From b51f047c28142cdfb7b24641006d0afdcf399292 Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Sun, 16 Aug 2015 02:18:47 +0200
Subject: codify locking contracts

Conflicts:
	vm/vm_page.h
---
 kern/exception.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'kern')

diff --git a/kern/exception.c b/kern/exception.c
index 63a63d6..5338274 100644
--- a/kern/exception.c
+++ b/kern/exception.c
@@ -454,6 +454,8 @@ exception_raise(
 	       (sizeof(struct mach_exception) <= receiver->ith_msize) &&
 	       ((receiver->ith_option & MACH_RCV_NOTIFY) == 0))) ||
 	    !thread_handoff(self, exception_raise_continue, receiver)) {
+		imq_lock_steal(reply_mqueue);
+		imq_lock_steal(dest_mqueue);
 		imq_unlock(reply_mqueue);
 		imq_unlock(dest_mqueue);
 		goto slow_exception_raise;
@@ -461,6 +463,8 @@ exception_raise(
 	counter(c_exception_raise_block++);
 
 	assert(current_thread() == receiver);
+	imq_lock_steal(reply_mqueue);
+	imq_lock_steal(dest_mqueue);
 
 	/*
 	 *	We need to finish preparing self for its
-- 
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