implement some more posix apis

include/re_thread.h

@@ -25,11 +25,47 @@ typedef int (*thread_h)(void *);
 #define THREAD_ONCE_FLAG_INIT 0
 typedef int thread_once_flag;
 
+/**
+ * Creates a new thread
+ *
+ * @param thr  Pointer to new thread
+ * @param func Function to execute
+ * @param arg  Argument to pass to the function
+ *
+ * @return 0 if success, otherwise errorcode
+ */
 int thread_create(thread *thr, thread_h func, void *arg);
+
+/**
+ * Checks whether lhs and rhs refer to the same thread.
+ *
+ * @return Non-zero value if lhs and rhs refer to the same value, 0 otherwise.
+ */
 int thread_equal(thread lhs, thread rhs);
+
+/**
+ * @return the identifier of the calling thread.
+ */
 thread thread_current(void);
+
+/**
+ * Detaches the thread identified by thr from the current environment.
+ *
+ * @return 0 if success, otherwise errorcode
+ */
 int thread_detach(thread thr);
+
+/**
+ * Blocks the current thread until the thread identified by thr finishes
+ * execution
+ *
+ * @param thr Thread
+ * @param res Result code location
+ *
+ * @return 0 if success, otherwise errorcode
+ */
 int thread_join(thread thr, int *res);
+
 int thread_once(thread_once_flag *flag, void (*func)(void));
 void thread_exit(int res);
 

src/thread/posix.c

@@ -28,15 +28,6 @@ static void *thread_handler(void *p)
 }
 
 
-/**
- * Create thread
- *
- * @param thr  Thread
- * @param func Function
- * @param arg  ARG
- *
- * @return 0 if success, otherwise errorcode
- */
 int thread_create(thread *thr, thread_h func, void *arg)
 {
 	struct th *th;
@@ -50,11 +41,43 @@ int thread_create(thread *thr, thread_h func, void *arg)
 		return ENOMEM;
 
 	th->func = func;
-	th->arg	= arg;
+	th->arg	 = arg;
 
 	err = pthread_create(thr, NULL, thread_handler, th);
 	if (err)
 		mem_deref(th);
 
 	return err;
 }
+
+
+int thread_equal(thread lhs, thread rhs)
+{
+	return pthread_equal(lhs, rhs);
+}
+
+
+thread thread_current(void)
+{
+	return pthread_self();
+}
+
+
+int thread_detach(thread thr)
+{
+	return pthread_detach(thr);
+}
+
+
+int thread_join(thread thr, int *res)
+{
+	void *code;
+	int err;
+
+	err = pthread_join(thr, &code);
+
+	if (res)
+		*res = (int)(intptr_t)code;
+
+	return err;
+}