os_linux.hpp revision 199
/*
* Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* 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 */
class Linux {
friend class os;
// For signal-chaining
#define MAXSIGNUM 32
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 address _initial_thread_stack_bottom;
static uintptr_t _initial_thread_stack_size;
static const char *_glibc_version;
static const 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 void initialize_system_info();
static void set_glibc_version(const char *s) { _glibc_version = s; }
static void set_libpthread_version(const 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; }
static void rebuild_cpu_to_node_map();
public:
static void init_thread_fpu_state();
static int get_fpu_control_word();
static void set_fpu_control_word(int fpu_control);
// returns kernel thread id (similar to LWP id on Solaris), which can be
// used to access /proc
static bool is_initial_thread(void);
static int page_size(void) { return _page_size; }
// 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.
// 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
// GNU libc and libpthread version strings
static const char *glibc_version() { return _glibc_version; }
static const char *libpthread_version() { return _libpthread_version; }
// NPTL or LinuxThreads?
static bool is_LinuxThreads() { 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();
static void libnuma_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
// Stack overflow handling
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 bool supports_fast_thread_cpu_time() {
return _supports_fast_thread_cpu_time;
}
// 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);
// 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)
// values for _state: + SR_NONE
#define SR_SUSPENDED (0x20)
public:
int suspend_action() const { return _suspend_action; }
void set_suspend_action(int x) { _suspend_action = x; }
// atomic updates for _state
void set_suspended() {
do {
}
void clear_suspended() {
do {
}
};
private:
typedef int (*sched_getcpu_func_t)(void);
typedef int (*numa_max_node_func_t)(void);
typedef int (*numa_available_func_t)(void);
static sched_getcpu_func_t _sched_getcpu;
static numa_max_node_func_t _numa_max_node;
static numa_available_func_t _numa_available;
public:
}
}
static int get_node_by_cpu(int cpu_id);
};
class PlatformEvent : public CHeapObj {
private:
volatile int _Event ;
volatile int _nParked ;
double PostPad [2] ;
public: // TODO-FIXME: make dtor private
public:
PlatformEvent() {
int status;
_Event = 0 ;
_nParked = 0 ;
}
// Use caution with reset() and fired() -- they may require MEMBARs
void park () ;
void unpark () ;
int TryPark () ;
} ;
class PlatformParker : public CHeapObj {
protected:
public: // TODO-FIXME: make dtor private
public:
PlatformParker() {
int status;
}
} ;