jdk8-mips64-public/hotspot: src/share/vm/runtime/os.hpp@5788dbd1f2d6 (annotated)

src/share/vm/runtime/os.hpp@5788dbd1f2d6 (annotated)

src/share/vm/runtime/os.hpp

Fri, 16 Jan 2015 10:29:12 +0100

author: ehelin
date: Fri, 16 Jan 2015 10:29:12 +0100
changeset 7780: 5788dbd1f2d6
parent 7778: c2ce24504334
child 7994: 04ff2f6cd0eb
child 8661: 27ae9bbef86a
permissions: -rw-r--r--

8066875: VirtualSpace does not use large pages
Reviewed-by: stefank, tschatzl, anoll, thartmann

 /*
  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. 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 SHARE_VM_RUNTIME_OS_HPP
 #define SHARE_VM_RUNTIME_OS_HPP
 #include "jvmtifiles/jvmti.h"
 #include "runtime/atomic.hpp"
 #include "runtime/extendedPC.hpp"
 #include "runtime/handles.hpp"
 #include "utilities/top.hpp"
 #ifdef TARGET_OS_FAMILY_linux
 # include "jvm_linux.h"
 # include <setjmp.h>
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "jvm_solaris.h"
 # include <setjmp.h>
 #endif
 #ifdef TARGET_OS_FAMILY_windows
 # include "jvm_windows.h"
 #endif
 #ifdef TARGET_OS_FAMILY_aix
 # include "jvm_aix.h"
 # include <setjmp.h>
 #endif
 #ifdef TARGET_OS_FAMILY_bsd
 # include "jvm_bsd.h"
 # include <setjmp.h>
 # ifdef __APPLE__
 #  include <mach/mach_time.h>
 # endif
 #endif
 class AgentLibrary;
 // os defines the interface to operating system; this includes traditional
 // OS services (time, I/O) as well as other functionality with system-
 // dependent code.
 typedef void (*dll_func)(...);
 class Thread;
 class JavaThread;
 class Event;
 class DLL;
 class FileHandle;
 class NativeCallStack;
 template<class E> class GrowableArray;
 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
 // Platform-independent error return values from OS functions
 enum OSReturn {
   OS_OK         =  0,        // Operation was successful
   OS_ERR        = -1,        // Operation failed
   OS_INTRPT     = -2,        // Operation was interrupted
   OS_TIMEOUT    = -3,        // Operation timed out
   OS_NOMEM      = -5,        // Operation failed for lack of memory
   OS_NORESOURCE = -6         // Operation failed for lack of nonmemory resource
 };
 enum ThreadPriority {        // JLS 20.20.1-3
   NoPriority       = -1,     // Initial non-priority value
   MinPriority      =  1,     // Minimum priority
   NormPriority     =  5,     // Normal (non-daemon) priority
   NearMaxPriority  =  9,     // High priority, used for VMThread
   MaxPriority      = 10,     // Highest priority, used for WatcherThread
                              // ensures that VMThread doesn't starve profiler
   CriticalPriority = 11      // Critical thread priority
 };
 // Executable parameter flag for os::commit_memory() and
 // os::commit_memory_or_exit().
 const bool ExecMem = true;
 // Typedef for structured exception handling support
 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
 class MallocTracker;
 class os: AllStatic {
   friend class VMStructs;
   friend class MallocTracker;
  public:
   enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
  private:
   static OSThread*          _starting_thread;
   static address            _polling_page;
   static volatile int32_t * _mem_serialize_page;
   static uintptr_t          _serialize_page_mask;
  public:
   static size_t             _page_sizes[page_sizes_max];
  private:
   static void init_page_sizes(size_t default_page_size) {
     _page_sizes[0] = default_page_size;
     _page_sizes[1] = 0; // sentinel
   }
   static char*  pd_reserve_memory(size_t bytes, char* addr = 0,
                                size_t alignment_hint = 0);
   static char*  pd_attempt_reserve_memory_at(size_t bytes, char* addr);
   static void   pd_split_reserved_memory(char *base, size_t size,
                                       size_t split, bool realloc);
   static bool   pd_commit_memory(char* addr, size_t bytes, bool executable);
   static bool   pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
                                  bool executable);
   // Same as pd_commit_memory() that either succeeds or calls
   // vm_exit_out_of_memory() with the specified mesg.
