user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/tests/posix/pthread_thread_local.c

@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <pthread.h>
+#include <assert.h>
+ 
+_Thread_local unsigned int counter = 9999; 
+_Thread_local unsigned int uninitialized;
+ 
+void *check_counter(void *arg)
+{
+	(void)arg;
+	fprintf(stderr, "counter for worker thread: %d, at %p\n", counter, &counter);
+	fflush(stderr);
+	assert(counter == 9999);
+
+	fprintf(stderr, "uninitialized data for worker thread: %d, at %p\n", uninitialized, &uninitialized);
+	fflush(stderr);
+	assert(uninitialized == 0);
+
+	++counter;
+	++uninitialized;
+	fprintf(stderr, "counter for worker thread: %d\n", counter);
+	fflush(stderr);
+	assert(counter == 10000);
+	assert(uninitialized == 1);
+	return NULL;
+}
+ 
+int main()
+{
+	fprintf(stderr, "counter for main thread: %d, at %p\n", counter, &counter);
+	fflush(stderr);
+	assert(counter == 9999);
+
+	fprintf(stderr, "uninitialized data for main thread: %d, at %p\n", uninitialized, &uninitialized);
+	fflush(stderr);
+	assert(uninitialized == 0);
+
+	++counter;
+	++uninitialized;
+	fprintf(stderr, "counter for main: %d\n", counter);
+	fflush(stderr);
+	assert(counter == 10000);
+	assert(uninitialized == 1);
+
+	pthread_t thd;
+	pthread_create(&thd, NULL, check_counter, NULL);
+	pthread_join(thd, NULL);
+
+	fprintf(stderr, "counter for main: %d\n", counter);
+	fflush(stderr);
+	assert(counter == 10000);
+	assert(uninitialized == 1);
+
+	return 0;
+}