Bug 1323100 - Create nsThreadPoolNaming::GetNextThreadName. r=froydnj

MozReview-Commit-ID: F0ZFFa5VkAW

--HG--
extra : rebase_source : b4ddac4a4d2f668c31beefb5cdfd737b01461c63

xpcom/glue/nsThreadUtils.cpp

@@ -440,13 +440,20 @@ NS_GetCurrentThread()
 #endif
 
 // nsThreadPoolNaming
+nsCString
+nsThreadPoolNaming::GetNextThreadName(const nsACString& aPoolName)
+{
+  nsCString name(aPoolName);
+  name.AppendLiteral(" #");
+  name.AppendInt(++mCounter, 10); // The counter is declared as atomic
+  return name;
+}
+ 
 void
 nsThreadPoolNaming::SetThreadPoolName(const nsACString& aPoolName,
                                       nsIThread* aThread)
 {
-  nsCString name(aPoolName);
-  name.AppendLiteral(" #");
-  name.AppendInt(++mCounter, 10); // The counter is declared as volatile
+  nsCString name = GetNextThreadName(aPoolName);
 
   if (aThread) {
     // Set on the target thread

xpcom/glue/nsThreadUtils.h

@@ -1037,6 +1037,17 @@ class nsThreadPoolNaming
 public:
   nsThreadPoolNaming() : mCounter(0) {}
 
+  /**
+   * Returns a thread name as "<aPoolName> #<n>" and increments the counter.
+   */
+  nsCString GetNextThreadName(const nsACString& aPoolName);
+
+  template<size_t LEN>
+  nsCString GetNextThreadName(const char (&aPoolName)[LEN])
+  {
+    return GetNextThreadName(nsDependentCString(aPoolName, LEN - 1));
+  }
+
   /**
    * Creates and sets next thread name as "<aPoolName> #<n>"
    * on the specified thread.  If no thread is specified (aThread