   static void   pd_commit_memory_or_exit(char* addr, size_t bytes,
                                          bool executable, const char* mesg);
   static void   pd_commit_memory_or_exit(char* addr, size_t size,
                                          size_t alignment_hint,
                                          bool executable, const char* mesg);
   static bool   pd_uncommit_memory(char* addr, size_t bytes);
   static bool   pd_release_memory(char* addr, size_t bytes);
   static char*  pd_map_memory(int fd, const char* file_name, size_t file_offset,
                            char *addr, size_t bytes, bool read_only = false,
                            bool allow_exec = false);
   static char*  pd_remap_memory(int fd, const char* file_name, size_t file_offset,
                              char *addr, size_t bytes, bool read_only,
                              bool allow_exec);
   static bool   pd_unmap_memory(char *addr, size_t bytes);
   static void   pd_free_memory(char *addr, size_t bytes, size_t alignment_hint);
   static void   pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint);
   static size_t page_size_for_region(size_t region_size, size_t min_pages, bool must_be_aligned);
  public:
   static void init(void);                      // Called before command line parsing
   static void init_before_ergo(void);          // Called after command line parsing
                                                // before VM ergonomics processing.
   static jint init_2(void);                    // Called after command line parsing
                                                // and VM ergonomics processing
   static void init_globals(void) {             // Called from init_globals() in init.cpp
     init_globals_ext();
   }
   // File names are case-insensitive on windows only
   // Override me as needed
   static int    file_name_strcmp(const char* s1, const char* s2);
   // get/unset environment variable
   static bool getenv(const char* name, char* buffer, int len);
   static bool unsetenv(const char* name);
   static bool have_special_privileges();
   static jlong  javaTimeMillis();
   static jlong  javaTimeNanos();
   static void   javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
   static void   run_periodic_checks();
   // Returns the elapsed time in seconds since the vm started.
   static double elapsedTime();
   // Returns real time in seconds since an arbitrary point
   // in the past.
   static bool getTimesSecs(double* process_real_time,
                            double* process_user_time,
                            double* process_system_time);
   // Interface to the performance counter
   static jlong elapsed_counter();
   static jlong elapsed_frequency();
   // The "virtual time" of a thread is the amount of time a thread has
   // actually run.  The first function indicates whether the OS supports
   // this functionality for the current thread, and if so:
   //   * the second enables vtime tracking (if that is required).
   //   * the third tells whether vtime is enabled.
   //   * the fourth returns the elapsed virtual time for the current
   //     thread.
   static bool supports_vtime();
   static bool enable_vtime();
   static bool vtime_enabled();
   static double elapsedVTime();
   // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
   // It is MT safe, but not async-safe, as reading time zone
   // information may require a lock on some platforms.
   static char*      local_time_string(char *buf, size_t buflen);
   static struct tm* localtime_pd     (const time_t* clock, struct tm*  res);
   // Fill in buffer with current local time as an ISO-8601 string.
   // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
   // Returns buffer, or NULL if it failed.
   static char* iso8601_time(char* buffer, size_t buffer_length);
   // Interface for detecting multiprocessor system
   static inline bool is_MP() {
     // During bootstrap if _processor_count is not yet initialized
     // we claim to be MP as that is safest. If any platform has a
     // stub generator that might be triggered in this phase and for
     // which being declared MP when in fact not, is a problem - then
     // the bootstrap routine for the stub generator needs to check
     // the processor count directly and leave the bootstrap routine
     // in place until called after initialization has ocurred.
     return (_processor_count != 1) || AssumeMP;
   }
   static julong available_memory();
   static julong physical_memory();
   static bool has_allocatable_memory_limit(julong* limit);
   static bool is_server_class_machine();
   // number of CPUs
   static int processor_count() {
     return _processor_count;
   }
   static void set_processor_count(int count) { _processor_count = count; }
   // Returns the number of CPUs this process is currently allowed to run on.
   // Note that on some OSes this can change dynamically.
   static int active_processor_count();
   // Bind processes to processors.
   //     This is a two step procedure:
   //     first you generate a distribution of processes to processors,
   //     then you bind processes according to that distribution.
   // Compute a distribution for number of processes to processors.
   //    Stores the processor id's into the distribution array argument.
   //    Returns true if it worked, false if it didn't.
   static bool distribute_processes(uint length, uint* distribution);
   // Binds the current process to a processor.
