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Kernel: Remove memory allocations from the new Blocker API

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This commit is contained in:
Robin Burchell 2019-07-19 10:12:50 +02:00 committed by Andreas Kling
parent 99c5377653
commit cd76b691fb
Notes: sideshowbarker 2024-07-19 13:09:12 +09:00 
Author: https://github.com/rburchell
Commit: https://github.com/SerenityOS/serenity/commit/cd76b691fbe
Pull-request: https://github.com/SerenityOS/serenity/pull/340
6 changed files with 27 additions and 27 deletions
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2
Kernel/Net/IPv4Socket.cpp
View file

@ -212,7 +212,7 @@ ssize_t IPv4Socket::recvfrom(FileDescription& description, void* buffer, size_t
}
load_receive_deadline();
current->block(*new Thread::ReceiveBlocker(description));
current->block<Thread::ReceiveBlocker>(description);
LOCKER(lock());
if (!m_can_read) {

2
Kernel/Net/TCPSocket.cpp
View file

@ -162,7 +162,7 @@ KResult TCPSocket::protocol_connect(FileDescription& description, ShouldBlock sh
m_state = State::Connecting;
if (should_block == ShouldBlock::Yes) {
current->block(*new Thread::ConnectBlocker(description));
current->block<Thread::ConnectBlocker>(description);
ASSERT(is_connected());
return KSuccess;
}

20
Kernel/Process.cpp
View file

@ -869,7 +869,7 @@ ssize_t Process::sys$writev(int fd, const struct iovec* iov, int iov_count)
}
if (current->has_unmasked_pending_signals()) {
current->block(*new Thread::SemiPermanentBlocker(Thread::SemiPermanentBlocker::Reason::Signal));
current->block<Thread::SemiPermanentBlocker>(Thread::SemiPermanentBlocker::Reason::Signal);
if (nwritten == 0)
return -EINTR;
}
@ -900,7 +900,7 @@ ssize_t Process::do_write(FileDescription& description, const u8* data, int data
#ifdef IO_DEBUG
dbgprintf("block write on %d\n", fd);
#endif
current->block(*new Thread::WriteBlocker(description));
current->block<Thread::WriteBlocker>(description);
}
ssize_t rc = description.write(data + nwritten, data_size - nwritten);
#ifdef IO_DEBUG
@ -914,7 +914,7 @@ ssize_t Process::do_write(FileDescription& description, const u8* data, int data
if (rc == 0)
break;
if (current->has_unmasked_pending_signals()) {
current->block(*new Thread::SemiPermanentBlocker(Thread::SemiPermanentBlocker::Reason::Signal));
current->block<Thread::SemiPermanentBlocker>(Thread::SemiPermanentBlocker::Reason::Signal);
if (nwritten == 0)
return -EINTR;
}
@ -939,7 +939,7 @@ ssize_t Process::sys$write(int fd, const u8* data, ssize_t size)
return -EBADF;
auto nwritten = do_write(*description, data, size);
if (current->has_unmasked_pending_signals()) {
current->block(*new Thread::SemiPermanentBlocker(Thread::SemiPermanentBlocker::Reason::Signal));
current->block<Thread::SemiPermanentBlocker>(Thread::SemiPermanentBlocker::Reason::Signal);
if (nwritten == 0)
return -EINTR;
}
@ -962,7 +962,7 @@ ssize_t Process::sys$read(int fd, u8* buffer, ssize_t size)
return -EBADF;
if (description->is_blocking()) {
if (!description->can_read()) {
current->block(*new Thread::ReadBlocker(*description));
current->block<Thread::ReadBlocker>(*description);
if (current->m_was_interrupted_while_blocked)
return -EINTR;
}
@ -1265,7 +1265,7 @@ int Process::sys$kill(pid_t pid, int signal)
}
if (pid == m_pid) {
current->send_signal(signal, this);
current->block(*new Thread::SemiPermanentBlocker(Thread::SemiPermanentBlocker::Reason::Signal));
current->block<Thread::SemiPermanentBlocker>(Thread::SemiPermanentBlocker::Reason::Signal);
return 0;
}
InterruptDisabler disabler;
@ -1442,7 +1442,7 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
}
pid_t waitee_pid = waitee;
current->block(*new Thread::WaitBlocker(options, waitee_pid));
current->block<Thread::WaitBlocker>(options, waitee_pid);
if (current->m_was_interrupted_while_blocked)
return -EINTR;
@ -1827,7 +1827,7 @@ int Process::sys$select(const Syscall::SC_select_params* params)
#endif
if (!params->timeout || select_has_timeout)
current->block(*new Thread::SelectBlocker(timeout, select_has_timeout, rfds, wfds, efds));
current->block<Thread::SelectBlocker>(timeout, select_has_timeout, rfds, wfds, efds);
int marked_fd_count = 0;
auto mark_fds = [&](auto* fds, auto& vector, auto should_mark) {
@ -1882,7 +1882,7 @@ int Process::sys$poll(pollfd* fds, int nfds, int timeout)
#endif
if (has_timeout|| timeout < 0)
current->block(*new Thread::SelectBlocker(actual_timeout, has_timeout, rfds, wfds, Thread::SelectBlocker::FDVector()));
current->block<Thread::SelectBlocker>(actual_timeout, has_timeout, rfds, wfds, Thread::SelectBlocker::FDVector());
int fds_with_revents = 0;
@ -2125,7 +2125,7 @@ int Process::sys$accept(int accepting_socket_fd, sockaddr* address, socklen_t* a
auto& socket = *accepting_socket_description->socket();
if (!socket.can_accept()) {
if (accepting_socket_description->is_blocking()) {
current->block(*new Thread::AcceptBlocker(*accepting_socket_description));
current->block<Thread::AcceptBlocker>(*accepting_socket_description);
if (current->m_was_interrupted_while_blocked)
return -EINTR;
} else {

