blob: 1f14ffbc5d107a3718c7100c3e15d8132e509782 [file] [log] [blame]
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "platform/globals.h"
#if defined(DART_HOST_OS_FUCHSIA)
#include "bin/eventhandler.h"
#include "bin/eventhandler_fuchsia.h"
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <unistd.h>
#include <zircon/status.h>
#include <zircon/syscalls.h>
#include <zircon/syscalls/object.h>
#include <zircon/syscalls/port.h>
#include "bin/fdutils.h"
#include "bin/lockers.h"
#include "bin/socket.h"
#include "bin/thread.h"
#include "bin/utils.h"
#include "platform/hashmap.h"
#include "platform/syslog.h"
#include "platform/utils.h"
// The EventHandler for Fuchsia uses its "ports v2" API:
// https://fuchsia.googlesource.com/fuchsia/+/HEAD/zircon/docs/syscalls/port_create.md
// This API does not have epoll()-like edge triggering (EPOLLET). Since clients
// of the EventHandler expect edge-triggered notifications, we must simulate it.
// When a packet from zx_port_wait() indicates that a signal is asserted for a
// handle, we unsubscribe from that signal until the event that asserted the
// signal can be processed. For example:
//
// 1. We get ZX_SOCKET_WRITABLE from zx_port_wait() for a handle.
// 2. We send kOutEvent to the Dart thread.
// 3. We unsubscribe from further ZX_SOCKET_WRITABLE signals for the handle.
// 4. Some time later the Dart thread actually does a write().
// 5. After writing, the Dart thread resubscribes to write events.
//
// We use the same procedure for ZX_SOCKET_READABLE, and read()/accept().
// define EVENTHANDLER_LOG_ERROR to get log messages only for errors.
// define EVENTHANDLER_LOG_INFO to get log messages for both information and
// errors.
// #define EVENTHANDLER_LOG_INFO 1
#define EVENTHANDLER_LOG_ERROR 1
#if defined(EVENTHANDLER_LOG_INFO) || defined(EVENTHANDLER_LOG_ERROR)
#define LOG_ERR(msg, ...) \
{ \
int err = errno; \
Syslog::PrintErr("Dart EventHandler ERROR: %s:%d: " msg, __FILE__, \
__LINE__, ##__VA_ARGS__); \
errno = err; \
}
#if defined(EVENTHANDLER_LOG_INFO)
#define LOG_INFO(msg, ...) \
Syslog::Print("Dart EventHandler INFO: %s:%d: " msg, __FILE__, __LINE__, \
##__VA_ARGS__)
#else
#define LOG_INFO(msg, ...)
#endif // defined(EVENTHANDLER_LOG_INFO)
#else
#define LOG_ERR(msg, ...)
#define LOG_INFO(msg, ...)
#endif // defined(EVENTHANDLER_LOG_INFO) || defined(EVENTHANDLER_LOG_ERROR)
namespace dart {
namespace bin {
intptr_t IOHandle::Read(void* buffer, intptr_t num_bytes) {
MutexLocker ml(&mutex_);
const ssize_t read_bytes = NO_RETRY_EXPECTED(read(fd_, buffer, num_bytes));
const int err = errno;
LOG_INFO("IOHandle::Read: fd = %ld. read %ld bytes\n", fd_, read_bytes);
// Track the number of bytes available to read.
if (read_bytes > 0) {
available_bytes_ -=
(available_bytes_ >= read_bytes) ? read_bytes : available_bytes_;
}
// If we have read all available bytes, or if there was an error, then
// re-enable read events. We re-enable read events even if read() returns
// an error. The error might be, e.g. EWOULDBLOCK, in which case
// resubscription is necessary. Logic in the caller decides which errors
// are real, and which are ignore-and-continue.
if ((available_bytes_ == 0) || (read_bytes < 0)) {
// Resubscribe to read events.
read_events_enabled_ = true;
if (!AsyncWaitLocked(ZX_HANDLE_INVALID, POLLIN, wait_key_)) {
LOG_ERR("IOHandle::AsyncWait failed for fd = %ld\n", fd_);
}
}
errno = err;
return read_bytes;
}
intptr_t IOHandle::Write(const void* buffer, intptr_t num_bytes) {
MutexLocker ml(&mutex_);
const ssize_t written_bytes =
NO_RETRY_EXPECTED(write(fd_, buffer, num_bytes));
const int err = errno;
LOG_INFO("IOHandle::Write: fd = %ld. wrote %ld bytes\n", fd_, written_bytes);
// Resubscribe to write events.
