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pread

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Signed-off-by: Loris Cro <kappaloris@gmail.com>
This commit is contained in:
Loris Cro 2020-06-19 23:08:34 +02:00
parent bc35435ca6
commit bd9f2369d5
3 changed files with 33 additions and 24 deletions
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42
lib/std/event/loop.zig
View File

@ -888,24 +888,36 @@ pub const Loop = struct {
/// Performs an async `os.pread` using a separate thread.
/// `fd` must block and not return EAGAIN.
pub fn pread(self: *Loop, fd: os.fd_t, buf: []u8, offset: u64) os.PReadError!usize {
var req_node = Request.Node{
.data = .{
.msg = .{
.pread = .{
.fd = fd,
.buf = buf,
.offset = offset,
.result = undefined,
pub fn pread(self: *Loop, fd: os.fd_t, buf: []u8, offset: u64, simulate_evented: bool) os.PReadError!usize {
if (simulate_evented) {
var req_node = Request.Node{
.data = .{
.msg = .{
.pread = .{
.fd = fd,
.buf = buf,
.offset = offset,
.result = undefined,
},
},
.finish = .{ .TickNode = .{ .data = @frame() } },
},
.finish = .{ .TickNode = .{ .data = @frame() } },
},
};
suspend {
self.posixFsRequest(&req_node);
};
suspend {
self.posixFsRequest(&req_node);
}
return req_node.data.msg.pread.result;
} else {
while (true) {
return os.pread(fd, buf, offset) catch |err| switch (err) {
error.WouldBlock => {
self.waitUntilFdReadable(fd);
continue;
},
else => return err,
};
}
}
return req_node.data.msg.pread.result;
}
/// Performs an async `os.preadv` using a separate thread.

8
lib/std/fs/file.zig
View File

@ -438,10 +438,12 @@ pub const File = struct {
pub fn pread(self: File, buffer: []u8, offset: u64) PReadError!usize {
if (is_windows) {
return windows.ReadFile(self.handle, buffer, offset, self.intended_io_mode);
} else if (self.capable_io_mode != self.intended_io_mode) {
return std.event.Loop.instance.?.pread(self.handle, buffer, offset);
} else {
}
if (self.intended_io_mode == .blocking) {
return os.pread(self.handle, buffer, offset);
} else {
return std.event.Loop.instance.?.pread(self.handle, buffer, offset, self.capable_io_mode != self.intended_io_mode);
}
}

7
lib/std/os.zig
View File

@ -482,12 +482,7 @@ pub fn pread(fd: fd_t, buf: []u8, offset: u64) PReadError!usize {
EINTR => continue,
EINVAL => unreachable,
EFAULT => unreachable,
EAGAIN => if (std.event.Loop.instance) |loop| {
loop.waitUntilFdReadable(fd);
continue;
} else {
return error.WouldBlock;
},
EAGAIN => return error.WouldBlock,
EBADF => return error.NotOpenForReading, // Can be a race condition.
EIO => return error.InputOutput,
EISDIR => return error.IsDir,