151 lines
4.6 KiB
C++
151 lines
4.6 KiB
C++
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __FDEVENT_H
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#define __FDEVENT_H
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#include <stddef.h>
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#include <stdint.h>
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#include <chrono>
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#include <deque>
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#include <functional>
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#include <mutex>
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#include <optional>
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#include <variant>
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#include <android-base/thread_annotations.h>
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#include "adb_unique_fd.h"
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// Events that may be observed
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#define FDE_READ 0x0001
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#define FDE_WRITE 0x0002
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#define FDE_ERROR 0x0004
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#define FDE_TIMEOUT 0x0008
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// Internal states.
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#define FDE_EVENTMASK 0x00ff
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#define FDE_STATEMASK 0xff00
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#define FDE_ACTIVE 0x0100
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#define FDE_PENDING 0x0200
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typedef void (*fd_func)(int fd, unsigned events, void *userdata);
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typedef void (*fd_func2)(struct fdevent* fde, unsigned events, void* userdata);
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struct fdevent;
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std::string dump_fde(const fdevent* fde);
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struct fdevent_context {
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public:
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virtual ~fdevent_context() = default;
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// Allocate and initialize a new fdevent object.
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fdevent* Create(unique_fd fd, std::variant<fd_func, fd_func2> func, void* arg);
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// Deallocate an fdevent object, returning the file descriptor that was owned by it.
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unique_fd Destroy(fdevent* fde);
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protected:
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// Register an fdevent that is being created by Create with the fdevent_context.
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virtual void Register(fdevent* fde) = 0;
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// Unregister an fdevent that is being destroyed by Destroy with the fdevent_context.
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virtual void Unregister(fdevent* fde) = 0;
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public:
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// Change which events should cause notifications.
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virtual void Set(fdevent* fde, unsigned events) = 0;
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void Add(fdevent* fde, unsigned events);
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void Del(fdevent* fde, unsigned events);
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// Set a timeout on an fdevent.
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// If no events are triggered by the timeout, an FDE_TIMEOUT will be generated.
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// Note timeouts are not defused automatically; if a timeout is set on an fdevent, it will
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// trigger repeatedly every |timeout| ms.
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void SetTimeout(fdevent* fde, std::optional<std::chrono::milliseconds> timeout);
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// Loop until TerminateLoop is called, handling events.
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// Implementations should call FlushRunQueue on every iteration, and check the value of
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// terminate_loop_ to determine whether to stop.
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virtual void Loop() = 0;
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// Assert that the caller is either running on the context's main thread, or that there is no
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// active main thread.
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void CheckMainThread();
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// Queue an operation to be run on the main thread.
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void Run(std::function<void()> fn);
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// Test-only functionality:
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void TerminateLoop();
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virtual size_t InstalledCount() = 0;
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protected:
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// Interrupt the run loop.
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virtual void Interrupt() = 0;
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// Run all pending functions enqueued via Run().
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void FlushRunQueue() EXCLUDES(run_queue_mutex_);
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std::optional<uint64_t> main_thread_id_ = std::nullopt;
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std::atomic<bool> terminate_loop_ = false;
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private:
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uint64_t fdevent_id_ = 0;
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std::mutex run_queue_mutex_;
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std::deque<std::function<void()>> run_queue_ GUARDED_BY(run_queue_mutex_);
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};
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struct fdevent {
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uint64_t id;
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unique_fd fd;
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int force_eof = 0;
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uint16_t state = 0;
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uint16_t events = 0;
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std::optional<std::chrono::milliseconds> timeout;
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std::chrono::steady_clock::time_point last_active;
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std::variant<fd_func, fd_func2> func;
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void* arg = nullptr;
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};
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// Backwards compatibility shims that forward to the global fdevent_context.
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fdevent* fdevent_create(int fd, fd_func func, void* arg);
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fdevent* fdevent_create(int fd, fd_func2 func, void* arg);
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unique_fd fdevent_release(fdevent* fde);
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void fdevent_destroy(fdevent* fde);
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void fdevent_set(fdevent *fde, unsigned events);
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void fdevent_add(fdevent *fde, unsigned events);
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void fdevent_del(fdevent *fde, unsigned events);
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void fdevent_set_timeout(fdevent* fde, std::optional<std::chrono::milliseconds> timeout);
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void fdevent_loop();
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void check_main_thread();
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// Queue an operation to run on the main thread.
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void fdevent_run_on_main_thread(std::function<void()> fn);
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// The following functions are used only for tests.
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void fdevent_terminate_loop();
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size_t fdevent_installed_count();
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void fdevent_reset();
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#endif
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