Mon, 19 Dec 2011 10:02:05 -0800
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
Summary: Replaces calls to os::javaTimeMillis(), which does not (and cannot) guarantee monotonicity, in GC code to an equivalent expression that uses os::javaTimeNanos(). os::javaTimeNanos is guaranteed monotonically non-decreasing if the underlying platform provides a monotonic time source. Changes in OS files are to make use of the newly defined constants in globalDefinitions.hpp.
Reviewed-by: dholmes, ysr
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25 #ifndef OS_WINDOWS_VM_OS_WINDOWS_INLINE_HPP
26 #define OS_WINDOWS_VM_OS_WINDOWS_INLINE_HPP
28 #include "runtime/atomic.hpp"
29 #include "runtime/os.hpp"
30 #ifdef TARGET_OS_ARCH_windows_x86
31 # include "atomic_windows_x86.inline.hpp"
32 # include "orderAccess_windows_x86.inline.hpp"
33 #endif
35 inline const char* os::file_separator() { return "\\"; }
36 inline const char* os::line_separator() { return "\r\n"; }
37 inline const char* os::path_separator() { return ";"; }
38 inline const char* os::dll_file_extension() { return ".dll"; }
40 inline const char* os::jlong_format_specifier() { return "%I64d"; }
41 inline const char* os::julong_format_specifier() { return "%I64u"; }
43 inline const int os::default_file_open_flags() { return O_BINARY | O_NOINHERIT;}
45 // File names are case-insensitive on windows only
46 inline int os::file_name_strcmp(const char* s, const char* t) {
47 return _stricmp(s, t);
48 }
50 inline void os::dll_unload(void *lib) {
51 ::FreeLibrary((HMODULE)lib);
52 }
54 inline void* os::dll_lookup(void *lib, const char *name) {
55 return (void*)::GetProcAddress((HMODULE)lib, name);
56 }
58 // Used to improve time-sharing on some systems
59 inline void os::loop_breaker(int attempts) {}
61 inline bool os::obsolete_option(const JavaVMOption *option) {
62 return false;
63 }
65 inline bool os::uses_stack_guard_pages() {
66 return os::win32::is_nt();
67 }
69 inline bool os::allocate_stack_guard_pages() {
70 assert(uses_stack_guard_pages(), "sanity check");
71 return true;
72 }
74 inline int os::readdir_buf_size(const char *path)
75 {
76 /* As Windows doesn't use the directory entry buffer passed to
77 os::readdir() this can be as short as possible */
79 return 1;
80 }
82 // Bang the shadow pages if they need to be touched to be mapped.
83 inline void os::bang_stack_shadow_pages() {
84 // Write to each page of our new frame to force OS mapping.
85 // If we decrement stack pointer more than one page
86 // the OS may not map an intervening page into our space
87 // and may fault on a memory access to interior of our frame.
88 address sp = current_stack_pointer();
89 for (int pages = 1; pages <= StackShadowPages; pages++) {
90 *((int *)(sp - (pages * vm_page_size()))) = 0;
91 }
92 }
94 inline bool os::numa_has_static_binding() { return true; }
95 inline bool os::numa_has_group_homing() { return false; }
97 inline size_t os::read(int fd, void *buf, unsigned int nBytes) {
98 return ::read(fd, buf, nBytes);
99 }
101 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
102 return ::read(fd, buf, nBytes);
103 }
105 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
106 return ::write(fd, buf, nBytes);
107 }
109 inline int os::close(int fd) {
110 return ::close(fd);
111 }
112 #endif // OS_WINDOWS_VM_OS_WINDOWS_INLINE_HPP