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fssystem: add unique lock apis

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This commit is contained in:
Michael Scire 2022-03-28 14:29:22 -07:00
parent 28f11a86fd
commit 2e6223d9d0
2 changed files with 112 additions and 3 deletions
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103
libraries/libstratosphere/include/stratosphere/fssystem/fssystem_utility.hpp
View file

@ -112,10 +112,30 @@ namespace ams::fssystem {
R_RETURN(CopyDirectoryRecursively(fs, fs, dst_path, src_path, entry, work_buf, work_buf_size));
}
/* Semaphore adapter class. */
class SemaphoreAdapter : public os::Semaphore {
/* Locking utilities. */
class SemaphoreAdaptor : public os::Semaphore {
public:
SemaphoreAdapter(int c, int mc) : os::Semaphore(c, mc) { /* ... */ }
SemaphoreAdaptor(int c, int mc) : os::Semaphore(c, mc) { /* ... */ }
bool TryLock(int *out_acquired, int count) {
AMS_ASSERT(count > 0);
for (auto i = 0; i < count; ++i) {
if (!this->TryAcquire()) {
*out_acquired = i;
return false;
}
}
*out_acquired = count;
return true;
}
void Unlock(int count) {
if (count > 0) {
this->Release(count);
}
}
bool try_lock() {
return this->TryAcquire();
@ -126,6 +146,83 @@ namespace ams::fssystem {
}
};
Result TryAcquireCountSemaphore(util::unique_lock<SemaphoreAdaptor> *out, SemaphoreAdaptor *adaptor);
class IUniqueLock {
NON_COPYABLE(IUniqueLock);
NON_MOVEABLE(IUniqueLock);
public:
virtual ~IUniqueLock() { /* ... */ }
};
template<typename T>
class UniqueLockWithPin final : public IUniqueLock, public ::ams::fs::impl::Newable {
private:
util::unique_lock<SemaphoreAdaptor> m_lock;
T m_pinned_object;
public:
UniqueLockWithPin(util::unique_lock<SemaphoreAdaptor> lock, T obj) : m_lock(std::move(lock)), m_pinned_object(std::move(obj)) { /* ... */ }
virtual ~UniqueLockWithPin() override {
m_lock = {};
}
};
template<typename T>
class MultiLockWithPin final : public IUniqueLock, public ::ams::fs::impl::Newable {
private:
T m_pinned_object;
SemaphoreAdaptor *m_semaphore_adaptor;
int m_lock_count;
public:
MultiLockWithPin(T obj, SemaphoreAdaptor *adaptor) : m_pinned_object(std::move(obj)), m_semaphore_adaptor(adaptor), m_lock_count(0) {
/* ... */
}
virtual ~MultiLockWithPin() override {
if (m_lock_count > 0) {
m_semaphore_adaptor->Unlock(m_lock_count);
}
}
Result Lock(int count) {
AMS_ASSERT(m_lock_count == 0);
R_UNLESS(m_semaphore_adaptor->TryLock(std::addressof(m_lock_count), count), fs::ResultOpenCountLimit());
R_SUCCEED();
}
};
template<typename T>
Result MakeUniqueLockWithPin(std::unique_ptr<IUniqueLock> *out, SemaphoreAdaptor *adaptor, T obj) {
/* Create the semaphore unique lock. */
util::unique_lock<SemaphoreAdaptor> sema_lock;
R_TRY(TryAcquireCountSemaphore(std::addressof(sema_lock), adaptor));
/* Create the output unique lock. */
auto result_lock = std::unique_ptr<UniqueLockWithPin<T>>(new UniqueLockWithPin<T>(std::move(sema_lock), std::move(obj)));
R_UNLESS(result_lock != nullptr, fs::ResultAllocationMemoryFailedNew());
/* Set the output. */
*out = std::move(result_lock);
R_SUCCEED();
}
template<typename T>
Result MakeUniqueLockWithPin(std::unique_ptr<IUniqueLock> *out, SemaphoreAdaptor *adaptor, int count, T obj) {
/* Create the output unique lock. */
auto result_lock = std::unique_ptr<MultiLockWithPin<T>>(new MultiLockWithPin<T>(std::move(obj), adaptor));
R_UNLESS(result_lock != nullptr, fs::ResultAllocationMemoryFailedNew());
/* Acquire the output lock. */
R_TRY(result_lock->Lock(count));
/* Set the output. */
*out = std::move(result_lock);
R_SUCCEED();
}
/* Other utility. */
Result HasFile(bool *out, fs::fsa::IFileSystem *fs, const fs::Path &path);
Result HasDirectory(bool *out, fs::fsa::IFileSystem *fs, const fs::Path &path);

12
libraries/libstratosphere/source/fssystem/fssystem_utility.cpp
View file

@ -158,6 +158,18 @@ namespace ams::fssystem {
R_SUCCEED();
}
Result TryAcquireCountSemaphore(util::unique_lock<SemaphoreAdaptor> *out, SemaphoreAdaptor *adaptor) {
/* Create deferred unique lock. */
util::unique_lock<SemaphoreAdaptor> lock(*adaptor, std::defer_lock);
/* Try to lock. */
R_UNLESS(lock.try_lock(), fs::ResultOpenCountLimit());
/* Set the output lock. */
*out = std::move(lock);
R_SUCCEED();
}
void AddCounter(void *_counter, size_t counter_size, u64 value) {
u8 *counter = static_cast<u8 *>(_counter);
u64 remaining = value;