6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
//===-- MainLoopPosix.h -----------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLDB_HOST_POSIX_MAINLOOPPOSIX_H
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#define LLDB_HOST_POSIX_MAINLOOPPOSIX_H
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#include "lldb/Host/Config.h"
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#include "lldb/Host/MainLoopBase.h"
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#include "lldb/Host/Pipe.h"
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#include "llvm/ADT/DenseMap.h"
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#include <atomic>
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#include <csignal>
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#include <list>
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#include <vector>
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namespace lldb_private {
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// Implementation of the MainLoopBase class. It can monitor file descriptors for
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// readability using ppoll, kqueue, or pselect. In addition to the common base,
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// this class provides the ability to invoke a given handler when a signal is
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// received.
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class MainLoopPosix : public MainLoopBase {
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private:
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class SignalHandle;
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public:
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typedef std::unique_ptr<SignalHandle> SignalHandleUP;
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MainLoopPosix();
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~MainLoopPosix() override;
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ReadHandleUP RegisterReadObject(const lldb::IOObjectSP &object_sp,
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const Callback &callback,
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Status &error) override;
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// Listening for signals from multiple MainLoop instances is perfectly safe
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// as long as they don't try to listen for the same signal. The callback
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// function is invoked when the control returns to the Run() function, not
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// when the hander is executed. This mean that you can treat the callback as
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// a normal function and perform things which would not be safe in a signal
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// handler. However, since the callback is not invoked synchronously, you
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// cannot use this mechanism to handle SIGSEGV and the like.
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SignalHandleUP RegisterSignal(int signo, const Callback &callback,
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Status &error);
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Status Run() override;
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protected:
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void UnregisterReadObject(IOObject::WaitableHandle handle) override;
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void UnregisterSignal(int signo, std::list<Callback>::iterator callback_it);
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void TriggerPendingCallbacks() override;
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private:
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void ProcessReadObject(IOObject::WaitableHandle handle);
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void ProcessSignal(int signo);
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class SignalHandle {
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public:
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~SignalHandle() { m_mainloop.UnregisterSignal(m_signo, m_callback_it); }
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private:
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SignalHandle(MainLoopPosix &mainloop, int signo,
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std::list<Callback>::iterator callback_it)
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: m_mainloop(mainloop), m_signo(signo), m_callback_it(callback_it) {}
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MainLoopPosix &m_mainloop;
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int m_signo;
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std::list<Callback>::iterator m_callback_it;
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friend class MainLoopPosix;
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SignalHandle(const SignalHandle &) = delete;
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const SignalHandle &operator=(const SignalHandle &) = delete;
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};
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struct SignalInfo {
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std::list<Callback> callbacks;
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struct sigaction old_action;
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bool was_blocked : 1;
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};
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class RunImpl;
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llvm::DenseMap<IOObject::WaitableHandle, Callback> m_read_fds;
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llvm::DenseMap<int, SignalInfo> m_signals;
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Pipe m_trigger_pipe;
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std::atomic<bool> m_triggering;
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#if HAVE_SYS_EVENT_H
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int m_kqueue;
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#endif
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};
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} // namespace lldb_private
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#endif // LLDB_HOST_POSIX_MAINLOOPPOSIX_H
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