Revert 181883

> cc: Mark async texture uploads as completed from the upload thread.
> 
> This reduces the latency between when an upload completes and when the
> client is notified.
> 
> BUG=173802
> 
> 
> Review URL: https://chromiumcodereview.appspot.com/12213073

TBR=reveman@chromium.org
Review URL: https://codereview.chromium.org/12211144

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182063 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 21 insertions, 83 deletions

diff --git a/gpu/command_buffer/service/query_manager.cc b/gpu/command_buffer/service/query_manager.cc
index cc4de7a..51055e2 100644
--- a/gpu/command_buffer/service/query_manager.cc
+++ b/gpu/command_buffer/service/query_manager.cc
@@ -3,15 +3,13 @@
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/query_manager.h"
-
 #include "base/atomicops.h"
 #include "base/bind.h"
 #include "base/logging.h"
-#include "base/shared_memory.h"
 #include "base/time.h"
 #include "gpu/command_buffer/common/gles2_cmd_format.h"
-#include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
+#include "gpu/command_buffer/service/feature_info.h"
 #include "ui/gl/async_pixel_transfer_delegate.h"
 
 namespace gpu {
@@ -178,20 +176,10 @@ class AsyncPixelTransfersCompletedQuery
   virtual bool Process() OVERRIDE;
   virtual void Destroy(bool have_context) OVERRIDE;
 
+  void MarkAsCompletedCallback() { MarkAsCompleted(1); }
+
  protected:
   virtual ~AsyncPixelTransfersCompletedQuery();
-
-  static void MarkAsCompletedThreadSafe(
-      uint32 submit_count, const gfx::AsyncMemoryParams& mem_params) {
-    DCHECK(mem_params.shared_memory);
-    DCHECK(mem_params.shared_memory->memory());
-    void *data = static_cast<int8*>(mem_params.shared_memory->memory()) +
-        mem_params.shm_data_offset;
-    QuerySync* sync = static_cast<QuerySync*>(data);
-
-    // No need for a MemoryBarrier here as sync->result is not written.
-    sync->process_count = submit_count;
-  }
 };
 
 AsyncPixelTransfersCompletedQuery::AsyncPixelTransfersCompletedQuery(
@@ -204,41 +192,28 @@ bool AsyncPixelTransfersCompletedQuery::Begin() {
 }
 
 bool AsyncPixelTransfersCompletedQuery::End(uint32 submit_count) {
-  gfx::AsyncMemoryParams mem_params;
-  // Get the real shared memory since it might need to be duped to prevent
-  // use-after-free of the memory.
-  Buffer buffer = manager()->decoder()->GetSharedMemoryBuffer(shm_id());
-  if (!buffer.shared_memory)
-    return false;
-  mem_params.shared_memory = buffer.shared_memory;
-  mem_params.shm_size = buffer.size;
-  mem_params.shm_data_offset = shm_offset();
-  mem_params.shm_data_size = sizeof(QuerySync);
-
-  // Ask AsyncPixelTransferDelegate to run completion callback after all
-  // previous async transfers are done. No guarantee that callback is run
-  // on the current thread.
+  MarkAsPending(submit_count);
+
+  // This will call MarkAsCompleted(1) as a reply to a task on
+  // the async upload thread, such that it occurs after all previous
+  // async transfers have completed.
   manager()->decoder()->GetAsyncPixelTransferDelegate()->AsyncNotifyCompletion(
-      mem_params,
-      base::Bind(AsyncPixelTransfersCompletedQuery::MarkAsCompletedThreadSafe,
-                 submit_count));
+      base::Bind(
+          &AsyncPixelTransfersCompletedQuery::MarkAsCompletedCallback,
+          AsWeakPtr()));
+
+  // TODO(epenner): The async task occurs outside the normal
+  // flow, via a callback on this thread. Is there anything
+  // missing or wrong with that?
 
-  return AddToPendingTransferQueue(submit_count);
+  // TODO(epenner): Could we possibly trigger the completion on
+  // the upload thread by writing to the query shared memory
+  // directly?
+  return true;
 }
 
 bool AsyncPixelTransfersCompletedQuery::Process() {
-  QuerySync* sync = manager()->decoder()->GetSharedMemoryAs<QuerySync*>(
-      shm_id(), shm_offset(), sizeof(*sync));
-  if (!sync)
-    return false;
-
-  // Check if completion callback has been run. sync->process_count atomicity
-  // is guaranteed as this is already used to notify client of a completed
-  // query.
-  if (sync->process_count != submit_count())
-    return true;
-
-  UnmarkAsPending();
+  NOTREACHED();
   return true;
 }
 
@@ -460,7 +435,7 @@ bool QueryManager::ProcessPendingQueries() {
       return false;
     }
     if (query->pending()) {
-      break;
+      return true;
     }
     pending_queries_.pop_front();
   }
@@ -472,25 +447,6 @@ bool QueryManager::HavePendingQueries() {
   return !pending_queries_.empty();
 }
 
-bool QueryManager::ProcessPendingTransferQueries() {
-  while (!pending_transfer_queries_.empty()) {
-    Query* query = pending_transfer_queries_.front().get();
-    if (!query->Process()) {
-      return false;
-    }
-    if (query->pending()) {
-      break;
-    }
-    pending_transfer_queries_.pop_front();
-  }
-
-  return true;
-}
-
-bool QueryManager::HavePendingTransferQueries() {
-  return !pending_transfer_queries_.empty();
-}
-
 bool QueryManager::AddPendingQuery(Query* query, uint32 submit_count) {
   DCHECK(query);
   DCHECK(!query->IsDeleted());
@@ -502,17 +458,6 @@ bool QueryManager::AddPendingQuery(Query* query, uint32 submit_count) {
   return true;
 }
 
-bool QueryManager::AddPendingTransferQuery(Query* query, uint32 submit_count) {
-  DCHECK(query);
-  DCHECK(!query->IsDeleted());
-  if (!RemovePendingQuery(query)) {
-    return false;
-  }
-  query->MarkAsPending(submit_count);
-  pending_transfer_queries_.push_back(query);
-  return true;
-}
-
 bool QueryManager::RemovePendingQuery(Query* query) {
   DCHECK(query);
   if (query->pending()) {
@@ -526,13 +471,6 @@ bool QueryManager::RemovePendingQuery(Query* query) {
         break;
       }
     }
-    for (QueryQueue::iterator it = pending_transfer_queries_.begin();
-         it != pending_transfer_queries_.end(); ++it) {
-      if (it->get() == query) {
-        pending_transfer_queries_.erase(it);
-        break;
-      }
-    }
     if (!query->MarkAsCompleted(0)) {
       return false;
     }