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Kernel: Consolidate the various BlockCondition::unblock variants

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The unblock_all variant used to ASSERT if a blocker didn't unblock,
but it wasn't clear from the name that it would do that. Because
the BlockCondition already asserts that no blockers are left at
destruction time, it would still catch blockers that haven't been
unblocked for whatever reason.

Fixes #4496
This commit is contained in:
Tom 2020-12-22 11:17:56 -07:00 committed by Andreas Kling
parent 94e4aa94b5
commit 49a76164c8
Notes: sideshowbarker 2024-07-19 00:23:34 +09:00 
Author: https://github.com/tomuta
Commit: https://github.com/SerenityOS/serenity/commit/49a76164c86
Pull-request: https://github.com/SerenityOS/serenity/pull/4500
Issue: https://github.com/SerenityOS/serenity/issues/4496
6 changed files with 16 additions and 57 deletions
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2
Kernel/FileSystem/File.h
View File

@ -58,7 +58,7 @@ public:
void unblock()
{
ScopedSpinLock lock(m_lock);
do_unblock([&](auto& b, void* data) {
do_unblock([&](auto& b, void* data, bool&) {
ASSERT(b.blocker_type() == Thread::Blocker::Type::File);
auto& blocker = static_cast<Thread::FileBlocker&>(b);
return blocker.unblock(false, data);

4
Kernel/FileSystem/Plan9FileSystem.cpp
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@ -469,7 +469,7 @@ bool Plan9FS::Plan9FSBlockCondition::should_add_blocker(Thread::Blocker& b, void
void Plan9FS::Plan9FSBlockCondition::unblock_completed(u16 tag)
{
unblock([&](Thread::Blocker& b, void*) {
unblock([&](Thread::Blocker& b, void*, bool&) {
ASSERT(b.blocker_type() == Thread::Blocker::Type::Plan9FS);
auto& blocker = static_cast<Blocker&>(b);
return blocker.unblock(tag);
@ -478,7 +478,7 @@ void Plan9FS::Plan9FSBlockCondition::unblock_completed(u16 tag)
void Plan9FS::Plan9FSBlockCondition::unblock_all()
{
BlockCondition::unblock_all([&](Thread::Blocker& b, void*) {
unblock([&](Thread::Blocker& b, void*, bool&) {
ASSERT(b.blocker_type() == Thread::Blocker::Type::Plan9FS);
auto& blocker = static_cast<Blocker&>(b);
return blocker.unblock();

2
Kernel/Net/Routing.cpp
View File

@ -77,7 +77,7 @@ class ARPTableBlockCondition : public Thread::BlockCondition {
public:
void unblock(const IPv4Address& ip_addr, const MACAddress& addr)
{
unblock_all([&](auto& b, void*) {
BlockCondition::unblock([&](auto& b, void*, bool&) {
ASSERT(b.blocker_type() == Thread::Blocker::Type::Routing);
auto& blocker = static_cast<ARPTableBlocker&>(b);
return blocker.unblock(false, ip_addr, addr);

51
Kernel/Thread.h
View File

@ -398,36 +398,14 @@ public:
protected:
template<typename UnblockOne>
void unblock(UnblockOne unblock_one)
bool unblock(UnblockOne unblock_one)
{
ScopedSpinLock lock(m_lock);
do_unblock(unblock_one);
return do_unblock(unblock_one);
}
template<typename UnblockOne>
void do_unblock(UnblockOne unblock_one)
{
ASSERT(m_lock.is_locked());
for (size_t i = 0; i < m_blockers.size();) {
auto& info = m_blockers[i];
if (unblock_one(*info.blocker, info.data)) {
m_blockers.remove(i);
continue;
}
i++;
}
}
template<typename UnblockOne>
bool unblock_some(UnblockOne unblock_one)
{
ScopedSpinLock lock(m_lock);
return do_unblock_some(unblock_one);
}
template<typename UnblockOne>
bool do_unblock_some(UnblockOne unblock_one)
bool do_unblock(UnblockOne unblock_one)
{
ASSERT(m_lock.is_locked());
bool stop_iterating = false;
@ -443,27 +421,6 @@ public:
return !stop_iterating;
}
template<typename UnblockOne>
bool unblock_all(UnblockOne unblock_one)
{
ScopedSpinLock lock(m_lock);
return do_unblock_all(unblock_one);
}
template<typename UnblockOne>
bool do_unblock_all(UnblockOne unblock_one)
{
ASSERT(m_lock.is_locked());
bool unblocked_any = false;
for (auto& info : m_blockers) {
bool did_unblock = unblock_one(*info.blocker, info.data);
unblocked_any |= did_unblock;
ASSERT(did_unblock);
}
m_blockers.clear();
return unblocked_any;
}
virtual bool should_add_blocker(Blocker&, void*) { return true; }
SpinLock<u8> m_lock;
@ -1167,7 +1124,7 @@ private:
private:
void do_unblock_joiner()
{
do_unblock_all([&](Blocker& b, void*) {
do_unblock([&](Blocker& b, void*, bool&) {
ASSERT(b.blocker_type() == Blocker::Type::Join);
auto& blocker = static_cast<JoinBlocker&>(b);
return blocker.unblock(exit_value(), false);

