aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@1: /*
aoqi@1:  * This file has been modified by Loongson Technology in 2015. These
aoqi@1:  * modifications are Copyright (c) 2015 Loongson Technology, and are made
aoqi@1:  * available on the same license terms set forth above.
aoqi@1:  */
aoqi@1: 
aoqi@0: #ifndef SHARE_VM_RUNTIME_OS_HPP
aoqi@0: #define SHARE_VM_RUNTIME_OS_HPP
aoqi@0: 
aoqi@0: #include "jvmtifiles/jvmti.h"
aoqi@0: #include "runtime/atomic.hpp"
aoqi@0: #include "runtime/extendedPC.hpp"
aoqi@0: #include "runtime/handles.hpp"
aoqi@0: #include "utilities/top.hpp"
aoqi@0: #ifdef TARGET_OS_FAMILY_linux
aoqi@0: # include "jvm_linux.h"
aoqi@0: # include <setjmp.h>
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_FAMILY_solaris
aoqi@0: # include "jvm_solaris.h"
aoqi@0: # include <setjmp.h>
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_FAMILY_windows
aoqi@0: # include "jvm_windows.h"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_FAMILY_aix
aoqi@0: # include "jvm_aix.h"
aoqi@0: # include <setjmp.h>
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_FAMILY_bsd
aoqi@0: # include "jvm_bsd.h"
aoqi@0: # include <setjmp.h>
aoqi@0: # ifdef __APPLE__
aoqi@0: #  include <mach/mach_time.h>
aoqi@0: # endif
aoqi@0: #endif
aoqi@0: 
aoqi@0: class AgentLibrary;
aoqi@0: 
aoqi@0: // os defines the interface to operating system; this includes traditional
aoqi@0: // OS services (time, I/O) as well as other functionality with system-
aoqi@0: // dependent code.
aoqi@0: 
aoqi@0: typedef void (*dll_func)(...);
aoqi@0: 
aoqi@0: class Thread;
aoqi@0: class JavaThread;
aoqi@0: class Event;
aoqi@0: class DLL;
aoqi@0: class FileHandle;
aoqi@0: template<class E> class GrowableArray;
aoqi@0: 
aoqi@0: // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
aoqi@0: 
aoqi@0: // Platform-independent error return values from OS functions
aoqi@0: enum OSReturn {
aoqi@0:   OS_OK         =  0,        // Operation was successful
aoqi@0:   OS_ERR        = -1,        // Operation failed
aoqi@0:   OS_INTRPT     = -2,        // Operation was interrupted
aoqi@0:   OS_TIMEOUT    = -3,        // Operation timed out
aoqi@0:   OS_NOMEM      = -5,        // Operation failed for lack of memory
aoqi@0:   OS_NORESOURCE = -6         // Operation failed for lack of nonmemory resource
aoqi@0: };
aoqi@0: 
aoqi@0: enum ThreadPriority {        // JLS 20.20.1-3
aoqi@0:   NoPriority       = -1,     // Initial non-priority value
aoqi@0:   MinPriority      =  1,     // Minimum priority
aoqi@0:   NormPriority     =  5,     // Normal (non-daemon) priority
aoqi@0:   NearMaxPriority  =  9,     // High priority, used for VMThread
aoqi@0:   MaxPriority      = 10,     // Highest priority, used for WatcherThread
aoqi@0:                              // ensures that VMThread doesn't starve profiler
aoqi@0:   CriticalPriority = 11      // Critical thread priority
aoqi@0: };
aoqi@0: 
aoqi@0: // Executable parameter flag for os::commit_memory() and
aoqi@0: // os::commit_memory_or_exit().
aoqi@0: const bool ExecMem = true;
aoqi@0: 
aoqi@0: // Typedef for structured exception handling support
aoqi@0: typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
aoqi@0: 
aoqi@0: class os: AllStatic {
aoqi@0:   friend class VMStructs;
aoqi@0: 
aoqi@0:  public:
aoqi@0:   enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
aoqi@0: 
aoqi@0:  private:
aoqi@0:   static OSThread*          _starting_thread;
aoqi@0:   static address            _polling_page;
aoqi@0:   static volatile int32_t * _mem_serialize_page;
aoqi@0:   static uintptr_t          _serialize_page_mask;
aoqi@0:  public:
aoqi@0:   static size_t             _page_sizes[page_sizes_max];
aoqi@0: 
aoqi@0:  private:
aoqi@0:   static void init_page_sizes(size_t default_page_size) {
aoqi@0:     _page_sizes[0] = default_page_size;
aoqi@0:     _page_sizes[1] = 0; // sentinel
aoqi@0:   }
aoqi@0: 
aoqi@0:   static char*  pd_reserve_memory(size_t bytes, char* addr = 0,
aoqi@0:                                size_t alignment_hint = 0);
aoqi@0:   static char*  pd_attempt_reserve_memory_at(size_t bytes, char* addr);
aoqi@0:   static void   pd_split_reserved_memory(char *base, size_t size,
aoqi@0:                                       size_t split, bool realloc);
aoqi@0:   static bool   pd_commit_memory(char* addr, size_t bytes, bool executable);
aoqi@0:   static bool   pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
aoqi@0:                                  bool executable);
aoqi@0:   // Same as pd_commit_memory() that either succeeds or calls
aoqi@0:   // vm_exit_out_of_memory() with the specified mesg.
aoqi@0:   static void   pd_commit_memory_or_exit(char* addr, size_t bytes,
aoqi@0:                                          bool executable, const char* mesg);
aoqi@0:   static void   pd_commit_memory_or_exit(char* addr, size_t size,
aoqi@0:                                          size_t alignment_hint,
aoqi@0:                                          bool executable, const char* mesg);
aoqi@0:   static bool   pd_uncommit_memory(char* addr, size_t bytes);
aoqi@0:   static bool   pd_release_memory(char* addr, size_t bytes);
aoqi@0: 
aoqi@0:   static char*  pd_map_memory(int fd, const char* file_name, size_t file_offset,
aoqi@0:                            char *addr, size_t bytes, bool read_only = false,
aoqi@0:                            bool allow_exec = false);
aoqi@0:   static char*  pd_remap_memory(int fd, const char* file_name, size_t file_offset,
aoqi@0:                              char *addr, size_t bytes, bool read_only,
aoqi@0:                              bool allow_exec);
aoqi@0:   static bool   pd_unmap_memory(char *addr, size_t bytes);
aoqi@0:   static void   pd_free_memory(char *addr, size_t bytes, size_t alignment_hint);
aoqi@0:   static void   pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint);
aoqi@0: 
aoqi@0: 
aoqi@0:  public:
aoqi@0:   static void init(void);                      // Called before command line parsing
aoqi@0:   static void init_before_ergo(void);          // Called after command line parsing
aoqi@0:                                                // before VM ergonomics processing.
