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211 lines (171 loc) · 5.59 KB
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/*
Example of instantiating of the WebAssembly module and invoking its exported
function in a separate thread.
You can compile and run this example on Linux with:
cargo build --release -p wasmtime-c-api
cc examples/threads.c \
-I crates/c-api/include \
-I crates/c-api/wasm-c-api/include \
target/release/libwasmtime.a \
-lpthread -ldl -lm \
-o threads
./threads
Note that on Windows and macOS the command will be similar, but you'll need
to tweak the `-lpthread` and such annotations as well as the name of the
`libwasmtime.a` file on Windows.
You can also build using cmake:
mkdir build && cd build && cmake .. && cmake --build . --target wasmtime-threads
*/
#ifndef _WIN32
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
#include <wasm.h>
#include <wasmtime.h>
#define own
static void exit_with_error(const char *message, wasmtime_error_t *error, wasm_trap_t *trap);
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 = {.kind = WASM_I32, .of = {.i32 = (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* imports[] = {
wasm_func_as_extern(func), wasm_global_as_extern(global),
};
wasm_extern_vec_t imports_vec = WASM_ARRAY_VEC(imports);
own wasm_instance_t* instance =
wasm_instance_new(store, module, &imports_vec, 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 args_vec = WASM_EMPTY_VEC;
wasm_val_vec_t results_vec = WASM_EMPTY_VEC;
if (wasm_func_call(run_func, &args_vec, &results_vec)) {
printf("> Error calling function!\n");
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 our input file to parse it next
FILE* file = fopen("examples/threads.wat", "r");
if (!file) {
printf("> Error loading file!\n");
return 1;
}
fseek(file, 0L, SEEK_END);
size_t file_size = ftell(file);
fseek(file, 0L, SEEK_SET);
wasm_byte_vec_t wat;
wasm_byte_vec_new_uninitialized(&wat, file_size);
if (fread(wat.data, file_size, 1, file) != 1) {
printf("> Error loading module!\n");
return 1;
}
fclose(file);
// Parse the wat into the binary wasm format
wasm_byte_vec_t binary;
wasmtime_error_t *error = wasmtime_wat2wasm(wat.data, wat.size, &binary);
if (error != NULL)
exit_with_error("failed to parse wat", error, NULL);
wasm_byte_vec_delete(&wat);
// 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;
}
static void exit_with_error(const char *message, wasmtime_error_t *error, wasm_trap_t *trap) {
fprintf(stderr, "error: %s\n", message);
wasm_byte_vec_t error_message;
if (error != NULL) {
wasmtime_error_message(error, &error_message);
} else {
wasm_trap_message(trap, &error_message);
}
fprintf(stderr, "%.*s\n", (int) error_message.size, error_message.data);
wasm_byte_vec_delete(&error_message);
exit(1);
}
#else
// TODO implement example for Windows
int main(int argc, const char *argv[]) {
return 0;
}
#endif // _WIN32