benchtests/thread_create-source.c

   1 /* Measure pthread_create thread creation with different stack
   2    and guard sizes.
   3
   4    Copyright (C) 2017-2019 Free Software Foundation, Inc.
   5    This file is part of the GNU C Library.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <stdio.h>
  22 #include <unistd.h>
  23 #include <support/xthread.h>
  24
  25 static size_t pgsize;
  26
  27 static void
  28 thread_create_init (void)
  29 {
  30   pgsize = sysconf (_SC_PAGESIZE);
  31 }
  32
  33 static void *
  34 thread_dummy (void *arg)
  35 {
  36   return NULL;
  37 }
  38
  39 static void
  40 thread_create (int nthreads, size_t stacksize, size_t guardsize)
  41 {
  42   pthread_attr_t attr;
  43   xpthread_attr_init (&attr);
  44
  45   stacksize = stacksize * pgsize;
  46   guardsize = guardsize * pgsize;
  47
  48   xpthread_attr_setstacksize (&attr, stacksize);
  49   xpthread_attr_setguardsize (&attr, guardsize);
  50
  51   pthread_t ts[nthreads];
  52
  53   for (int i = 0; i < nthreads; i++)
  54     ts[i] = xpthread_create (&attr, thread_dummy, NULL);
  55
  56   for (int i = 0; i < nthreads; i++)
  57     xpthread_join (ts[i]);
  58 }