aoqi@0:   static jint init_2(void);                    // Called after command line parsing
aoqi@0:                                                // and VM ergonomics processing
aoqi@0:   static void init_globals(void) {             // Called from init_globals() in init.cpp
aoqi@0:     init_globals_ext();
aoqi@0:   }
aoqi@0:   static void init_3(void);                    // Called at the end of vm init
aoqi@0: 
aoqi@0:   // File names are case-insensitive on windows only
aoqi@0:   // Override me as needed
aoqi@0:   static int    file_name_strcmp(const char* s1, const char* s2);
aoqi@0: 
aoqi@0:   static bool getenv(const char* name, char* buffer, int len);
aoqi@0:   static bool have_special_privileges();
aoqi@0: 
aoqi@0:   static jlong  javaTimeMillis();
aoqi@0:   static jlong  javaTimeNanos();
aoqi@0:   static void   javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
aoqi@0:   static void   run_periodic_checks();
aoqi@0: 
aoqi@0: 
aoqi@0:   // Returns the elapsed time in seconds since the vm started.
aoqi@0:   static double elapsedTime();
aoqi@0: 
aoqi@0:   // Returns real time in seconds since an arbitrary point
aoqi@0:   // in the past.
aoqi@0:   static bool getTimesSecs(double* process_real_time,
aoqi@0:                            double* process_user_time,
aoqi@0:                            double* process_system_time);
aoqi@0: 
aoqi@0:   // Interface to the performance counter
aoqi@0:   static jlong elapsed_counter();
aoqi@0:   static jlong elapsed_frequency();
aoqi@0: 
aoqi@0:   // The "virtual time" of a thread is the amount of time a thread has
aoqi@0:   // actually run.  The first function indicates whether the OS supports
aoqi@0:   // this functionality for the current thread, and if so:
aoqi@0:   //   * the second enables vtime tracking (if that is required).
aoqi@0:   //   * the third tells whether vtime is enabled.
aoqi@0:   //   * the fourth returns the elapsed virtual time for the current
aoqi@0:   //     thread.
aoqi@0:   static bool supports_vtime();
aoqi@0:   static bool enable_vtime();
aoqi@0:   static bool vtime_enabled();
aoqi@0:   static double elapsedVTime();
aoqi@0: 
aoqi@0:   // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
aoqi@0:   // It is MT safe, but not async-safe, as reading time zone
aoqi@0:   // information may require a lock on some platforms.
aoqi@0:   static char*      local_time_string(char *buf, size_t buflen);
aoqi@0:   static struct tm* localtime_pd     (const time_t* clock, struct tm*  res);
aoqi@0:   // Fill in buffer with current local time as an ISO-8601 string.
aoqi@0:   // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
aoqi@0:   // Returns buffer, or NULL if it failed.
aoqi@0:   static char* iso8601_time(char* buffer, size_t buffer_length);
aoqi@0: 
aoqi@0:   // Interface for detecting multiprocessor system
aoqi@0:   static inline bool is_MP() {
aoqi@0:     assert(_processor_count > 0, "invalid processor count");
aoqi@0:     return _processor_count > 1 || AssumeMP;
aoqi@0:   }
aoqi@0:   static julong available_memory();
aoqi@0:   static julong physical_memory();
aoqi@0:   static bool has_allocatable_memory_limit(julong* limit);
aoqi@0:   static bool is_server_class_machine();
aoqi@0: 
aoqi@0:   // number of CPUs
aoqi@0:   static int processor_count() {
aoqi@0:     return _processor_count;
aoqi@0:   }
aoqi@0:   static void set_processor_count(int count) { _processor_count = count; }
aoqi@0: 
aoqi@0:   // Returns the number of CPUs this process is currently allowed to run on.
aoqi@0:   // Note that on some OSes this can change dynamically.
aoqi@0:   static int active_processor_count();
aoqi@0: 
aoqi@0:   // Bind processes to processors.
aoqi@0:   //     This is a two step procedure:
aoqi@0:   //     first you generate a distribution of processes to processors,
aoqi@0:   //     then you bind processes according to that distribution.
aoqi@0:   // Compute a distribution for number of processes to processors.
aoqi@0:   //    Stores the processor id's into the distribution array argument.
aoqi@0:   //    Returns true if it worked, false if it didn't.
aoqi@0:   static bool distribute_processes(uint length, uint* distribution);
aoqi@0:   // Binds the current process to a processor.
aoqi@0:   //    Returns true if it worked, false if it didn't.
aoqi@0:   static bool bind_to_processor(uint processor_id);
aoqi@0: 
aoqi@0:   // Give a name to the current thread.
aoqi@0:   static void set_native_thread_name(const char *name);
aoqi@0: 
aoqi@0:   // Interface for stack banging (predetect possible stack overflow for
aoqi@0:   // exception processing)  There are guard pages, and above that shadow
aoqi@0:   // pages for stack overflow checking.
aoqi@0:   static bool uses_stack_guard_pages();
aoqi@0:   static bool allocate_stack_guard_pages();
aoqi@0:   static void bang_stack_shadow_pages();
aoqi@0:   static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
aoqi@0: 
aoqi@0:   // OS interface to Virtual Memory
aoqi@0: 
aoqi@0:   // Return the default page size.
aoqi@0:   static int    vm_page_size();
aoqi@0: 
aoqi@0:   // Return the page size to use for a region of memory.  The min_pages argument
aoqi@0:   // is a hint intended to limit fragmentation; it says the returned page size
aoqi@0:   // should be <= region_max_size / min_pages.  Because min_pages is a hint,
aoqi@0:   // this routine may return a size larger than region_max_size / min_pages.
