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windows: std.fs functions support concurrent ops

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when reading and writing the same file descriptors
This commit is contained in:
Andrew Kelley 2018-09-12 13:55:02 -04:00
parent 0cfd019377
commit 178d69191b
3 changed files with 67 additions and 56 deletions
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2
src-self-hosted/main.zig
View File

@ -737,7 +737,7 @@ async fn fmtPath(fmt: *Fmt, file_path_ref: []const u8) FmtError!void {
file_path,
max_src_size,
)) catch |err| switch (err) {
error.IsDir => {
error.IsDir, error.AccessDenied => {
// TODO make event based (and dir.next())
var dir = try std.os.Dir.open(fmt.loop.allocator, file_path);
defer dir.close();

51
std/event/fs.zig
View File

@ -109,30 +109,28 @@ pub async fn pwriteWindows(loop: *Loop, fd: os.FileHandle, data: []const u8, off
.base = Loop.ResumeNode{
.id = Loop.ResumeNode.Id.Basic,
.handle = @handle(),
},
};
const completion_key = @ptrToInt(&resume_node.base);
// TODO support concurrent async ops on the file handle
// we can do this by ignoring completion key and using @fieldParentPtr with the *Overlapped
_ = try os.windowsCreateIoCompletionPort(fd, loop.os_data.io_port, completion_key, undefined);
var overlapped = windows.OVERLAPPED{
.overlapped = windows.OVERLAPPED{
.Internal = 0,
.InternalHigh = 0,
.Offset = @truncate(u32, offset),
.OffsetHigh = @truncate(u32, offset >> 32),
.hEvent = null,
},
},
};
// TODO only call create io completion port once per fd
_ = try os.windowsCreateIoCompletionPort(fd, loop.os_data.io_port, undefined, undefined);
loop.beginOneEvent();
errdefer loop.finishOneEvent();
errdefer {
_ = windows.CancelIoEx(fd, &overlapped);
_ = windows.CancelIoEx(fd, &resume_node.base.overlapped);
}
suspend {
_ = windows.WriteFile(fd, data.ptr, @intCast(windows.DWORD, data.len), null, &overlapped);
_ = windows.WriteFile(fd, data.ptr, @intCast(windows.DWORD, data.len), null, &resume_node.base.overlapped);
}
var bytes_transferred: windows.DWORD = undefined;
if (windows.GetOverlappedResult(fd, &overlapped, &bytes_transferred, windows.FALSE) == 0) {
if (windows.GetOverlappedResult(fd, &resume_node.base.overlapped, &bytes_transferred, windows.FALSE) == 0) {
const err = windows.GetLastError();
return switch (err) {
windows.ERROR.IO_PENDING => unreachable,
@ -243,30 +241,28 @@ pub async fn preadWindows(loop: *Loop, fd: os.FileHandle, data: []u8, offset: u6
.base = Loop.ResumeNode{
.id = Loop.ResumeNode.Id.Basic,
.handle = @handle(),
},
};
const completion_key = @ptrToInt(&resume_node.base);
// TODO support concurrent async ops on the file handle
// we can do this by ignoring completion key and using @fieldParentPtr with the *Overlapped
_ = try os.windowsCreateIoCompletionPort(fd, loop.os_data.io_port, completion_key, undefined);
