C++ pthread_getattr_np函数代码示例

static void current_stack_region(address* bottom, size_t* size) {
  if (os::Linux::is_initial_thread()) {
    // initial thread needs special handling because pthread_getattr_np()
    // may return bogus value.
    *bottom = os::Linux::initial_thread_stack_bottom();
    *size = os::Linux::initial_thread_stack_size();
  } else {
    pthread_attr_t attr;

    int rslt = pthread_getattr_np(pthread_self(), &attr);

    // JVM needs to know exact stack location, abort if it fails
    if (rslt != 0) {
      if (rslt == ENOMEM) {
        vm_exit_out_of_memory(0, "pthread_getattr_np");
      } else {
        fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt));
      }
    }

    if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) {
      fatal("Can not locate current stack attributes!");
    }

    pthread_attr_destroy(&attr);
  }
  assert(os::current_stack_pointer() >= *bottom &&
         os::current_stack_pointer() < *bottom + *size, "just checking");
}

static int
get_stack(void **addr, size_t *size)
{
#define CHECK_ERR(expr)				\
    {int err = (expr); if (err) return err;}
#if defined HAVE_PTHREAD_GETATTR_NP || defined HAVE_PTHREAD_ATTR_GET_NP
    pthread_attr_t attr;
    size_t guard = 0;

# ifdef HAVE_PTHREAD_GETATTR_NP
    CHECK_ERR(pthread_getattr_np(pthread_self(), &attr));
#   ifdef HAVE_PTHREAD_ATTR_GETSTACK
    CHECK_ERR(pthread_attr_getstack(&attr, addr, size));
#   else
    CHECK_ERR(pthread_attr_getstackaddr(&attr, addr));
    CHECK_ERR(pthread_attr_getstacksize(&attr, size));
#   endif
    if (pthread_attr_getguardsize(&attr, &guard) == 0) {
	STACK_GROW_DIR_DETECTION;
	STACK_DIR_UPPER((void)0, (void)(*addr = (char *)*addr + guard));
	*size -= guard;
    }
# else
    CHECK_ERR(pthread_attr_init(&attr));
    CHECK_ERR(pthread_attr_get_np(pthread_self(), &attr));
    CHECK_ERR(pthread_attr_getstackaddr(&attr, addr));
    CHECK_ERR(pthread_attr_getstacksize(&attr, size));
# endif
    CHECK_ERR(pthread_attr_getguardsize(&attr, &guard));
    *size -= guard;
# ifndef HAVE_PTHREAD_GETATTR_NP
    pthread_attr_destroy(&attr);
# endif
#elif defined HAVE_PTHREAD_GET_STACKADDR_NP && defined HAVE_PTHREAD_GET_STACKSIZE_NP
    pthread_t th = pthread_self();
    *addr = pthread_get_stackaddr_np(th);
    *size = pthread_get_stacksize_np(th);
#elif defined HAVE_THR_STKSEGMENT || defined HAVE_PTHREAD_STACKSEG_NP
    stack_t stk;
# if defined HAVE_THR_STKSEGMENT
    CHECK_ERR(thr_stksegment(&stk));
# else
    CHECK_ERR(pthread_stackseg_np(pthread_self(), &stk));
# endif
    *addr = stk.ss_sp;
    *size = stk.ss_size;
#elif defined HAVE_PTHREAD_GETTHRDS_NP
    pthread_t th = pthread_self();
    struct __pthrdsinfo thinfo;
    char reg[256];
    int regsiz=sizeof(reg);
    CHECK_ERR(pthread_getthrds_np(&th, PTHRDSINFO_QUERY_ALL,
				  &thinfo, sizeof(thinfo),
				  &reg, &regsiz));
    *addr = thinfo.__pi_stackaddr;
    *size = thinfo.__pi_stacksize;
#endif
    return 0;
#undef CHECK_ERR
}

static void* run_(
	void* arg
	)
{
	pthread_mutex_t* mutex = (pthread_mutex_t*)arg;
	pthread_attr_t attr;
	void* stack_addr;
	size_t stack_size;

	pthread_getattr_np(pthread_self(), &attr);
	pthread_attr_getstack(&attr, &stack_addr, &stack_size);

	pthread_mutex_lock(mutex);

	printf("--- pthread ---\n");
	printf("thread id:          [0x%08x]\n", (unsigned int)pthread_self());
	printf("stack addr:         [%p]\n", stack_addr);
	printf("stack size:         [0x%08x]\n", stack_size);
	printf("&arg:               [%p]\n", &arg);
	printf("\n");
	raise(SIGINT);
	raise(SIGINT);

	pthread_mutex_unlock(mutex);

	return NULL;
}

static void get_stack(void **stack_addr, size_t *stack_size)
{
    pthread_attr_t attr;
    pthread_getattr_np(pthread_self(), &attr);
    pthread_attr_getstack(&attr, stack_addr, stack_size);
    pthread_attr_destroy(&attr);
}

