[syslinux:lwip] exit_thread: make sure we don't run under scheduler lock

[syslinux-bot for H. Peter Anvin]

Commit-ID:  4db50faba162ad1c5803173ac562326934d016e1
Gitweb:     http://syslinux.zytor.com/commit/4db50faba162ad1c5803173ac562326934d016e1
Author:     H. Peter Anvin <hpa at zytor.com>
AuthorDate: Sat, 30 Apr 2011 12:09:41 -0700
Committer:  H. Peter Anvin <hpa at zytor.com>
CommitDate: Sat, 30 Apr 2011 12:09:41 -0700

exit_thread: make sure we don't run under scheduler lock

If we ever end up in __exit_thread with the scheduler locked, we're
completely fscked.

Signed-off-by: H. Peter Anvin <hpa at zytor.com>


---
 core/thread/exit_thread.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/core/thread/exit_thread.c b/core/thread/exit_thread.c
index f598624..47b8aed 100644
--- a/core/thread/exit_thread.c
+++ b/core/thread/exit_thread.c
@@ -3,6 +3,8 @@
 #include <stdlib.h>
 #include <klibc/compiler.h>
 
+extern int __schedule_lock;
+
 __noreturn __exit_thread(void)
 {
     irq_state_t irq;
@@ -10,6 +12,9 @@ __noreturn __exit_thread(void)
 
     irq = irq_save();
 
+    if (__schedule_lock)
+	kaboom();		/* Uh-oh... */
+
     /* Remove from the linked list */
     curr->list.prev->next = curr->list.next;
     curr->list.next->prev = curr->list.prev;