Add custom pm sysmodule

sysmodules/pm/source/my_thread.c

@@ -0,0 +1,35 @@
+#include <3ds.h>
+#include "my_thread.h"
+
+static void _thread_begin(void* arg)
+{
+    MyThread *t = (MyThread *)arg;
+    t->ep(t->p);
+    MyThread_Exit();
+}
+
+Result MyThread_Create(MyThread *t, void (*entrypoint)(void *p), void *p, void *stack, u32 stackSize, int prio, int affinity)
+{
+    t->ep       = entrypoint;
+    t->p        = p;
+    t->stacktop = (u8 *)stack + stackSize;
+
+    return svcCreateThread(&t->handle, _thread_begin, (u32)t, (u32*)t->stacktop, prio, affinity);
+}
+
+Result MyThread_Join(MyThread *thread, s64 timeout_ns)
+{
+    if (thread == NULL) return 0;
+    Result res = svcWaitSynchronization(thread->handle, timeout_ns);
+    if(R_FAILED(res)) return res;
+
+    svcCloseHandle(thread->handle);
+    thread->handle = (Handle)0;
+
+    return res;
+}
+
+void MyThread_Exit(void)
+{
+    svcExitThread();
+}