add fork test & wait test

Author: 刘丰源

test/usr/fork_test.rs

@@ -0,0 +1,37 @@
+#![no_std]
+#![no_main]
+
+#[macro_use]
+extern crate user;
+
+use user::syscall::sys_fork;
+
+#[no_mangle]
+pub fn main() -> usize {
+    let tid = sys_fork();
+    let tid = sys_fork();
+    if tid == 0 {
+        println!("I am child");
+    } else {
+        println!("I am father");
+    }
+    println!("ret tid is: {}", tid);
+    0
+}
+
+/*
+out put:
+
+I am child
+ret tid is: 0
+thread 3 exited, exit code = 0
+I am father
+ret tid is: 3
+thread 2 exited, exit code = 0
+I am child
+ret tid is: 0
+thread 4 exited, exit code = 0
+I am father
+ret tid is: 4
+thread 1 exited, exit code = 0
+*/

test/usr/wait_test.rs

@@ -0,0 +1,58 @@
+#![no_std]
+#![no_main]
+
+#[macro_use]
+extern crate user;
+
+use user::syscall::{sys_exit as exit, sys_yield as yield_now, sys_fork as fork, sys_wait as waitpid};
+
+#[no_mangle]
+pub fn main() -> isize {
+    let magic: usize = 0x10384;
+    let mut pid: usize = 0;
+    let mut code: i32 = 0;
+    println!("I am the parent. Forking the child...");
+    pid = fork() as usize;
+    if (pid == 0) {
+        println!("I am the child.");
+        yield_now();
+        yield_now();
+        yield_now();
+        yield_now();
+        yield_now();
+        yield_now();
+        yield_now();
+        exit(magic);
+    }
+    else {
+        println!("I am parent, fork a child pid {}", pid);
+    }
+    if pid <= 0 {
+        panic!("pid <= 0");
+    }
+    println!("I am the parent, waiting now..");
+    let wait_pid = waitpid(pid, &mut code);
+    println!("{}, {:x}", wait_pid, code);
+    if wait_pid != 0 || code != magic as i32 {
+        panic!("wait_test1 fail");
+    }
+    if !(waitpid(pid, &mut code) != 0) {
+        panic!("wait_test2 fail");
+    }
+    println!("waitpid {} ok.", pid);
+    println!("wait_test pass.");
+    return 0;
+}
+
+/*
+out put:
+
+I am the parent. Forking the child...
+I am the child.
+I am parent, fork a child pid 2
+I am the parent, waiting now..
+thread 2 exited, exit code = 66436
+waitpid 2 ok.
+wait_test pass.
+thread 1 exited, exit code = 0
+*/