore to indicate that this thread can be started.
     thread_context->initialized.signal();
 
@@ -206,19 +222,6 @@ static void _thread_func(RDRAM_ARG PTR(OSThread) self_, PTR(thread_func_t) entry
 
     // Dispose of this thread now that it's completed or terminated.
     ultramodern::cleanup_thread(thread_context);
-    
-    // TODO fix these being hardcoded (this is only used for quicksaving)
-    if ((self->id == 2 && self->priority == 5) || self->id == 13) { // slowly, flashrom
-        temporary_threads.fetch_sub(1);
-    }
-}
-
-uint32_t ultramodern::permanent_thread_count() {
-    return permanent_threads.load();
-}
-
-uint32_t ultramodern::temporary_thread_count() {
-    return temporary_threads.load();
 }
 
 extern "C" void osStartThread(RDRAM_ARG PTR(OSThread) t_) {

ultramodern/src/ultrainit.cpp

@@ -7,16 +7,18 @@ void ultramodern::set_callbacks(
     const audio_callbacks_t& audio_callbacks,
     const input::callbacks_t& input_callbacks,
     const gfx_callbacks_t& gfx_callbacks,
-    const events::callbacks_t& thread_callbacks,
-    const error_handling::callbacks_t& error_handling_callbacks
+    const events::callbacks_t& events_callbacks,
+    const error_handling::callbacks_t& error_handling_callbacks,
+    const threads::callbacks_t& threads_callbacks
 ) {
     ultramodern::rsp::set_callbacks(rsp_callbacks);
     ultramodern::renderer::set_callbacks(renderer_callbacks);
     ultramodern::set_audio_callbacks(audio_callbacks);
     ultramodern::input::set_callbacks(input_callbacks);
     (void)gfx_callbacks; // nothing yet
-    ultramodern::events::set_callbacks(thread_callbacks);
+    ultramodern::events::set_callbacks(events_callbacks);
     ultramodern::error_handling::set_callbacks(error_handling_callbacks);
+    ultramodern::threads::set_callbacks(threads_callbacks);
 }
 
 void ultramodern::preinit(RDRAM_ARG ultramodern::renderer::WindowHandle window_handle) {