write_events_enabled_ = true;
if (!AsyncWaitLocked(ZX_HANDLE_INVALID, POLLOUT, wait_key_)) {
LOG_ERR("IOHandle::AsyncWait failed for fd = %ld\n", fd_);
}
errno = err;
return written_bytes;
}
intptr_t IOHandle::Accept(struct sockaddr* addr, socklen_t* addrlen) {
MutexLocker ml(&mutex_);
const intptr_t socket = NO_RETRY_EXPECTED(accept(fd_, addr, addrlen));
const int err = errno;
LOG_INFO("IOHandle::Accept: fd = %ld. socket = %ld\n", fd_, socket);
// Re-subscribe to read events.
read_events_enabled_ = true;
if (!AsyncWaitLocked(ZX_HANDLE_INVALID, POLLIN, wait_key_)) {
LOG_ERR("IOHandle::AsyncWait failed for fd = %ld\n", fd_);
}
errno = err;
return socket;
}
intptr_t IOHandle::AvailableBytes() {
MutexLocker ml(&mutex_);
ASSERT(fd_ >= 0);
intptr_t available = FDUtils::AvailableBytes(fd_);
LOG_INFO("IOHandle::AvailableBytes(): fd = %ld, bytes = %ld\n", fd_,
available);
if (available < 0) {
// If there is an error, we set available to 1 to trigger a read event that
// then propagates the error.
available = 1;
}
available_bytes_ = available;
return available;
}
void IOHandle::Close() {
MutexLocker ml(&mutex_);
VOID_NO_RETRY_EXPECTED(close(fd_));
}
uint32_t IOHandle::MaskToEpollEvents(intptr_t mask) {
MutexLocker ml(&mutex_);
// Do not ask for POLLERR and POLLHUP explicitly as they are
// triggered anyway.
uint32_t events = 0;
// Do not subscribe to read closed events when kCloseEvent has already been
// sent to the Dart thread.
if (close_events_enabled_) {
events |= POLLRDHUP;
}
if (read_events_enabled_ && ((mask & (1 << kInEvent)) != 0)) {
events |= POLLIN;
}
if (write_events_enabled_ && ((mask & (1 << kOutEvent)) != 0)) {
events |= POLLOUT;
}
return events;
}
intptr_t IOHandle::EpollEventsToMask(intptr_t events) {
if ((events & POLLERR) != 0) {
// Return error only if POLLIN is present.
return ((events & POLLIN) != 0) ? (1 << kErrorEvent) : 0;
}
intptr_t event_mask = 0;
if ((events & POLLIN) != 0) {
event_mask |= (1 << kInEvent);
}
if ((events & POLLOUT) != 0) {
event_mask |= (1 << kOutEvent);
}
if ((events & (POLLHUP | POLLRDHUP)) != 0) {
event_mask |= (1 << kCloseEvent);
}
return event_mask;
}
bool IOHandle::AsyncWaitLocked(zx_handle_t port,
uint32_t events,
uint64_t key) {
LOG_INFO("IOHandle::AsyncWait: fd = %ld\n", fd_);
// The call to fdio_unsafe_fd_to_io() in the DescriptorInfo constructor may
// have returned NULL. If it did, propagate the problem up to Dart.
if (fdio_ == NULL) {
LOG_ERR("fdio_unsafe_fd_to_io(%ld) returned NULL\n", fd_);
return false;
}
zx_handle_t handle;
zx_signals_t signals;
fdio_unsafe_wait_begin(fdio_, events, &handle, &signals);
if (handle == ZX_HANDLE_INVALID) {
LOG_ERR("fd = %ld fdio_unsafe_wait_begin returned an invalid handle\n",
fd_);
return false;
}
// Remember the port. Use the remembered port if the argument "port" is
// ZX_HANDLE_INVALID.
