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https://github.com/bytecodealliance/wasm-micro-runtime.git
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929d5942b9
For now this implementation uses thread manager. Not sure whether thread manager is needed in that case. In the future there'll be likely another syscall added (for pthread_exit) and for that we might need some kind of thread management - with that in mind, we keep thread manager for now and will refactor this later if needed.
62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
/*
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* Copyright (C) 2022 Amazon.com Inc. or its affiliates. All rights reserved.
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* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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*/
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#ifndef __wasi__
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#error This example only compiles to WASM/WASI target
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <assert.h>
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#include <wasi/api.h>
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static const int64_t SECOND = 1000 * 1000 * 1000;
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typedef struct {
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int th_ready;
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int value;
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int thread_id;
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} shared_t;
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__attribute__((export_name("wasi_thread_start"))) void
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wasi_thread_start(int thread_id, int *start_arg)
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{
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shared_t *data = (shared_t *)start_arg;
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printf("New thread ID: %d, starting parameter: %d\n", thread_id,
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data->value);
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data->thread_id = thread_id;
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data->value += 8;
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printf("Updated value: %d\n", data->value);
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data->th_ready = 1;
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__builtin_wasm_memory_atomic_notify(&data->th_ready, 1);
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}
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int
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main(int argc, char **argv)
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{
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shared_t data = { 0, 52, -1 };
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int thread_id;
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thread_id = __wasi_thread_spawn(&data);
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if (thread_id < 0) {
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printf("Failed to create thread: %d\n", thread_id);
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return EXIT_FAILURE;
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}
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if (__builtin_wasm_memory_atomic_wait32(&data.th_ready, 0, SECOND) == 2) {
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printf("Timeout\n");
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return EXIT_FAILURE;
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}
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printf("Thread completed, new value: %d, thread id: %d\n", data.value,
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data.thread_id);
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assert(thread_id == data.thread_id);
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return EXIT_SUCCESS;
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}
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