224 lines
7.0 KiB
C++
224 lines
7.0 KiB
C++
/*
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* Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef OS_WINDOWS_OS_WINDOWS_HPP
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#define OS_WINDOWS_OS_WINDOWS_HPP
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// Win32_OS defines the interface to windows operating systems
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// strtok_s is the Windows thread-safe equivalent of POSIX strtok_r
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#define strtok_r strtok_s
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#define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
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#define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
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// Information about the protection of the page at address '0' on this os.
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static bool zero_page_read_protected() { return true; }
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// File conventions
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static const char* file_separator() { return "\\"; }
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static const char* line_separator() { return "\r\n"; }
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static const char* path_separator() { return ";"; }
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class win32 {
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friend class os;
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friend unsigned __stdcall thread_native_entry(class Thread*);
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protected:
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static int _vm_page_size;
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static int _vm_allocation_granularity;
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static int _processor_type;
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static int _processor_level;
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static julong _physical_memory;
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static size_t _default_stack_size;
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static bool _is_windows_server;
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static bool _has_exit_bug;
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static void print_windows_version(outputStream* st);
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public:
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// Windows-specific interface:
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static void initialize_system_info();
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static void setmode_streams();
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// Processor info as provided by NT
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static int processor_type() { return _processor_type; }
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static int processor_level() {
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return _processor_level;
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}
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static julong available_memory();
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static julong physical_memory() { return _physical_memory; }
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// load dll from Windows system directory or Windows directory
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static HINSTANCE load_Windows_dll(const char* name, char *ebuf, int ebuflen);
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private:
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enum Ept { EPT_THREAD, EPT_PROCESS, EPT_PROCESS_DIE };
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// Wrapper around _endthreadex(), exit() and _exit()
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static int exit_process_or_thread(Ept what, int exit_code);
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static void initialize_performance_counter();
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public:
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// Generic interface:
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// Trace number of created threads
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static intx _os_thread_limit;
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static volatile intx _os_thread_count;
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// Tells whether this is a server version of Windows
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static bool is_windows_server() { return _is_windows_server; }
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// Tells whether there can be the race bug during process exit on this platform
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static bool has_exit_bug() { return _has_exit_bug; }
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// Returns the byte size of a virtual memory page
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static int vm_page_size() { return _vm_page_size; }
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// Returns the size in bytes of memory blocks which can be allocated.
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static int vm_allocation_granularity() { return _vm_allocation_granularity; }
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// Read the headers for the executable that started the current process into
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// the structure passed in (see winnt.h).
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static void read_executable_headers(PIMAGE_NT_HEADERS);
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// Default stack size for the current process.
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static size_t default_stack_size() { return _default_stack_size; }
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static bool get_frame_at_stack_banging_point(JavaThread* thread,
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struct _EXCEPTION_POINTERS* exceptionInfo,
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address pc, frame* fr);
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#ifndef _WIN64
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// A wrapper to install a structured exception handler for fast JNI accesors.
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static address fast_jni_accessor_wrapper(BasicType);
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#endif
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// Fast access to current thread
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protected:
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static int _thread_ptr_offset;
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private:
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static void initialize_thread_ptr_offset();
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public:
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static inline void set_thread_ptr_offset(int offset) {
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_thread_ptr_offset = offset;
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}
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static inline int get_thread_ptr_offset() { return _thread_ptr_offset; }
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};
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/*
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* Crash protection for the watcher thread. Wrap the callback
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* with a __try { call() }
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* To be able to use this - don't take locks, don't rely on destructors,
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* don't make OS library calls, don't allocate memory, don't print,
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* don't call code that could leave the heap / memory in an inconsistent state,
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* or anything else where we are not in control if we suddenly jump out.
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*/
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class ThreadCrashProtection : public StackObj {
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public:
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static bool is_crash_protected(Thread* thr) {
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return _crash_protection != NULL && _protected_thread == thr;
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}
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ThreadCrashProtection();
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bool call(os::CrashProtectionCallback& cb);
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private:
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static Thread* _protected_thread;
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static ThreadCrashProtection* _crash_protection;
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static volatile intptr_t _crash_mux;
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};
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class PlatformEvent : public CHeapObj<mtSynchronizer> {
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private:
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double CachePad [4] ; // increase odds that _Event is sole occupant of cache line
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volatile int _Event ;
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HANDLE _ParkHandle ;
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public: // TODO-FIXME: make dtor private
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~PlatformEvent() { guarantee (0, "invariant") ; }
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public:
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PlatformEvent() {
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_Event = 0 ;
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_ParkHandle = CreateEvent (NULL, false, false, NULL) ;
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guarantee (_ParkHandle != NULL, "invariant") ;
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}
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// Exercise caution using reset() and fired() - they may require MEMBARs
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void reset() { _Event = 0 ; }
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int fired() { return _Event; }
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void park () ;
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void unpark () ;
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int park (jlong millis) ;
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} ;
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class PlatformParker : public CHeapObj<mtSynchronizer> {
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protected:
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HANDLE _ParkEvent ;
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public:
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~PlatformParker () { guarantee (0, "invariant") ; }
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PlatformParker () {
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_ParkEvent = CreateEvent (NULL, true, false, NULL) ;
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guarantee (_ParkEvent != NULL, "invariant") ;
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}
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} ;
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// Platform specific implementations that underpin VM Mutex/Monitor classes
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class PlatformMutex : public CHeapObj<mtSynchronizer> {
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// Disable copying
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PlatformMutex(const PlatformMutex&);
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PlatformMutex& operator=(const PlatformMutex&);
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protected:
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CRITICAL_SECTION _mutex; // Native mutex for locking
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public:
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PlatformMutex();
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~PlatformMutex();
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void lock();
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void unlock();
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bool try_lock();
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};
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class PlatformMonitor : public PlatformMutex {
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private:
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CONDITION_VARIABLE _cond; // Native condition variable for blocking
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// Disable copying
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PlatformMonitor(const PlatformMonitor&);
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PlatformMonitor& operator=(const PlatformMonitor&);
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public:
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PlatformMonitor();
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~PlatformMonitor();
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int wait(jlong millis);
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void notify();
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void notify_all();
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};
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#endif // OS_WINDOWS_OS_WINDOWS_HPP
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