aoqi@0:   //
aoqi@0:   // The current implementation ignores min_pages if a larger page size is an
aoqi@0:   // exact multiple of both region_min_size and region_max_size.  This allows
aoqi@0:   // larger pages to be used when doing so would not cause fragmentation; in
aoqi@0:   // particular, a single page can be used when region_min_size ==
aoqi@0:   // region_max_size == a supported page size.
aoqi@0:   static size_t page_size_for_region(size_t region_min_size,
aoqi@0:                                      size_t region_max_size,
aoqi@0:                                      uint min_pages);
aoqi@0:   // Return the largest page size that can be used
aoqi@0:   static size_t max_page_size() {
aoqi@0:     // The _page_sizes array is sorted in descending order.
aoqi@0:     return _page_sizes[0];
aoqi@0:   }
aoqi@0: 
aoqi@0:   // Methods for tracing page sizes returned by the above method; enabled by
aoqi@0:   // TracePageSizes.  The region_{min,max}_size parameters should be the values
aoqi@0:   // passed to page_size_for_region() and page_size should be the result of that
aoqi@0:   // call.  The (optional) base and size parameters should come from the
aoqi@0:   // ReservedSpace base() and size() methods.
aoqi@0:   static void trace_page_sizes(const char* str, const size_t* page_sizes,
aoqi@0:                                int count) PRODUCT_RETURN;
aoqi@0:   static void trace_page_sizes(const char* str, const size_t region_min_size,
aoqi@0:                                const size_t region_max_size,
aoqi@0:                                const size_t page_size,
aoqi@0:                                const char* base = NULL,
aoqi@0:                                const size_t size = 0) PRODUCT_RETURN;
aoqi@0: 
aoqi@0:   static int    vm_allocation_granularity();
aoqi@0:   static char*  reserve_memory(size_t bytes, char* addr = 0,
aoqi@0:                                size_t alignment_hint = 0);
aoqi@0:   static char*  reserve_memory(size_t bytes, char* addr,
aoqi@0:                                size_t alignment_hint, MEMFLAGS flags);
aoqi@0:   static char*  reserve_memory_aligned(size_t size, size_t alignment);
aoqi@0:   static char*  attempt_reserve_memory_at(size_t bytes, char* addr);
aoqi@0:   static void   split_reserved_memory(char *base, size_t size,
aoqi@0:                                       size_t split, bool realloc);
aoqi@0:   static bool   commit_memory(char* addr, size_t bytes, bool executable);
aoqi@0:   static bool   commit_memory(char* addr, size_t size, size_t alignment_hint,
aoqi@0:                               bool executable);
aoqi@0:   // Same as commit_memory() that either succeeds or calls
aoqi@0:   // vm_exit_out_of_memory() with the specified mesg.
aoqi@0:   static void   commit_memory_or_exit(char* addr, size_t bytes,
aoqi@0:                                       bool executable, const char* mesg);
aoqi@0:   static void   commit_memory_or_exit(char* addr, size_t size,
aoqi@0:                                       size_t alignment_hint,
aoqi@0:                                       bool executable, const char* mesg);
aoqi@0:   static bool   uncommit_memory(char* addr, size_t bytes);
aoqi@0:   static bool   release_memory(char* addr, size_t bytes);
aoqi@0: 
aoqi@0:   enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
aoqi@0:   static bool   protect_memory(char* addr, size_t bytes, ProtType prot,
aoqi@0:                                bool is_committed = true);
aoqi@0: 
aoqi@0:   static bool   guard_memory(char* addr, size_t bytes);
aoqi@0:   static bool   unguard_memory(char* addr, size_t bytes);
aoqi@0:   static bool   create_stack_guard_pages(char* addr, size_t bytes);
aoqi@0:   static bool   pd_create_stack_guard_pages(char* addr, size_t bytes);
aoqi@0:   static bool   remove_stack_guard_pages(char* addr, size_t bytes);
aoqi@0: 
aoqi@0:   static char*  map_memory(int fd, const char* file_name, size_t file_offset,
aoqi@0:                            char *addr, size_t bytes, bool read_only = false,
aoqi@0:                            bool allow_exec = false);
aoqi@0:   static char*  remap_memory(int fd, const char* file_name, size_t file_offset,
aoqi@0:                              char *addr, size_t bytes, bool read_only,
aoqi@0:                              bool allow_exec);
aoqi@0:   static bool   unmap_memory(char *addr, size_t bytes);
aoqi@0:   static void   free_memory(char *addr, size_t bytes, size_t alignment_hint);
aoqi@0:   static void   realign_memory(char *addr, size_t bytes, size_t alignment_hint);
aoqi@0: 
aoqi@0:   // NUMA-specific interface
aoqi@0:   static bool   numa_has_static_binding();
aoqi@0:   static bool   numa_has_group_homing();
aoqi@0:   static void   numa_make_local(char *addr, size_t bytes, int lgrp_hint);
aoqi@0:   static void   numa_make_global(char *addr, size_t bytes);
aoqi@0:   static size_t numa_get_groups_num();
aoqi@0:   static size_t numa_get_leaf_groups(int *ids, size_t size);
aoqi@0:   static bool   numa_topology_changed();
aoqi@0:   static int    numa_get_group_id();
aoqi@1:   static int    numa_get_cpu_id();
aoqi@0: 
aoqi@0:   // Page manipulation
aoqi@0:   struct page_info {
aoqi@0:     size_t size;
aoqi@0:     int lgrp_id;
aoqi@0:   };
aoqi@0:   static bool   get_page_info(char *start, page_info* info);
aoqi@0:   static char*  scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
aoqi@0: 
aoqi@0:   static char*  non_memory_address_word();
aoqi@0:   // reserve, commit and pin the entire memory region
aoqi@0:   static char*  reserve_memory_special(size_t size, size_t alignment,
aoqi@0:                                        char* addr, bool executable);
aoqi@0:   static bool   release_memory_special(char* addr, size_t bytes);
aoqi@0:   static void   large_page_init();
aoqi@0:   static size_t large_page_size();
aoqi@0:   static bool   can_commit_large_page_memory();
aoqi@0:   static bool   can_execute_large_page_memory();
aoqi@0: 
aoqi@0:   // OS interface to polling page
aoqi@0:   static address get_polling_page()             { return _polling_page; }
aoqi@0:   static void    set_polling_page(address page) { _polling_page = page; }
aoqi@0:   static bool    is_poll_address(address addr)  { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
aoqi@0:   static void    make_polling_page_unreadable();
aoqi@0:   static void    make_polling_page_readable();
aoqi@0: 
aoqi@0:   // Routines used to serialize the thread state without using membars
aoqi@0:   static void    serialize_thread_states();
aoqi@0: 
aoqi@0:   // Since we write to the serialize page from every thread, we
aoqi@0:   // want stores to be on unique cache lines whenever possible
aoqi@0:   // in order to minimize CPU cross talk.  We pre-compute the
aoqi@0:   // amount to shift the thread* to make this offset unique to
aoqi@0:   // each thread.
