path: root/nptl/init.c

/* Copyright (C) 2002-2007, 2008, 2009 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.

   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.  */

#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <pthreadP.h>
#include <atomic.h>
#include <ldsodefs.h>
#include <tls.h>
#include <fork.h>
#include <version.h>
#include <shlib-compat.h>
#include <smp.h>
#include <lowlevellock.h>
#include <kernel-features.h>


/* Size and alignment of static TLS block.  */
size_t __static_tls_size;
size_t __static_tls_align_m1;

#ifndef __ASSUME_SET_ROBUST_LIST
/* Negative if we do not have the system call and we can use it.  */
int __set_robust_list_avail;
# define set_robust_list_not_avail() \
  __set_robust_list_avail = -1
#else
# define set_robust_list_not_avail() do { } while (0)
#endif

#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
/* Nonzero if we do not have FUTEX_CLOCK_REALTIME.  */
int __have_futex_clock_realtime;
# define __set_futex_clock_realtime() \
  __have_futex_clock_realtime = 1
#else
#define __set_futex_clock_realtime() do { } while (0)
#endif

/* Version of the library, used in libthread_db to detect mismatches.  */
static const char nptl_version[] __attribute_used__ = VERSION;


#ifndef SHARED
extern void __libc_setup_tls (size_t tcbsize, size_t tcbalign);
#endif

#ifdef SHARED
static void nptl_freeres (void);


static const struct pthread_functions pthread_functions =
  {
    .ptr_pthread_attr_destroy = __pthread_attr_destroy,
# if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
    .ptr___pthread_attr_init_2_0 = __pthread_attr_init_2_0,
# endif
    .ptr___pthread_attr_init_2_1 = __pthread_attr_init_2_1,
    .ptr_pthread_attr_getdetachstate = __pthread_attr_getdetachstate,
    .ptr_pthread_attr_setdetachstate = __pthread_attr_setdetachstate,
    .ptr_pthread_attr_getinheritsched = __pthread_attr_getinheritsched,
    .ptr_pthread_attr_setinheritsched = __pthread_attr_setinheritsched,
    .ptr_pthread_attr_getschedparam = __pthread_attr_getschedparam,
    .ptr_pthread_attr_setschedparam = __pthread_attr_setschedparam,
    .ptr_pthread_attr_getschedpolicy = __pthread_attr_getschedpolicy,
    .ptr_pthread_attr_setschedpolicy = __pthread_attr_setschedpolicy,
    .ptr_pthread_attr_getscope = __pthread_attr_getscope,
    .ptr_pthread_attr_setscope = __pthread_attr_setscope,
    .ptr_pthread_condattr_destroy = __pthread_condattr_destroy,
    .ptr_pthread_condattr_init = __pthread_condattr_init,
    .ptr___pthread_cond_broadcast = __pthread_cond_broadcast,
    .ptr___pthread_cond_destroy = __pthread_cond_destroy,
    .ptr___pthread_cond_init = __pthread_cond_init,
    .ptr___pthread_cond_signal = __pthread_cond_signal,
    .ptr___pthread_cond_wait = __pthread_cond_wait,
    .ptr___pthread_cond_timedwait = __pthread_cond_timedwait,
# if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_3_2)
    .ptr___pthread_cond_broadcast_2_0 = __pthread_cond_broadcast_2_0,
    .ptr___pthread_cond_destroy_2_0 = __pthread_cond_destroy_2_0,
    .ptr___pthread_cond_init_2_0 = __pthread_cond_init_2_0,
    .ptr___pthread_cond_signal_2_0 = __pthread_cond_signal_2_0,
    .ptr___pthread_cond_wait_2_0 = __pthread_cond_wait_2_0,
    .ptr___pthread_cond_timedwait_2_0 = __pthread_cond_timedwait_2_0,
# endif
    .ptr_pthread_equal = __pthread_equal,
    .ptr___pthread_exit = __pthread_exit,
    .ptr_pthread_getschedparam = __pthread_getschedparam,
    .ptr_pthread_setschedparam = __pthread_setschedparam,
    .ptr_pthread_mutex_destroy = INTUSE(__pthread_mutex_destroy),
    .ptr_pthread_mutex_init = INTUSE(__pthread_mutex_init),
    .ptr_pthread_mutex_lock = INTUSE(__pthread_mutex_lock),
    .ptr_pthread_mutex_unlock = INTUSE(__pthread_mutex_unlock),
    .ptr_pthread_self = __pthread_self,
    .ptr_pthread_setcancelstate = __pthread_setcancelstate,
    .ptr_pthread_setcanceltype = __pthread_setcanceltype,
    .ptr___pthread_cleanup_upto = __pthread_cleanup_upto,
    .ptr___pthread_once = __pthread_once_internal,
    .ptr___pthread_rwlock_rdlock = __pthread_rwlock_rdlock_internal,
    .ptr___pthread_rwlock_wrlock = __pthread_rwlock_wrlock_internal,
    .ptr___pthread_rwlock_unlock = __pthread_rwlock_unlock_internal,
    .ptr___pthread_key_create = __pthread_key_create_internal,
    .ptr___pthread_getspecific = __pthread_getspecific_internal,
    .ptr___pthread_setspecific = __pthread_setspecific_internal,
    .ptr__pthread_cleanup_push_defer = __pthread_cleanup_push_defer,
    .ptr__pthread_cleanup_pop_restore = __pthread_cleanup_pop_restore,
    .ptr_nthreads = &__nptl_nthreads,
    .ptr___pthread_unwind = &__pthread_unwind,
    .ptr__nptl_deallocate_tsd = __nptl_deallocate_tsd,
    .ptr__nptl_setxid = __nptl_setxid,
    /* For now only the stack cache needs to be freed.  */
    .ptr_freeres = nptl_freeres
  };
# define ptr_pthread_functions &pthread_functions
#else
# define ptr_pthread_functions NULL
#endif


#ifdef SHARED
/* This function is called indirectly from the freeres code in libc.  */
static void
__libc_freeres_fn_section
nptl_freeres (void)
{
  __unwind_freeres ();
  __free_stacks (0);
}
#endif


/* For asynchronous cancellation we use a signal.  This is the handler.  */
static void
sigcancel_handler (int sig, siginfo_t *si, void *ctx)
{
#ifdef __ASSUME_CORRECT_SI_PID
  /* Determine the process ID.  It might be negative if the thread is
     in the middle of a fork() call.  */
  pid_t pid = THREAD_GETMEM (THREAD_SELF, pid);
  if (__builtin_expect (pid < 0, 0))
    pid = -pid;
#endif

  /* Safety check.  It would be po