Implement safepointing of threads

runtime/vm/compiler.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 1040 matching lines @@
         if (thread()->IsMutatorThread()) {
           FinalizeCompilation(&assembler, &graph_compiler, flow_graph);
         } else {
           // This part of compilation must be at a safepoint.
           // Stop mutator thread before creating the instruction object and
           // installing code.
           // Mutator thread may not run code while we are creating the
           // instruction object, since the creation of instruction object
           // changes code page access permissions (makes them temporary not
           // executable).
-          isolate()->thread_registry()->SafepointThreads();
           {
+            SafepointOperationScope safepoint_scope(thread());
             // Do not Garbage collect during this stage and instead allow the
             // heap to grow.
             NoHeapGrowthControlScope no_growth_control;
             FinalizeCompilation(&assembler, &graph_compiler, flow_graph);
           }
-          isolate()->thread_registry()->ResumeAllThreads();
           if (isolate()->heap()->NeedsGarbageCollection()) {
             isolate()->heap()->CollectAllGarbage();
           }
         }
       }
       // Mark that this isolate now has compiled code.
       isolate()->set_has_compiled_code(true);
       // Exit the loop and the function with the correct result value.
       is_compiled = true;
       done = true;
@@ skipping 813 matching lines @@
     MonitorLocker ml(task->queue_monitor_);
     task->running_ = false;
     // 'task' will be deleted by thread pool.
     task = NULL;
     ml.Notify();   // Stop waiting for the queue.
   }
 
   {
     MonitorLocker ml_done(done_monitor);
     while (!(*task_done)) {
-      // In case that the compiler is waiting for safepoint.
-      Isolate::Current()->thread_registry()->CheckSafepoint();
-      ml_done.Wait(1);
+      ml_done.WaitWithSafepointCheck(Thread::Current());
     }
   }
   delete task_done;
   delete done_monitor;
   delete queue_monitor;
   delete function_queue;
   Isolate::Current()->set_background_compiler(NULL);
 }
 
 
@@ skipping 127 matching lines @@
 }
 
 
 void BackgroundCompiler::EnsureInit(Thread* thread) {
   UNREACHABLE();
 }
 
 #endif  // DART_PRECOMPILED_RUNTIME
 
 }  // namespace dart