feat: add sys_acquire_mutex and sys_release_mutex

kernel/sysfile.c

@@ -504,12 +504,32 @@ sys_create_mutex(void)
 uint64
 sys_acquire_mutex(void)
 {
+  struct file *f;
+  int n;
+  uint64 p;
+
+  if(argfd(0,0, &f) < 0 || argint(2, &n) < 0 || argaddr(1, &p) < 0)
+    return -1;
+  if (f->type != FD_MUTEX)
+    return -1;
+  acquiresleep(&f->mutex);
   return 0;
 }
 
 uint64
 sys_release_mutex(void)
 {
+  struct file *f;
+  int n;
+  uint64 p;
+  if(argfd(0,0, &f) < 0 || argint(2, &n) < 0 || argaddr(1, &p) < 0)
+    return -1;
+  if (f->type != FD_MUTEX)
+    return -1;
 
+  if (myproc()->pid != f->mutex.pid){
+    return -1;
+  }
+  releasesleep(&f->mutex);
   return 0;
 }