   //    Returns true if it worked, false if it didn't.
   static bool bind_to_processor(uint processor_id);
   // Give a name to the current thread.
   static void set_native_thread_name(const char *name);
   // Interface for stack banging (predetect possible stack overflow for
   // exception processing)  There are guard pages, and above that shadow
   // pages for stack overflow checking.
   static bool uses_stack_guard_pages();
   static bool allocate_stack_guard_pages();
   static void bang_stack_shadow_pages();
   static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
   // OS interface to Virtual Memory
   // Return the default page size.
   static int    vm_page_size();
   // Returns the page size to use for a region of memory.
   // region_size / min_pages will always be greater than or equal to the
   // returned value. The returned value will divide region_size.
   static size_t page_size_for_region_aligned(size_t region_size, size_t min_pages);
   // Returns the page size to use for a region of memory.
   // region_size / min_pages will always be greater than or equal to the
   // returned value. The returned value might not divide region_size.
   static size_t page_size_for_region_unaligned(size_t region_size, size_t min_pages);
   // Return the largest page size that can be used
   static size_t max_page_size() {
     // The _page_sizes array is sorted in descending order.
     return _page_sizes[0];
   }
   // Methods for tracing page sizes returned by the above method; enabled by
   // TracePageSizes.  The region_{min,max}_size parameters should be the values
   // passed to page_size_for_region() and page_size should be the result of that
   // call.  The (optional) base and size parameters should come from the
   // ReservedSpace base() and size() methods.
   static void trace_page_sizes(const char* str, const size_t* page_sizes,
                                int count) PRODUCT_RETURN;
   static void trace_page_sizes(const char* str, const size_t region_min_size,
                                const size_t region_max_size,
                                const size_t page_size,
                                const char* base = NULL,
                                const size_t size = 0) PRODUCT_RETURN;
   static int    vm_allocation_granularity();
   static char*  reserve_memory(size_t bytes, char* addr = 0,
                                size_t alignment_hint = 0);
   static char*  reserve_memory(size_t bytes, char* addr,
                                size_t alignment_hint, MEMFLAGS flags);
   static char*  reserve_memory_aligned(size_t size, size_t alignment);
   static char*  attempt_reserve_memory_at(size_t bytes, char* addr);
   static void   split_reserved_memory(char *base, size_t size,
                                       size_t split, bool realloc);
   static bool   commit_memory(char* addr, size_t bytes, bool executable);
   static bool   commit_memory(char* addr, size_t size, size_t alignment_hint,
                               bool executable);
   // Same as commit_memory() that either succeeds or calls
   // vm_exit_out_of_memory() with the specified mesg.
   static void   commit_memory_or_exit(char* addr, size_t bytes,
                                       bool executable, const char* mesg);
   static void   commit_memory_or_exit(char* addr, size_t size,
                                       size_t alignment_hint,
                                       bool executable, const char* mesg);
   static bool   uncommit_memory(char* addr, size_t bytes);
   static bool   release_memory(char* addr, size_t bytes);
   // Touch memory pages that cover the memory range from start to end (exclusive)
   // to make the OS back the memory range with actual memory.
   // Current implementation may not touch the last page if unaligned addresses
   // are passed.
