content/browser: Always specify thread affinity when posting tasks
*** Note: There is no behavior change from this patch. ***
The PostTask APIs will shortly be changed to require all tasks to explicitly
specify their thread affinity, i.e., whether the task should run on the thread
pool or a specific named thread such as a BrowserThread. This patch updates all
call sites with thread affinity annotation. We also remove the "WithTraits"
suffix to make the call sites more readable.
Before:
// Thread pool task.
base::PostTaskWithTraits(FROM_HERE, {...}, ...);
// UI thread task.
base::PostTaskWithTraits(FROM_HERE, {BrowserThread::UI, ...}, ...);
After:
// Thread pool task.
base::PostTask(FROM_HERE, {base::ThreadPool(), ...}, ...);
// UI thread task.
base::PostTask(FROM_HERE, {BrowserThread::UI, ...}, ...);
This patch was semi-automatically prepared with these steps:
1. Patch in https://chromium-review.googlesource.com/c/chromium/src/+/1635827
to make thread affinity a build-time requirement.
2. Run an initial pass with a clang rewriter:
https://chromium-review.googlesource.com/c/chromium/src/+/1635623
3. ninja -C out/Debug | grep 'requested here' | cut -d: -f1-3 | sort | \
uniq > errors.txt
4. while read line; do
f=$(echo $line | cut -d: -f 1)
r=$(echo $line | cut -d: -f 2)
c=$(echo $line | cut -d: -f 3)
sed -i "${r}s/./&base::ThreadPool(),/$c" $f
done < errors.txt
5. GOTO 3 until build succeeds.
6. Remove the "WithTraits" suffix from task API call sites:
$ tools/git/mffr.py -i <(cat <<EOF
[
["PostTaskWithTraits", "PostTask"],
["PostDelayedTaskWithTraits", "PostDelayedTask"],
["PostTaskWithTraitsAndReply", "PostTaskAndReply"],
["CreateTaskRunnerWithTraits", "CreateTaskRunner"],
["CreateSequencedTaskRunnerWithTraits", "CreateSequencedTaskRunner"],
["CreateUpdateableSequencedTaskRunnerWithTraits", "CreateUpdateableSequencedTaskRunner"],
["CreateSingleThreadTaskRunnerWithTraits", "CreateSingleThreadTaskRunner"],
["CreateCOMSTATaskRunnerWithTraits", "CreateCOMSTATaskRunner"]
]
EOF
)
This CL was uploaded by git cl split.
[email protected], [email protected]
Bug: 968047
Change-Id: I346372d16a3856186ea74d14e0dd8a12f7cacae5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1729589
Commit-Queue: Sami Kyöstilä <[email protected]>
Reviewed-by: Tom Sepez <[email protected]>
Reviewed-by: Bo <[email protected]>
Auto-Submit: Sami Kyöstilä <[email protected]>
Cr-Commit-Position: refs/heads/master@{#683554}
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index bc53deb9a..8893afd 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -4149,7 +4149,7 @@
// Android), the downloader service will be invalid. Pre-Mojo, this would
// hang the callback indefinitely since the IPC would be dropped. Now,
// respond with a 400 HTTP error code to indicate that something went wrong.
- base::PostTaskWithTraits(
+ base::PostTask(
FROM_HERE, {BrowserThread::UI},
base::BindOnce(&WebContentsImpl::OnDidDownloadImage,
weak_factory_.GetWeakPtr(), std::move(callback),
