libstdc++-v3/testsuite/21_strings/basic_string/pthread4.cc

   1 // 2002-01-23  Loren J. Rittle <rittle@labs.mot.com> <ljrittle@acm.org>
   2 // Adapted from http://gcc.gnu.org/ml/gcc-bugs/2002-01/msg00679.html
   3 // which was adapted from pthread1.cc by Mike Lu <MLu@dynamicsoft.com>
   4 //
   5 // Copyright (C) 2002-2017 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12 //
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU General Public License along
  19 // with this library; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  21
  22 // { dg-do run { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* *-*-cygwin *-*-rtems* *-*-darwin* } }
  23 // { dg-options "-pthread" { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* } }
  24
  25 #include <string>
  26 #include <list>
  27 #include <pthread.h>
  28
  29 using namespace std;
  30
  31 static list<string> foo;
  32 static pthread_mutex_t fooLock = PTHREAD_MUTEX_INITIALIZER;
  33 static pthread_cond_t fooCondOverflow = PTHREAD_COND_INITIALIZER;
  34 static pthread_cond_t fooCondUnderflow = PTHREAD_COND_INITIALIZER;
  35 static unsigned max_size = 10;
  36 #if defined(__CYGWIN__)
  37 static int iters = 10000;
  38 #else
  39 static int iters = 300000;
  40 #endif
  41
  42 void*
  43 produce (void*)
  44 {
  45   for (int num = 0; num < iters; )
  46     {
  47       string str ("test string");
  48
  49       pthread_mutex_lock (&fooLock);
  50       while (foo.size () >= max_size)
  51         pthread_cond_wait (&fooCondOverflow, &fooLock);
  52       foo.push_back (str);
  53       num++;
  54       if (foo.size () >= (max_size / 2))
  55         pthread_cond_signal (&fooCondUnderflow);
  56       pthread_mutex_unlock (&fooLock);
  57     }
  58
  59   // No more data will ever be written, ensure no fini race
  60   pthread_mutex_lock (&fooLock);
  61   pthread_cond_signal (&fooCondUnderflow);
  62   pthread_mutex_unlock (&fooLock);
  63
  64   return 0;
  65 }
  66
  67 void*
  68 consume (void*)
  69 {
  70   for (int num = 0; num < iters; )
  71     {
  72       pthread_mutex_lock (&fooLock);
  73       while (foo.size () == 0)
  74         pthread_cond_wait (&fooCondUnderflow, &fooLock);
  75       while (foo.size () > 0)
  76         {
  77           string str = foo.back ();
  78           foo.pop_back ();
  79           num++;
  80         }
  81       pthread_cond_signal (&fooCondOverflow);
  82       pthread_mutex_unlock (&fooLock);
  83     }
  84
  85   return 0;
  86 }
  87
  88 int
  89 main (void)
  90 {
  91 #if defined(__sun) && defined(__svr4__) && _XOPEN_VERSION >= 500
  92   pthread_setconcurrency (2);
  93 #endif
  94
  95   pthread_t prod;
  96   pthread_create (&prod, 0, produce, 0);
  97   pthread_t cons;
  98   pthread_create (&cons, 0, consume, 0);
  99
 100   pthread_join (prod, 0);
 101   pthread_join (cons, 0);
 102
 103   return 0;
 104 }