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0ba6627d5c
as in main(), we use `stop_signal` to handle SIGINT and SIGTERM, so when scylla receives a SIGTERM, the corresponding signal handler could get called on any threads created by this program. so there is chance that the alien_runner thread could be choosen to run the signal handler setup by `main()`, but that signal handler assumes the availability of Seastar reactor. unfortunately, we don't have a Seastar reactor in alien thread. the same applies to Seastar's `thread_pool` which handles the slow and blocking POSIX calls typically used for interacting with files. so, in this change, we use the same approach as Seastar's `thread_pool::work()` -- just block all signals, so the alien threads used by wasm for compiling UDF won't handle the signals using the handlers planted by `main()`. Fixes #13228 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes #13233
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/*
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* Copyright (C) 2023-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#include <exception>
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#include <seastar/core/alien.hh>
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#include <seastar/core/posix.hh>
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#include <seastar/core/reactor.hh>
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#include "lang/wasm.hh"
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#include "lang/wasm_alien_thread_runner.hh"
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#include "seastar/core/posix.hh"
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namespace wasm {
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std::optional<wasm_compile_task> task_queue::pop_front() {
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std::unique_lock lock(_mut);
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_cv.wait(lock, [this] { return !_pending.empty(); });
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auto work_item = std::move(_pending.front());
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_pending.pop();
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return work_item;
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}
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void task_queue::push_back(std::optional<wasm_compile_task> work_item) {
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std::unique_lock lock(_mut);
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_pending.emplace(std::move(work_item));
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lock.unlock();
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_cv.notify_one();
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}
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alien_thread_runner::alien_thread_runner()
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: _thread([this] {
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sigset_t mask;
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sigfillset(&mask);
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auto r = ::pthread_sigmask(SIG_BLOCK, &mask, nullptr);
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throw_pthread_error(r);
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for (;;) {
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auto work_item = _pending_queue.pop_front();
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if (work_item) {
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work_item->func();
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} else {
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break;
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}
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}
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})
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{ }
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alien_thread_runner::~alien_thread_runner() {
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_pending_queue.push_back(std::nullopt);
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_thread.join();
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}
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void alien_thread_runner::submit(seastar::promise<rust::Box<wasmtime::Module>>& p, std::function<rust::Box<wasmtime::Module>()> f) {
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seastar::noncopyable_function<void()> packaged([f = std::move(f), &p, &alien = seastar::engine().alien(), shard = seastar::this_shard_id()] () mutable {
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try {
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rust::Box<wasmtime::Module> mod = f();
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seastar::alien::run_on(alien, shard, [&p, mod = std::move(mod)] () mutable {
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p.set_value(std::move(mod));
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});
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} catch (...) {
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seastar::alien::run_on(alien, shard, [&, eptr = std::current_exception()] {
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p.set_exception(wasm::exception(format("Compilation failed: {}", eptr)));
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});
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}
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});
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_pending_queue.push_back(wasm_compile_task{.func = std::move(packaged), .done = p, .shard = seastar::this_shard_id()});
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}
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} // namespace wasm
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