diff src/os/aix/vm/misc_aix.hpp @ 9665:4338b5465f50

8140645: Recent Developments for AIX Summary: Port recent developments from SAP for AIX to the OpenJDK Reviewed-by: goetz
author stuefe
date Fri, 30 Oct 2015 12:36:54 +0100
parents
children ce87b1141c12
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/os/aix/vm/misc_aix.hpp	Fri Oct 30 12:36:54 2015 +0100
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+/*
+ * Copyright 2012, 2015 SAP AG. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+
+#ifndef OS_AIX_VM_MISC_AIX_HPP
+#define OS_AIX_VM_MISC_AIX_HPP
+
+// misc_aix.hpp, misc_aix.cpp: convenience functions needed for the OpenJDK AIX
+// port.
+#include "utilities/globalDefinitions.hpp"
+
+#include <pthread.h>
+
+// Trace if verbose to tty.
+#define trcVerbose(fmt, ...) { \
+  if (Verbose) { \
+    fprintf(stderr, fmt, ##__VA_ARGS__); \
+    fputc('\n', stderr); fflush(stderr); \
+  } \
+}
+#define ERRBYE(s) { trcVerbose(s); return -1; }
+#define trc(fmt, ...)
+
+#define assert0(b) assert((b), "")
+#define guarantee0(b) guarantee((b), "")
+template <class T1, class T2> bool is_aligned_to(T1 what, T2 alignment) {
+  return (((uintx)(what)) & (((uintx)(alignment)) - 1)) == 0 ? true : false;
+}
+
+// CritSect: simple critical section implementation using pthread mutexes.
+namespace MiscUtils {
+  typedef pthread_mutex_t critsect_t;
+
+  void init_critsect(MiscUtils::critsect_t* cs);
+  void free_critsect(MiscUtils::critsect_t* cs);
+  void enter_critsect(MiscUtils::critsect_t* cs);
+  void leave_critsect(MiscUtils::critsect_t* cs);
+
+  // Need to wrap this in an object because we need to dynamically initialize
+  // critical section (because of windows, where there is no way to initialize
+  // a CRITICAL_SECTION statically. On Unix, we could use
+  // PTHREAD_MUTEX_INITIALIZER).
+
+  // Note: The critical section does NOT get cleaned up in the destructor. That is
+  // by design: the CritSect class is only ever used as global objects whose
+  // lifetime spans the whole VM life; in that context we don't want the lock to
+  // be cleaned up when global C++ objects are destroyed, but to continue to work
+  // correctly right to the very end of the process life.
+  class CritSect {
+    critsect_t _cs;
+   public:
+    CritSect()        { init_critsect(&_cs); }
+    //~CritSect()       { free_critsect(&_cs); }
+    void enter()      { enter_critsect(&_cs); }
+    void leave()      { leave_critsect(&_cs); }
+  };
+
+  class AutoCritSect {
+    CritSect* const _pcsobj;
+   public:
+    AutoCritSect(CritSect* pcsobj)
+      : _pcsobj(pcsobj)
+    {
+      _pcsobj->enter();
+    }
+    ~AutoCritSect() {
+      _pcsobj->leave();
+    }
+  };
+
+  // Returns true if pointer can be dereferenced without triggering a segment
+  // violation. Returns false if pointer is invalid.
+  // Note: Depends on stub routines; prior to stub routine generation, will
+  // always return true. Use CanUseSafeFetch32 to handle this case.
+  bool is_readable_pointer(const void* p);
+
+}
+
+#endif // OS_AIX_VM_MISC_AIX_HPP
+