var overlapped = windows.OVERLAPPED{
.overlapped = windows.OVERLAPPED{
.Internal = 0,
.InternalHigh = 0,
.Offset = @truncate(u32, offset),
.OffsetHigh = @truncate(u32, offset >> 32),
.hEvent = null,
},
},
};
// TODO only call create io completion port once per fd
_ = try os.windowsCreateIoCompletionPort(fd, loop.os_data.io_port, undefined, undefined);
loop.beginOneEvent();
errdefer loop.finishOneEvent();
errdefer {
_ = windows.CancelIoEx(fd, &overlapped);
_ = windows.CancelIoEx(fd, &resume_node.base.overlapped);
}
suspend {
_ = windows.ReadFile(fd, data.ptr, @intCast(windows.DWORD, data.len), null, &overlapped);
_ = windows.ReadFile(fd, data.ptr, @intCast(windows.DWORD, data.len), null, &resume_node.base.overlapped);
}
var bytes_transferred: windows.DWORD = undefined;
if (windows.GetOverlappedResult(fd, &overlapped, &bytes_transferred, windows.FALSE) == 0) {
if (windows.GetOverlappedResult(fd, &resume_node.base.overlapped, &bytes_transferred, windows.FALSE) == 0) {
const err = windows.GetLastError();
return switch (err) {
windows.ERROR.IO_PENDING => unreachable,
@ -1074,15 +1070,14 @@ pub fn Watch(comptime V: type) type {
.base = Loop.ResumeNode{
.id = Loop.ResumeNode.Id.Basic,
.handle = @handle(),
},
};
const completion_key = @ptrToInt(&resume_node.base);
var overlapped = windows.OVERLAPPED{
.overlapped = windows.OVERLAPPED{
.Internal = 0,
.InternalHigh = 0,
.Offset = 0,
.OffsetHigh = 0,
.hEvent = null,
},
},
};
var event_buf: [4096]u8 align(@alignOf(windows.FILE_NOTIFY_INFORMATION)) = undefined;
@ -1090,7 +1085,7 @@ pub fn Watch(comptime V: type) type {
_ = os.windowsCreateIoCompletionPort(
dir_handle,
self.channel.loop.os_data.io_port,
completion_key,
undefined,
undefined,
) catch |err| {
await (async self.channel.put(err) catch unreachable);
@ -1103,7 +1098,7 @@ pub fn Watch(comptime V: type) type {
self.channel.loop.beginOneEvent();
errdefer self.channel.loop.finishOneEvent();
errdefer {
_ = windows.CancelIoEx(dir_handle, &overlapped);
_ = windows.CancelIoEx(dir_handle, &resume_node.base.overlapped);
}
suspend {
_ = windows.ReadDirectoryChangesW(
@ -1116,13 +1111,13 @@ pub fn Watch(comptime V: type) type {
windows.FILE_NOTIFY_CHANGE_LAST_WRITE | windows.FILE_NOTIFY_CHANGE_LAST_ACCESS |
windows.FILE_NOTIFY_CHANGE_CREATION | windows.FILE_NOTIFY_CHANGE_SECURITY,
null, // number of bytes transferred (unused for async)
&overlapped,
&resume_node.base.overlapped,
null, // completion routine - unused because we use IOCP
);
}
}
var bytes_transferred: windows.DWORD = undefined;
if (windows.GetOverlappedResult(dir_handle, &overlapped, &bytes_transferred, windows.FALSE) == 0) {
if (windows.GetOverlappedResult(dir_handle, &resume_node.base.overlapped, &bytes_transferred, windows.FALSE) == 0) {
const errno = windows.GetLastError();
const err = switch (errno) {
else => os.unexpectedErrorWindows(errno),