ASSERT((port != ZX_HANDLE_INVALID) || (port_ != ZX_HANDLE_INVALID));
if ((port_ == ZX_HANDLE_INVALID) || (port != ZX_HANDLE_INVALID)) {
port_ = port;
}
handle_ = handle;
wait_key_ = key;
LOG_INFO("zx_object_wait_async(fd = %ld, signals = %x)\n", fd_, signals);
zx_status_t status =
zx_object_wait_async(handle_, port_, key, signals, ZX_WAIT_ASYNC_ONCE);
if (status != ZX_OK) {
LOG_ERR("zx_object_wait_async failed: %s\n", zx_status_get_string(status));
return false;
}
return true;
}
bool IOHandle::AsyncWait(zx_handle_t port, uint32_t events, uint64_t key) {
MutexLocker ml(&mutex_);
return AsyncWaitLocked(port, events, key);
}
void IOHandle::CancelWait(zx_handle_t port, uint64_t key) {
MutexLocker ml(&mutex_);
LOG_INFO("IOHandle::CancelWait: fd = %ld\n", fd_);
ASSERT(port != ZX_HANDLE_INVALID);
ASSERT(handle_ != ZX_HANDLE_INVALID);
zx_status_t status = zx_port_cancel(port, handle_, key);
if ((status != ZX_OK) && (status != ZX_ERR_NOT_FOUND)) {
LOG_ERR("zx_port_cancel failed: %s\n", zx_status_get_string(status));
}
}
uint32_t IOHandle::WaitEnd(zx_signals_t observed) {
MutexLocker ml(&mutex_);
uint32_t events = 0;
fdio_unsafe_wait_end(fdio_, observed, &events);
LOG_INFO("IOHandle::WaitEnd: fd = %ld, events = %x\n", fd_, events);
return events;
}
// This function controls the simulation of edge-triggering. It is responsible
// for removing events from the event mask when they should be supressed, and
// for supressing future events. Events are unsupressed by their respective
// operations by the Dart thread on the socket---that is, where the
// *_events_enabled_ flags are set to true.
intptr_t IOHandle::ToggleEvents(intptr_t event_mask) {
MutexLocker ml(&mutex_);
// If write events are disabled, then remove the kOutEvent bit from the
// event mask.
if (!write_events_enabled_) {
LOG_INFO(
"IOHandle::ToggleEvents: fd = %ld "
"de-asserting kOutEvent\n",
fd_);
event_mask = event_mask & ~(1 << kOutEvent);
}
// If the kOutEvent bit is set, then supress future write events until the
// Dart thread writes.
if ((event_mask & (1 << kOutEvent)) != 0) {
LOG_INFO(
"IOHandle::ToggleEvents: fd = %ld "
"asserting kOutEvent and disabling\n",
fd_);
write_events_enabled_ = false;
}
// If read events are disabled, then remove the kInEvent bit from the event
// mask.
if (!read_events_enabled_) {
LOG_INFO(
"IOHandle::ToggleEvents: fd = %ld "
"de-asserting kInEvent\n",
fd_);
event_mask = event_mask & ~(1 << kInEvent);
}
// We may get In events without available bytes, so we must make sure there
// are actually bytes, or we will never resubscribe (due to a short-circuit
// on the Dart side).
//
// This happens due to how packets get enqueued on the port with all signals
// asserted at that time. Sometimes we enqueue a packet due to
// zx_object_wait_async e.g. for POLLOUT (writability) while the socket is
// readable and while we have a Read queued up on the Dart side. This packet
// will also have POLLIN (readable) asserted. We may then perform the Read
// and drain the socket before our zx_port_wait is serviced, at which point
// when we process the packet for POLLOUT with its stale POLLIN (readable)
// signal, the socket is no longer actually readable.
//
// As a detail, negative available bytes (errors) are handled specially; see
// IOHandle::AvailableBytes for more information.
if ((event_mask & (1 << kInEvent)) != 0) {
if (FDUtils::AvailableBytes(fd_) != 0) {
LOG_INFO(
"IOHandle::ToggleEvents: fd = %ld "
"asserting kInEvent and disabling with bytes available\n",
fd_);
read_events_enabled_ = false;
}
// Also supress future read events if we get a kCloseEvent. This is to
// account for POLLIN being set by Fuchsia when the socket is read-closed.
if ((event_mask & (1 << kCloseEvent)) != 0) {
LOG_INFO(
"IOHandle::ToggleEvents: fd = %ld "
"asserting kInEvent and disabling due to a close event\n",
fd_);
read_events_enabled_ = false;
}
}
// If the close events are disabled, then remove the kCloseEvent bit from the
// event mask.
if (!close_events_enabled_) {
LOG_INFO(
"IOHandle::ToggleEvents: fd = %ld "
"de-asserting kCloseEvent\n",
fd_);
event_mask = event_mask & ~(1 << kCloseEvent);
}
// If the kCloseEvent bit is set, then supress future close events, they will
// be ignored by the Dart thread. See _NativeSocket.multiplex in
// socket_patch.dart.
