newlib-cygwin/winsup/testsuite/winsup.api/pthread/rwlock6.c

70 lines
1.3 KiB
C

/*
* rwlock6.c
*
* Check writer and reader locking
*
* 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)
{
int ba;
assert(pthread_rwlock_wrlock(&rwlock1) == 0);
Sleep(2000);
bankAccount += 10;
ba = bankAccount;
assert(pthread_rwlock_unlock(&rwlock1) == 0);
return ((void *)(size_t)ba);
}
void * rdfunc(void * arg)
{
int ba;
assert(pthread_rwlock_rdlock(&rwlock1) == 0);
ba = bankAccount;
assert(pthread_rwlock_unlock(&rwlock1) == 0);
return ((void *)(size_t)ba);
}
int
main()
{
pthread_t wrt1;
pthread_t wrt2;
pthread_t rdt;
void* wr1Result = 0;
void* wr2Result = 0;
void* rdResult = 0;
bankAccount = 0;
assert(pthread_create(&wrt1, NULL, wrfunc, NULL) == 0);
Sleep(500);
assert(pthread_create(&rdt, NULL, rdfunc, NULL) == 0);
Sleep(500);
assert(pthread_create(&wrt2, NULL, wrfunc, NULL) == 0);
assert(pthread_join(wrt1, &wr1Result) == 0);
assert(pthread_join(rdt, &rdResult) == 0);
assert(pthread_join(wrt2, &wr2Result) == 0);
assert((int)(size_t)wr1Result == 10);
assert((int)(size_t)rdResult == 20);
assert((int)(size_t)wr2Result == 20);
return 0;
}