nptl/tst-audit-threads.c

   1 /* Test multi-threading using LD_AUDIT.
   2
   3    Copyright (C) 2018 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 /* This test uses a dummy LD_AUDIT library (test-audit-threads-mod1) and a
  21    library with a huge number of functions in order to validate lazy symbol
  22    binding with an audit library.  We use one thread per CPU to test that
  23    concurrent lazy resolution does not have any defects which would cause
  24    the process to fail.  We use an LD_AUDIT library to force the testing of
  25    the relocation resolution caching code in the dynamic loader i.e.
  26    _dl_runtime_profile and _dl_profile_fixup.  */
  27
  28 #include <support/xthread.h>
  29 #include <strings.h>
  30 #include <stdlib.h>
  31 #include <sys/sysinfo.h>
  32
  33 static int do_test (void);
  34
  35 /* This test usually takes less than 3s to run.  However, there are cases that
  36    take up to 30s.  */
  37 #define TIMEOUT 60
  38 #define TEST_FUNCTION do_test ()
  39 #include "../test-skeleton.c"
  40
  41 /* Declare the functions we are going to call.  */
  42 #define externnum
  43 #include "tst-audit-threads.h"
  44 #undef externnum
  45
  46 int num_threads;
  47 pthread_barrier_t barrier;
  48
  49 void
  50 sync_all (int num)
  51 {
  52   pthread_barrier_wait (&barrier);
  53 }
  54
  55 void
  56 call_all_ret_nums (void)
  57 {
  58   /* Call each function one at a time from all threads.  */
  59 #define callnum
  60 #include "tst-audit-threads.h"
  61 #undef callnum
  62 }
  63
  64 void *
  65 thread_main (void *unused)
  66 {
  67   call_all_ret_nums ();
  68   return NULL;
  69 }
  70
  71 #define STR2(X) #X
  72 #define STR(X) STR2(X)
  73
  74 static int
  75 do_test (void)
  76 {
  77   int i;
  78   pthread_t *threads;
  79
  80   num_threads = get_nprocs ();
  81   if (num_threads <= 1)
  82     num_threads = 2;
  83
  84   /* Used to synchronize all the threads after calling each retNumN.  */
  85   xpthread_barrier_init (&barrier, NULL, num_threads);
  86
  87   threads = (pthread_t *) xcalloc (num_threads, sizeof(pthread_t));
  88   for (i = 0; i < num_threads; i++)
  89     threads[i] = xpthread_create(NULL, thread_main, NULL);
  90
  91   for (i = 0; i < num_threads; i++)
  92     xpthread_join(threads[i]);
  93
  94   free (threads);
  95
  96   return 0;
  97 }