   static void   pretouch_memory(char* start, char* end);
   enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
   static bool   protect_memory(char* addr, size_t bytes, ProtType prot,
                                bool is_committed = true);
   static bool   guard_memory(char* addr, size_t bytes);
   static bool   unguard_memory(char* addr, size_t bytes);
   static bool   create_stack_guard_pages(char* addr, size_t bytes);
   static bool   pd_create_stack_guard_pages(char* addr, size_t bytes);
   static bool   remove_stack_guard_pages(char* addr, size_t bytes);
   static char*  map_memory(int fd, const char* file_name, size_t file_offset,
                            char *addr, size_t bytes, bool read_only = false,
                            bool allow_exec = false);
   static char*  remap_memory(int fd, const char* file_name, size_t file_offset,
                              char *addr, size_t bytes, bool read_only,
                              bool allow_exec);
   static bool   unmap_memory(char *addr, size_t bytes);
   static void   free_memory(char *addr, size_t bytes, size_t alignment_hint);
   static void   realign_memory(char *addr, size_t bytes, size_t alignment_hint);
   // NUMA-specific interface
   static bool   numa_has_static_binding();
   static bool   numa_has_group_homing();
   static void   numa_make_local(char *addr, size_t bytes, int lgrp_hint);
   static void   numa_make_global(char *addr, size_t bytes);
   static size_t numa_get_groups_num();
   static size_t numa_get_leaf_groups(int *ids, size_t size);
   static bool   numa_topology_changed();
   static int    numa_get_group_id();
   // Page manipulation
   struct page_info {
     size_t size;
     int lgrp_id;
   };
   static bool   get_page_info(char *start, page_info* info);
   static char*  scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
   static char*  non_memory_address_word();
   // reserve, commit and pin the entire memory region
   static char*  reserve_memory_special(size_t size, size_t alignment,
                                        char* addr, bool executable);
   static bool   release_memory_special(char* addr, size_t bytes);
   static void   large_page_init();
   static size_t large_page_size();
   static bool   can_commit_large_page_memory();
   static bool   can_execute_large_page_memory();
   // OS interface to polling page
   static address get_polling_page()             { return _polling_page; }
   static void    set_polling_page(address page) { _polling_page = page; }
   static bool    is_poll_address(address addr)  { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
   static void    make_polling_page_unreadable();
   static void    make_polling_page_readable();
   // Routines used to serialize the thread state without using membars
   static void    serialize_thread_states();
   // Since we write to the serialize page from every thread, we
   // want stores to be on unique cache lines whenever possible
   // in order to minimize CPU cross talk.  We pre-compute the
   // amount to shift the thread* to make this offset unique to
   // each thread.
   static int     get_serialize_page_shift_count() {
     return SerializePageShiftCount;
   }
   static void     set_serialize_page_mask(uintptr_t mask) {
     _serialize_page_mask = mask;
   }
   static unsigned int  get_serialize_page_mask() {
     return _serialize_page_mask;
   }
   static void    set_memory_serialize_page(address page);
   static address get_memory_serialize_page() {
     return (address)_mem_serialize_page;
   }
   static inline void write_memory_serialize_page(JavaThread *thread) {
     uintptr_t page_offset = ((uintptr_t)thread >>
                             get_serialize_page_shift_count()) &
                             get_serialize_page_mask();
     *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
   }
   static bool    is_memory_serialize_page(JavaThread *thread, address addr) {
     if (UseMembar) return false;
     // Previously this function calculated the exact address of this
     // thread's serialize page, and checked if the faulting address
     // was equal.  However, some platforms mask off faulting addresses
     // to the page size, so now we just check that the address is
     // within the page.  This makes the thread argument unnecessary,
     // but we retain the NULL check to preserve existing behaviour.
     if (thread == NULL) return false;
     address page = (address) _mem_serialize_page;
     return addr >= page && addr < (page + os::vm_page_size());
   }
   static void block_on_serialize_page_trap();
   // threads
   enum ThreadType {
     vm_thread,
     cgc_thread,        // Concurrent GC thread
     pgc_thread,        // Parallel GC thread
     java_thread,
     compiler_thread,
     watcher_thread,
     os_thread
   };
   static bool create_thread(Thread* thread,
                             ThreadType thr_type,
                             size_t stack_size = 0);
   static bool create_main_thread(JavaThread* thread);
   static bool create_attached_thread(JavaThread* thread);
   static void pd_start_thread(Thread* thread);
   static void start_thread(Thread* thread);
   static void initialize_thread(Thread* thr);
   static void free_thread(OSThread* osthread);
   // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
   static intx current_thread_id();
   static int current_process_id();
   static int sleep(Thread* thread, jlong ms, bool interruptable);
   // Short standalone OS sleep suitable for slow path spin loop.
   // Ignores Thread.interrupt() (so keep it short).
   // ms = 0, will sleep for the least amount of time allowed by the OS.
   static void naked_short_sleep(jlong ms);
   static void infinite_sleep(); // never returns, use with CAUTION
   static void yield();        // Yields to all threads with same priority
   enum YieldResult {
     YIELD_SWITCHED = 1,         // caller descheduled, other ready threads exist & ran
     YIELD_NONEREADY = 0,        // No other runnable/ready threads.
                                 // platform-specific yield return immediately
     YIELD_UNKNOWN = -1          // Unknown: platform doesn't support _SWITCHED or _NONEREADY
     // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
     // yield that can be used in lieu of blocking.