if ((event_mask & (1 << kCloseEvent)) != 0) {
LOG_INFO(
"IOHandle::ToggleEvents: fd = %ld "
"asserting kCloseEvent and disabling\n",
fd_);
close_events_enabled_ = false;
}
return event_mask;
}
void EventHandlerImplementation::AddToPort(zx_handle_t port_handle,
DescriptorInfo* di) {
const uint32_t events = di->io_handle()->MaskToEpollEvents(di->Mask());
const uint64_t key = reinterpret_cast<uint64_t>(di);
if (!di->io_handle()->AsyncWait(port_handle, events, key)) {
di->NotifyAllDartPorts(1 << kCloseEvent);
}
}
void EventHandlerImplementation::RemoveFromPort(zx_handle_t port_handle,
DescriptorInfo* di) {
const uint64_t key = reinterpret_cast<uint64_t>(di);
di->io_handle()->CancelWait(port_handle, key);
}
EventHandlerImplementation::EventHandlerImplementation()
: socket_map_(&SimpleHashMap::SamePointerValue, 16) {
shutdown_ = false;
// Create the port.
port_handle_ = ZX_HANDLE_INVALID;
zx_status_t status = zx_port_create(0, &port_handle_);
if (status != ZX_OK) {
// This is a FATAL because the VM won't work at all if we can't create this
// port.
FATAL1("zx_port_create failed: %s\n", zx_status_get_string(status));
}
ASSERT(port_handle_ != ZX_HANDLE_INVALID);
}
static void DeleteDescriptorInfo(void* info) {
DescriptorInfo* di = reinterpret_cast<DescriptorInfo*>(info);
LOG_INFO("Closed %ld\n", di->io_handle()->fd());
di->Close();
delete di;
}
EventHandlerImplementation::~EventHandlerImplementation() {
socket_map_.Clear(DeleteDescriptorInfo);
zx_handle_close(port_handle_);
port_handle_ = ZX_HANDLE_INVALID;
}
void EventHandlerImplementation::UpdatePort(intptr_t old_mask,
DescriptorInfo* di) {
const intptr_t new_mask = di->Mask();
if ((old_mask != 0) && (new_mask == 0)) {
RemoveFromPort(port_handle_, di);
} else if ((old_mask == 0) && (new_mask != 0)) {
AddToPort(port_handle_, di);
} else if ((old_mask != 0) && (new_mask != 0)) {
ASSERT((old_mask == new_mask) || !di->IsListeningSocket());
RemoveFromPort(port_handle_, di);
AddToPort(port_handle_, di);
}
}
DescriptorInfo* EventHandlerImplementation::GetDescriptorInfo(
intptr_t fd,
bool is_listening) {
IOHandle* handle = reinterpret_cast<IOHandle*>(fd);
ASSERT(handle->fd() >= 0);
SimpleHashMap::Entry* entry =
socket_map_.Lookup(GetHashmapKeyFromFd(handle->fd()),
GetHashmapHashFromFd(handle->fd()), true);
ASSERT(entry != NULL);
DescriptorInfo* di = reinterpret_cast<DescriptorInfo*>(entry->value);
if (di == NULL) {
// If there is no data in the hash map for this file descriptor a
// new DescriptorInfo for the file descriptor is inserted.
if (is_listening) {
di = new DescriptorInfoMultiple(fd);
} else {
di = new DescriptorInfoSingle(fd);
}
entry->value = di;
}
ASSERT(fd == di->fd());
return di;
}
void EventHandlerImplementation::WakeupHandler(intptr_t id,
Dart_Port dart_port,
int64_t data) {
COMPILE_ASSERT(sizeof(InterruptMessage) <= sizeof(zx_packet_user_t));
zx_port_packet_t pkt;
InterruptMessage* msg = reinterpret_cast<InterruptMessage*>(&pkt.user);
pkt.key = kInterruptPacketKey;
msg->id = id;
msg->dart_port = dart_port;
msg->data = data;
zx_status_t status = zx_port_queue(port_handle_, &pkt);
if (status != ZX_OK) {
// This is a FATAL because the VM won't work at all if we can't send any
// messages to the EventHandler thread.
