Lockless trace implementation

RTC: 35396
Change-Id: I96ea0d95606f04abb4dc2b0470345ca475b53912
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/2520
Tested-by: Jenkins Server
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

1 files changed, 98 insertions, 0 deletions

diff --git a/src/usr/trace/compdesc.C b/src/usr/trace/compdesc.C
new file mode 100644
index 000000000..92b306949
--- /dev/null
+++ b/src/usr/trace/compdesc.C
@@ -0,0 +1,98 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/trace/compdesc.C $                                    */
+/*                                                                        */
+/* IBM CONFIDENTIAL                                                       */
+/*                                                                        */
+/* COPYRIGHT International Business Machines Corp. 2012                   */
+/*                                                                        */
+/* p1                                                                     */
+/*                                                                        */
+/* Object Code Only (OCO) source materials                                */
+/* Licensed Internal Code Source Materials                                */
+/* IBM HostBoot Licensed Internal Code                                    */
+/*                                                                        */
+/* The source code for this program is not published or otherwise         */
+/* divested of its trade secrets, irrespective of what has been           */
+/* deposited with the U.S. Copyright Office.                              */
+/*                                                                        */
+/* Origin: 30                                                             */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+#include "compdesc.H"
+#include "service.H"
+#include <assert.h>
+#include <string.h>
+#include <string_ext.h>
+
+namespace TRACE
+{
+    ComponentDesc::ComponentDesc(const char* i_comp, uint32_t i_size,
+                                 uint8_t i_bufferType) :
+        iv_bufferType(i_bufferType), iv_debugEnabled(false),
+        iv_maxSize(i_size), iv_curSize(0),
+        iv_first(NULL), iv_last(NULL)
+    {
+        assert(iv_bufferType < BUFFER_COUNT);
+
+        memset(iv_compName, '\0', sizeof(iv_compName));
+        strcpy(iv_compName, i_comp); // No buffer overrun because of assert
+                                     // in ComponentList::getDescriptor.
+        strupr(iv_compName);
+
+        iv_compNameLen = strlen(iv_compName) + 1;
+    }
+
+    ComponentList::ComponentList() :
+        iv_components()
+    {
+        mutex_init(&iv_mutex);
+    };
+
+    ComponentList::~ComponentList()
+    {
+        mutex_destroy(&iv_mutex);
+    };
+
+    ComponentDesc* ComponentList::getDescriptor(const char* i_comp,
+                                                uint32_t i_size,
+                                                uint8_t i_bufferType)
+    {
+        ComponentDesc* l_rc = NULL;
+
+        assert(strlen(i_comp) < ComponentDesc::COMP_SIZE);
+
+        // Fix up the component name to be upper case.
+        char l_compName[ComponentDesc::COMP_SIZE];
+        memset(l_compName, '\0', sizeof(l_compName));
+        strcpy(l_compName, i_comp);
+        strupr(l_compName);
+
+        mutex_lock(&iv_mutex);
+
+        // Look for existing descriptor.
+        for(List::iterator i = iv_components.begin();
+            i != iv_components.end();
+            ++i)
+        {
+            if (0 == memcmp(&i->iv_compName, l_compName, sizeof(l_compName)))
+            {
+                l_rc = &(*i);
+                break;
+            }
+        }
+
+        // Insert new descriptor if none found.
+        if ((NULL == l_rc) && (i_size > 0))
+        {
+            iv_components.push_back(ComponentDesc(l_compName, i_size,
+                                                  i_bufferType));
+            l_rc = &iv_components.back();
+        }
+
+        mutex_unlock(&iv_mutex);
+        return l_rc;
+    }
+
+};