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mutex 'er up 

Some overzealous locking to track down RequestObject related crashes.

bc0fa4d689 wrongly locked the current event loop's
request_invalidation_lock instead of the invalidation's list lock.

Also Abstract UI is able to delete requests concurrently with with
EventLoop invalidation.
e.g. PortManager::PortRegisteredOrUnregistered  and GlobalPortMatrixWindow
so the lock needs to be exposed.

If this solves various issues, mutexes should to be consolidated
(request_buffer_map_lock + request_invalidation_lock) and be chosen
such that there is as little contention as possible.
This commit is contained in:
Robin Gareus 2016-12-13 23:46:55 +01:00
parent 176625d9e0
commit fa07233a17
6 changed files with 16 additions and 6 deletions
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3
libs/pbd/event_loop.cc
View File

@ -60,7 +60,7 @@ EventLoop::set_event_loop_for_thread (EventLoop* loop)
void*
EventLoop::invalidate_request (void* data)
{
InvalidationRecord* ir = (InvalidationRecord*) data;
InvalidationRecord* ir = (InvalidationRecord*) data;
/* Some of the requests queued with an EventLoop may involve functors
* that make method calls to objects whose lifetime is shorter
@ -88,6 +88,7 @@ EventLoop::invalidate_request (void* data)
if (ir->event_loop) {
Glib::Threads::Mutex::Lock lm (ir->event_loop->slot_invalidation_mutex());
Glib::Threads::Mutex::Lock lr (ir->event_loop->request_invalidation_mutex());
for (list<BaseRequestObject*>::iterator i = ir->requests.begin(); i != ir->requests.end(); ++i) {
(*i)->valid = false;
(*i)->invalidation = 0;

7
libs/pbd/pbd/abstract_ui.cc
View File

@ -240,7 +240,8 @@ AbstractUI<RequestObject>::handle_ui_requests ()
request_buffer_map_lock.lock ();
if (vec.buf[0]->invalidation) {
DEBUG_TRACE (PBD::DEBUG::AbstractUI, string_compose ("%1: removing invalidation record for that request\n", event_loop_name()));
Glib::Threads::Mutex::Lock lm (request_invalidation_lock);
assert (vec.buf[0]->invalidation->event_loop);
Glib::Threads::Mutex::Lock lm (vec.buf[0]->invalidation->event_loop->request_invalidation_mutex());
if (!(*i).second->dead) {
vec.buf[0]->invalidation->requests.remove (vec.buf[0]);
}
@ -257,6 +258,7 @@ AbstractUI<RequestObject>::handle_ui_requests ()
/* clean up any dead request buffers (their thread has exited) */
Glib::Threads::Mutex::Lock lr (request_invalidation_lock);
for (i = request_buffers.begin(); i != request_buffers.end(); ) {
if ((*i).second->dead) {
DEBUG_TRACE (PBD::DEBUG::AbstractUI, string_compose ("%1/%2 deleting dead per-thread request buffer for %3 @ %4\n",
@ -304,8 +306,9 @@ AbstractUI<RequestObject>::handle_ui_requests ()
*/
if (req->invalidation) {
Glib::Threads::Mutex::Lock lm (request_invalidation_lock);
DEBUG_TRACE (PBD::DEBUG::AbstractUI, string_compose ("%1/%2 remove request from its invalidation list\n", event_loop_name(), pthread_name()));
assert (req->invalidation->event_loop && req->invalidation->event_loop != this);
Glib::Threads::Mutex::Lock lm (req->invalidation->event_loop->request_invalidation_mutex());
/* after this call, if the object referenced by the
* invalidation record is deleted, it will no longer

3
libs/pbd/pbd/abstract_ui.h
View File

@ -60,7 +60,8 @@ class ABSTRACT_UI_API AbstractUI : public BaseUI
void register_thread (pthread_t, std::string, uint32_t num_requests);
void call_slot (EventLoop::InvalidationRecord*, const boost::function<void()>&);
Glib::Threads::Mutex& slot_invalidation_mutex() { return request_buffer_map_lock; }
Glib::Threads::Mutex& slot_invalidation_mutex() { return request_buffer_map_lock; }
Glib::Threads::Mutex& request_invalidation_mutex() { return request_invalidation_lock; }
Glib::Threads::Mutex request_buffer_map_lock;
Glib::Threads::Mutex request_invalidation_lock;

5
libs/pbd/pbd/event_loop.h
View File

@ -76,9 +76,10 @@ class LIBPBD_API EventLoop
};
virtual void call_slot (InvalidationRecord*, const boost::function<void()>&) = 0;
virtual Glib::Threads::Mutex& slot_invalidation_mutex() = 0;
virtual Glib::Threads::Mutex& slot_invalidation_mutex() = 0;
virtual Glib::Threads::Mutex& request_invalidation_mutex() = 0;
std::string event_loop_name() const { return _name; }
std::string event_loop_name() const { return _name; }
static EventLoop* get_event_loop_for_thread();
static void set_event_loop_for_thread (EventLoop* ui);

2
session_utils/common.cc
View File

@ -77,10 +77,12 @@ class MyEventLoop : public sigc::trackable, public EventLoop
}
Glib::Threads::Mutex& slot_invalidation_mutex() { return request_buffer_map_lock; }
Glib::Threads::Mutex& request_invalidation_mutex() { return request_invalidation_lock; }
private:
Glib::Threads::Thread* run_loop_thread;
Glib::Threads::Mutex request_buffer_map_lock;
Glib::Threads::Mutex request_invalidation_lock;
};
static MyEventLoop *event_loop;

2
tools/luadevel/luasession.cc
View File

@ -109,10 +109,12 @@ class MyEventLoop : public sigc::trackable, public EventLoop
}
Glib::Threads::Mutex& slot_invalidation_mutex () { return request_buffer_map_lock; }
Glib::Threads::Mutex& request_invalidation_mutex() { return request_invalidation_lock; }
private:
Glib::Threads::Thread* run_loop_thread;
Glib::Threads::Mutex request_buffer_map_lock;
Glib::Threads::Mutex request_invalidation_lock;
};
static MyEventLoop *event_loop = NULL;