os_bsd.hpp revision 5990:b0133e4187d3 
1/*
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.
4 *
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
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#ifndef OS_BSD_VM_OS_BSD_HPP
26#define OS_BSD_VM_OS_BSD_HPP
27
28// Bsd_OS defines the interface to Bsd operating systems
29
30// Information about the protection of the page at address '0' on this os.
31static bool zero_page_read_protected() { return true; }
32
33/* pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1 */
34typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
35
36#ifdef __APPLE__
37// Mac OS X doesn't support clock_gettime. Stub out the type, it is
38// unused
39typedef int clockid_t;
40#endif
41
42class Bsd {
43  friend class os;
44
45  // For signal-chaining
46#define MAXSIGNUM 32
47  static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
48  static unsigned int sigs;             // mask of signals that have
49                                        // preinstalled signal handlers
50  static bool libjsig_is_loaded;        // libjsig that interposes sigaction(),
51                                        // __sigaction(), signal() is loaded
52  static struct sigaction *(*get_signal_action)(int);
53  static struct sigaction *get_preinstalled_handler(int);
54  static void save_preinstalled_handler(int, struct sigaction&);
55
56  static void check_signal_handler(int sig);
57
58  // For signal flags diagnostics
59  static int sigflags[MAXSIGNUM];
60
61  static int (*_clock_gettime)(clockid_t, struct timespec *);
62
63  static GrowableArray<int>* _cpu_to_node;
64
65 protected:
66
67  static julong _physical_memory;
68  static pthread_t _main_thread;
69  static int _page_size;
70
71  static julong available_memory();
72  static julong physical_memory() { return _physical_memory; }
73  static void initialize_system_info();
74
75  static bool supports_variable_stack_size();
76
77  static void rebuild_cpu_to_node_map();
78  static GrowableArray<int>* cpu_to_node()    { return _cpu_to_node; }
79
80  static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
81
82 public:
83
84  static void init_thread_fpu_state();
85  static pthread_t main_thread(void)                                { return _main_thread; }
86
87  static void hotspot_sigmask(Thread* thread);
88
89  static bool is_initial_thread(void);
90  static pid_t gettid();
91
92  static int page_size(void)                                        { return _page_size; }
93  static void set_page_size(int val)                                { _page_size = val; }
94
95  static address   ucontext_get_pc(ucontext_t* uc);
96  static intptr_t* ucontext_get_sp(ucontext_t* uc);
97  static intptr_t* ucontext_get_fp(ucontext_t* uc);
98
99  // For Analyzer Forte AsyncGetCallTrace profiling support:
100  //
101  // This interface should be declared in os_bsd_i486.hpp, but
102  // that file provides extensions to the os class and not the
103  // Bsd class.
104  static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
105    intptr_t** ret_sp, intptr_t** ret_fp);
106
107  // This boolean allows users to forward their own non-matching signals
108  // to JVM_handle_bsd_signal, harmlessly.
109  static bool signal_handlers_are_installed;
110
111  static int get_our_sigflags(int);
112  static void set_our_sigflags(int, int);
113  static void signal_sets_init();
114  static void install_signal_handlers();
115  static void set_signal_handler(int, bool);
116  static bool is_sig_ignored(int sig);
117
118  static sigset_t* unblocked_signals();
119  static sigset_t* vm_signals();
120  static sigset_t* allowdebug_blocked_signals();
121
122  // For signal-chaining
123  static struct sigaction *get_chained_signal_action(int sig);
124  static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
125
126  // Minimum stack size a thread can be created with (allowing
127  // the VM to completely create the thread and enter user code)
128  static size_t min_stack_allowed;
129
130  // Return default stack size or guard size for the specified thread type
131  static size_t default_stack_size(os::ThreadType thr_type);
132  static size_t default_guard_size(os::ThreadType thr_type);
133
134  // Real-time clock functions
135  static void clock_init(void);
136
137  static inline bool supports_monotonic_clock() {
138    return _clock_gettime != NULL;
139  }
140
141  static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
142    return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
143  }
144
145  // Stack repair handling
146
147  // none present
148
149  // BsdThreads work-around for 6292965
150  static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
151
152private:
153  typedef int (*sched_getcpu_func_t)(void);
154  typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
155  typedef int (*numa_max_node_func_t)(void);
156  typedef int (*numa_available_func_t)(void);
157  typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
158  typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
159
160  static sched_getcpu_func_t _sched_getcpu;
161  static numa_node_to_cpus_func_t _numa_node_to_cpus;
162  static numa_max_node_func_t _numa_max_node;
163  static numa_available_func_t _numa_available;
164  static numa_tonode_memory_func_t _numa_tonode_memory;
165  static numa_interleave_memory_func_t _numa_interleave_memory;
166  static unsigned long* _numa_all_nodes;
167
168  static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
169  static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
170  static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
171  static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
172  static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
173  static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
174  static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
175public:
176  static int sched_getcpu()  { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
177  static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
178    return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
179  }
180  static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
181  static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
182  static int numa_tonode_memory(void *start, size_t size, int node) {
183    return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
184  }
185  static void numa_interleave_memory(void *start, size_t size) {
186    if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
187      _numa_interleave_memory(start, size, _numa_all_nodes);
188    }
189  }
190  static int get_node_by_cpu(int cpu_id);
191};
192
193
194class PlatformEvent : public CHeapObj<mtInternal> {
195  private:
196    double CachePad [4] ;   // increase odds that _mutex is sole occupant of cache line
197    volatile int _Event ;
198    volatile int _nParked ;
199    pthread_mutex_t _mutex  [1] ;
200    pthread_cond_t  _cond   [1] ;
201    double PostPad  [2] ;
202    Thread * _Assoc ;
203
204  public:       // TODO-FIXME: make dtor private
205    ~PlatformEvent() { guarantee (0, "invariant") ; }
206
207  public:
208    PlatformEvent() {
209      int status;
210      status = pthread_cond_init (_cond, NULL);
211      assert_status(status == 0, status, "cond_init");
212      status = pthread_mutex_init (_mutex, NULL);
213      assert_status(status == 0, status, "mutex_init");
214      _Event   = 0 ;
215      _nParked = 0 ;
216      _Assoc   = NULL ;
217    }
218
219    // Use caution with reset() and fired() -- they may require MEMBARs
220    void reset() { _Event = 0 ; }
221    int  fired() { return _Event; }
222    void park () ;
223    void unpark () ;
224    int  TryPark () ;
225    int  park (jlong millis) ;
226    void SetAssociation (Thread * a) { _Assoc = a ; }
227};
228
229class PlatformParker : public CHeapObj<mtInternal> {
230  protected:
231    pthread_mutex_t _mutex [1] ;
232    pthread_cond_t  _cond  [1] ;
233
234  public:       // TODO-FIXME: make dtor private
235    ~PlatformParker() { guarantee (0, "invariant") ; }
236
237  public:
238    PlatformParker() {
239      int status;
240      status = pthread_cond_init (_cond, NULL);
241      assert_status(status == 0, status, "cond_init");
242      status = pthread_mutex_init (_mutex, NULL);
243      assert_status(status == 0, status, "mutex_init");
244    }
245};
246
247#endif // OS_BSD_VM_OS_BSD_HPP
248