rev 6280 : [mq]: osx-clock

   1 /*
   2  * Copyright (c) 1999, 2014, 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.
  31 static bool zero_page_read_protected() { return true; }
  32 
  33 /* pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1 */
  34 typedef 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
  39 typedef int clockid_t;
  40 #endif
  41 
  42 class 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 #ifdef __APPLE__
  62   // mach_absolute_time
  63   static mach_timebase_info_data_t _timebase_info;
  64   static volatile uint64_t         _max_abstime;
  65 #else
  66   static int (*_clock_gettime)(clockid_t, struct timespec *);
  67 #endif
  68 
  69   static GrowableArray<int>* _cpu_to_node;
  70 
  71  protected:
  72 
  73   static julong _physical_memory;
  74   static pthread_t _main_thread;
  75   static int _page_size;
  76 
  77   static julong available_memory();
  78   static julong physical_memory() { return _physical_memory; }
  79   static void initialize_system_info();
  80 
  81   static bool supports_variable_stack_size();
  82 
  83   static void rebuild_cpu_to_node_map();
  84   static GrowableArray<int>* cpu_to_node()    { return _cpu_to_node; }
  85 
  86   static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
  87 
  88  public:
  89 
  90   static void init_thread_fpu_state();
  91   static pthread_t main_thread(void)                                { return _main_thread; }
  92 
  93   static void hotspot_sigmask(Thread* thread);
  94 
  95   static bool is_initial_thread(void);
  96   static pid_t gettid();
  97 
  98   static int page_size(void)                                        { return _page_size; }
  99   static void set_page_size(int val)                                { _page_size = val; }
 100 
 101   static address   ucontext_get_pc(ucontext_t* uc);
 102   static intptr_t* ucontext_get_sp(ucontext_t* uc);
 103   static intptr_t* ucontext_get_fp(ucontext_t* uc);
 104 
 105   // For Analyzer Forte AsyncGetCallTrace profiling support:
 106   //
 107   // This interface should be declared in os_bsd_i486.hpp, but
 108   // that file provides extensions to the os class and not the
 109   // Bsd class.
 110   static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
 111     intptr_t** ret_sp, intptr_t** ret_fp);
 112 
 113   // This boolean allows users to forward their own non-matching signals
 114   // to JVM_handle_bsd_signal, harmlessly.
 115   static bool signal_handlers_are_installed;
 116 
 117   static int get_our_sigflags(int);
 118   static void set_our_sigflags(int, int);
 119   static void signal_sets_init();
 120   static void install_signal_handlers();
 121   static void set_signal_handler(int, bool);
 122   static bool is_sig_ignored(int sig);
 123 
 124   static sigset_t* unblocked_signals();
 125   static sigset_t* vm_signals();
 126   static sigset_t* allowdebug_blocked_signals();
 127 
 128   // For signal-chaining
 129   static struct sigaction *get_chained_signal_action(int sig);
 130   static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
 131 
 132   // Minimum stack size a thread can be created with (allowing
 133   // the VM to completely create the thread and enter user code)
 134   static size_t min_stack_allowed;
 135 
 136   // Return default stack size or guard size for the specified thread type
 137   static size_t default_stack_size(os::ThreadType thr_type);
 138   static size_t default_guard_size(os::ThreadType thr_type);
 139 
 140   // Real-time clock functions
 141   static void clock_init(void);
 142 




 143   // Stack repair handling
 144 
 145   // none present
 146 
 147   // BsdThreads work-around for 6292965
 148   static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
 149 
 150 private:
 151   typedef int (*sched_getcpu_func_t)(void);
 152   typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
 153   typedef int (*numa_max_node_func_t)(void);
 154   typedef int (*numa_available_func_t)(void);
 155   typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
 156   typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
 157 
 158   static sched_getcpu_func_t _sched_getcpu;
 159   static numa_node_to_cpus_func_t _numa_node_to_cpus;
 160   static numa_max_node_func_t _numa_max_node;
 161   static numa_available_func_t _numa_available;
 162   static numa_tonode_memory_func_t _numa_tonode_memory;
 163   static numa_interleave_memory_func_t _numa_interleave_memory;
 164   static unsigned long* _numa_all_nodes;
 165 
 166   static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
 167   static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
 168   static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
 169   static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
 170   static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
 171   static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
 172   static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
 173 public:
 174   static int sched_getcpu()  { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
 175   static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
 176     return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
 177   }
 178   static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
 179   static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
 180   static int numa_tonode_memory(void *start, size_t size, int node) {
 181     return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
 182   }
 183   static void numa_interleave_memory(void *start, size_t size) {
 184     if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
 185       _numa_interleave_memory(start, size, _numa_all_nodes);
 186     }
 187   }
 188   static int get_node_by_cpu(int cpu_id);
 189 };
 190 
 191 
 192 class PlatformEvent : public CHeapObj<mtInternal> {
 193   private:
 194     double CachePad [4] ;   // increase odds that _mutex is sole occupant of cache line
 195     volatile int _Event ;
 196     volatile int _nParked ;
 197     pthread_mutex_t _mutex  [1] ;
 198     pthread_cond_t  _cond   [1] ;
 199     double PostPad  [2] ;
 200     Thread * _Assoc ;
 201 
 202   public:       // TODO-FIXME: make dtor private
 203     ~PlatformEvent() { guarantee (0, "invariant") ; }
 204 
 205   public:
 206     PlatformEvent() {
 207       int status;
 208       status = pthread_cond_init (_cond, NULL);
 209       assert_status(status == 0, status, "cond_init");
 210       status = pthread_mutex_init (_mutex, NULL);
 211       assert_status(status == 0, status, "mutex_init");
 212       _Event   = 0 ;
 213       _nParked = 0 ;
 214       _Assoc   = NULL ;
 215     }
 216 
 217     // Use caution with reset() and fired() -- they may require MEMBARs
 218     void reset() { _Event = 0 ; }
 219     int  fired() { return _Event; }
 220     void park () ;
 221     void unpark () ;
 222     int  TryPark () ;
 223     int  park (jlong millis) ;
 224     void SetAssociation (Thread * a) { _Assoc = a ; }
 225 };
 226 
 227 class PlatformParker : public CHeapObj<mtInternal> {
 228   protected:
 229     pthread_mutex_t _mutex [1] ;
 230     pthread_cond_t  _cond  [1] ;
 231 
 232   public:       // TODO-FIXME: make dtor private
 233     ~PlatformParker() { guarantee (0, "invariant") ; }
 234 
 235   public:
 236     PlatformParker() {
 237       int status;
 238       status = pthread_cond_init (_cond, NULL);
 239       assert_status(status == 0, status, "cond_init");
 240       status = pthread_mutex_init (_mutex, NULL);
 241       assert_status(status == 0, status, "mutex_init");
 242     }
 243 };
 244 
 245 #endif // OS_BSD_VM_OS_BSD_HPP
--- EOF ---