--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/os/linux/vm/os_linux.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,286 @@
+/*
+ * Copyright 1999-2007 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.
+ *
+ */
+
+// Linux_OS defines the interface to Linux operating systems
+
+/* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */
+typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
+
+class Linux {
+ friend class os;
+
+ // For signal-chaining
+#define MAXSIGNUM 32
+ static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
+ static unsigned int sigs; // mask of signals that have
+ // preinstalled signal handlers
+ static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
+ // __sigaction(), signal() is loaded
+ static struct sigaction *(*get_signal_action)(int);
+ static struct sigaction *get_preinstalled_handler(int);
+ static void save_preinstalled_handler(int, struct sigaction&);
+
+ static void check_signal_handler(int sig);
+
+ // For signal flags diagnostics
+ static int sigflags[MAXSIGNUM];
+
+ static int (*_clock_gettime)(clockid_t, struct timespec *);
+ static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
+
+ static address _initial_thread_stack_bottom;
+ static uintptr_t _initial_thread_stack_size;
+
+ static char *_glibc_version;
+ static char *_libpthread_version;
+
+ static bool _is_floating_stack;
+ static bool _is_NPTL;
+ static bool _supports_fast_thread_cpu_time;
+
+ protected:
+
+ static julong _physical_memory;
+ static pthread_t _main_thread;
+ static Mutex* _createThread_lock;
+ static int _page_size;
+
+ static julong available_memory();
+ static julong physical_memory() { return _physical_memory; }
+ static void initialize_system_info();
+
+ static void set_glibc_version(char *s) { _glibc_version = s; }
+ static void set_libpthread_version(char *s) { _libpthread_version = s; }
+
+ static bool supports_variable_stack_size();
+
+ static void set_is_NPTL() { _is_NPTL = true; }
+ static void set_is_LinuxThreads() { _is_NPTL = false; }
+ static void set_is_floating_stack() { _is_floating_stack = true; }
+
+ public:
+
+ static void init_thread_fpu_state();
+ static int get_fpu_control_word();
+ static void set_fpu_control_word(int fpu_control);
+ static pthread_t main_thread(void) { return _main_thread; }
+ // returns kernel thread id (similar to LWP id on Solaris), which can be
+ // used to access /proc
+ static pid_t gettid();
+ static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
+ static Mutex* createThread_lock(void) { return _createThread_lock; }
+ static void hotspot_sigmask(Thread* thread);
+
+ static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
+ static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
+ static bool is_initial_thread(void);
+
+ static int page_size(void) { return _page_size; }
+ static void set_page_size(int val) { _page_size = val; }
+
+ static address ucontext_get_pc(ucontext_t* uc);
+ static intptr_t* ucontext_get_sp(ucontext_t* uc);
+ static intptr_t* ucontext_get_fp(ucontext_t* uc);
+
+ // For Analyzer Forte AsyncGetCallTrace profiling support:
+ //
+ // This interface should be declared in os_linux_i486.hpp, but
+ // that file provides extensions to the os class and not the
+ // Linux class.
+ static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
+ intptr_t** ret_sp, intptr_t** ret_fp);
+
+ // This boolean allows users to forward their own non-matching signals
+ // to JVM_handle_linux_signal, harmlessly.
+ static bool signal_handlers_are_installed;
+
+ static int get_our_sigflags(int);
+ static void set_our_sigflags(int, int);
+ static void signal_sets_init();
+ static void install_signal_handlers();
+ static void set_signal_handler(int, bool);
+ static bool is_sig_ignored(int sig);
+
+ static sigset_t* unblocked_signals();
+ static sigset_t* vm_signals();
+ static sigset_t* allowdebug_blocked_signals();
+
+ // For signal-chaining
+ static struct sigaction *get_chained_signal_action(int sig);
+ static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
+
+ // GNU libc and libpthread version strings
+ static char *glibc_version() { return _glibc_version; }
+ static char *libpthread_version() { return _libpthread_version; }
+
+ // NPTL or LinuxThreads?
+ static bool is_LinuxThreads() { return !_is_NPTL; }
+ static bool is_NPTL() { return _is_NPTL; }
+
+ // NPTL is always floating stack. LinuxThreads could be using floating
+ // stack or fixed stack.
