* CPUs can now be disabled - that is, they will keep idling.

* Added syscalls _kern_set_cpu_enabled() and _kern_cpu_enabled().
* scheduler.c::sRunQueue::tail was not maintained at all; changed sRunQueue to
  be a simple thread pointer instead of a struct thread_queue.
* Turns out we're monitoring CPU activity incorrectly when we've got more
  than one CPU.
* Renamed the global CPU array from "cpu" to gCPU.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16186 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/libroot/os/arch/x86/compatibility.c

@@ -1,5 +1,5 @@
 /*
- * Copyright 2005, Axel Dörfler, [email protected]. All rights reserved.
+ * Copyright 2005-2006, Axel Dörfler, [email protected]. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 
@@ -8,6 +8,8 @@
 
 #include <SupportDefs.h>
 
+#include <syscalls.h>
+
 
 int _kset_mon_limit_(int num);
 int _kset_fd_limit_(int num);
@@ -32,13 +34,13 @@ _kset_fd_limit_(int num)
 int
 _kget_cpu_state_(int cpuNum)
 {
-	return 1;
+	return _kern_cpu_enabled(cpuNum);
 }
 
 
 int
 _kset_cpu_state_(int cpuNum, int state)
 {
-	return state ? B_OK : B_ERROR;
+	return _kern_set_cpu_enabled(cpuNum, state != 0);
 }