--- include/log4cxx/helpers/pool.h	2006/11/09 15:34:58
+++ include/log4cxx/helpers/pool.h	2006/11/22 14:29:44
@@ -36,6 +36,17 @@
 
                         char* palloc(size_t length);
 
+                        /**
+                         * Set the threshold of unused pool memory at which the
+                         * APR allocator starts giving back memory blocks.
+                         *
+                         * @param size  number of allowed unused bytes
+                         */
+                        static void setMaxFreeThreshold(size_t size);
+
+                        /** Default threshold for setMaxFreeThreshold() */
+                        enum { DEFAULT_THRESHOLD = 40960 };
+
                 protected:
                         log4cxx_pool_t* pool;
                         const bool release;
--- src/aprinitializer.cpp	2006/11/09 15:34:58
+++ src/aprinitializer.cpp	2006/11/26 23:05:06
@@ -20,6 +20,7 @@
 #include <apr_time.h>
 #include <assert.h>
 #include <log4cxx/helpers/threadspecificdata.h>
+#include <log4cxx/helpers/pool.h>
 
 using namespace log4cxx::helpers;
 using namespace log4cxx;
@@ -30,6 +31,7 @@
     apr_initialize();
     apr_pool_create(&p, NULL);
     apr_atomic_init(p);
+    Pool::setMaxFreeThreshold(Pool::DEFAULT_THRESHOLD);
     startTime = apr_time_now();
 #if APR_HAS_THREADS
     apr_status_t stat = apr_threadkey_private_create(&tlsKey, tlsDestruct, p);
--- src/pool.cpp	2006/11/09 15:34:58
+++ src/pool.cpp	2006/11/26 23:05:06
@@ -18,6 +18,7 @@
 #include <log4cxx/helpers/pool.h>
 #include <log4cxx/helpers/exception.h>
 #include <log4cxx/helpers/aprinitializer.h>
+#include <apr_allocator.h>
 #include <apr_pools.h>
 #include <assert.h>
 
@@ -52,3 +53,10 @@
 char* Pool::palloc(size_t size) {
   return (char*) apr_palloc((apr_pool_t*) pool, size);
 }
+
+void Pool::setMaxFreeThreshold(size_t size) {
+    // the allocator may be zero if APR_POOL_DEBUG is defined
+    apr_allocator_t* allocator = apr_pool_allocator_get(APRInitializer::getRootPool());
+    if (allocator)
+        apr_allocator_max_free_set(allocator, size);
+}