static void multiple_writers_single_reader(int circular_log) {
// Sleep interval between read iterations.
static const int READ_ITERATION_INTERVAL_IN_MSEC = 10;
// Maximum record size.
static const size_t MAX_RECORD_SIZE = 20;
// Number of records written by each writer. This is sized such that we
// will write through the entire log ~10 times.
const int NUM_RECORDS_PER_WRITER =
(int)((10 * census_log_remaining_space()) / (MAX_RECORD_SIZE / 2)) /
NUM_WRITERS;
size_t record_size = ((size_t)rand() % MAX_RECORD_SIZE) + 1;
// Create and start writers.
writer_thread_args writers[NUM_WRITERS];
int writers_count = NUM_WRITERS;
gpr_cv writers_done;
gpr_mu writers_mu; // protects writers_done and writers_count
gpr_cv_init(&writers_done);
gpr_mu_init(&writers_mu);
gpr_thd_id id;
for (int i = 0; i < NUM_WRITERS; ++i) {
writers[i].index = i;
writers[i].record_size = record_size;
writers[i].num_records = NUM_RECORDS_PER_WRITER;
writers[i].done = &writers_done;
writers[i].count = &writers_count;
writers[i].mu = &writers_mu;
gpr_thd_new(&id, &writer_thread, &writers[i], NULL);
}
// Start reader.
gpr_cv reader_done;
gpr_mu reader_mu; // protects reader_done and reader.running
reader_thread_args reader;
reader.record_size = record_size;
reader.read_iteration_interval_in_msec = READ_ITERATION_INTERVAL_IN_MSEC;
reader.total_records = NUM_WRITERS * NUM_RECORDS_PER_WRITER;
reader.stop_flag = 0;
gpr_cv_init(&reader.stop);
gpr_cv_init(&reader_done);
reader.done = &reader_done;
gpr_mu_init(&reader_mu);
reader.mu = &reader_mu;
reader.running = 1;
gpr_thd_new(&id, &reader_thread, &reader, NULL);
// Wait for writers to finish.
gpr_mu_lock(&writers_mu);
while (writers_count != 0) {
gpr_cv_wait(&writers_done, &writers_mu, gpr_inf_future(GPR_CLOCK_REALTIME));
}
gpr_mu_unlock(&writers_mu);
gpr_mu_destroy(&writers_mu);
gpr_cv_destroy(&writers_done);
gpr_mu_lock(&reader_mu);
if (circular_log) {
// Stop reader.
reader.stop_flag = 1;
gpr_cv_signal(&reader.stop);
}
// wait for reader to finish
while (reader.running) {
gpr_cv_wait(&reader_done, &reader_mu, gpr_inf_future(GPR_CLOCK_REALTIME));
}
if (circular_log) {
// Assert that there were no out-of-space errors.
GPR_ASSERT(0 == census_log_out_of_space_count());
}
gpr_mu_unlock(&reader_mu);
gpr_mu_destroy(&reader_mu);
gpr_cv_destroy(&reader_done);
if (VERBOSE) {
printf(" Reader: finished\n");
}
}
static void multiple_writers_single_reader(int circular_log) {
/* Sleep interval between read iterations. */
static const int32_t READ_ITERATION_INTERVAL_IN_MSEC = 10;
/* Number of records written by each writer. */
static const int32_t NUM_RECORDS_PER_WRITER = 10 * 1024 * 1024;
/* Maximum record size. */
static const size_t MAX_RECORD_SIZE = 10;
int ix;
gpr_thd_id id;
gpr_cv writers_done;
int writers_count = NUM_WRITERS;
gpr_mu writers_mu; /* protects writers_done and writers_count */
writer_thread_args writers[NUM_WRITERS];
gpr_cv reader_done;
gpr_mu reader_mu; /* protects reader_done and reader.running */
reader_thread_args reader;
int32_t record_size = 1 + rand() % MAX_RECORD_SIZE;
printf(" Record size: %d\n", record_size);
/* Create and start writers. */
gpr_cv_init(&writers_done);
gpr_mu_init(&writers_mu);
for (ix = 0; ix < NUM_WRITERS; ++ix) {
writers[ix].index = ix;
writers[ix].record_size = record_size;
writers[ix].num_records = NUM_RECORDS_PER_WRITER;
writers[ix].done = &writers_done;
writers[ix].count = &writers_count;
writers[ix].mu = &writers_mu;
gpr_thd_new(&id, &writer_thread, &writers[ix], NULL);
}
/* Start reader. */
reader.record_size = record_size;
reader.read_iteration_interval_in_msec = READ_ITERATION_INTERVAL_IN_MSEC;
reader.total_records = NUM_WRITERS * NUM_RECORDS_PER_WRITER;
reader.stop_flag = 0;
gpr_cv_init(&reader.stop);
gpr_cv_init(&reader_done);
reader.done = &reader_done;
gpr_mu_init(&reader_mu);
reader.mu = &reader_mu;
reader.running = 1;
gpr_thd_new(&id, &reader_thread, &reader, NULL);
/* Wait for writers to finish. */
gpr_mu_lock(&writers_mu);
while (writers_count != 0) {
gpr_cv_wait(&writers_done, &writers_mu, gpr_inf_future(GPR_CLOCK_REALTIME));
}
gpr_mu_unlock(&writers_mu);
gpr_mu_destroy(&writers_mu);
gpr_cv_destroy(&writers_done);
gpr_mu_lock(&reader_mu);
if (circular_log) {
/* Stop reader. */
reader.stop_flag = 1;
gpr_cv_signal(&reader.stop);
}
/* wait for reader to finish */
while (reader.running) {
gpr_cv_wait(&reader_done, &reader_mu, gpr_inf_future(GPR_CLOCK_REALTIME));
}
if (circular_log) {
/* Assert that there were no out-of-space errors. */
GPR_ASSERT(0 == census_log_out_of_space_count());
}
gpr_mu_unlock(&reader_mu);
gpr_mu_destroy(&reader_mu);
gpr_cv_destroy(&reader_done);
printf(" Reader: finished\n");
}