FATAL1("zx_port_queue failed: %s\n", zx_status_get_string(status));
}
}
void EventHandlerImplementation::HandleInterrupt(InterruptMessage* msg) {
if (msg->id == kTimerId) {
LOG_INFO("HandleInterrupt read timer update\n");
timeout_queue_.UpdateTimeout(msg->dart_port, msg->data);
return;
} else if (msg->id == kShutdownId) {
LOG_INFO("HandleInterrupt read shutdown\n");
shutdown_ = true;
return;
}
ASSERT((msg->data & COMMAND_MASK) != 0);
LOG_INFO("HandleInterrupt command:\n");
Socket* socket = reinterpret_cast<Socket*>(msg->id);
RefCntReleaseScope<Socket> rs(socket);
if (socket->fd() == -1) {
return;
}
IOHandle* io_handle = reinterpret_cast<IOHandle*>(socket->fd());
const intptr_t fd = io_handle->fd();
DescriptorInfo* di =
GetDescriptorInfo(socket->fd(), IS_LISTENING_SOCKET(msg->data));
ASSERT(io_handle == di->io_handle());
if (IS_COMMAND(msg->data, kShutdownReadCommand)) {
ASSERT(!di->IsListeningSocket());
// Close the socket for reading.
LOG_INFO("\tSHUT_RD: %ld\n", fd);
VOID_NO_RETRY_EXPECTED(shutdown(fd, SHUT_RD));
} else if (IS_COMMAND(msg->data, kShutdownWriteCommand)) {
ASSERT(!di->IsListeningSocket());
// Close the socket for writing.
LOG_INFO("\tSHUT_WR: %ld\n", fd);
VOID_NO_RETRY_EXPECTED(shutdown(fd, SHUT_WR));
} else if (IS_COMMAND(msg->data, kCloseCommand)) {
// Close the socket and free system resources and move on to next
// message.
const intptr_t old_mask = di->Mask();
Dart_Port port = msg->dart_port;
if (port != ILLEGAL_PORT) {
di->RemovePort(port);
}
const intptr_t new_mask = di->Mask();
UpdatePort(old_mask, di);
LOG_INFO("\tCLOSE: %ld: %lx -> %lx\n", fd, old_mask, new_mask);
if (di->IsListeningSocket()) {
// We only close the socket file descriptor from the operating
// system if there are no other dart socket objects which
// are listening on the same (address, port) combination.
ListeningSocketRegistry* registry = ListeningSocketRegistry::Instance();
MutexLocker locker(registry->mutex());
if (registry->CloseSafe(socket)) {
ASSERT(new_mask == 0);
socket_map_.Remove(GetHashmapKeyFromFd(fd), GetHashmapHashFromFd(fd));
di->Close();
delete di;
socket->CloseFd();
}
socket->SetClosedFd();
} else {
ASSERT(new_mask == 0);
socket_map_.Remove(GetHashmapKeyFromFd(fd), GetHashmapHashFromFd(fd));
di->Close();
delete di;
socket->CloseFd();
}
if (port != 0) {
const bool success = DartUtils::PostInt32(port, 1 << kDestroyedEvent);
if (!success) {
LOG_INFO("Failed to post destroy event to port %ld\n", port);
}
}
} else if (IS_COMMAND(msg->data, kReturnTokenCommand)) {
const int count = TOKEN_COUNT(msg->data);
const intptr_t old_mask = di->Mask();
LOG_INFO("\t Return Token: %ld: %lx\n", fd, old_mask);
di->ReturnTokens(msg->dart_port, count);
UpdatePort(old_mask, di);
} else if (IS_COMMAND(msg->data, kSetEventMaskCommand)) {
// `events` can only have kInEvent/kOutEvent flags set.
