nptl/init.c

   1 /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <assert.h>
  21 #include <limits.h>
  22 #include <signal.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25 #include <sys/param.h>
  26 #include <sys/resource.h>
  27 #include <pthreadP.h>
  28 #include <atomic.h>
  29 #include <ldsodefs.h>
  30 #include <tls.h>
  31 #include <fork.h>
  32 #include <version.h>
  33 #include <shlib-compat.h>
  34
  35
  36 /* XXX For the time being...  */
  37 #define __NR_set_tid_address    258
  38
  39
  40 /* Default stack size.  */
  41 size_t __default_stacksize attribute_hidden;
  42
  43 /* Size and alignment of static TLS block.  */
  44 size_t __static_tls_size;
  45 size_t __static_tls_align;
  46
  47 /* Version of the library, used in libthread_db to detect mismatches.  */
  48 static const char nptl_version[] = VERSION;
  49
  50
  51 #if defined USE_TLS && !defined SHARED
  52 extern void __libc_setup_tls (size_t tcbsize, size_t tcbalign);
  53 #endif
  54
  55
  56 #ifdef SHARED
  57 static struct pthread_functions pthread_functions =
  58   {
  59     .ptr_pthread_attr_destroy = __pthread_attr_destroy,
  60 # if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
  61     .ptr___pthread_attr_init_2_0 = __pthread_attr_init_2_0,
  62 # endif
  63     .ptr___pthread_attr_init_2_1 = __pthread_attr_init_2_1,
  64     .ptr_pthread_attr_getdetachstate = __pthread_attr_getdetachstate,
  65     .ptr_pthread_attr_setdetachstate = __pthread_attr_setdetachstate,
  66     .ptr_pthread_attr_getinheritsched = __pthread_attr_getinheritsched,
  67     .ptr_pthread_attr_setinheritsched = __pthread_attr_setinheritsched,
  68     .ptr_pthread_attr_getschedparam = __pthread_attr_getschedparam,
  69     .ptr_pthread_attr_setschedparam = __pthread_attr_setschedparam,
  70     .ptr_pthread_attr_getschedpolicy = __pthread_attr_getschedpolicy,
  71     .ptr_pthread_attr_setschedpolicy = __pthread_attr_setschedpolicy,
  72     .ptr_pthread_attr_getscope = __pthread_attr_getscope,
  73     .ptr_pthread_attr_setscope = __pthread_attr_setscope,
  74     .ptr_pthread_condattr_destroy = __pthread_condattr_destroy,
  75     .ptr_pthread_condattr_init = __pthread_condattr_init,
  76     .ptr___pthread_cond_broadcast = __pthread_cond_broadcast,
  77     .ptr___pthread_cond_destroy = __pthread_cond_destroy,
  78     .ptr___pthread_cond_init = __pthread_cond_init,
  79     .ptr___pthread_cond_signal = __pthread_cond_signal,
  80     .ptr___pthread_cond_wait = __pthread_cond_wait,
  81 # if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_3_2)
  82     .ptr___pthread_cond_broadcast_2_0 = __pthread_cond_broadcast_2_0,
  83     .ptr___pthread_cond_destroy_2_0 = __pthread_cond_destroy_2_0,
  84     .ptr___pthread_cond_init_2_0 = __pthread_cond_init_2_0,
  85     .ptr___pthread_cond_signal_2_0 = __pthread_cond_signal_2_0,
  86     .ptr___pthread_cond_wait_2_0 = __pthread_cond_wait_2_0,
  87 # endif
  88     .ptr_pthread_equal = __pthread_equal,
  89     .ptr___pthread_exit = __pthread_exit,
  90     .ptr_pthread_getschedparam = __pthread_getschedparam,
  91     .ptr_pthread_setschedparam = __pthread_setschedparam,
  92     .ptr_pthread_mutex_destroy = INTUSE(__pthread_mutex_destroy),
  93     .ptr_pthread_mutex_init = INTUSE(__pthread_mutex_init),
  94     .ptr_pthread_mutex_lock = INTUSE(__pthread_mutex_lock),
  95     .ptr_pthread_mutex_unlock = INTUSE(__pthread_mutex_unlock),
  96     .ptr_pthread_self = __pthread_self,
  97     .ptr_pthread_setcancelstate = __pthread_setcancelstate,
  98     .ptr_pthread_setcanceltype = __pthread_setcanceltype,
  99     .ptr___pthread_cleanup_upto = __pthread_cleanup_upto,
 100     .ptr___pthread_once = __pthread_once_internal,
 101     .ptr___pthread_rwlock_rdlock = __pthread_rwlock_rdlock_internal,
 102     .ptr___pthread_rwlock_wrlock = __pthread_rwlock_wrlock_internal,
 103     .ptr___pthread_rwlock_unlock = __pthread_rwlock_unlock_internal,
 104     .ptr___pthread_key_create = __pthread_key_create_internal,
 105     .ptr___pthread_getspecific = __pthread_getspecific_internal,
 106     .ptr___pthread_setspecific = __pthread_setspecific_internal,
 107     .ptr__pthread_cleanup_push_defer = __pthread_cleanup_push_defer,
 108     .ptr__pthread_cleanup_pop_restore = __pthread_cleanup_pop_restore
 109   };
 110 # define ptr_pthread_functions &pthread_functions
 111 #else
 112 # define ptr_pthread_functions NULL
 113 #endif
 114
 115
 116 /* For asynchronous cancellation we use a signal.  This is the handler.  */
 117 static void
