Removed the ReadWrite mutex that protects the stat cache table. Instead implemented

separate stat cache tables per processor.  This eliminates the lock contention
that was occuring each time a cache node expired and had to be refreshed.
Having a stat cache per processor may cause some data redundancy but ensures
that no other thread will be refreshing a node at the same time a thread
is reading it.


git-svn-id: http://svn.apache.org/repos/asf/apr/apr/trunk@63523 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 18 insertions, 6 deletions

diff --git a/misc/netware/aprlib.def b/misc/netware/aprlib.def
index 0a2a01eb8..973612427 100644
--- a/misc/netware/aprlib.def
+++ b/misc/netware/aprlib.def
@@ -1,3 +1,4 @@
 MODULE  LIBC.NLM
 MODULE  WS2_32.NLM
+IMPORT  CpuCurrentProcessor
 EXPORT	@aprlib.imp
diff --git a/misc/netware/libprews.c b/misc/netware/libprews.c
index fa17427fa..8213636b8 100644
--- a/misc/netware/libprews.c
+++ b/misc/netware/libprews.c
@@ -15,10 +15,12 @@
 
 #include "apr_pools.h"
 
+#define MAX_PROCESSORS         128
+
 typedef struct app_data {
     int     initialized;
     void*   gPool;
-    void*   statCache;
+    void*   statCache[MAX_PROCESSORS];
 } APP_DATA;
 
 /* library-private data...*/
@@ -174,26 +176,35 @@ void* getGlobalPool()
     return NULL;
 }
 
-int setStatCache(void *data)
+int setStatCache(void *data, int proc)
 {
     APP_DATA *app_data = (APP_DATA*) get_app_data(gLibId);
 
+    if ((proc < 0) || (proc > (MAX_PROCESSORS-1))) {
+        data = NULL;
+        return 0;
+    }
+
     NXLock(gLibLock);
 
-    if (app_data && !app_data->statCache) {
-        app_data->statCache = data;
+    if (app_data && !app_data->statCache[proc]) {
+        app_data->statCache[proc] = data;
     }
 
     NXUnlock(gLibLock);
     return 1;
 }
 
-void* getStatCache()
+void* getStatCache(int proc)
 {
     APP_DATA *app_data = (APP_DATA*) get_app_data(gLibId);
 
+    if ((proc < 0) || (proc > (MAX_PROCESSORS-1))) {
+        return NULL;
+    }
+
     if (app_data) {
-        return app_data->statCache;
+        return app_data->statCache[proc];
     }
 
     return NULL;