const intptr_t events = msg->data & EVENT_MASK;
ASSERT(0 == (events & ~(1 << kInEvent | 1 << kOutEvent)));
const intptr_t old_mask = di->Mask();
LOG_INFO("\t Set Event Mask: %ld: %lx %lx\n", fd, old_mask,
msg->data & EVENT_MASK);
di->SetPortAndMask(msg->dart_port, msg->data & EVENT_MASK);
UpdatePort(old_mask, di);
} else {
UNREACHABLE();
}
}
void EventHandlerImplementation::HandlePacket(zx_port_packet_t* pkt) {
LOG_INFO("HandlePacket: Got event packet: key=%lx\n", pkt->key);
LOG_INFO("HandlePacket: Got event packet: type=%x\n", pkt->type);
LOG_INFO("HandlePacket: Got event packet: status=%d\n", pkt->status);
if (pkt->type == ZX_PKT_TYPE_USER) {
ASSERT(pkt->key == kInterruptPacketKey);
InterruptMessage* msg = reinterpret_cast<InterruptMessage*>(&pkt->user);
HandleInterrupt(msg);
return;
}
LOG_INFO("HandlePacket: Got event packet: observed = %x\n",
pkt->signal.observed);
LOG_INFO("HandlePacket: Got event packet: count = %ld\n", pkt->signal.count);
DescriptorInfo* di = reinterpret_cast<DescriptorInfo*>(pkt->key);
zx_signals_t observed = pkt->signal.observed;
const intptr_t old_mask = di->Mask();
const uint32_t epoll_event = di->io_handle()->WaitEnd(observed);
intptr_t event_mask = IOHandle::EpollEventsToMask(epoll_event);
if ((event_mask & (1 << kErrorEvent)) != 0) {
di->NotifyAllDartPorts(event_mask);
} else if (event_mask != 0) {
event_mask = di->io_handle()->ToggleEvents(event_mask);
if (event_mask != 0) {
Dart_Port port = di->NextNotifyDartPort(event_mask);
ASSERT(port != 0);
bool success = DartUtils::PostInt32(port, event_mask);
if (!success) {
// This can happen if e.g. the isolate that owns the port has died
// for some reason.
LOG_INFO("Failed to post event to port %ld\n", port);
}
}
}
UpdatePort(old_mask, di);
}
int64_t EventHandlerImplementation::GetTimeout() const {
if (!timeout_queue_.HasTimeout()) {
return kInfinityTimeout;
}
int64_t millis =
timeout_queue_.CurrentTimeout() - TimerUtils::GetCurrentMonotonicMillis();
return (millis < 0) ? 0 : millis;
}
void EventHandlerImplementation::HandleTimeout() {
if (timeout_queue_.HasTimeout()) {
int64_t millis = timeout_queue_.CurrentTimeout() -
TimerUtils::GetCurrentMonotonicMillis();
if (millis <= 0) {
DartUtils::PostNull(timeout_queue_.CurrentPort());
timeout_queue_.RemoveCurrent();
}
}
}
void EventHandlerImplementation::Poll(uword args) {
EventHandler* handler = reinterpret_cast<EventHandler*>(args);
EventHandlerImplementation* handler_impl = &handler->delegate_;
ASSERT(handler_impl != NULL);
zx_port_packet_t pkt;
while (!handler_impl->shutdown_) {
int64_t millis = handler_impl->GetTimeout();
ASSERT((millis == kInfinityTimeout) || (millis >= 0));
LOG_INFO("zx_port_wait(millis = %ld)\n", millis);
zx_status_t status = zx_port_wait(handler_impl->port_handle_,
millis == kInfinityTimeout
? ZX_TIME_INFINITE
: zx_deadline_after(ZX_MSEC(millis)),
&pkt);
if (status == ZX_ERR_TIMED_OUT) {
handler_impl->HandleTimeout();
} else if (status != ZX_OK) {
FATAL1("zx_port_wait failed: %s\n", zx_status_get_string(status));
} else {
handler_impl->HandleTimeout();
handler_impl->HandlePacket(&pkt);
}
}
DEBUG_ASSERT(ReferenceCounted<Socket>::instances() == 0);
handler->NotifyShutdownDone();
}
void EventHandlerImplementation::Start(EventHandler* handler) {
int result =
Thread::Start("dart:io EventHandler", &EventHandlerImplementation::Poll,
reinterpret_cast<uword>(handler));
if (result != 0) {
FATAL1("Failed to start event handler thread %d", result);
}
}
void EventHandlerImplementation::Shutdown() {
SendData(kShutdownId, 0, 0);
}
void EventHandlerImplementation::SendData(intptr_t id,
Dart_Port dart_port,
int64_t data) {
WakeupHandler(id, dart_port, data);
}
void* EventHandlerImplementation::GetHashmapKeyFromFd(intptr_t fd) {
// The hashmap does not support keys with value 0.
return reinterpret_cast<void*>(fd + 1);
}
uint32_t EventHandlerImplementation::GetHashmapHashFromFd(intptr_t fd) {
// The hashmap does not support keys with value 0.
return dart::Utils::WordHash(fd + 1);
}
} // namespace bin
} // namespace dart
#endif // defined(DART_HOST_OS_FUCHSIA)