pwritev

Signed-off-by: Loris Cro <kappaloris@gmail.com>

lib/std/event/loop.zig

@@ -1022,7 +1022,7 @@ pub const Loop = struct {
 
     /// Performs an async `os.pwrite` using a separate thread.
     /// `fd` must block and not return EAGAIN.
-    pub fn pwrite(self: *Loop, fd: os.fd_t, bytes: []const u8, offset: u64, simulate_evented: bool) os.PWriteError!usize {
+    pub fn pwrite(self: *Loop, fd: os.fd_t, bytes: []const u8, offset: u64, simulate_evented: bool) os.PerformsWriteError!usize {
         if (simulate_evented) {
             var req_node = Request.Node{
                 .data = .{
@@ -1056,24 +1056,36 @@ pub const Loop = struct {
 
     /// Performs an async `os.pwritev` using a separate thread.
     /// `fd` must block and not return EAGAIN.
-    pub fn pwritev(self: *Loop, fd: os.fd_t, iov: []const os.iovec_const, offset: u64) os.PWriteError!usize {
-        var req_node = Request.Node{
-            .data = .{
-                .msg = .{
-                    .pwritev = .{
-                        .fd = fd,
-                        .iov = iov,
-                        .offset = offset,
-                        .result = undefined,
+    pub fn pwritev(self: *Loop, fd: os.fd_t, iov: []const os.iovec_const, offset: u64, simulate_evented: bool) os.PWriteError!usize {
+        if (simulate_evented) {
+            var req_node = Request.Node{
+                .data = .{
+                    .msg = .{
+                        .pwritev = .{
+                            .fd = fd,
+                            .iov = iov,
+                            .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.pwritev.result;
+        } else {
+            while (true) {
+                return os.pwritev(fd, iov, offset) catch |err| switch (err) {
+                    error.WouldBlock => {
+                        self.waitUntilFdWritable(fd);
+                        continue;
+                    },
+                    else => return err,
+                };
+            }
         }
-        return req_node.data.msg.pwritev.result;
     }
 
     /// Performs an async `os.faccessatZ` using a separate thread.

lib/std/fs/file.zig

@@ -621,10 +621,12 @@ pub const File = struct {
             if (iovecs.len == 0) return @as(usize, 0);
             const first = iovecs[0];
             return windows.WriteFile(self.handle, first.iov_base[0..first.iov_len], offset, self.intended_io_mode);
-        } else if (self.capable_io_mode != self.intended_io_mode) {
-            return std.event.Loop.instance.?.pwritev(self.handle, iovecs, offset);
-        } else {
+        }
+
+        if (self.intended_io_mode == .blocking) {
             return os.pwritev(self.handle, iovecs, offset);
+        } else {
+            return std.event.Loop.instance.?.pwritev(self.handle, iovecs, offset, self.capable_io_mode != self.intended_io_mode);
         }
     }
 

lib/std/os.zig

@@ -958,12 +958,7 @@ pub fn pwritev(fd: fd_t, iov: []const iovec_const, offset: u64) PWriteError!usiz
             EINTR => continue,
             EINVAL => unreachable,
             EFAULT => unreachable,
-            EAGAIN => if (std.event.Loop.instance) |loop| {
-                loop.waitUntilFdWritable(fd);
-                continue;
-            } else {
-                return error.WouldBlock;
-            },
+            EAGAIN => return error.WouldBlock,
             EBADF => return error.NotOpenForWriting, // Can be a race condition.
             EDESTADDRREQ => unreachable, // `connect` was never called.
             EDQUOT => return error.DiskQuota,