// Tries reading beyond pending write.
void test_read_beyond_pending_record(void) {
printf("Starting test: read beyond pending record\n");
setup_test(0);
// Start a write.
const size_t incomplete_record_size = 10;
void* incomplete_record = census_log_start_write(incomplete_record_size);
GPR_ASSERT(incomplete_record != NULL);
const size_t complete_record_size = 20;
void* complete_record = census_log_start_write(complete_record_size);
GPR_ASSERT(complete_record != NULL);
GPR_ASSERT(complete_record != incomplete_record);
census_log_end_write(complete_record, complete_record_size);
// Now iterate over blocks to read completed records.
census_log_init_reader();
size_t bytes_available;
const void* record_read = census_log_read_next(&bytes_available);
GPR_ASSERT(complete_record == record_read);
GPR_ASSERT(complete_record_size == bytes_available);
// Complete first record.
census_log_end_write(incomplete_record, incomplete_record_size);
// Have read past the incomplete record, so read_next() should return NULL.
// NB: this test also assumes our thread did not get switched to a different
// CPU between the two start_write calls
record_read = census_log_read_next(&bytes_available);
GPR_ASSERT(record_read == NULL);
// Reset reader to get the newly completed record.
census_log_init_reader();
record_read = census_log_read_next(&bytes_available);
GPR_ASSERT(incomplete_record == record_read);
GPR_ASSERT(incomplete_record_size == bytes_available);
assert_log_empty();
census_log_shutdown();
}
/* Fills the log and verifies data. If 'no fragmentation' is true, records
are sized such that CENSUS_LOG_2_MAX_RECORD_SIZE is a multiple of record
size. If not a circular log, verifies that the number of records written
match the number of records read. */
static void fill_log(size_t log_size, int no_fragmentation, int circular_log) {
int size;
int32_t records_written;
int32_t usable_space;
int32_t records_read;
if (no_fragmentation) {
int log2size = rand() % (CENSUS_LOG_2_MAX_RECORD_SIZE + 1);
size = (1 << log2size);
} else {
while (1) {
size = 1 + (rand() % CENSUS_LOG_MAX_RECORD_SIZE);
if (CENSUS_LOG_MAX_RECORD_SIZE % size) {
break;
}
}
}
printf(" Fill record size: %d\n", size);
records_written = write_records_to_log(
0 /* writer id */, size, (log_size / size) * 2, 0 /* spin count */);
usable_space = min_usable_space(log_size, size);
GPR_ASSERT(records_written * size >= usable_space);
records_read = perform_read_iteration(size);
if (!circular_log) {
GPR_ASSERT(records_written == records_read);
}
assert_log_empty();
}
// Tests end_write() with a different size than what was specified in
// start_write().
void test_end_write_with_different_size(void) {
static const size_t START_WRITE_SIZE = 10;
static const size_t END_WRITE_SIZE = 7;
printf("Starting test: end write with different size\n");
setup_test(0);
void* record_written = census_log_start_write(START_WRITE_SIZE);
GPR_ASSERT(record_written != NULL);
census_log_end_write(record_written, END_WRITE_SIZE);
census_log_init_reader();
size_t bytes_available;
const void* record_read = census_log_read_next(&bytes_available);
GPR_ASSERT(record_written == record_read);
GPR_ASSERT(END_WRITE_SIZE == bytes_available);
assert_log_empty();
census_log_shutdown();
}
// Verifies that pending records are not available via read_next().
void test_read_pending_record(void) {
static const size_t PR_RECORD_SIZE = 1024;
printf("Starting test: read pending record\n");
setup_test(0);
// Start a write.
void* record_written = census_log_start_write(PR_RECORD_SIZE);
GPR_ASSERT(record_written != NULL);
// As write is pending, read should fail.
census_log_init_reader();
size_t bytes_available;
const void* record_read = census_log_read_next(&bytes_available);
GPR_ASSERT(record_read == NULL);
// A read followed by end_write() should succeed.
census_log_end_write(record_written, PR_RECORD_SIZE);
census_log_init_reader();
record_read = census_log_read_next(&bytes_available);
GPR_ASSERT(record_written == record_read);
GPR_ASSERT(PR_RECORD_SIZE == bytes_available);
assert_log_empty();
census_log_shutdown();
}
// Fills the log and verifies data. If 'no fragmentation' is true, records
// are sized such that CENSUS_LOG_2_MAX_RECORD_SIZE is a multiple of record
// size. If not a circular log, verifies that the number of records written
// match the number of records read.
static void fill_log(size_t log_size, int no_fragmentation, int circular_log) {
size_t size;
if (no_fragmentation) {
int log2size = rand() % (CENSUS_LOG_2_MAX_RECORD_SIZE + 1);
size = ((size_t)1 << log2size);
} else {
while (1) {
size = 1 + ((size_t)rand() % CENSUS_LOG_MAX_RECORD_SIZE);
if (CENSUS_LOG_MAX_RECORD_SIZE % size) {
break;
}
}
}
int records_written =
write_records_to_log(0 /* writer id */, size,
(int)((log_size / size) * 2), 0 /* spin count */);
int records_read = perform_read_iteration(size);
if (!circular_log) {
GPR_ASSERT(records_written == records_read);
}
assert_log_empty();
}