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Kernel: Avoid allocations for Select vectors by using inline capacity

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Good tip by Andreas :)
This commit is contained in:
Robin Burchell 2019-07-19 09:04:12 +02:00 • committed by Andreas Kling
parent 52743f9eec
commit 750dbe986d
3 changed files with 13 additions and 11 deletions
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12
Kernel/Process.cpp
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@ -1798,9 +1798,9 @@ int Process::sys$select(const Syscall::SC_select_params* params)
select_has_timeout = true;
}
Vector<int> rfds;
Vector<int> wfds;
Vector<int> efds;
Thread::SelectBlocker::FDVector rfds;
Thread::SelectBlocker::FDVector wfds;
Thread::SelectBlocker::FDVector efds;
auto transfer_fds = [&](auto* fds, auto& vector) -> int {
vector.clear_with_capacity();
@ -1852,8 +1852,8 @@ int Process::sys$poll(pollfd* fds, int nfds, int timeout)
if (!validate_read_typed(fds))
return -EFAULT;
Vector<int> rfds;
Vector<int> wfds;
Thread::SelectBlocker::FDVector rfds;
Thread::SelectBlocker::FDVector wfds;
for (int i = 0; i < nfds; ++i) {
if (fds[i].events & POLLIN)
@ -1882,7 +1882,7 @@ int Process::sys$poll(pollfd* fds, int nfds, int timeout)
#endif
if (has_timeout|| timeout < 0)
current->block(*new Thread::SelectBlocker(actual_timeout, has_timeout, rfds, wfds, Vector<int>()));
current->block(*new Thread::SelectBlocker(actual_timeout, has_timeout, rfds, wfds, Thread::SelectBlocker::FDVector()));
int fds_with_revents = 0;