diff -r 000000000000 -r a61af66fc99e src/share/vm/runtime/os.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/runtime/os.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,596 @@ +/* + * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +// 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; + +// %%%%% 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 { + private: + enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) + + static OSThread* _starting_thread; + static address _polling_page; + static volatile int32_t * _mem_serialize_page; + static uintptr_t _serialize_page_mask; + static volatile jlong _global_time; + static volatile int _global_time_lock; + static bool _use_global_time; + static size_t _page_sizes[page_sizes_max]; + + 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 + + // 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 timeofday(); + static void enable_global_time() { _use_global_time = true; } + static void disable_global_time() { _use_global_time = false; } + static jlong read_global_time(); + static void update_global_time(); + 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(); + + // 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); + // 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; + } + + // 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); + static bool commit_memory(char* addr, size_t size, size_t alignment_hint); + static bool uncommit_memory(char* addr, size_t bytes); + static bool release_memory(char* addr, size_t bytes); + static bool protect_memory(char* addr, size_t bytes); + static bool guard_memory(char* addr, size_t bytes); + static bool unguard_memory(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 void numa_make_local(char *addr, size_t bytes); + 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); + 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(); + + // 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) { + address thr_addr; + if (UseMembar) return false; + // Calculate thread specific address + if (thread == NULL) return false; + // TODO-FIXME: some platforms mask off faulting addresses to the base pagesize. + // Instead of using a test for equality we should probably use something + // of the form: + // return ((_mem_serialize_page ^ addr) & -pagesize) == 0 + // + thr_addr = (address)(((uintptr_t)thread >> + get_serialize_page_shift_count()) & + get_serialize_page_mask()) + (uintptr_t)_mem_serialize_page; + return (thr_addr == addr); + } + + 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 + }; + + 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(); + // hpi::read for calls from non native state + // For performance, hpi::read is only callable from _thread_in_native + static size_t read(int fd, void *buf, unsigned int nBytes); + 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(); + + // 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); + + // 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); + + // 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_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); + + // 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 (this info used to find hpi). + static void jvm_path(char *buf, jint buflen); + + // 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 + + // 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 + #include "incls/_os_pd.hpp.incl" + + // debugging support (mostly used by debug.cpp) + static bool find(address pc) PRODUCT_RETURN0; // 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); +}; + +// 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) ;