 118 sigcancel_handler (int sig __attribute ((unused)))
 119 {
 120   struct pthread *self = THREAD_SELF;
 121
 122   while (1)
 123     {
 124       /* We are canceled now.  When canceled by another thread this flag
 125          is already set but if the signal is directly send (internally or
 126          from another process) is has to be done here.  */
 127       int oldval = THREAD_GETMEM (self, cancelhandling);
 128       int newval = oldval | CANCELED_BITMASK;
 129
 130       if (oldval == newval || (oldval & EXITING_BITMASK) != 0)
 131         /* Already canceled or exiting.  */
 132         break;
 133
 134       if (atomic_compare_and_exchange_acq (&self->cancelhandling, newval,
 135                                            oldval) == 0)
 136         {
 137           /* Set the return value.  */
 138           THREAD_SETMEM (self, result, PTHREAD_CANCELED);
 139
 140           /* Make sure asynchronous cancellation is still enabled.  */
 141           if ((newval & CANCELTYPE_BITMASK) != 0)
 142             {
 143               /* The thread is exiting now.  */
 144               atomic_bit_set (&self->cancelhandling, EXITING_BIT);
 145
 146               /* Run the registered destructors and terminate the
 147                  thread.  */
 148               __do_cancel ();
 149             }
 150
 151           break;
 152         }
 153     }
 154 }
 155
 156
 157
 158 void
 159 __pthread_initialize_minimal_internal (void)
 160 {
 161 #ifndef SHARED
 162   /* Unlike in the dynamically linked case the dynamic linker has not
 163      taken care of initializing the TLS data structures.  */
 164   __libc_setup_tls (TLS_TCB_SIZE, TLS_TCB_ALIGN);
 165
 166   /* We must prevent gcc from being clever and move any of the
 167      following code ahead of the __libc_setup_tls call.  This function
 168      will initialize the thread register which is subsequently
 169      used.  */
 170   __asm __volatile ("");
 171 #endif
 172
 173   /* Minimal initialization of the thread descriptor.  */
 174   struct pthread *pd = THREAD_SELF;
 175   INTERNAL_SYSCALL_DECL (err);
 176   pd->tid = INTERNAL_SYSCALL (set_tid_address, err, 1, &pd->tid);
 177   THREAD_SETMEM (pd, specific[0], &pd->specific_1stblock[0]);
 178   THREAD_SETMEM (pd, user_stack, true);
 179   if (LLL_LOCK_INITIALIZER != 0)
 180     THREAD_SETMEM (pd, lock, LLL_LOCK_INITIALIZER);
 181 #if HP_TIMING_AVAIL
 182   THREAD_SETMEM (pd, cpuclock_offset, GL(dl_cpuclock_offset));
 183 #endif
 184
 185   /* Initialize the list of all running threads with the main thread.  */
 186   INIT_LIST_HEAD (&__stack_user);
 187   list_add (&pd->header.data.list, &__stack_user);
 188
 189
 190   /* Install the cancellation signal handler.  If for some reason we
 191      cannot install the handler we do not abort.  Maybe we should, but
 192      it is only asynchronous cancellation which is affected.  */
 193   struct sigaction sa;
 194   sa.sa_handler = sigcancel_handler;
 195   sa.sa_flags = 0;
 196   sigemptyset (&sa.sa_mask);
 197
 198   (void) __libc_sigaction (SIGCANCEL, &sa, NULL);
 199
 200
 201   /* Determine the default allowed stack size.  This is the size used
 202      in case the user does not specify one.  */
 203   struct rlimit limit;
 204   if (getrlimit (RLIMIT_STACK, &limit) != 0
 205       || limit.rlim_cur == RLIM_INFINITY)
 206     /* The system limit is not usable.  Use an architecture-specific
 207        default.  */
 208     limit.rlim_cur = ARCH_STACK_DEFAULT_SIZE;
 209
 210 #ifdef NEED_SEPARATE_REGISTER_STACK
 211   __default_stacksize = MAX (limit.rlim_cur / 2, PTHREAD_STACK_MIN);
 212 #else
 213   __default_stacksize = MAX (limit.rlim_cur, PTHREAD_STACK_MIN);
 214 #endif
 215   /* The maximum page size better should be a multiple of the page
 216      size.  */
 217   assert (__default_stacksize % __sysconf (_SC_PAGESIZE) == 0);
 218
 219   /* Get the size of the static and alignment requirements for the TLS
 220      block.  */
 221   _dl_get_tls_static_info (&__static_tls_size, &__static_tls_align);
 222
 223   /* Make sure the size takes all the alignments into account.  */
 224   if (STACK_ALIGN > __static_tls_align)
 225     __static_tls_align = STACK_ALIGN;
 226   __static_tls_size = roundup (__static_tls_size, __static_tls_align);
 227
 228   /* Register the fork generation counter with the libc.  */
 229   __libc_pthread_init (&__fork_generation, __reclaim_stacks,
 230                        ptr_pthread_functions);
 231 }
 232 strong_alias (__pthread_initialize_minimal_internal,
 233               __pthread_initialize_minimal)