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// Copyright 2015 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <assert.h>
#include <stdio.h>
#include <pthread.h>
#include <emscripten.h>
#include <emscripten/threading.h>
// This file tests the old GCC built-in atomic operations of the form __sync_op_and_fetch().
// See https://gcc.gnu.org/onlinedocs/gcc-4.6.4/gcc/Atomic-Builtins.html
#define NUM_THREADS 8
#define T int
void *thread_add_and_fetch(void *arg) {
for (int i = 0; i < 10000; ++i) {
__sync_add_and_fetch((int*)arg, 1);
}
pthread_exit(0);
}
void *thread_sub_and_fetch(void *arg) {
for (int i = 0; i < 10000; ++i) {
__sync_sub_and_fetch((int*)arg, 1);
}
pthread_exit(0);
}
volatile long or_and_fetch_data = 0;
void *thread_or_and_fetch(void *arg) {
for (int i = 0; i < 10000; ++i) {
__sync_or_and_fetch((long*)&or_and_fetch_data, (long)arg);
}
pthread_exit(0);
}
volatile long and_and_fetch_data = 0;
void *thread_and_and_fetch(void *arg) {
for (int i = 0; i < 10000; ++i) {
__sync_and_and_fetch((long*)&and_and_fetch_data, (long)arg);
}
pthread_exit(0);
}
volatile long xor_and_fetch_data = 0;
void *thread_xor_and_fetch(void *arg) {
for (int i = 0; i < 9999; ++i) // Odd number of times so that the operation doesn't cancel itself out.
__sync_xor_and_fetch((long*)&xor_and_fetch_data, (long)arg);
pthread_exit(0);
}
volatile long nand_and_fetch_data = 0;
void *thread_nand_and_fetch(void *arg) {
for (int i = 0; i < 9999; ++i) { // Odd number of times so that the operation doesn't cancel itself out.
__sync_nand_and_fetch((long*)&nand_and_fetch_data, (long)arg);
}
pthread_exit(0);
}
int main() {
pthread_t thread[NUM_THREADS];
{
printf("__sync_add_and_fetch ..\n");
T x = 5;
T y = __sync_add_and_fetch(&x, 10);
assert(y == 15);
assert(x == 15);
volatile int n = 1;
if (emscripten_has_threading_support())
{
for (int i = 0; i < NUM_THREADS; ++i) pthread_create(&thread[i], NULL, thread_add_and_fetch, (void*)&n);
for (int i = 0; i < NUM_THREADS; ++i) pthread_join(thread[i], NULL);
assert(n == NUM_THREADS*10000+1);
}
}
{
printf("__sync_sub_and_fetch ..\n");
T x = 5;
T y = __sync_sub_and_fetch(&x, 10);
assert(y == -5);
assert(x == -5);
volatile int n = 1;
if (emscripten_has_threading_support())
{
for (int i = 0; i < NUM_THREADS; ++i) pthread_create(&thread[i], NULL, thread_sub_and_fetch, (void*)&n);
for (int i = 0; i < NUM_THREADS; ++i) pthread_join(thread[i], NULL);
assert(n == 1-NUM_THREADS*10000);
}
}
{
printf("__sync_or_and_fetch ..\n");
T x = 5;
T y = __sync_or_and_fetch(&x, 9);
assert(y == 13);
assert(x == 13);
for (int x = 0; x < 100; ++x) // Test a few times for robustness, since this test is so short-lived.
{
or_and_fetch_data = (1<<NUM_THREADS);
if (emscripten_has_threading_support())
{
for (int i = 0; i < NUM_THREADS; ++i) pthread_create(&thread[i], NULL, thread_or_and_fetch, (void*)(1ll<<i));
for (int i = 0; i < NUM_THREADS; ++i) pthread_join(thread[i], NULL);
assert(or_and_fetch_data == (1<<(NUM_THREADS+1))-1);
}
}
}
{
printf("__sync_and_and_fetch ..\n");
T x = 5;
T y = __sync_and_and_fetch(&x, 9);
assert(y == 1);
assert(x == 1);
for (int x = 0; x < 100; ++x) // Test a few times for robustness, since this test is so short-lived.
{
and_and_fetch_data = (1<<(NUM_THREADS+1))-1;
if (emscripten_has_threading_support())
{
for (int i = 0; i < NUM_THREADS; ++i) pthread_create(&thread[i], NULL, thread_and_and_fetch, (void*)(~(1ll<<i)));
for (int i = 0; i < NUM_THREADS; ++i) pthread_join(thread[i], NULL);
assert(and_and_fetch_data == 1<<NUM_THREADS);
}
}
}
{
printf("__sync_xor_and_fetch ..\n");
T x = 5;
T y = __sync_xor_and_fetch(&x, 9);
assert(y == 12);
assert(x == 12);
for (int x = 0; x < 100; ++x) // Test a few times for robustness, since this test is so short-lived.
{
xor_and_fetch_data = 1<<NUM_THREADS;
if (emscripten_has_threading_support())
{
for (int i = 0; i < NUM_THREADS; ++i) pthread_create(&thread[i], NULL, thread_xor_and_fetch, (void*)(~(1ll<<i)));
for (int i = 0; i < NUM_THREADS; ++i) pthread_join(thread[i], NULL);
assert(xor_and_fetch_data == (1<<(NUM_THREADS+1))-1);
}
}
}
{
printf("__sync_nand_and_fetch ..\n");
T x = 5;
T y = __sync_nand_and_fetch(&x, 9);
assert(y == -2);
assert(x == -2);
const int oddNThreads = NUM_THREADS-1;
for (int x = 0; x < 100; ++x) // Test a few times for robustness, since this test is so short-lived.
{
nand_and_fetch_data = 0;
for (int i = 0; i < oddNThreads; ++i) pthread_create(&thread[i], NULL, thread_nand_and_fetch, (void*)-1);
for (int i = 0; i < oddNThreads; ++i) pthread_join(thread[i], NULL);
assert(nand_and_fetch_data == -1);
}
}
return 0;
}
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