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#include <unistd.h>
#include <iostream>
#include "pbd/stacktrace.h"
#include "pbd/abstract_ui.h"
#include "pbd/pthread_utils.h"
#include "pbd/failed_constructor.h"
#include "i18n.h"
using namespace std;
static void do_not_delete_the_request_buffer (void*) { }
template<typename R>
Glib::StaticPrivate<typename AbstractUI<R>::RequestBuffer> AbstractUI<R>::per_thread_request_buffer;
template <typename RequestObject>
AbstractUI<RequestObject>::AbstractUI (const string& name)
: BaseUI (name)
{
void (AbstractUI<RequestObject>::*pmf)(string,pthread_t,string,uint32_t) = &AbstractUI<RequestObject>::register_thread;
/* better to make this connect a handler that runs in the UI event loop but the syntax seems hard, and
register_thread() is thread safe anyway.
*/
PBD::ThreadCreatedWithRequestSize.connect_same_thread (new_thread_connection, boost::bind (pmf, this, _1, _2, _3, _4));
}
template <typename RequestObject> void
AbstractUI<RequestObject>::register_thread (string target_gui, pthread_t thread_id, string /*thread name*/, uint32_t num_requests)
{
if (target_gui != name()) {
return;
}
RequestBuffer* b = new RequestBuffer (num_requests);
{
Glib::Mutex::Lock lm (request_buffer_map_lock);
request_buffers[thread_id] = b;
}
per_thread_request_buffer.set (b, do_not_delete_the_request_buffer);
}
template <typename RequestObject> RequestObject*
AbstractUI<RequestObject>::get_request (RequestType rt)
{
RequestBuffer* rbuf = per_thread_request_buffer.get ();
RequestBufferVector vec;
if (rbuf != 0) {
/* we have a per-thread FIFO, use it */
rbuf->get_write_vector (&vec);
if (vec.len[0] == 0) {
return 0;
}
vec.buf[0]->type = rt;
return vec.buf[0];
}
RequestObject* req = new RequestObject;
req->type = rt;
return req;
}
template <typename RequestObject> void
AbstractUI<RequestObject>::handle_ui_requests ()
{
RequestBufferMapIterator i;
RequestBufferVector vec;
/* per-thread buffers first */
request_buffer_map_lock.lock ();
for (i = request_buffers.begin(); i != request_buffers.end(); ++i) {
while (true) {
/* we must process requests 1 by 1 because
the request may run a recursive main
event loop that will itself call
handle_ui_requests. when we return
from the request handler, we cannot
expect that the state of queued requests
is even remotely consistent with
the condition before we called it.
*/
i->second->get_read_vector (&vec);
if (vec.len[0] == 0) {
break;
} else {
request_buffer_map_lock.unlock ();
do_request (vec.buf[0]);
request_buffer_map_lock.lock ();
i->second->increment_read_ptr (1);
}
}
}
request_buffer_map_lock.unlock ();
/* and now, the generic request buffer. same rules as above apply */
Glib::Mutex::Lock lm (request_list_lock);
while (!request_list.empty()) {
RequestObject* req = request_list.front ();
request_list.pop_front ();
lm.release ();
do_request (req);
delete req;
lm.acquire();
}
}
template <typename RequestObject> void
AbstractUI<RequestObject>::send_request (RequestObject *req)
{
if (base_instance() == 0) {
return; /* XXX is this the right thing to do ? */
}
if (caller_is_self ()) {
do_request (req);
} else {
RequestBuffer* rbuf = per_thread_request_buffer.get ();
if (rbuf != 0) {
rbuf->increment_write_ptr (1);
} else {
/* no per-thread buffer, so just use a list with a lock so that it remains
single-reader/single-writer semantics
*/
Glib::Mutex::Lock lm (request_list_lock);
request_list.push_back (req);
}
request_channel.wakeup ();
}
}
template<typename RequestObject> void
AbstractUI<RequestObject>::call_slot (const boost::function<void()>& f)
{
if (caller_is_self()) {
#ifndef NDEBUG
if (getenv ("DEBUG_THREADED_SIGNALS")) {
std::cerr << "functor called in correct thread for " << name() << " , execute ...\n";
}
#endif
f ();
return;
}
RequestObject *req = get_request (BaseUI::CallSlot);
if (req == 0) {
return;
}
req->the_slot = f;
#ifndef NDEBUG
if (getenv ("DEBUG_THREADED_SIGNALS")) {
std::cerr << "functor called in wrong thread for " << name() << " (from " << pthread_name() << ") send request ...\n";
}
#endif
send_request (req);
}
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