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/*
* Copyright (C) 2023 Amazon.com Inc. or its affiliates. All rights reserved.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*/
#ifndef __wasi__
#error This example only compiles to WASM/WASI target
#endif
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <stdbool.h>
#if USE_CUSTOM_SYNC_PRIMITIVES != 0
#include "sync_primitives.h"
#else
#include <pthread.h>
#endif
#include "wasi_thread_start.h"
enum CONSTANTS {
NUM_THREADS = 4,
NUM_ITER = 200,
SECOND = 1000 * 1000 * 1000, /* 1 second */
TIMEOUT = 10LL * SECOND
};
pthread_mutex_t mutex;
int g_count = 0;
typedef struct {
start_args_t base;
int th_done;
} shared_t;
void
__wasi_thread_start_C(int thread_id, int *start_arg)
{
shared_t *data = (shared_t *)start_arg;
for (int i = 0; i < NUM_ITER; i++) {
pthread_mutex_lock(&mutex);
g_count++;
pthread_mutex_unlock(&mutex);
}
__atomic_store_n(&data->th_done, 1, __ATOMIC_SEQ_CST);
__builtin_wasm_memory_atomic_notify(&data->th_done, 1);
}
int
main(int argc, char **argv)
{
shared_t data[NUM_THREADS] = { 0 };
int thread_ids[NUM_THREADS];
assert(pthread_mutex_init(&mutex, NULL) == 0 && "Failed to init mutex");
for (int i = 0; i < NUM_THREADS; i++) {
assert(start_args_init(&data[i].base));
thread_ids[i] = __wasi_thread_spawn(&data[i]);
assert(thread_ids[i] > 0 && "Thread creation failed");
}
printf("Wait for threads to finish\n");
for (int i = 0; i < NUM_THREADS; i++) {
if (__builtin_wasm_memory_atomic_wait32(&data[i].th_done, 0, TIMEOUT)
== 2) {
assert(false && "Wait should not time out");
}
start_args_deinit(&data[i].base);
}
printf("Value of count after update: %d\n", g_count);
assert(g_count == (NUM_THREADS * NUM_ITER)
&& "Global count not updated correctly");
assert(pthread_mutex_destroy(&mutex) == 0 && "Failed to destroy mutex");
return EXIT_SUCCESS;
}
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