aoqi@0:   static int     get_serialize_page_shift_count() {
aoqi@0:     return SerializePageShiftCount;
aoqi@0:   }
aoqi@0: 
aoqi@0:   static void     set_serialize_page_mask(uintptr_t mask) {
aoqi@0:     _serialize_page_mask = mask;
aoqi@0:   }
aoqi@0: 
aoqi@0:   static unsigned int  get_serialize_page_mask() {
aoqi@0:     return _serialize_page_mask;
aoqi@0:   }
aoqi@0: 
aoqi@0:   static void    set_memory_serialize_page(address page);
aoqi@0: 
aoqi@0:   static address get_memory_serialize_page() {
aoqi@0:     return (address)_mem_serialize_page;
aoqi@0:   }
aoqi@0: 
aoqi@0:   static inline void write_memory_serialize_page(JavaThread *thread) {
aoqi@0:     uintptr_t page_offset = ((uintptr_t)thread >>
aoqi@0:                             get_serialize_page_shift_count()) &
aoqi@0:                             get_serialize_page_mask();
aoqi@0:     *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
aoqi@0:   }
aoqi@0: 
aoqi@0:   static bool    is_memory_serialize_page(JavaThread *thread, address addr) {
aoqi@0:     if (UseMembar) return false;
aoqi@0:     // Previously this function calculated the exact address of this
aoqi@0:     // thread's serialize page, and checked if the faulting address
aoqi@0:     // was equal.  However, some platforms mask off faulting addresses
aoqi@0:     // to the page size, so now we just check that the address is
aoqi@0:     // within the page.  This makes the thread argument unnecessary,
aoqi@0:     // but we retain the NULL check to preserve existing behaviour.
aoqi@0:     if (thread == NULL) return false;
aoqi@0:     address page = (address) _mem_serialize_page;
aoqi@0:     return addr >= page && addr < (page + os::vm_page_size());
aoqi@0:   }
aoqi@0: 
aoqi@0:   static void block_on_serialize_page_trap();
aoqi@0: 
aoqi@0:   // threads
aoqi@0: 
aoqi@0:   enum ThreadType {
aoqi@0:     vm_thread,
aoqi@0:     cgc_thread,        // Concurrent GC thread
aoqi@0:     pgc_thread,        // Parallel GC thread
aoqi@0:     java_thread,
aoqi@0:     compiler_thread,
aoqi@0:     watcher_thread,
aoqi@0:     os_thread
aoqi@0:   };
aoqi@0: 
aoqi@0:   static bool create_thread(Thread* thread,
aoqi@0:                             ThreadType thr_type,
aoqi@0:                             size_t stack_size = 0);
aoqi@0:   static bool create_main_thread(JavaThread* thread);
aoqi@0:   static bool create_attached_thread(JavaThread* thread);
aoqi@0:   static void pd_start_thread(Thread* thread);
aoqi@0:   static void start_thread(Thread* thread);
aoqi@0: 
aoqi@0:   static void initialize_thread(Thread* thr);
aoqi@0:   static void free_thread(OSThread* osthread);
aoqi@0: 
aoqi@0:   // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
aoqi@0:   static intx current_thread_id();
aoqi@0:   static int current_process_id();
aoqi@0:   static int sleep(Thread* thread, jlong ms, bool interruptable);
aoqi@0:   // Short standalone OS sleep suitable for slow path spin loop.
aoqi@0:   // Ignores Thread.interrupt() (so keep it short).
aoqi@0:   // ms = 0, will sleep for the least amount of time allowed by the OS.
aoqi@0:   static void naked_short_sleep(jlong ms);
aoqi@0:   static void infinite_sleep(); // never returns, use with CAUTION
aoqi@0:   static void yield();        // Yields to all threads with same priority
aoqi@0:   enum YieldResult {
aoqi@0:     YIELD_SWITCHED = 1,         // caller descheduled, other ready threads exist & ran
aoqi@0:     YIELD_NONEREADY = 0,        // No other runnable/ready threads.
aoqi@0:                                 // platform-specific yield return immediately
aoqi@0:     YIELD_UNKNOWN = -1          // Unknown: platform doesn't support _SWITCHED or _NONEREADY
aoqi@0:     // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
aoqi@0:     // yield that can be used in lieu of blocking.
aoqi@0:   } ;
aoqi@0:   static YieldResult NakedYield () ;
aoqi@0:   static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
aoqi@0:   static void loop_breaker(int attempts);  // called from within tight loops to possibly influence time-sharing
aoqi@0:   static OSReturn set_priority(Thread* thread, ThreadPriority priority);
aoqi@0:   static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
aoqi@0: 
aoqi@0:   static void interrupt(Thread* thread);
aoqi@0:   static bool is_interrupted(Thread* thread, bool clear_interrupted);
aoqi@0: 
aoqi@0:   static int pd_self_suspend_thread(Thread* thread);
aoqi@0: 
aoqi@0:   static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
aoqi@0:   static frame      fetch_frame_from_context(void* ucVoid);
aoqi@0: 
aoqi@0:   static ExtendedPC get_thread_pc(Thread *thread);
aoqi@0:   static void breakpoint();
aoqi@0: 
aoqi@0:   static address current_stack_pointer();
aoqi@0:   static address current_stack_base();
aoqi@0:   static size_t current_stack_size();
aoqi@0: 
aoqi@0:   static void verify_stack_alignment() PRODUCT_RETURN;
aoqi@0: 
aoqi@0:   static int message_box(const char* title, const char* message);
aoqi@0:   static char* do_you_want_to_debug(const char* message);
aoqi@0: 
aoqi@0:   // run cmd in a separate process and return its exit code; or -1 on failures
aoqi@0:   static int fork_and_exec(char *cmd);
aoqi@0: 
aoqi@0:   // os::exit() is merged with vm_exit()
aoqi@0:   // static void exit(int num);
aoqi@0: 
aoqi@0:   // Terminate the VM, but don't exit the process
aoqi@0:   static void shutdown();
aoqi@0: 
aoqi@0:   // Terminate with an error.  Default is to generate a core file on platforms
aoqi@0:   // that support such things.  This calls shutdown() and then aborts.
