69 lines · cpp
1//===-- Tests for thrd_equal ----------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/threads/mtx_destroy.h"10#include "src/threads/mtx_init.h"11#include "src/threads/mtx_lock.h"12#include "src/threads/mtx_unlock.h"13#include "src/threads/thrd_create.h"14#include "src/threads/thrd_current.h"15#include "src/threads/thrd_equal.h"16#include "src/threads/thrd_join.h"17 18#include "test/IntegrationTest/test.h"19 20#include <threads.h>21 22thrd_t child_thread;23mtx_t mutex;24 25static int child_func(void *arg) {26 LIBC_NAMESPACE::mtx_lock(&mutex);27 int *ret = reinterpret_cast<int *>(arg);28 auto self = LIBC_NAMESPACE::thrd_current();29 *ret = LIBC_NAMESPACE::thrd_equal(child_thread, self);30 LIBC_NAMESPACE::mtx_unlock(&mutex);31 return 0;32}33 34TEST_MAIN() {35 // We init and lock the mutex so that we guarantee that the child thread is36 // waiting after startup.37 ASSERT_EQ(LIBC_NAMESPACE::mtx_init(&mutex, mtx_plain), int(thrd_success));38 ASSERT_EQ(LIBC_NAMESPACE::mtx_lock(&mutex), int(thrd_success));39 40 auto main_thread = LIBC_NAMESPACE::thrd_current();41 42 // The idea here is that, we start a child thread which will immediately43 // wait on |mutex|. The main thread will update the global |child_thread| var44 // and unlock |mutex|. This will give the child thread a chance to compare45 // the result of thrd_self with the |child_thread|. The result of the46 // comparison is returned in the thread arg.47 int result = 0;48 thrd_t th;49 ASSERT_EQ(LIBC_NAMESPACE::thrd_create(&th, child_func, &result),50 int(thrd_success));51 // This new thread should of course not be equal to the main thread.52 ASSERT_EQ(LIBC_NAMESPACE::thrd_equal(th, main_thread), 0);53 54 // Set the |child_thread| global var and unlock to allow the child to perform55 // the comparison.56 child_thread = th;57 ASSERT_EQ(LIBC_NAMESPACE::mtx_unlock(&mutex), int(thrd_success));58 59 int retval;60 ASSERT_EQ(LIBC_NAMESPACE::thrd_join(th, &retval), int(thrd_success));61 ASSERT_EQ(retval, 0);62 // The child thread should see that thrd_current return value is the same as63 // |child_thread|.64 ASSERT_NE(result, 0);65 66 LIBC_NAMESPACE::mtx_destroy(&mutex);67 return 0;68}69