SL-17483: Merge branch 'track-threadpools' into sl-17483.

This picks up ThreadPoolSizes override logic embedded in ThreadPool's
constructor, plus the new static ThreadPool::getConfiguredWidth() and
getWidth() methods.

1 files changed, 32 insertions, 2 deletions

diff --git a/indra/llcommon/threadpool.h b/indra/llcommon/threadpool.h
index b79c9b9090..b49d511257 100644
--- a/indra/llcommon/threadpool.h
+++ b/indra/llcommon/threadpool.h
@@ -22,14 +22,25 @@
 namespace LL
 {
 
-    class ThreadPool
+    class ThreadPool: public LLInstanceTracker<ThreadPool, std::string>
     {
+    private:
+        using super = LLInstanceTracker<ThreadPool, std::string>;
     public:
         /**
          * Pass ThreadPool a string name. This can be used to look up the
          * relevant WorkQueue.
+         *
+         * The number of threads you pass sets the compile-time default. But
+         * if the user has overridden the LLSD map in the "ThreadPoolSizes"
+         * setting with a key matching this ThreadPool name, that setting
+         * overrides this parameter.
+         *
+         * Pass an explicit capacity to limit the size of the queue.
+         * Constraining the queue can cause a submitter to block. Do not
+         * constrain any ThreadPool accepting work from the main thread.
          */
-        ThreadPool(const std::string& name, size_t threads=1, size_t capacity=1024);
+        ThreadPool(const std::string& name, size_t threads=1, size_t capacity=1024*1024);
         virtual ~ThreadPool();
 
         /**
@@ -57,6 +68,25 @@ namespace LL
          */
         virtual void run();
 
+        /**
+         * getConfiguredWidth() returns the setting, if any, for the specified
+         * ThreadPool name. Returns dft if the "ThreadPoolSizes" map does not
+         * contain the specified name.
+         */
+        static
+        size_t getConfiguredWidth(const std::string& name, size_t dft=0);
+
+        /**
+         * This getWidth() returns the width of the instantiated ThreadPool
+         * with the specified name, if any. If no instance exists, returns its
+         * getConfiguredWidth() if any. If there's no instance and no relevant
+         * override, return dft. Presumably dft should match the threads
+         * parameter passed to the ThreadPool constructor call that will
+         * eventually instantiate the ThreadPool with that name.
+         */
+        static
+        size_t getWidth(const std::string& name, size_t dft);
+
     private:
         void run(const std::string& name);