aoqi@0:   static void abort(bool dump_core = true);
aoqi@0: 
aoqi@0:   // Die immediately, no exit hook, no abort hook, no cleanup.
aoqi@0:   static void die();
aoqi@0: 
aoqi@0:   // File i/o operations
aoqi@0:   static const int default_file_open_flags();
aoqi@0:   static int open(const char *path, int oflag, int mode);
aoqi@0:   static FILE* open(int fd, const char* mode);
aoqi@0:   static int close(int fd);
aoqi@0:   static jlong lseek(int fd, jlong offset, int whence);
aoqi@0:   static char* native_path(char *path);
aoqi@0:   static int ftruncate(int fd, jlong length);
aoqi@0:   static int fsync(int fd);
aoqi@0:   static int available(int fd, jlong *bytes);
aoqi@0: 
aoqi@0:   //File i/o operations
aoqi@0: 
aoqi@0:   static size_t read(int fd, void *buf, unsigned int nBytes);
aoqi@0:   static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
aoqi@0:   static size_t write(int fd, const void *buf, unsigned int nBytes);
aoqi@0: 
aoqi@0:   // Reading directories.
aoqi@0:   static DIR*           opendir(const char* dirname);
aoqi@0:   static int            readdir_buf_size(const char *path);
aoqi@0:   static struct dirent* readdir(DIR* dirp, dirent* dbuf);
aoqi@0:   static int            closedir(DIR* dirp);
aoqi@0: 
aoqi@0:   // Dynamic library extension
aoqi@0:   static const char*    dll_file_extension();
aoqi@0: 
aoqi@0:   static const char*    get_temp_directory();
aoqi@0:   static const char*    get_current_directory(char *buf, size_t buflen);
aoqi@0: 
aoqi@0:   // Builds a platform-specific full library path given a ld path and lib name
aoqi@0:   // Returns true if buffer contains full path to existing file, false otherwise
aoqi@0:   static bool           dll_build_name(char* buffer, size_t size,
aoqi@0:                                        const char* pathname, const char* fname);
aoqi@0: 
aoqi@0:   // Symbol lookup, find nearest function name; basically it implements
aoqi@0:   // dladdr() for all platforms. Name of the nearest function is copied
aoqi@0:   // to buf. Distance from its base address is optionally returned as offset.
aoqi@0:   // If function name is not found, buf[0] is set to '\0' and offset is
aoqi@0:   // set to -1 (if offset is non-NULL).
aoqi@0:   static bool dll_address_to_function_name(address addr, char* buf,
aoqi@0:                                            int buflen, int* offset);
aoqi@0: 
aoqi@0:   // Locate DLL/DSO. On success, full path of the library is copied to
aoqi@0:   // buf, and offset is optionally set to be the distance between addr
aoqi@0:   // and the library's base address. On failure, buf[0] is set to '\0'
aoqi@0:   // and offset is set to -1 (if offset is non-NULL).
aoqi@0:   static bool dll_address_to_library_name(address addr, char* buf,
aoqi@0:                                           int buflen, int* offset);
aoqi@0: 
aoqi@0:   // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
aoqi@0:   static bool address_is_in_vm(address addr);
aoqi@0: 
aoqi@0:   // Loads .dll/.so and
aoqi@0:   // in case of error it checks if .dll/.so was built for the
aoqi@0:   // same architecture as Hotspot is running on
aoqi@0:   static void* dll_load(const char *name, char *ebuf, int ebuflen);
aoqi@0: 
aoqi@0:   // lookup symbol in a shared library
aoqi@0:   static void* dll_lookup(void* handle, const char* name);
aoqi@0: 
aoqi@0:   // Unload library
aoqi@0:   static void  dll_unload(void *lib);
aoqi@0: 
aoqi@0:   // Return the handle of this process
aoqi@0:   static void* get_default_process_handle();
aoqi@0: 
aoqi@0:   // Check for static linked agent library
aoqi@0:   static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[],
aoqi@0:                                  size_t syms_len);
aoqi@0: 
aoqi@0:   // Find agent entry point
aoqi@0:   static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib,
aoqi@0:                                    const char *syms[], size_t syms_len);
aoqi@0: 
aoqi@0:   // Print out system information; they are called by fatal error handler.
aoqi@0:   // Output format may be different on different platforms.
aoqi@0:   static void print_os_info(outputStream* st);
aoqi@0:   static void print_os_info_brief(outputStream* st);
aoqi@0:   static void print_cpu_info(outputStream* st);
aoqi@0:   static void pd_print_cpu_info(outputStream* st);
aoqi@0:   static void print_memory_info(outputStream* st);
aoqi@0:   static void print_dll_info(outputStream* st);
aoqi@0:   static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
aoqi@0:   static void print_context(outputStream* st, void* context);
aoqi@0:   static void print_register_info(outputStream* st, void* context);
aoqi@0:   static void print_siginfo(outputStream* st, void* siginfo);
aoqi@0:   static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
aoqi@0:   static void print_date_and_time(outputStream* st);
aoqi@0: 
aoqi@0:   static void print_location(outputStream* st, intptr_t x, bool verbose = false);
aoqi@0:   static size_t lasterror(char *buf, size_t len);
aoqi@0:   static int get_last_error();
aoqi@0: 
aoqi@0:   // Determines whether the calling process is being debugged by a user-mode debugger.