   } ;
   static YieldResult NakedYield () ;
   static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
   static void loop_breaker(int attempts);  // called from within tight loops to possibly influence time-sharing
   static OSReturn set_priority(Thread* thread, ThreadPriority priority);
   static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
   static void interrupt(Thread* thread);
   static bool is_interrupted(Thread* thread, bool clear_interrupted);
   static int pd_self_suspend_thread(Thread* thread);
   static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
   static frame      fetch_frame_from_context(void* ucVoid);
   static ExtendedPC get_thread_pc(Thread *thread);
   static void breakpoint();
   static address current_stack_pointer();
   static address current_stack_base();
   static size_t current_stack_size();
   static void verify_stack_alignment() PRODUCT_RETURN;
   static int message_box(const char* title, const char* message);
   static char* do_you_want_to_debug(const char* message);
   // run cmd in a separate process and return its exit code; or -1 on failures
   static int fork_and_exec(char *cmd);
   // os::exit() is merged with vm_exit()
   // static void exit(int num);
   // Terminate the VM, but don't exit the process
   static void shutdown();
   // Terminate with an error.  Default is to generate a core file on platforms
   // that support such things.  This calls shutdown() and then aborts.
   static void abort(bool dump_core = true);
   // Die immediately, no exit hook, no abort hook, no cleanup.
   static void die();
   // File i/o operations
   static const int default_file_open_flags();
   static int open(const char *path, int oflag, int mode);
   static FILE* open(int fd, const char* mode);
   static int close(int fd);
   static jlong lseek(int fd, jlong offset, int whence);
   static char* native_path(char *path);
   static int ftruncate(int fd, jlong length);
   static int fsync(int fd);
   static int available(int fd, jlong *bytes);
   //File i/o operations
   static size_t read(int fd, void *buf, unsigned int nBytes);
   static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
   static size_t write(int fd, const void *buf, unsigned int nBytes);
   // Reading directories.
   static DIR*           opendir(const char* dirname);
   static int            readdir_buf_size(const char *path);
   static struct dirent* readdir(DIR* dirp, dirent* dbuf);
   static int            closedir(DIR* dirp);
   // Dynamic library extension
   static const char*    dll_file_extension();
   static const char*    get_temp_directory();
   static const char*    get_current_directory(char *buf, size_t buflen);
   // Builds a platform-specific full library path given a ld path and lib name
   // Returns true if buffer contains full path to existing file, false otherwise
   static bool           dll_build_name(char* buffer, size_t size,
                                        const char* pathname, const char* fname);
   // Symbol lookup, find nearest function name; basically it implements
   // dladdr() for all platforms. Name of the nearest function is copied
   // to buf. Distance from its base address is optionally returned as offset.
   // If function name is not found, buf[0] is set to '\0' and offset is
   // set to -1 (if offset is non-NULL).
   static bool dll_address_to_function_name(address addr, char* buf,
                                            int buflen, int* offset);
   // Locate DLL/DSO. On success, full path of the library is copied to
   // buf, and offset is optionally set to be the distance between addr
   // and the library's base address. On failure, buf[0] is set to '\0'
   // and offset is set to -1 (if offset is non-NULL).
   static bool dll_address_to_library_name(address addr, char* buf,
                                           int buflen, int* offset);
   // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
   static bool address_is_in_vm(address addr);
   // Loads .dll/.so and
   // in case of error it checks if .dll/.so was built for the
   // same architecture as Hotspot is running on
   static void* dll_load(const char *name, char *ebuf, int ebuflen);
   // lookup symbol in a shared library
   static void* dll_lookup(void* handle, const char* name);
   // Unload library
   static void  dll_unload(void *lib);
   // Return the handle of this process
   static void* get_default_process_handle();
   // Check for static linked agent library
   static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[],
                                  size_t syms_len);
   // Find agent entry point
   static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib,
                                    const char *syms[], size_t syms_len);
   // Print out system information; they are called by fatal error handler.
