1 files changed, 10 insertions, 12 deletions

diff --git a/Source/JavaScriptCore/API/JSContextRef.cpp b/Source/JavaScriptCore/API/JSContextRef.cpp
index 92e03a671..7a57287de 100644
--- a/Source/JavaScriptCore/API/JSContextRef.cpp
+++ b/Source/JavaScriptCore/API/JSContextRef.cpp
@@ -78,7 +78,6 @@ JSGlobalContextRef JSGlobalContextCreate(JSClassRef globalObjectClass)
     // If the application was linked before JSGlobalContextCreate was changed to use a unique JSGlobalData,
     // we use a shared one for backwards compatibility.
     if (NSVersionOfLinkTimeLibrary("JavaScriptCore") <= webkitFirstVersionWithConcurrentGlobalContexts) {
-        JSLock lock(LockForReal);
         return JSGlobalContextCreateInGroup(toRef(&JSGlobalData::sharedInstance()), globalObjectClass);
     }
 #endif // OS(DARWIN)
@@ -90,11 +89,9 @@ JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClass
 {
     initializeThreading();
 
-    JSLock lock(LockForReal);
     RefPtr<JSGlobalData> globalData = group ? PassRefPtr<JSGlobalData>(toJS(group)) : JSGlobalData::createContextGroup(ThreadStackTypeSmall);
 
     APIEntryShim entryShim(globalData.get(), false);
-
     globalData->makeUsableFromMultipleThreads();
 
     if (!globalObjectClass) {
@@ -124,18 +121,19 @@ JSGlobalContextRef JSGlobalContextRetain(JSGlobalContextRef ctx)
 
 void JSGlobalContextRelease(JSGlobalContextRef ctx)
 {
+    IdentifierTable* savedIdentifierTable;
     ExecState* exec = toJS(ctx);
-    JSLock lock(exec);
+    {
+        JSLockHolder lock(exec);
 
-    JSGlobalData& globalData = exec->globalData();
-    IdentifierTable* savedIdentifierTable = wtfThreadData().setCurrentIdentifierTable(globalData.identifierTable);
+        JSGlobalData& globalData = exec->globalData();
+        savedIdentifierTable = wtfThreadData().setCurrentIdentifierTable(globalData.identifierTable);
 
-    bool protectCountIsZero = Heap::heap(exec->dynamicGlobalObject())->unprotect(exec->dynamicGlobalObject());
-    if (protectCountIsZero) {
-        globalData.heap.activityCallback()->synchronize();
-        globalData.heap.reportAbandonedObjectGraph();
+        bool protectCountIsZero = Heap::heap(exec->dynamicGlobalObject())->unprotect(exec->dynamicGlobalObject());
+        if (protectCountIsZero)
+            globalData.heap.reportAbandonedObjectGraph();
+        globalData.deref();
     }
-    globalData.deref();
 
     wtfThreadData().setCurrentIdentifierTable(savedIdentifierTable);
 }
@@ -166,7 +164,7 @@ JSGlobalContextRef JSContextGetGlobalContext(JSContextRef ctx)
 JSStringRef JSContextCreateBacktrace(JSContextRef ctx, unsigned maxStackSize)
 {
     ExecState* exec = toJS(ctx);
-    JSLock lock(exec);
+    JSLockHolder lock(exec);
 
     unsigned count = 0;
     UStringBuilder builder;