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#include <assert.h>
#include <errno.h>
#include <pthread.h>
static void test_write_lock_unlock() {
int res;
pthread_rwlock_t rw = PTHREAD_RWLOCK_INITIALIZER;
res = pthread_rwlock_wrlock(&rw);
assert(!res);
res = pthread_rwlock_unlock(&rw);
assert(!res);
}
static void test_read_lock_unlock() {
int res;
pthread_rwlock_t rw = PTHREAD_RWLOCK_INITIALIZER;
res = pthread_rwlock_rdlock(&rw);
assert(!res);
res = pthread_rwlock_unlock(&rw);
assert(!res);
}
static void test_write_trylock_unlock() {
int res;
pthread_rwlock_t rw = PTHREAD_RWLOCK_INITIALIZER;
res = pthread_rwlock_trywrlock(&rw);
assert(!res);
res = pthread_rwlock_unlock(&rw);
assert(!res);
}
static void test_read_trylock_unlock() {
int res;
pthread_rwlock_t rw = PTHREAD_RWLOCK_INITIALIZER;
res = pthread_rwlock_tryrdlock(&rw);
assert(!res);
res = pthread_rwlock_unlock(&rw);
assert(!res);
}
static void test_write_prevents_read() {
int res;
pthread_rwlock_t rw = PTHREAD_RWLOCK_INITIALIZER;
res = pthread_rwlock_wrlock(&rw);
assert(!res);
res = pthread_rwlock_tryrdlock(&rw);
assert(res == EBUSY);
res = pthread_rwlock_unlock(&rw);
assert(!res);
}
static void test_write_prevents_write() {
int res;
pthread_rwlock_t rw = PTHREAD_RWLOCK_INITIALIZER;
res = pthread_rwlock_wrlock(&rw);
assert(!res);
res = pthread_rwlock_trywrlock(&rw);
assert(res == EBUSY);
res = pthread_rwlock_unlock(&rw);
assert(!res);
}
static void test_read_prevents_write() {
int res;
pthread_rwlock_t rw = PTHREAD_RWLOCK_INITIALIZER;
res = pthread_rwlock_rdlock(&rw);
assert(!res);
res = pthread_rwlock_trywrlock(&rw);
assert(res == EBUSY);
res = pthread_rwlock_unlock(&rw);
assert(!res);
}
static void test_read_allows_read() {
int res;
pthread_rwlock_t rw = PTHREAD_RWLOCK_INITIALIZER;
res = pthread_rwlock_rdlock(&rw);
assert(!res);
res = pthread_rwlock_tryrdlock(&rw);
assert(!res);
res = pthread_rwlock_unlock(&rw);
assert(!res);
}
static void test_attr() {
pthread_rwlockattr_t attr;
pthread_rwlockattr_init(&attr);
int pshared;
pthread_rwlockattr_getpshared(&attr, &pshared);
assert(pshared == PTHREAD_PROCESS_PRIVATE);
pthread_rwlockattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
pthread_rwlockattr_getpshared(&attr, &pshared);
assert(pshared == PTHREAD_PROCESS_SHARED);
pthread_rwlockattr_setpshared(&attr, PTHREAD_PROCESS_PRIVATE);
pthread_rwlockattr_getpshared(&attr, &pshared);
assert(pshared == PTHREAD_PROCESS_PRIVATE);
pthread_rwlockattr_destroy(&attr);
}
int main() {
test_write_lock_unlock();
test_read_lock_unlock();
test_write_trylock_unlock();
test_read_trylock_unlock();
test_write_prevents_read();
test_write_prevents_write();
test_read_prevents_write();
test_read_allows_read();
test_attr();
}
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