Add MutexSpin and several syscalls.

user/src/bin/race_adder_mutex_spin.rs

@@ -0,0 +1,44 @@
+#![no_std]
+#![no_main]
+
+#[macro_use]
+extern crate user_lib;
+extern crate alloc;
+
+use user_lib::{exit, thread_create, waittid, get_time};
+use user_lib::{mutex_create, mutex_lock, mutex_unlock};
+use alloc::vec::Vec;
+
+static mut A: usize = 0;
+const PER_THREAD: usize = 10000;
+const THREAD_COUNT: usize = 8;
+
+unsafe fn f() -> ! {
+    let mut t = 2usize;
+    for _ in 0..PER_THREAD {
+        mutex_lock(0);
+        let a = &mut A as *mut usize;
+        let cur = a.read_volatile();
+        for _ in 0..500 { t = t * t % 10007; }
+        a.write_volatile(cur + 1);
+        mutex_unlock(0);
+    }
+    exit(t as i32)
+}
+
+#[no_mangle]
+pub fn main() -> i32 {
+    let start = get_time();
+    assert_eq!(mutex_create(), 0);
+    let mut v = Vec::new();    
+    for _ in 0..THREAD_COUNT {
+        v.push(thread_create(f as usize) as usize);
+    }
+    let mut time_cost = Vec::new();
+    for tid in v.iter() {
+        time_cost.push(waittid(*tid));
+    }
+    println!("time cost is {}ms", get_time() - start);
+    assert_eq!(unsafe { A }, PER_THREAD * THREAD_COUNT);
+    0
+}

user/src/lib.rs

@@ -117,3 +117,8 @@ pub fn waittid(tid: usize) -> isize {
         }
     }
 }
+
+pub fn mutex_create() -> isize { sys_mutex_create() }
+pub fn mutex_lock(mutex_id: usize) { sys_mutex_lock(mutex_id); }
+pub fn mutex_unlock(mutex_id: usize) { sys_mutex_unlock(mutex_id); }
+

user/src/syscall.rs

@@ -14,6 +14,9 @@ const SYSCALL_WAITPID: usize = 260;
 const SYSCALL_THREAD_CREATE: usize = 1000;
 const SYSCALL_GETTID: usize = 1001;
 const SYSCALL_WAITTID: usize = 1002;
+const SYSCALL_MUTEX_CREATE: usize = 1010;
+const SYSCALL_MUTEX_LOCK: usize = 1011;
+const SYSCALL_MUTEX_UNLOCK: usize = 1012;
 
 fn syscall(id: usize, args: [usize; 3]) -> isize {
     let mut ret: isize;
@@ -93,3 +96,15 @@ pub fn sys_gettid() -> isize {
 pub fn sys_waittid(tid: usize) -> isize {
     syscall(SYSCALL_WAITTID, [tid, 0, 0])
 }
+
+pub fn sys_mutex_create() -> isize {
+    syscall(SYSCALL_MUTEX_CREATE, [0, 0, 0])
+}
+
+pub fn sys_mutex_lock(id: usize) -> isize {
+    syscall(SYSCALL_MUTEX_LOCK, [id, 0, 0])
+}
+
+pub fn sys_mutex_unlock(id: usize) -> isize {
+    syscall(SYSCALL_MUTEX_UNLOCK, [id, 0, 0])
+}