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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_fetch_and_op().
// See https://gcc.gnu.org/onlinedocs/gcc-4.6.4/gcc/Atomic-Builtins.html
#define NUM_THREADS 8
#define T int
void *thread_fetch_and_add(void *arg) {
for (int i = 0; i < 10000; ++i) {
__sync_fetch_and_add((int*)arg, 1);
}
pthread_exit(0);
}
void *thread_fetch_and_sub(void *arg) {
for (int i = 0; i < 10000; ++i) {
__sync_fetch_and_sub((int*)arg, 1);
}
pthread_exit(0);
}
volatile long fetch_and_or_data = 0;
void *thread_fetch_and_or(void *arg) {
for (int i = 0; i < 10000; ++i) {
__sync_fetch_and_or(&fetch_and_or_data, (long)arg);
}
pthread_exit(0);
}
volatile long fetch_and_and_data = 0;
void *thread_fetch_and_and(void *arg) {
for (int i = 0; i < 10000; ++i) {
__sync_fetch_and_and(&fetch_and_and_data, (long)arg);
}
pthread_exit(0);
}
volatile long fetch_and_xor_data = 0;
void *thread_fetch_and_xor(void *arg) {
for (int i = 0; i < 9999; ++i) { // Odd number of times so that the operation doesn't cancel itself out.
__sync_fetch_and_xor(&fetch_and_xor_data, (long)arg);
}
pthread_exit(0);
}
// XXX NAND support does not exist in Atomics API.
volatile long fetch_and_nand_data = 0;
void *thread_fetch_and_nand(void *arg) {
for (int i = 0; i < 9999; ++i) { // Odd number of times so that the operation doesn't cancel itself out.
__sync_fetch_and_nand(&fetch_and_nand_data, (long)arg);
}
pthread_exit(0);
}
int main() {
pthread_t thread[NUM_THREADS];
{
printf("__sync_fetch_and_add ..\n");
T x = 5;
T y = __sync_fetch_and_add(&x, 10);
assert(y == 5);
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_fetch_and_add, (void*)&n);
for (int i = 0; i < NUM_THREADS; ++i) pthread_join(thread[i], NULL);
assert(n == NUM_THREADS*10000+1);
}
}
{
printf("__sync_fetch_and_sub ..\n");
T x = 5;
T y = __sync_fetch_and_sub(&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_fetch_and_sub, (void*)&n);
for (int i = 0; i < NUM_THREADS; ++i) pthread_join(thread[i], NULL);
assert(n == 1-NUM_THREADS*10000);
}
}
{
printf("__sync_fetch_and_or ..\n");
T x = 5;
T y = __sync_fetch_and_or(&x, 9);
assert(y == 5);
assert(x == 13);
for (int x = 0; x < 100; ++x) { // Test a few times for robustness, since this test is so short-lived.
fetch_and_or_data = (1<<NUM_THREADS);
if (emscripten_has_threading_support()) {
for (int i = 0; i < NUM_THREADS; ++i) pthread_create(&thread[i], NULL, thread_fetch_and_or, (void*)(1ll<<i));
for (int i = 0; i < NUM_THREADS; ++i) pthread_join(thread[i], NULL);
assert(fetch_and_or_data == (1<<(NUM_THREADS+1))-1);
}
}
}
{
printf("__sync_fetch_and_and ..\n");
T x = 5;
T y = __sync_fetch_and_and(&x, 9);
assert(y == 5);
assert(x == 1);
for (int x = 0; x < 100; ++x) { // Test a few times for robustness, since this test is so short-lived.
fetch_and_and_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_fetch_and_and, (void*)(~(1ll<<i)));
for (int i = 0; i < NUM_THREADS; ++i) pthread_join(thread[i], NULL);
assert(fetch_and_and_data == 1<<NUM_THREADS);
}
}
}
{
printf("__sync_fetch_and_xor ..\n");
T x = 5;
T y = __sync_fetch_and_xor(&x, 9);
assert(y == 5);
assert(x == 12);
for (int x = 0; x < 100; ++x) { // Test a few times for robustness, since this test is so short-lived.
fetch_and_xor_data = 1<<NUM_THREADS;
if (emscripten_has_threading_support()) {
for (int i = 0; i < NUM_THREADS; ++i) pthread_create(&thread[i], NULL, thread_fetch_and_xor, (void*)(~(1ll<<i)));
for (int i = 0; i < NUM_THREADS; ++i) pthread_join(thread[i], NULL);
assert(fetch_and_xor_data == (1<<(NUM_THREADS+1))-1);
}
}
}
{
printf("__sync_fetch_and_nand ..\n");
T x = 5;
T y = __sync_fetch_and_nand(&x, 9);
assert(y == 5);
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.
fetch_and_nand_data = 0;
for (int i = 0; i < oddNThreads; ++i) pthread_create(&thread[i], NULL, thread_fetch_and_nand, (void*)-1);
for (int i = 0; i < oddNThreads; ++i) pthread_join(thread[i], NULL);
assert(fetch_and_nand_data == -1);
}
}
// Test that regex replacing also works on these.
emscripten_atomic_fence();
__sync_synchronize();
return 0;
}
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