mirror of https://github.com/bitcoin/bitcoin
107 lines
2.7 KiB
C++
107 lines
2.7 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2022 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <shutdown.h>
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#if defined(HAVE_CONFIG_H)
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#include <config/bitcoin-config.h>
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#endif
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#include <logging.h>
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#include <node/interface_ui.h>
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#include <util/tokenpipe.h>
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#include <warnings.h>
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#include <assert.h>
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#include <atomic>
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#ifdef WIN32
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#include <condition_variable>
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#endif
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bool AbortNode(const std::string& strMessage, bilingual_str user_message)
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{
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SetMiscWarning(Untranslated(strMessage));
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LogPrintf("*** %s\n", strMessage);
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if (user_message.empty()) {
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user_message = _("A fatal internal error occurred, see debug.log for details");
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}
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AbortError(user_message);
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StartShutdown();
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return false;
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}
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static std::atomic<bool> fRequestShutdown(false);
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#ifdef WIN32
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/** On windows it is possible to simply use a condition variable. */
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std::mutex g_shutdown_mutex;
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std::condition_variable g_shutdown_cv;
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#else
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/** On UNIX-like operating systems use the self-pipe trick.
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*/
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static TokenPipeEnd g_shutdown_r;
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static TokenPipeEnd g_shutdown_w;
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#endif
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bool InitShutdownState()
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{
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#ifndef WIN32
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std::optional<TokenPipe> pipe = TokenPipe::Make();
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if (!pipe) return false;
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g_shutdown_r = pipe->TakeReadEnd();
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g_shutdown_w = pipe->TakeWriteEnd();
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#endif
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return true;
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}
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void StartShutdown()
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{
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#ifdef WIN32
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std::unique_lock<std::mutex> lk(g_shutdown_mutex);
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fRequestShutdown = true;
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g_shutdown_cv.notify_one();
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#else
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// This must be reentrant and safe for calling in a signal handler, so using a condition variable is not safe.
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// Make sure that the token is only written once even if multiple threads call this concurrently or in
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// case of a reentrant signal.
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if (!fRequestShutdown.exchange(true)) {
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// Write an arbitrary byte to the write end of the shutdown pipe.
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int res = g_shutdown_w.TokenWrite('x');
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if (res != 0) {
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LogPrintf("Sending shutdown token failed\n");
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assert(0);
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}
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}
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#endif
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}
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void AbortShutdown()
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{
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if (fRequestShutdown) {
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// Cancel existing shutdown by waiting for it, this will reset condition flags and remove
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// the shutdown token from the pipe.
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WaitForShutdown();
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}
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fRequestShutdown = false;
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}
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bool ShutdownRequested()
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{
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return fRequestShutdown;
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}
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void WaitForShutdown()
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{
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#ifdef WIN32
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std::unique_lock<std::mutex> lk(g_shutdown_mutex);
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g_shutdown_cv.wait(lk, [] { return fRequestShutdown.load(); });
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#else
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int res = g_shutdown_r.TokenRead();
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if (res != 'x') {
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LogPrintf("Reading shutdown token failed\n");
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assert(0);
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}
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#endif
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}
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