/* Copyright (C) 2006, 2007 Free Software Foundation, Inc.   This file is part of the GNU C Library.   The GNU C Library is free software; you can redistribute it and/or   modify it under the terms of the GNU Lesser General Public   License as published by the Free Software Foundation; either   version 2.1 of the License, or (at your option) any later version.   The GNU C Library 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   Lesser General Public License for more details.   You should have received a copy of the GNU Lesser General Public   License along with the GNU C Library; if not, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  *//* We define a special synchronization primitive for AIO.  POSIX   conditional variables would be ideal but the pthread_cond_*wait   operations do not return on EINTR.  This is a requirement for   correct aio_suspend and lio_listio implementations.  */#include <assert.h>#include <signal.h>#include <pthreadP.h>#include <lowlevellock.h>#define DONT_NEED_GAI_MISC_COND	1#define GAI_MISC_NOTIFY(waitlist) \  do {									      \    if (*waitlist->counterp > 0 && --*waitlist->counterp == 0)		      \      lll_futex_wake (waitlist->counterp, 1, LLL_PRIVATE);		      \  } while (0)#define GAI_MISC_WAIT(result, futex, timeout, cancel) \  do {									      \    volatile int *futexaddr = &futex;					      \    int oldval = futex;							      \									      \    if (oldval != 0)							      \      {									      \	pthread_mutex_unlock (&__gai_requests_mutex);			      \									      \	int oldtype;							      \	if (cancel)							      \	  oldtype = LIBC_CANCEL_ASYNC ();				      \									      \	int status;							      \	do								      \	  {								      \	    status = lll_futex_timed_wait (futexaddr, oldval, timeout,	      \					   LLL_PRIVATE);		      \	    if (status != -EWOULDBLOCK)					      \	      break;							      \									      \	    oldval = *futexaddr;					      \	  }								      \	while (oldval != 0);						      \									      \	if (cancel)							      \	  LIBC_CANCEL_RESET (oldtype);					      \									      \	if (status == -EINTR)						      \	  result = EINTR;						      \	else if (status == -ETIMEDOUT)					      \	  result = EAGAIN;						      \	else								      \	  assert (status == 0 || status == -EWOULDBLOCK);		      \									      \	pthread_mutex_lock (&__gai_requests_mutex);			      \      }									      \  } while (0)#define gai_start_notify_thread __gai_start_notify_thread#define gai_create_helper_thread __gai_create_helper_threadextern inline void__gai_start_notify_thread (void){  sigset_t ss;  sigemptyset (&ss);  INTERNAL_SYSCALL_DECL (err);  INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, &ss, NULL, _NSIG / 8);}extern inline int__gai_create_helper_thread (pthread_t *threadp, void *(*tf) (void *),			    void *arg){  pthread_attr_t attr;  /* Make sure the thread is created detached.  */  pthread_attr_init (&attr);  pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);  /* The helper thread needs only very little resources.  */  (void) pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);  /* Block all signals in the helper thread.  To do this thoroughly we     temporarily have to block all signals here.  */  sigset_t ss;  sigset_t oss;  sigfillset (&ss);  INTERNAL_SYSCALL_DECL (err);  INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, &ss, &oss, _NSIG / 8);  int ret = pthread_create (threadp, &attr, tf, arg);  /* Restore the signal mask.  */  INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, &oss, NULL,		    _NSIG / 8);  (void) pthread_attr_destroy (&attr);  return ret;}#include_next <gai_misc.h>