From 31789cec4f59f7a6fd1e92eac523c595a7b102ac Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sat, 28 Sep 2013 10:51:12 +0200
Subject: Make schema version access (but not modification) thread-safe

Also cache the version in statements so that we don't have to lock
the mutex (slow) every time we need to check the version.
---
 odb/pgsql/section-statements.hxx | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'odb/pgsql/section-statements.hxx')

diff --git a/odb/pgsql/section-statements.hxx b/odb/pgsql/section-statements.hxx
index d75fd66..e7dcd9e 100644
--- a/odb/pgsql/section-statements.hxx
+++ b/odb/pgsql/section-statements.hxx
@@ -10,11 +10,14 @@
 #include <cstddef> // std::size_t
 
 #include <odb/forward.hxx>
+#include <odb/schema-version.hxx>
 #include <odb/traits.hxx>
 
 #include <odb/pgsql/version.hxx>
 #include <odb/pgsql/binding.hxx>
 #include <odb/pgsql/statement.hxx>
+#include <odb/pgsql/connection.hxx>
+#include <odb/pgsql/database.hxx>
 #include <odb/pgsql/pgsql-fwd.hxx> // Oid
 #include <odb/pgsql/details/export.hxx>
 
@@ -49,6 +52,15 @@ namespace odb
       connection_type&
       connection () {return conn_;}
 
+      const schema_version_migration&
+      version_migration (const char* name = "") const
+      {
+        if (svm_ == 0)
+          svm_ = &conn_.database ().schema_version_migration (name);
+
+        return *svm_;
+      }
+
       image_type&
       image () {return image_;}
 
@@ -152,6 +164,7 @@ namespace odb
 
     protected:
       connection_type& conn_;
+      mutable const schema_version_migration* svm_;
 
       // These come from object_statements.
       //
-- 
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