46
std/event/loop.zig
View File

@ -27,6 +27,19 @@ pub const Loop = struct {
pub const ResumeNode = struct {
id: Id,
handle: promise,
overlapped: Overlapped,
const overlapped_init = switch (builtin.os) {
builtin.Os.windows => windows.OVERLAPPED{
.Internal = 0,
.InternalHigh = 0,
.Offset = 0,
.OffsetHigh = 0,
.hEvent = null,
},
else => {},
};
const Overlapped = @typeOf(overlapped_init);
pub const Id = enum {
Basic,
@ -101,6 +114,7 @@ pub const Loop = struct {
.final_resume_node = ResumeNode{
.id = ResumeNode.Id.Stop,
.handle = undefined,
.overlapped = ResumeNode.overlapped_init,
},
};
const extra_thread_count = thread_count - 1;
@ -153,6 +167,7 @@ pub const Loop = struct {
.base = ResumeNode{
.id = ResumeNode.Id.EventFd,
.handle = undefined,
.overlapped = ResumeNode.overlapped_init,
},
.eventfd = try os.linuxEventFd(1, posix.EFD_CLOEXEC | posix.EFD_NONBLOCK),
.epoll_op = posix.EPOLL_CTL_ADD,
@ -225,6 +240,7 @@ pub const Loop = struct {
.base = ResumeNode{
.id = ResumeNode.Id.EventFd,
.handle = undefined,
.overlapped = ResumeNode.overlapped_init,
},
// this one is for sending events
.kevent = posix.Kevent{
@ -311,6 +327,7 @@ pub const Loop = struct {
.base = ResumeNode{
.id = ResumeNode.Id.EventFd,
.handle = undefined,
.overlapped = ResumeNode.overlapped_init,
},
// this one is for sending events
.completion_key = @ptrToInt(&eventfd_node.data.base),
@ -325,8 +342,8 @@ pub const Loop = struct {
var i: usize = 0;
while (i < extra_thread_index) : (i += 1) {
while (true) {
const overlapped = @intToPtr(?*windows.OVERLAPPED, 0x1);
os.windowsPostQueuedCompletionStatus(self.os_data.io_port, undefined, @ptrToInt(&self.final_resume_node), overlapped) catch continue;
const overlapped = &self.final_resume_node.overlapped;
os.windowsPostQueuedCompletionStatus(self.os_data.io_port, undefined, undefined, overlapped) catch continue;
break;
}
}
@ -413,6 +430,7 @@ pub const Loop = struct {
.base = ResumeNode{
.id = ResumeNode.Id.Basic,
.handle = @handle(),
.overlapped = ResumeNode.overlapped_init,
},
.kev = undefined,
};
@ -489,15 +507,11 @@ pub const Loop = struct {
};
},
builtin.Os.windows => {
// this value is never dereferenced but we need it to be non-null so that
// the consumer code can decide whether to read the completion key.
// it has to do this for normal I/O, so we match that behavior here.
const overlapped = @intToPtr(?*windows.OVERLAPPED, 0x1);
os.windowsPostQueuedCompletionStatus(
self.os_data.io_port,
undefined,
eventfd_node.completion_key,
overlapped,
undefined,
&eventfd_node.base.overlapped,
) catch {
self.next_tick_queue.unget(next_tick_node);
self.available_eventfd_resume_nodes.push(resume_stack_node);
@ -606,8 +620,8 @@ pub const Loop = struct {
var i: usize = 0;
while (i < self.extra_threads.len + 1) : (i += 1) {
while (true) {
const overlapped = @intToPtr(?*windows.OVERLAPPED, 0x1);
os.windowsPostQueuedCompletionStatus(self.os_data.io_port, undefined, @ptrToInt(&self.final_resume_node), overlapped) catch continue;
const overlapped = &self.final_resume_node.overlapped;
os.windowsPostQueuedCompletionStatus(self.os_data.io_port, undefined, undefined, overlapped) catch continue;
break;
}
}
@ -680,17 +694,19 @@ pub const Loop = struct {
},
builtin.Os.windows => {
var completion_key: usize = undefined;
while (true) {
const overlapped = while (true) {
var nbytes: windows.DWORD = undefined;
var overlapped: ?*windows.OVERLAPPED = undefined;
switch (os.windowsGetQueuedCompletionStatus(self.os_data.io_port, &nbytes, &completion_key, &overlapped, windows.INFINITE)) {
switch (os.windowsGetQueuedCompletionStatus(self.os_data.io_port, &nbytes, &completion_key,
&overlapped, windows.INFINITE))
{
os.WindowsWaitResult.Aborted => return,
os.WindowsWaitResult.Normal => {},
os.WindowsWaitResult.Cancelled => continue,
}
if (overlapped != null) break;
}
const resume_node = @intToPtr(*ResumeNode, completion_key);
if (overlapped) |o| break o;
} else unreachable; // TODO else unreachable should not be necessary
const resume_node = @fieldParentPtr(ResumeNode, "overlapped", overlapped);
const handle = resume_node.handle;
const resume_node_id = resume_node.id;
switch (resume_node_id) {