   // Output format may be different on different platforms.
   static void print_os_info(outputStream* st);
   static void print_os_info_brief(outputStream* st);
   static void print_cpu_info(outputStream* st);
   static void pd_print_cpu_info(outputStream* st);
   static void print_memory_info(outputStream* st);
   static void print_dll_info(outputStream* st);
   static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
   static void print_context(outputStream* st, void* context);
   static void print_register_info(outputStream* st, void* context);
   static void print_siginfo(outputStream* st, void* siginfo);
   static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
   static void print_date_and_time(outputStream* st);
   static void print_location(outputStream* st, intptr_t x, bool verbose = false);
   static size_t lasterror(char *buf, size_t len);
   static int get_last_error();
   // Determines whether the calling process is being debugged by a user-mode debugger.
   static bool is_debugger_attached();
   // wait for a key press if PauseAtExit is set
   static void wait_for_keypress_at_exit(void);
   // The following two functions are used by fatal error handler to trace
   // native (C) frames. They are not part of frame.hpp/frame.cpp because
   // frame.hpp/cpp assume thread is JavaThread, and also because different
   // OS/compiler may have different convention or provide different API to
   // walk C frames.
   //
   // We don't attempt to become a debugger, so we only follow frames if that
   // does not require a lookup in the unwind table, which is part of the binary
   // file but may be unsafe to read after a fatal error. So on x86, we can
   // only walk stack if %ebp is used as frame pointer; on ia64, it's not
   // possible to walk C stack without having the unwind table.
   static bool is_first_C_frame(frame *fr);
   static frame get_sender_for_C_frame(frame *fr);
   // return current frame. pc() and sp() are set to NULL on failure.
   static frame      current_frame();
   static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
   // returns a string to describe the exception/signal;
   // returns NULL if exception_code is not an OS exception/signal.
   static const char* exception_name(int exception_code, char* buf, size_t buflen);
   // Returns native Java library, loads if necessary
   static void*    native_java_library();
   // Fills in path to jvm.dll/libjvm.so (used by the Disassembler)
   static void     jvm_path(char *buf, jint buflen);
   // Returns true if we are running in a headless jre.
   static bool     is_headless_jre();
   // JNI names
   static void     print_jni_name_prefix_on(outputStream* st, int args_size);
   static void     print_jni_name_suffix_on(outputStream* st, int args_size);
   // File conventions
   static const char* file_separator();
   static const char* line_separator();
   static const char* path_separator();
   // Init os specific system properties values
   static void init_system_properties_values();
   // IO operations, non-JVM_ version.
   static int stat(const char* path, struct stat* sbuf);
   static bool dir_is_empty(const char* path);
   // IO operations on binary files
   static int create_binary_file(const char* path, bool rewrite_existing);
   static jlong current_file_offset(int fd);
   static jlong seek_to_file_offset(int fd, jlong offset);
   // Thread Local Storage
   static int   allocate_thread_local_storage();
   static void  thread_local_storage_at_put(int index, void* value);
   static void* thread_local_storage_at(int index);
   static void  free_thread_local_storage(int index);
   // Retrieve native stack frames.
   // Parameter:
   //   stack:  an array to storage stack pointers.
   //   frames: size of above array.
   //   toSkip: number of stack frames to skip at the beginning.
   // Return: number of stack frames captured.
   static int get_native_stack(address* stack, int size, int toSkip = 0);
   // General allocation (must be MT-safe)
   static void* malloc  (size_t size, MEMFLAGS flags, const NativeCallStack& stack);
   static void* malloc  (size_t size, MEMFLAGS flags);
   static void* realloc (void *memblock, size_t size, MEMFLAGS flag, const NativeCallStack& stack);
   static void* realloc (void *memblock, size_t size, MEMFLAGS flag);
   static void  free    (void *memblock, MEMFLAGS flags = mtNone);
   static bool  check_heap(bool force = false);      // verify C heap integrity
   static char* strdup(const char *, MEMFLAGS flags = mtInternal);  // Like strdup
 #ifndef PRODUCT
   static julong num_mallocs;         // # of calls to malloc/realloc
   static julong alloc_bytes;         // # of bytes allocated
   static julong num_frees;           // # of calls to free
   static julong free_bytes;          // # of bytes freed
 #endif
   // SocketInterface (ex HPI SocketInterface )
   static int socket(int domain, int type, int protocol);
   static int socket_close(int fd);
   static int socket_shutdown(int fd, int howto);
   static int recv(int fd, char* buf, size_t nBytes, uint flags);
   static int send(int fd, char* buf, size_t nBytes, uint flags);
