semaphore: More changes for Switch.

This commit is contained in:
bunnei 2018-01-07 16:52:23 -05:00
parent 0f6fbdb963
commit 4e33b4b42f
2 changed files with 17 additions and 11 deletions

View file

@ -14,7 +14,8 @@ namespace Kernel {
Semaphore::Semaphore() {}
Semaphore::~Semaphore() {}
ResultVal<SharedPtr<Semaphore>> Semaphore::Create(VAddr guest_addr, VAddr mutex_addr, std::string name) {
ResultVal<SharedPtr<Semaphore>> Semaphore::Create(VAddr guest_addr, VAddr mutex_addr,
std::string name) {
SharedPtr<Semaphore> semaphore(new Semaphore);
// When the semaphore is created, some slots are reserved for other threads,
@ -37,23 +38,28 @@ bool Semaphore::ShouldWait(Thread* thread) const {
void Semaphore::Acquire(Thread* thread) {
if (available_count <= 0)
return;
--available_count;
UpdateGuestState();
}
ResultVal<s32> Semaphore::Release(s32 release_count) {
s32 previous_count = available_count;
available_count += release_count;
ResultCode Semaphore::Release(s32 target) {
++available_count;
UpdateGuestState();
if (target == -1) {
// When -1, wake up all waiting threads
WakeupAllWaitingThreads();
} else {
// Otherwise, wake up just a single thread
WakeupWaitingThread(GetHighestPriorityReadyThread());
}
return MakeResult<s32>(previous_count);
return RESULT_SUCCESS;
}
void Semaphore::UpdateGuestState() {
Memory::Write32(guest_addr, available_count);
}
} // namespace Kernel

View file

@ -50,11 +50,11 @@ public:
void Acquire(Thread* thread) override;
/**
* Releases a certain number of slots from a semaphore.
* @param release_count The number of slots to release
* @return The number of free slots the semaphore had before this call
* Releases a slot from a semaphore.
* @param target The number of threads to wakeup, -1 is all.
* @return ResultCode indicating if the operation succeeded.
*/
ResultVal<s32> Release(s32 release_count);
ResultCode Release(s32 target);
private:
Semaphore();