updates from ch9

user/src/sync.rs

@@ -0,0 +1,32 @@
+use super::*;
+
+pub fn mutex_create() -> isize {
+    sys_mutex_create(false)
+}
+pub fn mutex_blocking_create() -> isize {
+    sys_mutex_create(true)
+}
+pub fn mutex_lock(mutex_id: usize) {
+    sys_mutex_lock(mutex_id);
+}
+pub fn mutex_unlock(mutex_id: usize) {
+    sys_mutex_unlock(mutex_id);
+}
+pub fn semaphore_create(res_count: usize) -> isize {
+    sys_semaphore_create(res_count)
+}
+pub fn semaphore_up(sem_id: usize) {
+    sys_semaphore_up(sem_id);
+}
+pub fn semaphore_down(sem_id: usize) {
+    sys_semaphore_down(sem_id);
+}
+pub fn condvar_create() -> isize {
+    sys_condvar_create(0)
+}
+pub fn condvar_signal(condvar_id: usize) {
+    sys_condvar_signal(condvar_id);
+}
+pub fn condvar_wait(condvar_id: usize, mutex_id: usize) {
+    sys_condvar_wait(condvar_id, mutex_id);
+}