   static int raw_send(int fd, char* buf, size_t nBytes, uint flags);
   static int timeout(int fd, long timeout);
   static int listen(int fd, int count);
   static int connect(int fd, struct sockaddr* him, socklen_t len);
   static int bind(int fd, struct sockaddr* him, socklen_t len);
   static int accept(int fd, struct sockaddr* him, socklen_t* len);
   static int recvfrom(int fd, char* buf, size_t nbytes, uint flags,
                       struct sockaddr* from, socklen_t* fromlen);
   static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len);
   static int sendto(int fd, char* buf, size_t len, uint flags,
                     struct sockaddr* to, socklen_t tolen);
   static int socket_available(int fd, jint* pbytes);
   static int get_sock_opt(int fd, int level, int optname,
                           char* optval, socklen_t* optlen);
   static int set_sock_opt(int fd, int level, int optname,
                           const char* optval, socklen_t optlen);
   static int get_host_name(char* name, int namelen);
   static struct hostent* get_host_by_name(char* name);
   // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
   static void  signal_init();
   static void  signal_init_pd();
   static void  signal_notify(int signal_number);
   static void* signal(int signal_number, void* handler);
   static void  signal_raise(int signal_number);
   static int   signal_wait();
   static int   signal_lookup();
   static void* user_handler();
   static void  terminate_signal_thread();
   static int   sigexitnum_pd();
   // random number generation
   static long random();                    // return 32bit pseudorandom number
   static void init_random(long initval);   // initialize random sequence
   // Structured OS Exception support
   static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
   // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits
   static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize);
   // Get the default path to the core file
   // Returns the length of the string
   static int get_core_path(char* buffer, size_t bufferSize);
   // JVMTI & JVM monitoring and management support
   // The thread_cpu_time() and current_thread_cpu_time() are only
   // supported if is_thread_cpu_time_supported() returns true.
   // They are not supported on Solaris T1.
   // Thread CPU Time - return the fast estimate on a platform
   // On Solaris - call gethrvtime (fast) - user time only
   // On Linux   - fast clock_gettime where available - user+sys
   //            - otherwise: very slow /proc fs - user+sys
   // On Windows - GetThreadTimes - user+sys
   static jlong current_thread_cpu_time();
   static jlong thread_cpu_time(Thread* t);
   // Thread CPU Time with user_sys_cpu_time parameter.
   //
   // If user_sys_cpu_time is true, user+sys time is returned.
   // Otherwise, only user time is returned
   static jlong current_thread_cpu_time(bool user_sys_cpu_time);
   static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
   // Return a bunch of info about the timers.
   // Note that the returned info for these two functions may be different
   // on some platforms
   static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
   static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
   static bool is_thread_cpu_time_supported();
   // System loadavg support.  Returns -1 if load average cannot be obtained.
   static int loadavg(double loadavg[], int nelem);
   // Hook for os specific jvm options that we don't want to abort on seeing
   static bool obsolete_option(const JavaVMOption *option);
   // Extensions
 #include "runtime/os_ext.hpp"
  public:
   class CrashProtectionCallback : public StackObj {
   public:
     virtual void call() = 0;
   };
   // Platform dependent stuff
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.hpp"
 # include "os_posix.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "os_solaris.hpp"
 # include "os_posix.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_windows
 # include "os_windows.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_aix
 # include "os_aix.hpp"
 # include "os_posix.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_bsd
 # include "os_posix.hpp"
 # include "os_bsd.hpp"
 #endif
 #ifdef TARGET_OS_ARCH_linux_x86
 # include "os_linux_x86.hpp"
 #endif
 #ifdef TARGET_OS_ARCH_linux_sparc
 # include "os_linux_sparc.hpp"
 #endif
 #ifdef TARGET_OS_ARCH_linux_zero
 # include "os_linux_zero.hpp"
 #endif
 #ifdef TARGET_OS_ARCH_solaris_x86
 # include "os_solaris_x86.hpp"
 #endif
 #ifdef TARGET_OS_ARCH_solaris_sparc
 # include "os_solaris_sparc.hpp"
 #endif
 #ifdef TARGET_OS_ARCH_windows_x86
 # include "os_windows_x86.hpp"
 #endif
 #ifdef TARGET_OS_ARCH_linux_arm
 # include "os_linux_arm.hpp"
 #endif
 #ifdef TARGET_OS_ARCH_linux_ppc
 # include "os_linux_ppc.hpp"
 #endif
 #ifdef TARGET_OS_ARCH_aix_ppc
 # include "os_aix_ppc.hpp"
 #endif
 #ifdef TARGET_OS_ARCH_bsd_x86
 # include "os_bsd_x86.hpp"
 #endif
 #ifdef TARGET_OS_ARCH_bsd_zero
 # include "os_bsd_zero.hpp"
 #endif
  public:
 #ifndef PLATFORM_PRINT_NATIVE_STACK
   // No platform-specific code for printing the native stack.
