WL#2360 Performance schema

Part V: performance schema implementation

1 files changed, 66 insertions, 0 deletions

diff --git a/storage/perfschema/pfs_global.cc b/storage/perfschema/pfs_global.cc
new file mode 100644
index 00000000000..cac7d0b06e7
--- /dev/null
+++ b/storage/perfschema/pfs_global.cc
@@ -0,0 +1,66 @@
+/* Copyright (C) 2008-2009 Sun Microsystems, Inc
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; version 2 of the License.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+/**
+  @file storage/perfschema/pfs_global.cc
+  Miscellaneous global dependencies (implementation).
+*/
+
+#include "my_global.h"
+#include "my_sys.h"
+#include "pfs_global.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+bool pfs_initialized= false;
+
+/**
+  Memory allocation for the performance schema.
+  The memory used internally in the performance schema implementation
+  is allocated once during startup, and considered static thereafter.
+*/
+void *pfs_malloc(size_t size, myf flags)
+{
+  DBUG_ASSERT(! pfs_initialized);
+  DBUG_ASSERT(size > 0);
+
+  void *ptr= malloc(size);
+  if (ptr && (flags & MY_ZEROFILL))
+    memset(ptr, 0, size);
+  return ptr;
+}
+
+void pfs_free(void *ptr)
+{
+  if (ptr != NULL)
+    free(ptr);
+}
+
+void pfs_print_error(const char *format, ...)
+{
+  va_list args;
+  va_start(args, format);
+  /*
+    Printing to anything else, like the error log, would generate even more
+    recursive calls to the performance schema implementation
+    (file io is instrumented), so that could lead to catastrophic results.
+    Printing to something safe, and low level: stderr only.
+  */
+  vfprintf(stderr, format, args);
+  va_end(args);
+  fflush(stderr);
+}
+