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#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
#include "wasm_c_api.h"
#define own
const int N_THREADS = 10;
const int N_REPS = 3;
// A function to be called from Wasm code.
own wasm_trap_t *
callback(const wasm_val_vec_t *args, wasm_val_vec_t *results)
{
assert(args->data[0].kind == WASM_I32);
printf("> Thread %d running\n", args->data[0].of.i32);
return NULL;
}
typedef struct {
wasm_engine_t *engine;
wasm_shared_module_t *module;
int id;
} thread_args;
void *
run(void *args_abs)
{
thread_args *args = (thread_args *)args_abs;
// Rereate store and module.
own wasm_store_t *store = wasm_store_new(args->engine);
own wasm_module_t *module = wasm_module_obtain(store, args->module);
// Run the example N times.
for (int i = 0; i < N_REPS; ++i) {
usleep(100000);
// Create imports.
own wasm_functype_t *func_type =
wasm_functype_new_1_0(wasm_valtype_new_i32());
own wasm_func_t *func = wasm_func_new(store, func_type, callback);
wasm_functype_delete(func_type);
wasm_val_t val = WASM_I32_VAL((int32_t)args->id);
own wasm_globaltype_t *global_type =
wasm_globaltype_new(wasm_valtype_new_i32(), WASM_CONST);
own wasm_global_t *global = wasm_global_new(store, global_type, &val);
wasm_globaltype_delete(global_type);
// Instantiate.
wasm_extern_t *externs[] = {
wasm_func_as_extern(func),
wasm_global_as_extern(global),
};
wasm_extern_vec_t imports = WASM_ARRAY_VEC(externs);
own wasm_instance_t *instance =
wasm_instance_new(store, module, &imports, NULL);
if (!instance) {
printf("> Error instantiating module!\n");
return NULL;
}
wasm_func_delete(func);
wasm_global_delete(global);
// Extract export.
own wasm_extern_vec_t exports;
wasm_instance_exports(instance, &exports);
if (exports.size == 0) {
printf("> Error accessing exports!\n");
return NULL;
}
const wasm_func_t *run_func = wasm_extern_as_func(exports.data[0]);
if (run_func == NULL) {
printf("> Error accessing export!\n");
return NULL;
}
wasm_instance_delete(instance);
// Call.
wasm_val_vec_t empty = WASM_EMPTY_VEC;
wasm_trap_t *trap = wasm_func_call(run_func, &empty, &empty);
if (trap) {
printf("> Error calling function!\n");
wasm_trap_delete(trap);
return NULL;
}
wasm_extern_vec_delete(&exports);
}
wasm_module_delete(module);
wasm_store_delete(store);
free(args_abs);
return NULL;
}
int
main(int argc, const char *argv[])
{
// Initialize.
wasm_engine_t *engine = wasm_engine_new();
// Load binary.
#if WASM_ENABLE_AOT != 0 && WASM_ENABLE_INTERP == 0
FILE *file = fopen("threads.aot", "rb");
#else
FILE *file = fopen("threads.wasm", "rb");
#endif
if (!file) {
printf("> Error loading module!\n");
return 1;
}
int ret = fseek(file, 0L, SEEK_END);
if (ret == -1) {
printf("> Error loading module!\n");
fclose(file);
return 1;
}
long file_size = ftell(file);
if (file_size == -1) {
printf("> Error loading module!\n");
fclose(file);
return 1;
}
ret = fseek(file, 0L, SEEK_SET);
if (ret == -1) {
printf("> Error loading module!\n");
fclose(file);
return 1;
}
wasm_byte_vec_t binary;
wasm_byte_vec_new_uninitialized(&binary, file_size);
if (fread(binary.data, file_size, 1, file) != 1) {
printf("> Error loading module!\n");
return 1;
}
fclose(file);
// Compile and share.
own wasm_store_t *store = wasm_store_new(engine);
own wasm_module_t *module = wasm_module_new(store, &binary);
if (!module) {
printf("> Error compiling module!\n");
return 1;
}
wasm_byte_vec_delete(&binary);
own wasm_shared_module_t *shared = wasm_module_share(module);
wasm_module_delete(module);
wasm_store_delete(store);
// Spawn threads.
pthread_t threads[N_THREADS];
for (int i = 0; i < N_THREADS; i++) {
thread_args *args = malloc(sizeof(thread_args));
args->id = i;
args->engine = engine;
args->module = shared;
printf("Initializing thread %d...\n", i);
pthread_create(&threads[i], NULL, &run, args);
}
for (int i = 0; i < N_THREADS; i++) {
printf("Waiting for thread: %d\n", i);
pthread_join(threads[i], NULL);
}
wasm_shared_module_delete(shared);
wasm_engine_delete(engine);
return 0;
}
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