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