15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef OS_LINUX_VM_OS_LINUX_HPP
26 #define OS_LINUX_VM_OS_LINUX_HPP
27
28 // Linux_OS defines the interface to Linux operating systems
29
30 /* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */
31 typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
32
33 class Linux {
34 friend class os;
35
36 // For signal-chaining
37 #define MAXSIGNUM 32
38 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
39 static unsigned int sigs; // mask of signals that have
40 // preinstalled signal handlers
41 static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
42 // __sigaction(), signal() is loaded
43 static struct sigaction *(*get_signal_action)(int);
44 static struct sigaction *get_preinstalled_handler(int);
45 static void save_preinstalled_handler(int, struct sigaction&);
46
47 static void check_signal_handler(int sig);
48
49 // For signal flags diagnostics
50 static int sigflags[MAXSIGNUM];
51
52 static int (*_clock_gettime)(clockid_t, struct timespec *);
53 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
54
75 static julong available_memory();
76 static julong physical_memory() { return _physical_memory; }
77 static void initialize_system_info();
78
79 static int commit_memory_impl(char* addr, size_t bytes, bool exec);
80 static int commit_memory_impl(char* addr, size_t bytes,
81 size_t alignment_hint, bool exec);
82
83 static void set_glibc_version(const char *s) { _glibc_version = s; }
84 static void set_libpthread_version(const char *s) { _libpthread_version = s; }
85
86 static bool supports_variable_stack_size();
87
88 static void set_is_NPTL() { _is_NPTL = true; }
89 static void set_is_LinuxThreads() { _is_NPTL = false; }
90 static void set_is_floating_stack() { _is_floating_stack = true; }
91
92 static void rebuild_cpu_to_node_map();
93 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
94
95 static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
96
97 static void print_full_memory_info(outputStream* st);
98 static void print_distro_info(outputStream* st);
99 static void print_libversion_info(outputStream* st);
100
101 public:
102 static bool _stack_is_executable;
103 static void *dlopen_helper(const char *name, char *ebuf, int ebuflen);
104 static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen);
105
106 static void init_thread_fpu_state();
107 static int get_fpu_control_word();
108 static void set_fpu_control_word(int fpu_control);
109 static pthread_t main_thread(void) { return _main_thread; }
110 // returns kernel thread id (similar to LWP id on Solaris), which can be
111 // used to access /proc
112 static pid_t gettid();
113 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
114 static Mutex* createThread_lock(void) { return _createThread_lock; }
115 static void hotspot_sigmask(Thread* thread);
|
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef OS_LINUX_VM_OS_LINUX_HPP
26 #define OS_LINUX_VM_OS_LINUX_HPP
27
28 // Linux_OS defines the interface to Linux operating systems
29
30 /* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */
31 typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
32
33 class Linux {
34 friend class os;
35 friend class TestReserveMemorySpecial;
36
37 // For signal-chaining
38 #define MAXSIGNUM 32
39 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
40 static unsigned int sigs; // mask of signals that have
41 // preinstalled signal handlers
42 static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
43 // __sigaction(), signal() is loaded
44 static struct sigaction *(*get_signal_action)(int);
45 static struct sigaction *get_preinstalled_handler(int);
46 static void save_preinstalled_handler(int, struct sigaction&);
47
48 static void check_signal_handler(int sig);
49
50 // For signal flags diagnostics
51 static int sigflags[MAXSIGNUM];
52
53 static int (*_clock_gettime)(clockid_t, struct timespec *);
54 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
55
76 static julong available_memory();
77 static julong physical_memory() { return _physical_memory; }
78 static void initialize_system_info();
79
80 static int commit_memory_impl(char* addr, size_t bytes, bool exec);
81 static int commit_memory_impl(char* addr, size_t bytes,
82 size_t alignment_hint, bool exec);
83
84 static void set_glibc_version(const char *s) { _glibc_version = s; }
85 static void set_libpthread_version(const char *s) { _libpthread_version = s; }
86
87 static bool supports_variable_stack_size();
88
89 static void set_is_NPTL() { _is_NPTL = true; }
90 static void set_is_LinuxThreads() { _is_NPTL = false; }
91 static void set_is_floating_stack() { _is_floating_stack = true; }
92
93 static void rebuild_cpu_to_node_map();
94 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
95
96 static size_t find_large_page_size();
97 static size_t setup_large_page_size();
98
99 static bool setup_large_page_type(size_t page_size);
100 static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size);
101 static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
102
103 static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec);
104 static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec);
105 static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec);
106 static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec);
107
108 static bool release_memory_special_shm(char* base, size_t bytes);
109 static bool release_memory_special_huge_tlbfs(char* base, size_t bytes);
110
111 static void print_full_memory_info(outputStream* st);
112 static void print_distro_info(outputStream* st);
113 static void print_libversion_info(outputStream* st);
114
115 public:
116 static bool _stack_is_executable;
117 static void *dlopen_helper(const char *name, char *ebuf, int ebuflen);
118 static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen);
119
120 static void init_thread_fpu_state();
121 static int get_fpu_control_word();
122 static void set_fpu_control_word(int fpu_control);
123 static pthread_t main_thread(void) { return _main_thread; }
124 // returns kernel thread id (similar to LWP id on Solaris), which can be
125 // used to access /proc
126 static pid_t gettid();
127 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
128 static Mutex* createThread_lock(void) { return _createThread_lock; }
129 static void hotspot_sigmask(Thread* thread);
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