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/*
* rwlock6.c
*
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright (C) 1998 Ben Elliston and Ross Johnson
* Copyright (C) 1999,2000,2001 Ross Johnson
*
* Contact Email: rpj@ise.canberra.edu.au
*
* This 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.
*
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* --------------------------------------------------------------------------
*
* Check that writer locks have priority.
*
* Depends on API functions:
* pthread_rwlock_rdlock()
* pthread_rwlock_wrlock()
* pthread_rwlock_unlock()
*/
#include "test.h"
static pthread_rwlock_t rwlock1 = PTHREAD_RWLOCK_INITIALIZER;
static int bankAccount = 0;
void * wrfunc(void * arg)
{
assert(pthread_rwlock_wrlock(&rwlock1) == 0);
Sleep(2000);
bankAccount += 10;
assert(pthread_rwlock_unlock(&rwlock1) == 0);
return ((void *) bankAccount);
}
void * rdfunc(void * arg)
{
int ba = 0;
assert(pthread_rwlock_rdlock(&rwlock1) == 0);
ba = bankAccount;
assert(pthread_rwlock_unlock(&rwlock1) == 0);
ba += 10;
return ((void *) ba);
}
int
main()
{
pthread_t wrt1;
pthread_t wrt2;
pthread_t rdt;
int wr1Result = 0;
int wr2Result = 0;
int rdResult = 0;
bankAccount = 0;
assert(pthread_create(&wrt1, NULL, wrfunc, NULL) == 0);
Sleep(500);
assert(pthread_create(&wrt2, NULL, rdfunc, NULL) == 0);
Sleep(500);
assert(pthread_create(&rdt, NULL, wrfunc, NULL) == 0);
assert(pthread_join(wrt1, (void **) &wr1Result) == 0);
assert(pthread_join(wrt2, (void **) &wr2Result) == 0);
assert(pthread_join(rdt, (void **) &rdResult) == 0);
assert(wr1Result == 10);
assert(wr2Result == 20);
assert(rdResult == 20);
return 0;
}
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