initial code repo

[stor4nfv.git] / src / ceph / src / common / dout.h

diff --git a/src/ceph/src/common/dout.h b/src/ceph/src/common/dout.h
new file mode 100644 (file)
index 0000000..29863a5
--- /dev/null
+++ b/src/ceph/src/common/dout.h
@@ -0,0 +1,86 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2010 Sage Weil <sage@newdream.net>
+ * Copyright (C) 2010 Dreamhost
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_DOUT_H
+#define CEPH_DOUT_H
+
+#include <type_traits>
+
+#include "global/global_context.h"
+#include "common/config.h"
+#include "common/likely.h"
+#include "common/Clock.h"
+#include "log/Log.h"
+
+extern void dout_emergency(const char * const str);
+extern void dout_emergency(const std::string &str);
+
+// intentionally conflict with endl
+class _bad_endl_use_dendl_t { public: _bad_endl_use_dendl_t(int) {} };
+static const _bad_endl_use_dendl_t endl = 0;
+inline std::ostream& operator<<(std::ostream& out, _bad_endl_use_dendl_t) {
+  assert(0 && "you are using the wrong endl.. use std::endl or dendl");
+  return out;
+}
+
+class DoutPrefixProvider {
+public:
+  virtual string gen_prefix() const = 0;
+  virtual CephContext *get_cct() const = 0;
+  virtual unsigned get_subsys() const = 0;
+  virtual ~DoutPrefixProvider() {}
+};
+
+// generic macros
+#define dout_prefix *_dout
+
+#define dout_impl(cct, sub, v)                                         \
+  do {                                                                 \
+  if (cct->_conf->subsys.should_gather(sub, v)) {                      \
+    if (0) {                                                           \
+      char __array[((v >= -1) && (v <= 200)) ? 0 : -1] __attribute__((unused)); \
+    }                                                                  \
+    static size_t _log_exp_length = 80;                                \
+    ceph::logging::Entry *_dout_e = cct->_log->create_entry(v, sub, &_log_exp_length); \
+    ostream _dout_os(&_dout_e->m_streambuf);                           \
+    static_assert(std::is_convertible<decltype(&*cct),                         \
+                                     CephContext* >::value,            \
+                 "provided cct must be compatible with CephContext*"); \
+    auto _dout_cct = cct;                                              \
+    std::ostream* _dout = &_dout_os;
+
+#define lsubdout(cct, sub, v)  dout_impl(cct, ceph_subsys_##sub, v) dout_prefix
+#define ldout(cct, v)  dout_impl(cct, dout_subsys, v) dout_prefix
+#define lderr(cct) dout_impl(cct, ceph_subsys_, -1) dout_prefix
+
+#define ldpp_dout(dpp, v) if (dpp) dout_impl(dpp->get_cct(), dpp->get_subsys(), v) (*_dout << dpp->gen_prefix())
+
+#define lgeneric_subdout(cct, sub, v) dout_impl(cct, ceph_subsys_##sub, v) *_dout
+#define lgeneric_dout(cct, v) dout_impl(cct, ceph_subsys_, v) *_dout
+#define lgeneric_derr(cct) dout_impl(cct, ceph_subsys_, -1) *_dout
+
+#define ldlog_p1(cct, sub, lvl)                 \
+  (cct->_conf->subsys.should_gather((sub), (lvl)))
+
+// NOTE: depend on magic value in _ASSERT_H so that we detect when
+// /usr/include/assert.h clobbers our fancier version.
+#define dendl_impl std::flush;                         \
+  _ASSERT_H->_log->submit_entry(_dout_e);              \
+    }                                          \
+  } while (0)
+
+#define dendl dendl_impl
+
+#endif