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#include <iostream>
#include <fstream>
#include <thread>
#include <mutex>
#include "wasm.hh"
const int N_THREADS = 10;
const int N_REPS = 3;
// A function to be called from Wasm code.
auto callback(
void* env, const wasm::Val args[], wasm::Val results[]
) -> wasm::own<wasm::Trap> {
assert(args[0].kind() == wasm::I32);
std::lock_guard<std::mutex>(*reinterpret_cast<std::mutex*>(env));
std::cout << "Thread " << args[0].i32() << " running..." << std::endl;
std::cout.flush();
return nullptr;
}
void run(
wasm::Engine* engine, const wasm::Shared<wasm::Module>* shared,
std::mutex* mutex, int id
) {
// Create store.
auto store_ = wasm::Store::make(engine);
auto store = store_.get();
// Obtain.
auto module = wasm::Module::obtain(store, shared);
if (!module) {
std::lock_guard<std::mutex> lock(*mutex);
std::cout << "> Error compiling module!" << std::endl;
exit(1);
}
// Run the example N times.
for (int i = 0; i < N_REPS; ++i) {
std::this_thread::sleep_for(std::chrono::nanoseconds(100000));
// Create imports.
auto func_type = wasm::FuncType::make(
wasm::ownvec<wasm::ValType>::make(wasm::ValType::make(wasm::I32)),
wasm::ownvec<wasm::ValType>::make()
);
auto func = wasm::Func::make(store, func_type.get(), callback, mutex);
auto global_type = wasm::GlobalType::make(
wasm::ValType::make(wasm::I32), wasm::CONST);
auto global = wasm::Global::make(
store, global_type.get(), wasm::Val::i32(i));
// Instantiate.
wasm::Extern* imports[] = {func.get(), global.get()};
auto instance = wasm::Instance::make(store, module.get(), imports);
if (!instance) {
std::lock_guard<std::mutex> lock(*mutex);
std::cout << "> Error instantiating module!" << std::endl;
exit(1);
}
// Extract export.
auto exports = instance->exports();
if (exports.size() == 0 || exports[0]->kind() != wasm::EXTERN_FUNC || !exports[0]->func()) {
std::lock_guard<std::mutex> lock(*mutex);
std::cout << "> Error accessing export!" << std::endl;
exit(1);
}
auto run_func = exports[0]->func();
// Call.
run_func->call();
}
}
int main(int argc, const char *argv[]) {
// Initialize.
std::cout << "Initializing..." << std::endl;
auto engine = wasm::Engine::make();
// Load binary.
std::cout << "Loading binary..." << std::endl;
std::ifstream file("threads.wasm");
file.seekg(0, std::ios_base::end);
auto file_size = file.tellg();
file.seekg(0);
auto binary = wasm::vec<byte_t>::make_uninitialized(file_size);
file.read(binary.get(), file_size);
file.close();
if (file.fail()) {
std::cout << "> Error loading module!" << std::endl;
return 1;
}
// Compile and share.
std::cout << "Compiling and sharing module..." << std::endl;
auto store = wasm::Store::make(engine.get());
auto module = wasm::Module::make(store.get(), binary);
auto shared = module->share();
// Spawn threads.
std::cout << "Spawning threads..." << std::endl;
std::mutex mutex;
std::thread threads[N_THREADS];
for (int i = 0; i < N_THREADS; ++i) {
{
std::lock_guard<std::mutex> lock(mutex);
std::cout << "Initializing thread " << i << "..." << std::endl;
}
threads[i] = std::thread(run, engine.get(), shared.get(), &mutex, i);
}
for (int i = 0; i < N_THREADS; ++i) {
{
std::lock_guard<std::mutex> lock(mutex);
std::cout << "Waiting for thread " << i << "..." << std::endl;
}
threads[i].join();
}
return 0;
}
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