*/
+#include <cstring>
+
+#include <pthread.h>
+
+#include "pbd/compose.h"
+#include "pbd/debug.h"
#include "pbd/event_loop.h"
+#include "pbd/error.h"
#include "pbd/stacktrace.h"
+#include "i18n.h"
+
using namespace PBD;
using namespace std;
Glib::Threads::Private<EventLoop> EventLoop::thread_event_loop (do_not_delete_the_loop_pointer);
+Glib::Threads::RWLock EventLoop::thread_buffer_requests_lock;
+EventLoop::ThreadRequestBufferList EventLoop::thread_buffer_requests;
+EventLoop::RequestBufferSuppliers EventLoop::request_buffer_suppliers;
+
+EventLoop::EventLoop (string const& name)
+ : _name (name)
+{
+}
+
EventLoop*
-EventLoop::get_event_loop_for_thread() {
+EventLoop::get_event_loop_for_thread()
+{
return thread_event_loop.get ();
}
* want, and many of the objects we want to do this with already
* inherit (indirectly) from sigc::trackable.
*/
-
+
if (ir->event_loop) {
Glib::Threads::Mutex::Lock lm (ir->event_loop->slot_invalidation_mutex());
for (list<BaseRequestObject*>::iterator i = ir->requests.begin(); i != ir->requests.end(); ++i) {
return 0;
}
+vector<EventLoop::ThreadBufferMapping>
+EventLoop::get_request_buffers_for_target_thread (const std::string& target_thread)
+{
+ vector<ThreadBufferMapping> ret;
+ Glib::Threads::RWLock::WriterLock lm (thread_buffer_requests_lock);
+
+ for (ThreadRequestBufferList::const_iterator x = thread_buffer_requests.begin();
+ x != thread_buffer_requests.end(); ++x) {
+
+ if (x->second.target_thread_name == target_thread) {
+ ret.push_back (x->second);
+ }
+ }
+
+ DEBUG_TRACE (PBD::DEBUG::EventLoop, string_compose ("for thread \"%1\", found %2 request buffers\n", target_thread, ret.size()));
+
+ return ret;
+}
+
+void
+EventLoop::register_request_buffer_factory (const string& target_thread_name,
+ void* (*factory)(uint32_t))
+{
+
+ RequestBufferSupplier trs;
+ trs.name = target_thread_name;
+ trs.factory = factory;
+
+ {
+ Glib::Threads::RWLock::WriterLock lm (thread_buffer_requests_lock);
+ request_buffer_suppliers.push_back (trs);
+ }
+}
+
+void
+EventLoop::pre_register (const string& emitting_thread_name, uint32_t num_requests)
+{
+ /* Threads that need to emit signals "towards" other threads, but with
+ RT safe behavior may be created before the receiving threads
+ exist. This makes it impossible for them to use the
+ ThreadCreatedWithRequestSize signal to notify receiving threads of
+ their existence.
+
+ This function creates a request buffer for them to use with
+ the (not yet) created threads, and stores it where the receiving
+ thread can find it later.
+ */
+
+ ThreadBufferMapping mapping;
+ Glib::Threads::RWLock::ReaderLock lm (thread_buffer_requests_lock);
+
+ for (RequestBufferSuppliers::iterator trs = request_buffer_suppliers.begin(); trs != request_buffer_suppliers.end(); ++trs) {
+
+ if (!trs->factory) {
+ /* no factory - no request buffer required or expected */
+ continue;
+ }
+
+ if (emitting_thread_name == trs->name) {
+ /* no need to register an emitter with itself */
+ continue;
+ }
+
+ mapping.emitting_thread = pthread_self();
+ mapping.target_thread_name = trs->name;
+
+ /* Allocate a suitably sized request buffer. This will set the
+ * thread-local variable that holds a pointer to this request
+ * buffer.
+ */
+ mapping.request_buffer = trs->factory (num_requests);
+
+ /* now store it where the receiving thread (trs->name) can find
+ it if and when it is created. (Discovery happens in the
+ AbstractUI constructor. Note that if
+ */
+
+ const string key = string_compose ("%1/%2", mapping.emitting_thread, mapping.target_thread_name);
+
+ /* note that there is no cleanup mechanism to remove
+ * dead/out-of-date entries from this map.
+ *
+ * the request buffers themselves will be cleaned up
+ * when the requesting thread exits (by the
+ * thread-local-storage (TLS) cleanup mechanism).
+ *
+ * but an entry will remain in the map.
+ *
+ * really need a way to register some end-of-thread callback
+ * that will remove the entry from the thread_buffer_requests
+ * container. but there is no such thing in the pthreads API
+ *
+ * the target thread only searches the map once, when the event
+ * loop object is constructed. if it finds invalid buffers
+ * it will (a) never get any requests for them anyway (b) will
+ * find them marked "dead" and delete them.
+ */
+
+ thread_buffer_requests[key] = mapping;
+ DEBUG_TRACE (PBD::DEBUG::EventLoop, string_compose ("pre-registered request buffer for \"%1\" to send to \"%2\", buffer @ %3 (key was %4)\n",
+ emitting_thread_name, trs->name, mapping.request_buffer, key));
+ }
+}
+
projects / ardour.git / blobdiff