+ static bool is_floating_stack() { return _is_floating_stack; }
+
+ static void libpthread_init();
+
+ // Minimum stack size a thread can be created with (allowing
+ // the VM to completely create the thread and enter user code)
+ static size_t min_stack_allowed;
+
+ // Return default stack size or guard size for the specified thread type
+ static size_t default_stack_size(os::ThreadType thr_type);
+ static size_t default_guard_size(os::ThreadType thr_type);
+
+ static void capture_initial_stack(size_t max_size);
+
+ // Stack overflow handling
+ static bool manually_expand_stack(JavaThread * t, address addr);
+ static int max_register_window_saves_before_flushing();
+
+ // Real-time clock functions
+ static void clock_init(void);
+
+ // fast POSIX clocks support
+ static void fast_thread_clock_init(void);
+
+ static bool supports_monotonic_clock() {
+ return _clock_gettime != NULL;
+ }
+
+ static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
+ return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
+ }
+
+ static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
+ return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
+ }
+
+ static bool supports_fast_thread_cpu_time() {
+ return _supports_fast_thread_cpu_time;
+ }
+
+ static jlong fast_thread_cpu_time(clockid_t clockid);
+
+ // Stack repair handling
+
+ // none present
+
+ // LinuxThreads work-around for 6292965
+ static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
+
+
+ // Linux suspend/resume support - this helper is a shadow of its former
+ // self now that low-level suspension is barely used, and old workarounds
+ // for LinuxThreads are no longer needed.
+ class SuspendResume {
+ private:
+ volatile int _suspend_action;
+ // values for suspend_action:
+ #define SR_NONE (0x00)
+ #define SR_SUSPEND (0x01) // suspend request
+ #define SR_CONTINUE (0x02) // resume request
+
+ volatile jint _state;
+ // values for _state: + SR_NONE
+ #define SR_SUSPENDED (0x20)
+ public:
+ SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; }
+
+ int suspend_action() const { return _suspend_action; }
+ void set_suspend_action(int x) { _suspend_action = x; }
+
+ // atomic updates for _state
+ void set_suspended() {
+ jint temp, temp2;
+ do {
+ temp = _state;
+ temp2 = Atomic::cmpxchg(temp | SR_SUSPENDED, &_state, temp);
+ } while (temp2 != temp);
+ }
+ void clear_suspended() {
+ jint temp, temp2;
+ do {
+ temp = _state;
+ temp2 = Atomic::cmpxchg(temp & ~SR_SUSPENDED, &_state, temp);
+ } while (temp2 != temp);
+ }
+ bool is_suspended() { return _state & SR_SUSPENDED; }
+
+ #undef SR_SUSPENDED
+ };
+};
+
+
+class PlatformEvent : public CHeapObj {
+ private:
+ double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
+ volatile int _Event ;
+ volatile int _nParked ;
+ pthread_mutex_t _mutex [1] ;
+ pthread_cond_t _cond [1] ;
+ double PostPad [2] ;
+ Thread * _Assoc ;
+
+ public: // TODO-FIXME: make dtor private
+ ~PlatformEvent() { guarantee (0, "invariant") ; }
+
+ public:
+ PlatformEvent() {
+ int status;
+ status = pthread_cond_init (_cond, NULL);
+ assert_status(status == 0, status, "cond_init");
+ status = pthread_mutex_init (_mutex, NULL);
+ assert_status(status == 0, status, "mutex_init");
+ _Event = 0 ;
+ _nParked = 0 ;
+ _Assoc = NULL ;
+ }
+
+ // Use caution with reset() and fired() -- they may require MEMBARs
+ void reset() { _Event = 0 ; }
+ int fired() { return _Event; }
+ void park () ;
+ void unpark () ;
+ int TryPark () ;
+ int park (jlong millis) ;
+ void SetAssociation (Thread * a) { _Assoc = a ; }
+} ;
+
+class PlatformParker : public CHeapObj {
+ protected:
+ pthread_mutex_t _mutex [1] ;
+ pthread_cond_t _cond [1] ;
+
+ public: // TODO-FIXME: make dtor private
+ ~PlatformParker() { guarantee (0, "invariant") ; }
+
+ public:
+ PlatformParker() {
+ int status;
+ status = pthread_cond_init (_cond, NULL);
+ assert_status(status == 0, status, "cond_init");
+ status = pthread_mutex_init (_mutex, NULL);
+ assert_status(status == 0, status, "mutex_init");
+ }
+} ;