4
Kernel/ThreadBlockers.cpp
View File

@ -440,7 +440,7 @@ void Thread::WaitBlockCondition::disowned_by_waiter(Process& process)
for (size_t i = 0; i < m_processes.size();) {
auto& info = m_processes[i];
if (info.process == &process) {
do_unblock([&](Blocker& b, void*) {
do_unblock([&](Blocker& b, void*, bool&) {
ASSERT(b.blocker_type() == Blocker::Type::Wait);
auto& blocker = static_cast<WaitBlocker&>(b);
bool did_unblock = blocker.unblock(info.process, WaitBlocker::UnblockFlags::Disowned, 0, false);
@ -479,7 +479,7 @@ bool Thread::WaitBlockCondition::unblock(Process& process, WaitBlocker::UnblockF
}
}
do_unblock([&](Blocker& b, void*) {
do_unblock([&](Blocker& b, void*, bool&) {
ASSERT(b.blocker_type() == Blocker::Type::Wait);
auto& blocker = static_cast<WaitBlocker&>(b);
if (was_waited_already && blocker.is_wait())

10
Kernel/WaitQueue.cpp
View File

@ -55,7 +55,7 @@ void WaitQueue::wake_one()
#ifdef WAITQUEUE_DEBUG
dbg() << "WaitQueue @ " << this << ": wake_one";
#endif
bool did_unblock_one = do_unblock_some([&](Thread::Blocker& b, void* data, bool& stop_iterating) {
bool did_unblock_one = do_unblock([&](Thread::Blocker& b, void* data, bool& stop_iterating) {
ASSERT(data);
ASSERT(b.blocker_type() == Thread::Blocker::Type::Queue);
auto& blocker = static_cast<Thread::QueueBlocker&>(b);
@ -79,7 +79,7 @@ void WaitQueue::wake_n(u32 wake_count)
#ifdef WAITQUEUE_DEBUG
dbg() << "WaitQueue @ " << this << ": wake_n(" << wake_count << ")";
#endif
bool did_unblock_some = do_unblock_some([&](Thread::Blocker& b, void* data, bool& stop_iterating) {
bool did_unblock_some = do_unblock([&](Thread::Blocker& b, void* data, bool& stop_iterating) {
ASSERT(data);
ASSERT(b.blocker_type() == Thread::Blocker::Type::Queue);
auto& blocker = static_cast<Thread::QueueBlocker&>(b);
@ -103,14 +103,16 @@ void WaitQueue::wake_all()
#ifdef WAITQUEUE_DEBUG
dbg() << "WaitQueue @ " << this << ": wake_all";
#endif
bool did_unblock_any = do_unblock_all([&](Thread::Blocker& b, void* data) {
bool did_unblock_any = do_unblock([&](Thread::Blocker& b, void* data, bool&) {
ASSERT(data);
ASSERT(b.blocker_type() == Thread::Blocker::Type::Queue);
auto& blocker = static_cast<Thread::QueueBlocker&>(b);
#ifdef WAITQUEUE_DEBUG
dbg() << "WaitQueue @ " << this << ": wake_all unblocking " << *static_cast<Thread*>(data);
#endif
return blocker.unblock();
bool did_unblock = blocker.unblock();
ASSERT(did_unblock);
return true;
});
m_wake_requested = !did_unblock_any;
}