tree 6d47c81342d08fa3e7ea576b1798605149412cec
parent d347bc81299546946974c3811e821565c745bb5b
author Nick Maniscalco <maniscalco@google.com> 1565975617 +0000
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1565975617 +0000

[kernel][process][diagnostics] Use Reader handle table lock in ForEachHandle

This is a minor optimization.  No functional change.

ProcessDispatcher::ForEachHandle iterates the handle table, calling T
on each handle.  ForEachHandle itself does not modify the table.  T is
passed a zx_handle_t and no existing callers attempt to modify the
table.  Change ForEachHandle to use a Reader lock since Writer is
unnecessary.

ProcessDispatcher::GetVmos must acquire the process's handle table
lock before calling GetProcessVmosLocked as it iterates over the
process's VMOs. However, GetProcessVmosLocked does not modify the
handles or handle table so it does not need a Writer lock. Change
GetVmos to acquire a Reader lock instead.

Bug: 34652
Change-Id: I80ca496986f93e15caa8c99f05b448ad1f370e43