   static bool platform_print_native_stack(outputStream* st, void* context,
                                           char *buf, int buf_size) {
     return false;
   }
 #endif
   // debugging support (mostly used by debug.cpp but also fatal error handler)
   static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address
   static bool dont_yield();                     // when true, JVM_Yield() is nop
   static void print_statistics();
   // Thread priority helpers (implemented in OS-specific part)
   static OSReturn set_native_priority(Thread* thread, int native_prio);
   static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
   static int java_to_os_priority[CriticalPriority + 1];
   // Hint to the underlying OS that a task switch would not be good.
   // Void return because it's a hint and can fail.
   static void hint_no_preempt();
   // Used at creation if requested by the diagnostic flag PauseAtStartup.
   // Causes the VM to wait until an external stimulus has been applied
   // (for Unix, that stimulus is a signal, for Windows, an external
   // ResumeThread call)
   static void pause();
   // Builds a platform dependent Agent_OnLoad_<libname> function name
   // which is used to find statically linked in agents.
   static char*  build_agent_function_name(const char *sym, const char *cname,
                                           bool is_absolute_path);
   class SuspendedThreadTaskContext {
   public:
     SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {}
     Thread* thread() const { return _thread; }
     void* ucontext() const { return _ucontext; }
   private:
     Thread* _thread;
     void* _ucontext;
   };
   class SuspendedThreadTask {
   public:
     SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {}
     virtual ~SuspendedThreadTask() {}
     void run();
     bool is_done() { return _done; }
     virtual void do_task(const SuspendedThreadTaskContext& context) = 0;
   protected:
   private:
     void internal_do_task();
     Thread* _thread;
     bool _done;
   };
 #ifndef TARGET_OS_FAMILY_windows
   // Suspend/resume support
   // Protocol:
   //
   // a thread starts in SR_RUNNING
   //
   // SR_RUNNING can go to
   //   * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it
   // SR_SUSPEND_REQUEST can go to
   //   * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout)
   //   * SR_SUSPENDED if the stopped thread receives the signal and switches state
   // SR_SUSPENDED can go to
   //   * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume
   // SR_WAKEUP_REQUEST can go to
   //   * SR_RUNNING when the stopped thread receives the signal
   //   * SR_WAKEUP_REQUEST on timeout (resend the signal and try again)
   class SuspendResume {
    public:
     enum State {
       SR_RUNNING,
       SR_SUSPEND_REQUEST,
       SR_SUSPENDED,
       SR_WAKEUP_REQUEST
     };
   private:
     volatile State _state;
   private:
     /* try to switch state from state "from" to state "to"
      * returns the state set after the method is complete
      */
     State switch_state(State from, State to);
   public:
     SuspendResume() : _state(SR_RUNNING) { }
     State state() const { return _state; }
     State request_suspend() {
       return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST);
     }
     State cancel_suspend() {
       return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING);
     }
     State suspended() {
       return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED);
     }
     State request_wakeup() {
       return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST);
     }
     State running() {
       return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING);
     }
     bool is_running() const {
       return _state == SR_RUNNING;
     }
     bool is_suspend_request() const {
       return _state == SR_SUSPEND_REQUEST;
     }
     bool is_suspended() const {
       return _state == SR_SUSPENDED;
     }
   };
 #endif
  protected:
   static long _rand_seed;                   // seed for random number generator
   static int _processor_count;              // number of processors
   static char* format_boot_path(const char* format_string,
                                 const char* home,
                                 int home_len,
                                 char fileSep,
                                 char pathSep);
   static bool set_boot_path(char fileSep, char pathSep);
   static char** split_path(const char* path, int* n);
 };
 // Note that "PAUSE" is almost always used with synchronization
 // so arguably we should provide Atomic::SpinPause() instead
 // of the global SpinPause() with C linkage.
 // It'd also be eligible for inlining on many platforms.
 extern "C" int SpinPause();
 #endif // SHARE_VM_RUNTIME_OS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/os.hpp@5788dbd1f2d6 (annotated)

src/share/vm/runtime/os.hpp