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//===-- Tests for pthread_barrier_t ---------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/pthread/pthread_barrier_destroy.h"
#include "src/pthread/pthread_barrier_init.h"
#include "src/pthread/pthread_barrier_wait.h"
#include "src/__support/CPP/atomic.h"
#include "src/pthread/pthread_create.h"
#include "src/pthread/pthread_join.h"
#include "src/pthread/pthread_mutex_destroy.h"
#include "src/pthread/pthread_mutex_init.h"
#include "src/pthread/pthread_mutex_lock.h"
#include "src/pthread/pthread_mutex_unlock.h"
#include "src/string/memset.h"
#include "test/IntegrationTest/test.h"
#include <pthread.h>
pthread_barrier_t barrier;
LIBC_NAMESPACE::cpp::Atomic<int> counter;
void *increment_counter_and_wait(void *args) {
counter.fetch_add(1);
return reinterpret_cast<void *>(
LIBC_NAMESPACE::pthread_barrier_wait(&barrier));
}
void single_use_barrier_test(int num_threads) {
counter.set(0);
// create n - 1 ADDITIONAL threads since the current thread will also wait at
// the barrier
pthread_t threads[num_threads - 1];
LIBC_NAMESPACE::memset(&barrier, 0, sizeof(pthread_barrier_t));
ASSERT_EQ(
LIBC_NAMESPACE::pthread_barrier_init(&barrier, nullptr, num_threads), 0);
for (int i = 0; i < num_threads - 1; ++i)
LIBC_NAMESPACE::pthread_create(&threads[i], nullptr,
increment_counter_and_wait, nullptr);
uintptr_t return_val_sum =
reinterpret_cast<uintptr_t>(increment_counter_and_wait(nullptr));
ASSERT_EQ(counter.load(), num_threads);
// verify only one thread got the PTHREAD_BARRIER_SERIAL_THREAD return value
for (int i = 0; i < num_threads - 1; ++i) {
void *ret;
LIBC_NAMESPACE::pthread_join(threads[i], &ret);
if (reinterpret_cast<uintptr_t>(ret) ==
static_cast<uintptr_t>(PTHREAD_BARRIER_SERIAL_THREAD)) {
return_val_sum += reinterpret_cast<uintptr_t>(ret);
} else {
ASSERT_EQ(ret, 0);
}
}
ASSERT_EQ(return_val_sum,
static_cast<uintptr_t>(PTHREAD_BARRIER_SERIAL_THREAD));
LIBC_NAMESPACE::pthread_barrier_destroy(&barrier);
}
void reused_barrier_test() {
counter.set(0);
const int NUM_THREADS = 30;
const int REPEAT = 20;
pthread_t threads[NUM_THREADS - 1]; // subtract 1 for main thread
LIBC_NAMESPACE::memset(&barrier, 0, sizeof(pthread_barrier_t));
ASSERT_EQ(
LIBC_NAMESPACE::pthread_barrier_init(&barrier, nullptr, NUM_THREADS), 0);
for (int i = 0; i < REPEAT; ++i) {
for (int j = 0; j < NUM_THREADS - 1; ++j)
LIBC_NAMESPACE::pthread_create(&threads[j], nullptr,
increment_counter_and_wait, nullptr);
uintptr_t return_val_sum =
reinterpret_cast<uintptr_t>(increment_counter_and_wait(nullptr));
ASSERT_EQ(counter.load(), NUM_THREADS * (i + 1));
// verify only one thread got the PTHREAD_BARRIER_SERIAL_THREAD return value
for (int i = 0; i < NUM_THREADS - 1; ++i) {
void *ret;
LIBC_NAMESPACE::pthread_join(threads[i], &ret);
if (reinterpret_cast<uintptr_t>(ret) ==
static_cast<uintptr_t>(PTHREAD_BARRIER_SERIAL_THREAD)) {
return_val_sum += reinterpret_cast<uintptr_t>(ret);
} else {
ASSERT_EQ(ret, 0);
}
}
ASSERT_EQ(return_val_sum,
static_cast<uintptr_t>(PTHREAD_BARRIER_SERIAL_THREAD));
}
LIBC_NAMESPACE::pthread_barrier_destroy(&barrier);
}
void *barrier_wait(void *in) {
return reinterpret_cast<void *>(
LIBC_NAMESPACE::pthread_barrier_wait(&barrier));
}
TEST_MAIN() {
// don't create any additional threads; only use main thread
single_use_barrier_test(1);
single_use_barrier_test(30);
reused_barrier_test();
return 0;
}
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