14
Kernel/Thread.cpp
View file

@ -110,9 +110,7 @@ void Thread::unblock()
void Thread::block_until(const char* state_string, Function<bool()>&& condition)
{
m_blocker = make<ConditionBlocker>(state_string, condition);
block_helper();
Scheduler::yield();
block<ConditionBlocker>(state_string, condition);
}
void Thread::block_helper()
@ -126,17 +124,11 @@ void Thread::block_helper()
process().big_lock().lock();
}
void Thread::block(Blocker& blocker)
{
m_blocker = &blocker;
block_helper();
}
u64 Thread::sleep(u32 ticks)
{
ASSERT(state() == Thread::Running);
u64 wakeup_time = g_uptime + ticks;
current->block(*new Thread::SleepBlocker(wakeup_time));
current->block<Thread::SleepBlocker>(wakeup_time);
return wakeup_time;
}
@ -532,7 +524,7 @@ KResult Thread::wait_for_connect(FileDescription& description)
auto& socket = *description.socket();
if (socket.is_connected())
return KSuccess;
block(*new Thread::ConnectBlocker(description));
block<Thread::ConnectBlocker>(description);
Scheduler::yield();
if (!socket.is_connected())
return KResult(-ECONNREFUSED);

14
Kernel/Thread.h
View file

@ -208,9 +208,17 @@ public:
u32 ticks() const { return m_ticks; }
u64 sleep(u32 ticks);
void block(Blocker& blocker);
void unblock();
template <typename T, class... Args>
void block(Args&& ... args)
{
ASSERT(!m_blocker);
T t(AK::forward<Args>(args)...);
m_blocker = &t;
block_helper();
};
void unblock();
void block_until(const char* state_string, Function<bool()>&&);
KResult wait_for_connect(FileDescription&);
@ -292,7 +300,7 @@ private:
RefPtr<Region> m_kernel_stack_for_signal_handler_region;
SignalActionData m_signal_action_data[32];
Region* m_signal_stack_user_region { nullptr };
OwnPtr<Blocker> m_blocker;
Blocker* m_blocker { nullptr };
FPUState* m_fpu_state { nullptr };
InlineLinkedList<Thread>* m_thread_list { nullptr };
State m_state { Invalid };

2
Kernel/init.cpp
View file

@ -242,7 +242,7 @@ extern "C" [[noreturn]] void init()
current->process().set_priority(Process::LowPriority);
for (;;) {
Thread::finalize_dying_threads();
current->block(*new Thread::SemiPermanentBlocker(Thread::SemiPermanentBlocker::Reason::Lurking));
current->block<Thread::SemiPermanentBlocker>(Thread::SemiPermanentBlocker::Reason::Lurking);
Scheduler::yield();
}
});