added IPC syscalls

kernel/thread/thread.h

@@ -16,12 +16,24 @@
 #include "../arch/context.h"
 #include "../object/queue.h"
 #include "../types.h"
+#include "../sync/semaphore.h"
 
 #include "../memory/pagetable.h"
 
 /// Stack size for each thread
 constexpr uint32_t STACK_SIZE = 3072;
 
+
+struct IpcStruct {
+	uintptr_t ptr;
+	size_t size;
+	int pid;
+	bool is_answer;
+	IpcStruct* queue_link = nullptr;
+};
+
+
+
 /*! \brief The Thread is an object used by the scheduler.
  *  \ingroup thread
  */
@@ -79,6 +91,12 @@ class Thread {
 	pagetable_t* appcode_table;
 	pagetable_t* appstack_table;
 
+	Semaphore ipc_sem;
+	Queue<IpcStruct> ipc_queue;
+
+
+
+
 	/*! \brief Unique thread id */
 	const int id;