aoqi@0:   static bool is_debugger_attached();
aoqi@0: 
aoqi@0:   // wait for a key press if PauseAtExit is set
aoqi@0:   static void wait_for_keypress_at_exit(void);
aoqi@0: 
aoqi@0:   // The following two functions are used by fatal error handler to trace
aoqi@0:   // native (C) frames. They are not part of frame.hpp/frame.cpp because
aoqi@0:   // frame.hpp/cpp assume thread is JavaThread, and also because different
aoqi@0:   // OS/compiler may have different convention or provide different API to
aoqi@0:   // walk C frames.
aoqi@0:   //
aoqi@0:   // We don't attempt to become a debugger, so we only follow frames if that
aoqi@0:   // does not require a lookup in the unwind table, which is part of the binary
aoqi@0:   // file but may be unsafe to read after a fatal error. So on x86, we can
aoqi@0:   // only walk stack if %ebp is used as frame pointer; on ia64, it's not
aoqi@0:   // possible to walk C stack without having the unwind table.
aoqi@0:   static bool is_first_C_frame(frame *fr);
aoqi@0:   static frame get_sender_for_C_frame(frame *fr);
aoqi@0: 
aoqi@0:   // return current frame. pc() and sp() are set to NULL on failure.
aoqi@0:   static frame      current_frame();
aoqi@0: 
aoqi@0:   static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
aoqi@0: 
aoqi@0:   // returns a string to describe the exception/signal;
aoqi@0:   // returns NULL if exception_code is not an OS exception/signal.
aoqi@0:   static const char* exception_name(int exception_code, char* buf, size_t buflen);
aoqi@0: 
aoqi@0:   // Returns native Java library, loads if necessary
aoqi@0:   static void*    native_java_library();
aoqi@0: 
aoqi@0:   // Fills in path to jvm.dll/libjvm.so (used by the Disassembler)
aoqi@0:   static void     jvm_path(char *buf, jint buflen);
aoqi@0: 
aoqi@0:   // Returns true if we are running in a headless jre.
aoqi@0:   static bool     is_headless_jre();
aoqi@0: 
aoqi@0:   // JNI names
aoqi@0:   static void     print_jni_name_prefix_on(outputStream* st, int args_size);
aoqi@0:   static void     print_jni_name_suffix_on(outputStream* st, int args_size);
aoqi@0: 
aoqi@0:   // File conventions
aoqi@0:   static const char* file_separator();
aoqi@0:   static const char* line_separator();
aoqi@0:   static const char* path_separator();
aoqi@0: 
aoqi@0:   // Init os specific system properties values
aoqi@0:   static void init_system_properties_values();
aoqi@0: 
aoqi@0:   // IO operations, non-JVM_ version.
aoqi@0:   static int stat(const char* path, struct stat* sbuf);
aoqi@0:   static bool dir_is_empty(const char* path);
aoqi@0: 
aoqi@0:   // IO operations on binary files
aoqi@0:   static int create_binary_file(const char* path, bool rewrite_existing);
aoqi@0:   static jlong current_file_offset(int fd);
aoqi@0:   static jlong seek_to_file_offset(int fd, jlong offset);
aoqi@0: 
aoqi@0:   // Thread Local Storage
aoqi@0:   static int   allocate_thread_local_storage();
aoqi@0:   static void  thread_local_storage_at_put(int index, void* value);
aoqi@0:   static void* thread_local_storage_at(int index);
aoqi@0:   static void  free_thread_local_storage(int index);
aoqi@0: 
aoqi@0:   // Stack walk
aoqi@0:   static address get_caller_pc(int n = 0);
aoqi@0: 
aoqi@0:   // General allocation (must be MT-safe)
aoqi@0:   static void* malloc  (size_t size, MEMFLAGS flags, address caller_pc = 0);
aoqi@0:   static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0);
aoqi@0:   static void  free    (void *memblock, MEMFLAGS flags = mtNone);
aoqi@0:   static bool  check_heap(bool force = false);      // verify C heap integrity
aoqi@0:   static char* strdup(const char *, MEMFLAGS flags = mtInternal);  // Like strdup
aoqi@0: 
aoqi@0: #ifndef PRODUCT
aoqi@0:   static julong num_mallocs;         // # of calls to malloc/realloc
aoqi@0:   static julong alloc_bytes;         // # of bytes allocated
aoqi@0:   static julong num_frees;           // # of calls to free
aoqi@0:   static julong free_bytes;          // # of bytes freed
aoqi@0: #endif
aoqi@0: 
aoqi@0:   // SocketInterface (ex HPI SocketInterface )
aoqi@0:   static int socket(int domain, int type, int protocol);
aoqi@0:   static int socket_close(int fd);
aoqi@0:   static int socket_shutdown(int fd, int howto);
aoqi@0:   static int recv(int fd, char* buf, size_t nBytes, uint flags);
aoqi@0:   static int send(int fd, char* buf, size_t nBytes, uint flags);
aoqi@0:   static int raw_send(int fd, char* buf, size_t nBytes, uint flags);
aoqi@0:   static int timeout(int fd, long timeout);
aoqi@0:   static int listen(int fd, int count);
aoqi@0:   static int connect(int fd, struct sockaddr* him, socklen_t len);
aoqi@0:   static int bind(int fd, struct sockaddr* him, socklen_t len);
aoqi@0:   static int accept(int fd, struct sockaddr* him, socklen_t* len);
aoqi@0:   static int recvfrom(int fd, char* buf, size_t nbytes, uint flags,
aoqi@0:                       struct sockaddr* from, socklen_t* fromlen);
aoqi@0:   static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len);
aoqi@0:   static int sendto(int fd, char* buf, size_t len, uint flags,
aoqi@0:                     struct sockaddr* to, socklen_t tolen);
aoqi@0:   static int socket_available(int fd, jint* pbytes);
aoqi@0: 
aoqi@0:   static int get_sock_opt(int fd, int level, int optname,
aoqi@0:                           char* optval, socklen_t* optlen);
aoqi@0:   static int set_sock_opt(int fd, int level, int optname,
aoqi@0:                           const char* optval, socklen_t optlen);
aoqi@0:   static int get_host_name(char* name, int namelen);
aoqi@0: 
aoqi@0:   static struct hostent* get_host_by_name(char* name);
aoqi@0: 
aoqi@0:   // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
aoqi@0:   static void  signal_init();
aoqi@0:   static void  signal_init_pd();
aoqi@0:   static void  signal_notify(int signal_number);
aoqi@0:   static void* signal(int signal_number, void* handler);
aoqi@0:   static void  signal_raise(int signal_number);
aoqi@0:   static int   signal_wait();
aoqi@0:   static int   signal_lookup();
aoqi@0:   static void* user_handler();
aoqi@0:   static void  terminate_signal_thread();
aoqi@0:   static int   sigexitnum_pd();
aoqi@0: 
aoqi@0:   // random number generation
aoqi@0:   static long random();                    // return 32bit pseudorandom number
aoqi@0:   static void init_random(long initval);   // initialize random sequence
aoqi@0: 
aoqi@0:   // Structured OS Exception support
aoqi@0:   static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
aoqi@0: 
aoqi@0:   // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits
aoqi@0:   static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize);
aoqi@0: 
aoqi@0:   // Get the default path to the core file
aoqi@0:   // Returns the length of the string
aoqi@0:   static int get_core_path(char* buffer, size_t bufferSize);
aoqi@0: 
aoqi@0:   // JVMTI & JVM monitoring and management support
aoqi@0:   // The thread_cpu_time() and current_thread_cpu_time() are only
aoqi@0:   // supported if is_thread_cpu_time_supported() returns true.
