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sim: ScopedMigration does nothing if both eqs are the same

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Added a check to avoid unlocking/locking the same event queue. Also,
added an optional parameter to enable the migration to be skipped. This
can be useful to disable the synchronization for certain runtime
conditions.

Change-Id: I4b03b3ffff4f9503153cd41dd8aa78705bf16cc4
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/5730
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
This commit is contained in:
Tiago Muck
2017-09-08 12:24:42 -05:00
committed by Andreas Sandberg
parent 9b4e797cdd
commit 1033838e11
1 changed files with 16 additions and 8 deletions
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24
src/sim/eventq.hh
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@@ -542,28 +542,36 @@ class EventQueue
* example, be useful when performing IO across thread event
* queues when timing is not crucial (e.g., during fast
* forwarding).
*
* ScopedMigration does nothing if both eqs are the same
*/
class ScopedMigration
{
public:
ScopedMigration(EventQueue *_new_eq)
: new_eq(*_new_eq), old_eq(*curEventQueue())
ScopedMigration(EventQueue *_new_eq, bool _doMigrate = true)
:new_eq(*_new_eq), old_eq(*curEventQueue()),
doMigrate((&new_eq != &old_eq)&&_doMigrate)
{
old_eq.unlock();
new_eq.lock();
curEventQueue(&new_eq);
if (doMigrate){
old_eq.unlock();
new_eq.lock();
curEventQueue(&new_eq);
}
}
~ScopedMigration()
{
new_eq.unlock();
old_eq.lock();
curEventQueue(&old_eq);
if (doMigrate){
new_eq.unlock();
old_eq.lock();
curEventQueue(&old_eq);
}
}
private:
EventQueue &new_eq;
EventQueue &old_eq;
bool doMigrate;
};
/**