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comparison src/os/linux/vm/os_linux.hpp @ 14909:4ca6dc0799b6

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Backout jdk9 merge
author Gilles Duboscq <duboscq@ssw.jku.at>
date Tue, 01 Apr 2014 13:57:07 +0200
parents bb9356ec5967
children 52b4284cb496
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14908:8db6e76cb658 14909:4ca6dc0799b6
1 /* 1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
27 27
28 // Linux_OS defines the interface to Linux operating systems 28 // Linux_OS defines the interface to Linux operating systems
29 29
30 /* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */ 30 /* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */
31 typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *); 31 typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
32
33 // Information about the protection of the page at address '0' on this os.
34 static bool zero_page_read_protected() { return true; }
35 32
36 class Linux { 33 class Linux {
37 friend class os; 34 friend class os;
38 friend class TestReserveMemorySpecial; 35 friend class TestReserveMemorySpecial;
39 36
203 // Real-time clock functions 200 // Real-time clock functions
204 static void clock_init(void); 201 static void clock_init(void);
205 202
206 // fast POSIX clocks support 203 // fast POSIX clocks support
207 static void fast_thread_clock_init(void); 204 static void fast_thread_clock_init(void);
205
206 static inline bool supports_monotonic_clock() {
207 return _clock_gettime != NULL;
208 }
208 209
209 static int clock_gettime(clockid_t clock_id, struct timespec *tp) { 210 static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
210 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; 211 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
211 } 212 }
212 213