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-rw-r--r--indra/llcommon/llinstancetracker.cpp19
-rw-r--r--indra/llcommon/llinstancetracker.h105
2 files changed, 71 insertions, 53 deletions
diff --git a/indra/llcommon/llinstancetracker.cpp b/indra/llcommon/llinstancetracker.cpp
index f576204511..5dc3ea5d7b 100644
--- a/indra/llcommon/llinstancetracker.cpp
+++ b/indra/llcommon/llinstancetracker.cpp
@@ -35,14 +35,15 @@
//static
void * & LLInstanceTrackerBase::getInstances(std::type_info const & info)
{
- static std::map<std::string, void *> instances;
+ typedef std::map<std::string, void *> InstancesMap;
+ static InstancesMap instances;
- std::string k = info.name();
- if(instances.find(k) == instances.end())
- {
- instances[k] = NULL;
- }
-
- return instances[k];
+ // std::map::insert() is just what we want here. You attempt to insert a
+ // (key, value) pair. If the specified key doesn't yet exist, it inserts
+ // the pair and returns a std::pair of (iterator, true). If the specified
+ // key DOES exist, insert() simply returns (iterator, false). One lookup
+ // handles both cases.
+ return instances.insert(InstancesMap::value_type(info.name(),
+ InstancesMap::mapped_type()))
+ .first->second;
}
-
diff --git a/indra/llcommon/llinstancetracker.h b/indra/llcommon/llinstancetracker.h
index afb714c71c..936bef850a 100644
--- a/indra/llcommon/llinstancetracker.h
+++ b/indra/llcommon/llinstancetracker.h
@@ -29,6 +29,7 @@
#define LL_LLINSTANCETRACKER_H
#include <map>
+#include <typeinfo>
#include "string_table.h"
#include <boost/utility.hpp>
@@ -37,10 +38,40 @@
#include <boost/iterator/transform_iterator.hpp>
#include <boost/iterator/indirect_iterator.hpp>
+/**
+ * Base class manages "class-static" data that must actually have singleton
+ * semantics: one instance per process, rather than one instance per module as
+ * sometimes happens with data simply declared static.
+ */
class LL_COMMON_API LLInstanceTrackerBase : public boost::noncopyable
{
- protected:
- static void * & getInstances(std::type_info const & info);
+protected:
+ /// Get a process-unique void* pointer slot for the specified type_info
+ static void * & getInstances(std::type_info const & info);
+
+ /// Find or create a STATICDATA instance for the specified TRACKED class.
+ /// STATICDATA must be default-constructible.
+ template<typename STATICDATA, class TRACKED>
+ static STATICDATA& getStatic()
+ {
+ void *& instances = getInstances(typeid(TRACKED));
+ if (! instances)
+ {
+ instances = new STATICDATA;
+ }
+ return *static_cast<STATICDATA*>(instances);
+ }
+
+ /// It's not essential to derive your STATICDATA (for use with
+ /// getStatic()) from StaticBase; it's just that both known
+ /// implementations do.
+ struct StaticBase
+ {
+ StaticBase():
+ sIterationNestDepth(0)
+ {}
+ S32 sIterationNestDepth;
+ };
};
/// This mix-in class adds support for tracking all instances of the specified class parameter T
@@ -50,8 +81,15 @@ class LL_COMMON_API LLInstanceTrackerBase : public boost::noncopyable
template<typename T, typename KEY = T*>
class LLInstanceTracker : public LLInstanceTrackerBase
{
- typedef typename std::map<KEY, T*> InstanceMap;
typedef LLInstanceTracker<T, KEY> MyT;
+ typedef typename std::map<KEY, T*> InstanceMap;
+ struct StaticData: public StaticBase
+ {
+ InstanceMap sMap;
+ };
+ static StaticData& getStatic() { return LLInstanceTrackerBase::getStatic<StaticData, MyT>(); }
+ static InstanceMap& getMap_() { return getStatic().sMap; }
+
public:
class instance_iter : public boost::iterator_facade<instance_iter, T, boost::forward_traversal_tag>
{
@@ -61,12 +99,12 @@ public:
instance_iter(const typename InstanceMap::iterator& it)
: mIterator(it)
{
- ++sIterationNestDepth;
+ ++getStatic().sIterationNestDepth;
}
~instance_iter()
{
- --sIterationNestDepth;
+ --getStatic().sIterationNestDepth;
}
@@ -95,18 +133,18 @@ public:
key_iter(typename InstanceMap::iterator it)
: mIterator(it)
{
- ++sIterationNestDepth;
+ ++getStatic().sIterationNestDepth;
}
key_iter(const key_iter& other)
: mIterator(other.mIterator)
{
- ++sIterationNestDepth;
+ ++getStatic().sIterationNestDepth;
}
~key_iter()
{
- --sIterationNestDepth;
+ --getStatic().sIterationNestDepth;
}
@@ -159,8 +197,8 @@ protected:
virtual ~LLInstanceTracker()
{
// it's unsafe to delete instances of this type while all instances are being iterated over.
