We like a LIFO default thread pool in tools like DM for better
memory/time locality... the bots use less memory this way, and
generally run faster.
But most use cases want a FIFO queue, so that they can get going
on the next parts of early work while later work is still running.
This splits the implementation into one using SkTArray and pop_back
for LIFO, and a new one using std::deque and pop_front for FIFO.
Change-Id: Ief203b6869a00f1f8084019431a781d15fc63750
Reviewed-on: https://skia-review.googlesource.com/41849
Commit-Queue: Mike Klein <mtklein@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Yuqian Li <liyuqian@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Refactoring to refamiliarize myself with SkTaskGroup and SkThreadPool.
This adds an SkExecutor interface to describe how we use SkThreadPool,
with a global setter and getter for a default instance. Then I rewrote
SkTaskGroup to work with any executor, the global default by default.
I also think I've made the SkTaskGroup::wait() borrow logic clearer
with the addition of SkSemaphore::try_wait(). This lets me keep the
semaphore count and actual count of work in perfect sync.
Change-Id: I6bbdfaeb0e2c3a43daff6192d34bc4a3f7210178
Reviewed-on: https://skia-review.googlesource.com/8836
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