//return 0: success, -1 fail
__LIBC_HIDDEN__ int malloc_get_stack(size_t* pthread_stack_start, size_t* pthread_stack_end) {
  pid_t pid = getpid();

  if (gettid() == pid) {
    if (pid != malloc_pid) {
      malloc_pid = pid;
      malloc_main_thread_stack_start = 0;  // reset for new process
      malloc_main_thread_stack_size = 0;
    }

    if (!malloc_main_thread_stack_start) {
      if (malloc_get_main_thread_stack(pid)) {
        return -1;
      }
    }
    *pthread_stack_start = malloc_main_thread_stack_start;
    *pthread_stack_end = malloc_main_thread_stack_start - malloc_main_thread_stack_size;
  }
  else {
    pthread_attr_t attr;
    pthread_getattr_np(pthread_self(), &attr);
    *pthread_stack_start = (size_t)attr.stack_base + attr.stack_size;
    *pthread_stack_end = (size_t)attr.stack_base;
  }
  return 0;
}

size_t get_stack_size(int main) {
    if (main) {
        // Retrieve stack size of the main thread.
        struct rlimit curr;
        if (getrlimit(RLIMIT_STACK, &curr) != 0) {
            throw_get_stack_size_failed();
        }
        return curr.rlim_cur;
    } else {
        #if defined(LEAN_MULTI_THREAD)
        pthread_attr_t attr;
        memset (&attr, 0, sizeof(attr));
        if (pthread_getattr_np(pthread_self(), &attr) != 0) {
            throw_get_stack_size_failed();
        }
        void * ptr;
        size_t result;
        if (pthread_attr_getstack (&attr, &ptr, &result) != 0) {
            throw_get_stack_size_failed();
        }
        if (pthread_attr_destroy(&attr) != 0) {
            throw_get_stack_size_failed();
        }
        return result;
        #else
        return 0;
        #endif
    }
}

static void
fct (union sigval s)
{
  mqd_t q = *(mqd_t *) s.sival_ptr;

  pthread_attr_t nattr;
  int ret = pthread_getattr_np (pthread_self (), &nattr);
  if (ret)
    {
      errno = ret;
      printf ("pthread_getattr_np failed: %m\n");
      fct_err = 1;
    }
  else
    {
      ret = pthread_attr_getguardsize (&nattr, &fct_guardsize);
      if (ret)
	{
	  errno = ret;
	  printf ("pthread_attr_getguardsize failed: %m\n");
	  fct_err = 1;
	}
      if (pthread_attr_destroy (&nattr) != 0)
	{
	  puts ("pthread_attr_destroy failed");
	  fct_err = 1;
	}
    }

  ++fct_cnt;
  fct_err |= mqsend (q);
}

int
Stack_Size_Check::svc (void)
{
  size_t my_size = 0;

#ifdef __USE_GNU
  pthread_attr_t my_attrs;
  pthread_getattr_np (pthread_self (), &my_attrs);
  pthread_attr_getstacksize (&my_attrs, &my_size);
  pthread_attr_destroy (&my_attrs);
#else
  // No known way to do this yet... feel free to fill this in.
  my_size = this->stack_size_;
#endif /* __USE_GNU */

  // The Posix docs say that the size set for the threads stack will be the
  // *minimum* size allocated (the actual size may be bigger because of
  // a) pagesize rounding, b) guardsize addition) so we can really only
  // check if we have gotten *at least* what we asked for.
  if (my_size < this->stack_size_)
    {
      ACE_ERROR ((LM_ERROR,
                  ACE_TEXT ("%t: My stack size attr %B; expected %B\n"),
                  my_size, this->stack_size_));
      this->failed_ = true;
    }
  else
    ACE_DEBUG ((LM_DEBUG,
                ACE_TEXT ("%t: My stack size attr %B; correct.\n"),
                my_size));
  return 0;
}

    void TestThreadStackSize_getstacksize()
    {
        const size_t c_stacksize = 320000;

        // set up a thread with a stack size of 'c_stacksize'
        SCXCoreLib::SCXHandle<SCXCoreLib::SCXThreadParam> p(new SCXCoreLib::SCXThreadParam());
        SCXCoreLib::SCXThreadAttr threadAttr;

        CPPUNIT_ASSERT_NO_THROW(threadAttr.SetStackSize(c_stacksize));

        SCXCoreLib::SCXThread* thread = new SCXCoreLib::SCXThread(SCXThreadTest::SimpleThreadBodyTerminate, p, &threadAttr);

        // Let's make sure the stack size is what we set it to be.
        // SCXThreadId is just a typedef of pthread_t on SCX_UNIX.
        SCXCoreLib::SCXThreadId pt = thread->GetThreadID();
        pthread_attr_t attr;

        int errorval = pthread_getattr_np(pt, &attr);
        CPPUNIT_ASSERT_EQUAL_MESSAGE("pthread_getattr_np failed", 0, errorval);

        size_t actualsize;
        errorval = pthread_attr_getstacksize(&attr, &actualsize);
        CPPUNIT_ASSERT_EQUAL_MESSAGE("pthread_attr_getstacksize failed", 0, errorval);

