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/*
*
* Copyright 2017 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/* Test of gpr spin-lock support. */
#include "src/core/lib/gpr/spinlock.h"
#include <stdio.h>
#include <stdlib.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/time.h>
#include "src/core/lib/gprpp/thd.h"
#include "test/core/util/test_config.h"
/* ------------------------------------------------- */
/* Tests for gpr_spinlock. */
struct test {
int thread_count; /* number of threads */
grpc_core::Thread* threads;
int64_t iterations; /* number of iterations per thread */
int64_t counter;
int incr_step; /* how much to increment/decrement refcount each time */
gpr_spinlock mu; /* protects iterations, counter */
};
/* Return pointer to a new struct test. */
static struct test* test_new(int threads, int64_t iterations, int incr_step) {
struct test* m = static_cast<struct test*>(gpr_malloc(sizeof(*m)));
m->thread_count = threads;
m->threads = static_cast<grpc_core::Thread*>(
gpr_malloc(sizeof(*m->threads) * static_cast<size_t>(threads)));
m->iterations = iterations;
m->counter = 0;
m->thread_count = 0;
m->incr_step = incr_step;
m->mu = GPR_SPINLOCK_INITIALIZER;
return m;
}
/* Return pointer to a new struct test. */
static void test_destroy(struct test* m) {
gpr_free(m->threads);
gpr_free(m);
}
/* Create m->threads threads, each running (*body)(m) */
static void test_create_threads(struct test* m, void (*body)(void* arg)) {
int i;
for (i = 0; i != m->thread_count; i++) {
m->threads[i] = grpc_core::Thread("grpc_create_threads", body, m);
m->threads[i].Start();
}
}
/* Wait until all threads report done. */
static void test_wait(struct test* m) {
int i;
for (i = 0; i != m->thread_count; i++) {
m->threads[i].Join();
}
}
/* Test several threads running (*body)(struct test *m) for increasing settings
of m->iterations, until about timeout_s to 2*timeout_s seconds have elapsed.
If extra!=NULL, run (*extra)(m) in an additional thread.
incr_step controls by how much m->refcount should be incremented/decremented
(if at all) each time in the tests.
*/
static void test(const char* name, void (*body)(void* m), int timeout_s,
int incr_step) {
int64_t iterations = 1024;
struct test* m;
gpr_timespec start = gpr_now(GPR_CLOCK_REALTIME);
gpr_timespec time_taken;
gpr_timespec deadline = gpr_time_add(
start, gpr_time_from_micros(static_cast<int64_t>(timeout_s) * 1000000,
GPR_TIMESPAN));
fprintf(stderr, "%s:", name);
fflush(stderr);
while (gpr_time_cmp(gpr_now(GPR_CLOCK_REALTIME), deadline) < 0) {
if (iterations < INT64_MAX / 2) iterations <<= 1;
fprintf(stderr, " %ld", static_cast<long>(iterations));
fflush(stderr);
m = test_new(10, iterations, incr_step);
test_create_threads(m, body);
test_wait(m);
if (m->counter != m->thread_count * m->iterations * m->incr_step) {
fprintf(stderr, "counter %ld threads %d iterations %ld\n",
static_cast<long>(m->counter), m->thread_count,
static_cast<long>(m->iterations));
fflush(stderr);
GPR_ASSERT(0);
}
test_destroy(m);
}
time_taken = gpr_time_sub(gpr_now(GPR_CLOCK_REALTIME), start);
fprintf(stderr, " done %lld.%09d s\n",
static_cast<long long>(time_taken.tv_sec),
static_cast<int>(time_taken.tv_nsec));
fflush(stderr);
}
/* Increment m->counter on each iteration; then mark thread as done. */
static void inc(void* v /*=m*/) {
struct test* m = static_cast<struct test*>(v);
int64_t i;
for (i = 0; i != m->iterations; i++) {
gpr_spinlock_lock(&m->mu);
m->counter++;
gpr_spinlock_unlock(&m->mu);
}
}
/* Increment m->counter under lock acquired with trylock, m->iterations times;
then mark thread as done. */
static void inctry(void* v /*=m*/) {
struct test* m = static_cast<struct test*>(v);
int64_t i;
for (i = 0; i != m->iterations;) {
if (gpr_spinlock_trylock(&m->mu)) {
m->counter++;
gpr_spinlock_unlock(&m->mu);
i++;
}
}
}
/* ------------------------------------------------- */
int main(int argc, char* argv[]) {
grpc::testing::TestEnvironment env(argc, argv);
test("spinlock", &inc, 1, 1);
test("spinlock try", &inctry, 1, 1);
return 0;
}
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