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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_PROCESS_REUSE_POLICY_H_
#define CONTENT_BROWSER_PROCESS_REUSE_POLICY_H_
namespace content {
// The policy to apply when selecting a RenderProcessHost for a SiteInstance.
// If no suitable RenderProcessHost for the SiteInstance exists according to the
// policy, and there are processes with unmatched service workers for the site,
// the newest process with an unmatched service worker is reused. If still no
// RenderProcessHost exists, a new RenderProcessHost will be created unless the
// soft process limit has been reached. When the limit has been reached, an
// existing suitable (e.g., same-site if Site Isolation is enabled)
// RenderProcessHost will be chosen randomly to be reused when possible.
enum class ProcessReusePolicy {
// In this mode, all instances of the site will be hosted in the same
// RenderProcessHost.
PROCESS_PER_SITE,
// In this mode, the subframe's site will be rendered in a RenderProcessHost
// that is already in use for the site, either for a pending navigation or a
// committed navigation. If multiple such processes exist, ones that have
// foreground frames are given priority, and otherwise one is selected
// randomly.
REUSE_PENDING_OR_COMMITTED_SITE_SUBFRAME,
// Similar to REUSE_PENDING_OR_COMMITTED_SITE_SUBFRAME, but only applied to
// workers. Reuse decisions may vary from those for
// REUSE_PENDING_OR_COMMITTED_SITE_SUBFRAME.
REUSE_PENDING_OR_COMMITTED_SITE_WORKER,
// When used, this is similar to REUSE_PENDING_OR_COMMITTED_SITE_SUBFRAME, but
// for main frames, and limiting the number of main frames a RenderProcessHost
// can host to a certain threshold.
REUSE_PENDING_OR_COMMITTED_SITE_WITH_MAIN_FRAME_THRESHOLD,
// In this mode, SiteInstances don't proactively reuse processes. An
// existing process with an unmatched service worker for the site is reused
// only for navigations, not for service workers. When the process limit has
// been reached, a randomly chosen RenderProcessHost is reused as in the
// other policies.
DEFAULT,
};
} // namespace content
#endif // CONTENT_BROWSER_PROCESS_REUSE_POLICY_H_
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