exit_debugger(): Only try to release the semaphore when no one holds the

scheduler lock. Otherwise we may deadlock.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42182 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/debugger/invalidate_on_exit/Jamfile

@@ -1,7 +1,7 @@
 SubDir HAIKU_TOP src add-ons kernel debugger invalidate_on_exit ;
 
-UsePrivateHeaders kernel ;
+UsePrivateKernelHeaders ;
 
 KernelAddon <kdebug>invalidate_on_exit :
 	invalidate_on_exit.cpp
-	;
+;

src/add-ons/kernel/debugger/invalidate_on_exit/invalidate_on_exit.cpp

@@ -2,9 +2,15 @@
  * Copyright 2008, Michael Lotz, [email protected]
  * Distributed under the terms of the MIT License.
  */
+
+
 #include <debug.h>
+
 #include <signal.h>
 
+#include <kscheduler.h>
+#include <smp.h>
+
 
 static sem_id sRequestSem = -1;
 
@@ -33,6 +39,12 @@ invalidate_loop(void *data)
 static void
 exit_debugger()
 {
+	// If someone holds the scheduler lock at this point, release_sem_etc()
+	// will block forever. So avoid that.
+	if (!try_acquire_spinlock(&gSchedulerLock))
+		return;
+	release_spinlock(&gSchedulerLock);
+
 	release_sem_etc(sRequestSem, 1, B_DO_NOT_RESCHEDULE);
 }