add condvar in kernel and app

user/src/bin/test_condvar.rs

@@ -0,0 +1,56 @@
+#![no_std]
+#![no_main]
+
+#[macro_use]
+extern crate user_lib;
+
+extern crate alloc;
+
+use user_lib::{condvar_create, condvar_signal, condvar_wait, mutex_blocking_create, mutex_lock, mutex_unlock};
+use user_lib::{thread_create, waittid, sleep};
+use user_lib::exit;
+use alloc::vec::Vec;
+
+static mut A: usize = 0;
+
+const CONDVAR_ID: usize = 0;
+const MUTEX_ID: usize = 0;
+
+unsafe fn first() -> ! {
+    sleep(10);
+    println!("First work, Change A --> 1 and wakeup Second");
+    mutex_lock(MUTEX_ID);
+    A=1;
+    condvar_signal(CONDVAR_ID);
+    mutex_unlock(MUTEX_ID);
+    exit(0)
+}
+
+unsafe fn second() -> ! {
+    println!("Second want to continue,but need to wait A=1");
+    mutex_lock(MUTEX_ID);
+    while A==0 {
+        println!("Second: A is {}", A);
+        condvar_wait(CONDVAR_ID, MUTEX_ID);
+    }
+    mutex_unlock(MUTEX_ID);
+    println!("A is {}, Second can work now", A);
+    exit(0)
+}
+
+#[no_mangle]
+pub fn main() -> i32 {
+    // create condvar & mutex
+    assert_eq!(condvar_create() as usize, CONDVAR_ID);
+    assert_eq!(mutex_blocking_create() as usize, MUTEX_ID);
+    // create threads
+    let mut threads = Vec::new();
+    threads.push(thread_create(first as usize, 0));
+    threads.push(thread_create(second as usize, 0));
+    // wait for all threads to complete
+    for thread in threads.iter() {
+        waittid(*thread as usize);
+    }
+    println!("test_condvar passed!");
+    0
+}