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// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/message_loop/message_pump_io_ios.h"
namespace base {
MessagePumpIOSForIO::FileDescriptorWatcher::FileDescriptorWatcher()
: is_persistent_(false),
fdref_(NULL),
callback_types_(0),
fd_source_(NULL),
watcher_(NULL) {
}
MessagePumpIOSForIO::FileDescriptorWatcher::~FileDescriptorWatcher() {
StopWatchingFileDescriptor();
}
bool MessagePumpIOSForIO::FileDescriptorWatcher::StopWatchingFileDescriptor() {
if (fdref_ == NULL)
return true;
CFFileDescriptorDisableCallBacks(fdref_, callback_types_);
if (pump_)
pump_->RemoveRunLoopSource(fd_source_);
fd_source_.reset();
fdref_.reset();
callback_types_ = 0;
pump_.reset();
watcher_ = NULL;
return true;
}
void MessagePumpIOSForIO::FileDescriptorWatcher::Init(
CFFileDescriptorRef fdref,
CFOptionFlags callback_types,
CFRunLoopSourceRef fd_source,
bool is_persistent) {
DCHECK(fdref);
DCHECK(!fdref_);
is_persistent_ = is_persistent;
fdref_.reset(fdref);
callback_types_ = callback_types;
fd_source_.reset(fd_source);
}
void MessagePumpIOSForIO::FileDescriptorWatcher::OnFileCanReadWithoutBlocking(
int fd,
MessagePumpIOSForIO* pump) {
DCHECK(callback_types_ & kCFFileDescriptorReadCallBack);
pump->WillProcessIOEvent();
watcher_->OnFileCanReadWithoutBlocking(fd);
pump->DidProcessIOEvent();
}
void MessagePumpIOSForIO::FileDescriptorWatcher::OnFileCanWriteWithoutBlocking(
int fd,
MessagePumpIOSForIO* pump) {
DCHECK(callback_types_ & kCFFileDescriptorWriteCallBack);
pump->WillProcessIOEvent();
watcher_->OnFileCanWriteWithoutBlocking(fd);
pump->DidProcessIOEvent();
}
MessagePumpIOSForIO::MessagePumpIOSForIO() : weak_factory_(this) {
}
MessagePumpIOSForIO::~MessagePumpIOSForIO() {
}
bool MessagePumpIOSForIO::WatchFileDescriptor(
int fd,
bool persistent,
int mode,
FileDescriptorWatcher *controller,
Watcher *delegate) {
DCHECK_GE(fd, 0);
DCHECK(controller);
DCHECK(delegate);
DCHECK(mode == WATCH_READ || mode == WATCH_WRITE || mode == WATCH_READ_WRITE);
// WatchFileDescriptor should be called on the pump thread. It is not
// threadsafe, and your watcher may never be registered.
DCHECK(watch_file_descriptor_caller_checker_.CalledOnValidThread());
CFFileDescriptorContext source_context = {0};
source_context.info = controller;
CFOptionFlags callback_types = 0;
if (mode & WATCH_READ) {
callback_types |= kCFFileDescriptorReadCallBack;
}
if (mode & WATCH_WRITE) {
callback_types |= kCFFileDescriptorWriteCallBack;
}
CFFileDescriptorRef fdref = controller->fdref_;
if (fdref == NULL) {
base::ScopedCFTypeRef<CFFileDescriptorRef> scoped_fdref(
CFFileDescriptorCreate(
kCFAllocatorDefault, fd, false, HandleFdIOEvent, &source_context));
if (scoped_fdref == NULL) {
NOTREACHED() << "CFFileDescriptorCreate failed";
return false;
}
CFFileDescriptorEnableCallBacks(scoped_fdref, callback_types);
// TODO(wtc): what should the 'order' argument be?
base::ScopedCFTypeRef<CFRunLoopSourceRef> scoped_fd_source(
CFFileDescriptorCreateRunLoopSource(
kCFAllocatorDefault, scoped_fdref, 0));
if (scoped_fd_source == NULL) {
NOTREACHED() << "CFFileDescriptorCreateRunLoopSource failed";
return false;
}
CFRunLoopAddSource(run_loop(), scoped_fd_source, kCFRunLoopCommonModes);
// Transfer ownership of scoped_fdref and fd_source to controller.
controller->Init(scoped_fdref.release(), callback_types,
scoped_fd_source.release(), persistent);
} else {
// It's illegal to use this function to listen on 2 separate fds with the
// same |controller|.
if (CFFileDescriptorGetNativeDescriptor(fdref) != fd) {
NOTREACHED() << "FDs don't match: "
<< CFFileDescriptorGetNativeDescriptor(fdref)
<< " != " << fd;
return false;
}
if (persistent != controller->is_persistent_) {
NOTREACHED() << "persistent doesn't match";
return false;
}
// Combine old/new event masks.
CFFileDescriptorDisableCallBacks(fdref, controller->callback_types_);
controller->callback_types_ |= callback_types;
CFFileDescriptorEnableCallBacks(fdref, controller->callback_types_);
}
controller->set_watcher(delegate);
controller->set_pump(weak_factory_.GetWeakPtr());
return true;
}
void MessagePumpIOSForIO::RemoveRunLoopSource(CFRunLoopSourceRef source) {
CFRunLoopRemoveSource(run_loop(), source, kCFRunLoopCommonModes);
}
void MessagePumpIOSForIO::AddIOObserver(IOObserver *obs) {
io_observers_.AddObserver(obs);
}
void MessagePumpIOSForIO::RemoveIOObserver(IOObserver *obs) {
io_observers_.RemoveObserver(obs);
}
void MessagePumpIOSForIO::WillProcessIOEvent() {
FOR_EACH_OBSERVER(IOObserver, io_observers_, WillProcessIOEvent());
}
void MessagePumpIOSForIO::DidProcessIOEvent() {
FOR_EACH_OBSERVER(IOObserver, io_observers_, DidProcessIOEvent());
}
// static
void MessagePumpIOSForIO::HandleFdIOEvent(CFFileDescriptorRef fdref,
CFOptionFlags callback_types,
void* context) {
FileDescriptorWatcher* controller =
static_cast<FileDescriptorWatcher*>(context);
DCHECK_EQ(fdref, controller->fdref_);
// Ensure that |fdref| will remain live for the duration of this function
// call even if |controller| is deleted or |StopWatchingFileDescriptor()| is
// called, either of which will cause |fdref| to be released.
ScopedCFTypeRef<CFFileDescriptorRef> scoped_fdref(
fdref, base::scoped_policy::RETAIN);
int fd = CFFileDescriptorGetNativeDescriptor(fdref);
MessagePumpIOSForIO* pump = controller->pump().get();
DCHECK(pump);
if (callback_types & kCFFileDescriptorWriteCallBack)
controller->OnFileCanWriteWithoutBlocking(fd, pump);
// Perform the read callback only if the file descriptor has not been
// invalidated in the write callback. As |FileDescriptorWatcher| invalidates
// its file descriptor on destruction, the file descriptor being valid also
// guarantees that |controller| has not been deleted.
if (callback_types & kCFFileDescriptorReadCallBack &&
CFFileDescriptorIsValid(fdref)) {
DCHECK_EQ(fdref, controller->fdref_);
controller->OnFileCanReadWithoutBlocking(fd, pump);
}
// Re-enable callbacks after the read/write if the file descriptor is still
// valid and the controller is persistent.
if (CFFileDescriptorIsValid(fdref) && controller->is_persistent_) {
DCHECK_EQ(fdref, controller->fdref_);
CFFileDescriptorEnableCallBacks(fdref, callback_types);
}
}
} // namespace base
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