From: acevest <zhaoyanbai@126.com>
Date: Mon, 15 Jul 2024 12:11:08 +0000 (+0800)
Subject: 修复信号量的down逻辑可能引起调度异常的问题
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/doc/man.7.ps?a=commitdiff_plain;h=51e4c85ca53a84381d3d92180d636d4ab47cabb5;p=kernel.git

修复信号量的down逻辑可能引起调度异常的问题
---

diff --git a/kernel/semaphore.c b/kernel/semaphore.c
index 19b08b5..a38696c 100644
--- a/kernel/semaphore.c
+++ b/kernel/semaphore.c
@@ -41,11 +41,11 @@ volatile void down(semaphore_t *s) {
         INIT_LIST_HEAD(&waiter.list);
         list_add(&waiter.list, &s->wait_list);
 
-        irq_restore(iflags);
-
         task->state = TASK_WAIT;
         task->reason = "down";
 
+        irq_restore(iflags);
+
         schedule();
     }
 }