add libc testcase.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1061 bbd45198-f89e-11dd-88c7-29a3b14d5316

examples/libc/ex6.c

@@ -0,0 +1,37 @@
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <pthread.h>
+#include <unistd.h>
+
+#define usleep rt_thread_sleep
+
+static void *test_thread(void *v_param) {
+	return NULL;
+}
+
+int libc_ex6(void) {
+	unsigned long count;
+
+	setvbuf(stdout, NULL, _IONBF, 0);
+
+	for (count = 0; count < 2000; ++count) {
+		pthread_t thread;
+		int status;
+
+		status = pthread_create(&thread, NULL, test_thread, NULL);
+		if (status != 0) {
+			printf("status = %d, count = %lu: %s\n", status, count, strerror(
+					errno));
+			return 1;
+		} else {
+			printf("count = %lu\n", count);
+		}
+		/* pthread_detach (thread); */
+		pthread_join(thread, NULL);
+		usleep(10);
+	}
+	return 0;
+}
+#include <finsh.h>
+FINSH_FUNCTION_EXPORT(libc_ex6, example 6 for libc);