aoqi@0:   // They are not supported on Solaris T1.
aoqi@0: 
aoqi@0:   // Thread CPU Time - return the fast estimate on a platform
aoqi@0:   // On Solaris - call gethrvtime (fast) - user time only
aoqi@0:   // On Linux   - fast clock_gettime where available - user+sys
aoqi@0:   //            - otherwise: very slow /proc fs - user+sys
aoqi@0:   // On Windows - GetThreadTimes - user+sys
aoqi@0:   static jlong current_thread_cpu_time();
aoqi@0:   static jlong thread_cpu_time(Thread* t);
aoqi@0: 
aoqi@0:   // Thread CPU Time with user_sys_cpu_time parameter.
aoqi@0:   //
aoqi@0:   // If user_sys_cpu_time is true, user+sys time is returned.
aoqi@0:   // Otherwise, only user time is returned
aoqi@0:   static jlong current_thread_cpu_time(bool user_sys_cpu_time);
aoqi@0:   static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
aoqi@0: 
aoqi@0:   // Return a bunch of info about the timers.
aoqi@0:   // Note that the returned info for these two functions may be different
aoqi@0:   // on some platforms
aoqi@0:   static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
aoqi@0:   static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
aoqi@0: 
aoqi@0:   static bool is_thread_cpu_time_supported();
aoqi@0: 
aoqi@0:   // System loadavg support.  Returns -1 if load average cannot be obtained.
aoqi@0:   static int loadavg(double loadavg[], int nelem);
aoqi@0: 
aoqi@0:   // Hook for os specific jvm options that we don't want to abort on seeing
aoqi@0:   static bool obsolete_option(const JavaVMOption *option);
aoqi@0: 
aoqi@0:   // Extensions
aoqi@0: #include "runtime/os_ext.hpp"
aoqi@0: 
aoqi@0:  public:
aoqi@0:   class CrashProtectionCallback : public StackObj {
aoqi@0:   public:
aoqi@0:     virtual void call() = 0;
aoqi@0:   };
aoqi@0: 
aoqi@0:   // Platform dependent stuff
aoqi@0: #ifdef TARGET_OS_FAMILY_linux
aoqi@0: # include "os_linux.hpp"
aoqi@0: # include "os_posix.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_FAMILY_solaris
aoqi@0: # include "os_solaris.hpp"
aoqi@0: # include "os_posix.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_FAMILY_windows
aoqi@0: # include "os_windows.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_FAMILY_aix
aoqi@0: # include "os_aix.hpp"
aoqi@0: # include "os_posix.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_FAMILY_bsd
aoqi@0: # include "os_posix.hpp"
aoqi@0: # include "os_bsd.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_ARCH_linux_x86
aoqi@0: # include "os_linux_x86.hpp"
aoqi@0: #endif
aoqi@1: #ifdef TARGET_OS_ARCH_linux_mips
aoqi@1: # include "os_linux_mips.hpp"
aoqi@1: #endif
aoqi@0: #ifdef TARGET_OS_ARCH_linux_sparc
aoqi@0: # include "os_linux_sparc.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_ARCH_linux_zero
aoqi@0: # include "os_linux_zero.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_ARCH_solaris_x86
aoqi@0: # include "os_solaris_x86.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_ARCH_solaris_sparc
aoqi@0: # include "os_solaris_sparc.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_ARCH_windows_x86
aoqi@0: # include "os_windows_x86.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_ARCH_linux_arm
aoqi@0: # include "os_linux_arm.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_ARCH_linux_ppc
aoqi@0: # include "os_linux_ppc.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_ARCH_aix_ppc
aoqi@0: # include "os_aix_ppc.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_ARCH_bsd_x86
aoqi@0: # include "os_bsd_x86.hpp"
aoqi@0: #endif
aoqi@0: #ifdef TARGET_OS_ARCH_bsd_zero
aoqi@0: # include "os_bsd_zero.hpp"
aoqi@0: #endif
aoqi@0: 
aoqi@0:  public:
aoqi@0: #ifndef PLATFORM_PRINT_NATIVE_STACK
aoqi@0:   // No platform-specific code for printing the native stack.
aoqi@0:   static bool platform_print_native_stack(outputStream* st, void* context,
aoqi@0:                                           char *buf, int buf_size) {
aoqi@0:     return false;
aoqi@0:   }
aoqi@0: #endif
aoqi@0: 
aoqi@0:   // debugging support (mostly used by debug.cpp but also fatal error handler)
aoqi@0:   static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address
aoqi@0: 
aoqi@0:   static bool dont_yield();                     // when true, JVM_Yield() is nop
aoqi@0:   static void print_statistics();
aoqi@0: 
aoqi@0:   // Thread priority helpers (implemented in OS-specific part)
aoqi@0:   static OSReturn set_native_priority(Thread* thread, int native_prio);
aoqi@0:   static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
aoqi@0:   static int java_to_os_priority[CriticalPriority + 1];
aoqi@0:   // Hint to the underlying OS that a task switch would not be good.
