Mercurial > hg > graal-compiler
view src/share/vm/runtime/os.hpp @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Wed, 19 Jan 2011 09:35:17 -0500 |
parents | 828eafbd85cc |
children | b92c45f2bc75 f7de3327c683 |
line wrap: on
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/* * Copyright (c) 1997, 2010, 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" #endif #ifdef TARGET_OS_FAMILY_solaris # include "jvm_solaris.h" #endif #ifdef TARGET_OS_FAMILY_windows # include "jvm_windows.h" #endif // 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; 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 }; // Typedef for structured exception handling support typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); class os: AllStatic { 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 } public: static void init(void); // Called before command line parsing static jint init_2(void); // Called after command line parsing static void init_3(void); // Called at the end of vm init // File names are case-insensitive on windows only // Override me as needed static int file_name_strcmp(const char* s1, const char* s2); static bool getenv(const char* name, char* buffer, int len); 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() { assert(_processor_count > 0, "invalid processor count"); return _processor_count > 1; } static julong available_memory(); static julong physical_memory(); static julong allocatable_physical_memory(julong size); 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); // 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(); // Return the page size to use for a region of memory. The min_pages argument // is a hint intended to limit fragmentation; it says the returned page size // should be <= region_max_size / min_pages. Because min_pages is a hint, // this routine may return a size larger than region_max_size / min_pages. // // The current implementation ignores min_pages if a larger page size is an // exact multiple of both region_min_size and region_max_size. This allows // larger pages to be used when doing so would not cause fragmentation; in // particular, a single page can be used when region_min_size == // region_max_size == a supported page size. static size_t page_size_for_region(size_t region_min_size, size_t region_max_size, uint min_pages); // Method 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 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* 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 = false); static bool commit_memory(char* addr, size_t size, size_t alignment_hint, bool executable = false); static bool uncommit_memory(char* addr, size_t bytes); static bool release_memory(char* addr, size_t bytes); 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 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); 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, char* addr = NULL, bool executable = false); static bool release_memory_special(char* addr, size_t bytes); static bool 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(); 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); static int naked_sleep(); 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 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); // Set file to send error reports. static void set_error_file(const char *logfile); // 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 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, int buflen); // Builds a platform-specific full library path given a ld path and lib name static void 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 returned as offset. // If function name is not found, buf[0] is set to '\0' and offset is // set to -1. 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 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. 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); // 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_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); // 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); // General allocation (must be MT-safe) static void* malloc (size_t size); static void* realloc (void *memblock, size_t size); static void free (void *memblock); static bool check_heap(bool force = false); // verify C heap integrity static char* strdup(const char *); // Like strdup #ifndef PRODUCT static int num_mallocs; // # of calls to malloc/realloc static size_t alloc_bytes; // # of bytes allocated static int num_frees; // # of calls to free #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, int nBytes, int flags); static int send(int fd, char *buf, int nBytes, int flags); static int raw_send(int fd, char *buf, int nBytes, int flags); static int timeout(int fd, long timeout); static int listen(int fd, int count); static int connect(int fd, struct sockaddr *him, int len); static int bind(int fd, struct sockaddr *him, int len); static int accept(int fd, struct sockaddr *him, int *len); static int recvfrom(int fd, char *buf, int nbytes, int flags, struct sockaddr *from, int *fromlen); static int get_sock_name(int fd, struct sockaddr *him, int *len); static int sendto(int fd, char *buf, int len, int flags, struct sockaddr *to, int tolen); static int socket_available(int fd, jint *pbytes); static int get_sock_opt(int fd, int level, int optname, char *optval, int* optlen); static int set_sock_opt(int fd, int level, int optname, const char *optval, int optlen); static int get_host_name(char* name, int namelen); static struct hostent* get_host_by_name(char* name); // Printing 64 bit integers static const char* jlong_format_specifier(); static const char* julong_format_specifier(); // 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); // 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); // Platform dependent stuff #ifdef TARGET_OS_FAMILY_linux # include "os_linux.hpp" #endif #ifdef TARGET_OS_FAMILY_solaris # include "os_solaris.hpp" #endif #ifdef TARGET_OS_FAMILY_windows # include "os_windows.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 // 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[MaxPriority + 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(); 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 () ; extern "C" int SafeFetch32 (int * adr, int errValue) ; extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ; #endif // SHARE_VM_RUNTIME_OS_HPP