- llassert(sIterationNestDepth == 0);
- remove_();
+ llassert(getStatic().sIterationNestDepth == 0);
+ remove_();
}
virtual void setKey(KEY key) { remove_(); add_(key); }
virtual const KEY& getKey() const { return mInstanceKey; }
@@ -176,31 +214,24 @@ private:
getMap_().erase(mInstanceKey);
}
- static InstanceMap& getMap_()
- {
- void * & instances = getInstances(typeid(MyT));
- if (! instances)
- {
- instances = new InstanceMap;
- }
- return * static_cast<InstanceMap*>(instances);
- }
-
private:
-
KEY mInstanceKey;
- static S32 sIterationNestDepth;
};
-template <typename T, typename KEY> S32 LLInstanceTracker<T, KEY>::sIterationNestDepth = 0;
-
/// explicit specialization for default case where KEY is T*
/// use a simple std::set<T*>
template<typename T>
class LLInstanceTracker<T, T*> : public LLInstanceTrackerBase
{
- typedef typename std::set<T*> InstanceSet;
typedef LLInstanceTracker<T, T*> MyT;
+ typedef typename std::set<T*> InstanceSet;
+ struct StaticData: public StaticBase
+ {
+ InstanceSet sSet;
+ };
+ static StaticData& getStatic() { return LLInstanceTrackerBase::getStatic<StaticData, MyT>(); }
+ static InstanceSet& getSet_() { return getStatic().sSet; }
+
public:
/// for completeness of analogy with the generic implementation
@@ -213,18 +244,18 @@ public:
instance_iter(const typename InstanceSet::iterator& it)
: mIterator(it)
{
- ++sIterationNestDepth;
+ ++getStatic().sIterationNestDepth;
}
instance_iter(const instance_iter& other)
: mIterator(other.mIterator)
{
- ++sIterationNestDepth;
+ ++getStatic().sIterationNestDepth;
}
~instance_iter()
{
- --sIterationNestDepth;
+ --getStatic().sIterationNestDepth;
}
private:
@@ -250,13 +281,13 @@ public:
protected:
LLInstanceTracker()
{
- // it's safe but unpredictable to create instances of this type while all instances are being iterated over. I hate unpredictable. This assert will probably be turned on early in the next development cycle.
+ // it's safe but unpredictable to create instances of this type while all instances are being iterated over. I hate unpredictable. This assert will probably be turned on early in the next development cycle.
getSet_().insert(static_cast<T*>(this));
}
virtual ~LLInstanceTracker()
{
// it's unsafe to delete instances of this type while all instances are being iterated over.
- llassert(sIterationNestDepth == 0);
+ llassert(getStatic().sIterationNestDepth == 0);
getSet_().erase(static_cast<T*>(this));
}
@@ -264,20 +295,6 @@ protected:
{
getSet_().insert(static_cast<T*>(this));
}
-
- static InstanceSet& getSet_()
- {
- void * & instances = getInstances(typeid(MyT));
- if (! instances)
- {
- instances = new InstanceSet;
- }
- return * static_cast<InstanceSet *>(instances);
- }
-
- static S32 sIterationNestDepth;
};
-template <typename T> S32 LLInstanceTracker<T, T*>::sIterationNestDepth = 0;
-
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-01 19:52:05 +0000