aoqi@0:   // Void return because it's a hint and can fail.
aoqi@0:   static void hint_no_preempt();
aoqi@0: 
aoqi@0:   // Used at creation if requested by the diagnostic flag PauseAtStartup.
aoqi@0:   // Causes the VM to wait until an external stimulus has been applied
aoqi@0:   // (for Unix, that stimulus is a signal, for Windows, an external
aoqi@0:   // ResumeThread call)
aoqi@0:   static void pause();
aoqi@0: 
aoqi@0:   // Builds a platform dependent Agent_OnLoad_<libname> function name
aoqi@0:   // which is used to find statically linked in agents.
aoqi@0:   static char*  build_agent_function_name(const char *sym, const char *cname,
aoqi@0:                                           bool is_absolute_path);
aoqi@0: 
aoqi@0:   class SuspendedThreadTaskContext {
aoqi@0:   public:
aoqi@0:     SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {}
aoqi@0:     Thread* thread() const { return _thread; }
aoqi@0:     void* ucontext() const { return _ucontext; }
aoqi@0:   private:
aoqi@0:     Thread* _thread;
aoqi@0:     void* _ucontext;
aoqi@0:   };
aoqi@0: 
aoqi@0:   class SuspendedThreadTask {
aoqi@0:   public:
aoqi@0:     SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {}
aoqi@0:     virtual ~SuspendedThreadTask() {}
aoqi@0:     void run();
aoqi@0:     bool is_done() { return _done; }
aoqi@0:     virtual void do_task(const SuspendedThreadTaskContext& context) = 0;
aoqi@0:   protected:
aoqi@0:   private:
aoqi@0:     void internal_do_task();
aoqi@0:     Thread* _thread;
aoqi@0:     bool _done;
aoqi@0:   };
aoqi@0: 
aoqi@0: #ifndef TARGET_OS_FAMILY_windows
aoqi@0:   // Suspend/resume support
aoqi@0:   // Protocol:
aoqi@0:   //
aoqi@0:   // a thread starts in SR_RUNNING
aoqi@0:   //
aoqi@0:   // SR_RUNNING can go to
aoqi@0:   //   * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it
aoqi@0:   // SR_SUSPEND_REQUEST can go to
aoqi@0:   //   * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout)
aoqi@0:   //   * SR_SUSPENDED if the stopped thread receives the signal and switches state
aoqi@0:   // SR_SUSPENDED can go to
aoqi@0:   //   * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume
aoqi@0:   // SR_WAKEUP_REQUEST can go to
aoqi@0:   //   * SR_RUNNING when the stopped thread receives the signal
aoqi@0:   //   * SR_WAKEUP_REQUEST on timeout (resend the signal and try again)
aoqi@0:   class SuspendResume {
aoqi@0:    public:
aoqi@0:     enum State {
aoqi@0:       SR_RUNNING,
aoqi@0:       SR_SUSPEND_REQUEST,
aoqi@0:       SR_SUSPENDED,
aoqi@0:       SR_WAKEUP_REQUEST
aoqi@0:     };
aoqi@0: 
aoqi@0:   private:
aoqi@0:     volatile State _state;
aoqi@0: 
aoqi@0:   private:
aoqi@0:     /* try to switch state from state "from" to state "to"
aoqi@0:      * returns the state set after the method is complete
aoqi@0:      */
aoqi@0:     State switch_state(State from, State to);
aoqi@0: 
aoqi@0:   public:
aoqi@0:     SuspendResume() : _state(SR_RUNNING) { }
aoqi@0: 
aoqi@0:     State state() const { return _state; }
aoqi@0: 
aoqi@0:     State request_suspend() {
aoqi@0:       return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST);
aoqi@0:     }
aoqi@0: 
aoqi@0:     State cancel_suspend() {
aoqi@0:       return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING);
aoqi@0:     }
aoqi@0: 
aoqi@0:     State suspended() {
aoqi@0:       return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED);
aoqi@0:     }
aoqi@0: 
aoqi@0:     State request_wakeup() {
aoqi@0:       return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST);
aoqi@0:     }
aoqi@0: 
aoqi@0:     State running() {
aoqi@0:       return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING);
aoqi@0:     }
aoqi@0: 
aoqi@0:     bool is_running() const {
aoqi@0:       return _state == SR_RUNNING;
aoqi@0:     }
aoqi@0: 
aoqi@0:     bool is_suspend_request() const {
aoqi@0:       return _state == SR_SUSPEND_REQUEST;
aoqi@0:     }
aoqi@0: 
aoqi@0:     bool is_suspended() const {
aoqi@0:       return _state == SR_SUSPENDED;
aoqi@0:     }
aoqi@0:   };
aoqi@0: #endif
aoqi@0: 
aoqi@0: 
aoqi@0:  protected:
aoqi@0:   static long _rand_seed;                   // seed for random number generator
aoqi@0:   static int _processor_count;              // number of processors
aoqi@0: 
aoqi@0:   static char* format_boot_path(const char* format_string,
aoqi@0:                                 const char* home,
aoqi@0:                                 int home_len,
aoqi@0:                                 char fileSep,
aoqi@0:                                 char pathSep);
aoqi@0:   static bool set_boot_path(char fileSep, char pathSep);
aoqi@0:   static char** split_path(const char* path, int* n);
aoqi@0: 
aoqi@0: };
aoqi@0: 
aoqi@0: // Note that "PAUSE" is almost always used with synchronization
aoqi@0: // so arguably we should provide Atomic::SpinPause() instead
aoqi@0: // of the global SpinPause() with C linkage.
aoqi@0: // It'd also be eligible for inlining on many platforms.
aoqi@0: 
aoqi@0: extern "C" int SpinPause();
aoqi@0: 
aoqi@0: #endif // SHARE_VM_RUNTIME_OS_HPP