        // according to pthread_attr_setstacksize's man page, the allocated stack size should be
        // greater than or equal to the requested stack size
        std::stringstream ss;
        ss << "Actual stack size (" << actualsize << ") should be greater than or equal to requested size  (" << c_stacksize <<  ")";
        CPPUNIT_ASSERT_MESSAGE(ss.str(), actualsize >= c_stacksize);

        // clean up the thread
        thread->RequestTerminate();
        thread->Wait();
        delete thread;
    }

void system_get_stack(pthread_t thread, void **base, size_t *size) {
  dbg_assert(base && size);

  pthread_attr_t attr;
  dbg_check( pthread_getattr_np(thread, &attr) );
  dbg_check( pthread_attr_getstack(&attr, base, size) );
}

static void AssertDetached(pthread_t t, bool is_detached) {
  pthread_attr_t attr;
  ASSERT_EQ(0, pthread_getattr_np(t, &attr));
  int detach_state;
  ASSERT_EQ(0, pthread_attr_getdetachstate(&attr, &detach_state));
  pthread_attr_destroy(&attr);
  ASSERT_EQ(is_detached, (detach_state == PTHREAD_CREATE_DETACHED));
}

int
my_pthread_getattr_np(pthread_t __th, pthread_attr_t *__attr)
{
    assert(__attr != NULL);
    pthread_attr_t *realattr = (pthread_attr_t *) *(int *) __attr;
    assert(realattr != NULL);
    return pthread_getattr_np(__th,realattr);
}

static int my_pthread_getattr_np(pthread_t thid, pthread_attr_t *__attr)
{
    pthread_attr_t *realattr;

    realattr = malloc(sizeof(pthread_attr_t));
    *((unsigned int *)__attr) = (unsigned int) realattr;

    return pthread_getattr_np(thid, realattr);
}

size_t MachineThreads::Thread::getRegisters(MachineThreads::Thread::Registers& registers)
{
    Thread::Registers::PlatformRegisters& regs = registers.regs;
#if OS(DARWIN)
#if CPU(X86)
    unsigned user_count = sizeof(regs)/sizeof(int);
    thread_state_flavor_t flavor = i386_THREAD_STATE;
#elif CPU(X86_64)
    unsigned user_count = x86_THREAD_STATE64_COUNT;
    thread_state_flavor_t flavor = x86_THREAD_STATE64;
#elif CPU(PPC) 
    unsigned user_count = PPC_THREAD_STATE_COUNT;
    thread_state_flavor_t flavor = PPC_THREAD_STATE;
#elif CPU(PPC64)
    unsigned user_count = PPC_THREAD_STATE64_COUNT;
    thread_state_flavor_t flavor = PPC_THREAD_STATE64;
#elif CPU(ARM)
    unsigned user_count = ARM_THREAD_STATE_COUNT;
    thread_state_flavor_t flavor = ARM_THREAD_STATE;
#elif CPU(ARM64)
    unsigned user_count = ARM_THREAD_STATE64_COUNT;
    thread_state_flavor_t flavor = ARM_THREAD_STATE64;
#else
#error Unknown Architecture
#endif

    kern_return_t result = thread_get_state(platformThread, flavor, (thread_state_t)&regs, &user_count);
    if (result != KERN_SUCCESS) {
        WTFReportFatalError(__FILE__, __LINE__, WTF_PRETTY_FUNCTION, 
                            "JavaScript garbage collection failed because thread_get_state returned an error (%d). This is probably the result of running inside Rosetta, which is not supported.", result);
        CRASH();
    }
    return user_count * sizeof(uintptr_t);
// end OS(DARWIN)

#elif OS(WINDOWS)
    regs.ContextFlags = CONTEXT_INTEGER | CONTEXT_CONTROL;
    GetThreadContext(platformThreadHandle, &regs);
    return sizeof(CONTEXT);
#elif USE(PTHREADS)
    pthread_attr_init(&regs);
#if HAVE(PTHREAD_NP_H) || OS(NETBSD)
#if !OS(OPENBSD)
    // e.g. on FreeBSD 5.4, [email protected]
    pthread_attr_get_np(platformThread, &regs);
#endif
#else
    // FIXME: this function is non-portable; other POSIX systems may have different np alternatives
    pthread_getattr_np(platformThread, &regs);
#endif
    return 0;
#else
#error Need a way to get thread registers on this platform
#endif
}

void* thread(void* param)
{
	pthread_attr_t attr;
	printf("\n In thread\n" );
	pthread_getattr_np(pthread_self(), &attr);	
	read_stack_attributes(&attr);
	read_detachstate_attribute(&attr);
	read_guard_attribute(&attr);
	read_schedpolicy_attribute(&attr);
        return 0;
}