From d2db11479fee516433ec36d206adc17b5d40cbcf Mon Sep 17 00:00:00 2001
From: kishoramballi <kishoramballi>
Date: Mon, 11 May 2009 11:52:48 +0000
Subject: [PATCH] version 1.0

---
 src/storage/Util.cxx | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 src/storage/Util.cxx

diff --git a/src/storage/Util.cxx b/src/storage/Util.cxx
new file mode 100644
index 00000000..cbf61164
--- /dev/null
+++ b/src/storage/Util.cxx
@@ -0,0 +1,53 @@
+#include<Util.h>
+#include<Config.h>
+
+DbRetVal GlobalUniqueID::create()
+{
+    int key = Conf::config.getShmIDKey();
+    int id = os::shm_create(key, MAX_UNIQUE_ID *sizeof(int), 0666);
+    if (-1 == id) {
+	    printError(ErrOS, "Unable to create shared memory");
+	    return ErrOS;
+    }
+    ptr = os::shm_attach(id, NULL, 0);
+    if ((void*)-1 == ptr) {
+        printError(ErrOS, "Unable to attach shared memory");
+	    return ErrOS;
+    }
+    memset(ptr, 0, MAX_UNIQUE_ID *sizeof(int));
+}
+   
+DbRetVal GlobalUniqueID::open() 
+{
+    int key = Conf::config.getShmIDKey();
+    int id = os::shm_open(key, MAX_UNIQUE_ID *sizeof(int), 0666);
+    if (-1 == id) {
+        printError(ErrOS, "Unable to create shared memory");
+    }
+    ptr = os::shm_attach(id, NULL, 0);
+    if ((void*)-1 == ptr) {
+        printError(ErrOS, "Unable to create shared memory");
+    }
+    return OK;
+}
+
+DbRetVal GlobalUniqueID::destroy()
+{
+    int key = Conf::config.getShmIDKey();
+    int id = os::shm_open(key, MAX_UNIQUE_ID *sizeof(int), 0666);
+    if (-1 == id) {
+        printError(ErrOS, "Unable to open shared memory");
+        return ErrOS;
+    }
+    os::shmctl(id, IPC_RMID);
+}
+
+int GlobalUniqueID::getID(UniqueIDType type)
+{
+    int *id = (int*)(((char*)ptr) + sizeof(int) * type);
+    int oldVal = *id;
+    int ret = Mutex::CAS(id, oldVal, oldVal+1);
+    if (ret) return -1;
+    return *id;
+}
+
-- 
2.11.4.GIT