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-rw-r--r--src/core/hle/kernel/semaphore.cpp23
-rw-r--r--src/core/hle/kernel/semaphore.h9
-rw-r--r--src/core/hle/kernel/svc.cpp2
3 files changed, 16 insertions, 18 deletions
diff --git a/src/core/hle/kernel/semaphore.cpp b/src/core/hle/kernel/semaphore.cpp
index 9c58aa42f..b555bb28e 100644
--- a/src/core/hle/kernel/semaphore.cpp
+++ b/src/core/hle/kernel/semaphore.cpp
@@ -18,9 +18,6 @@ ResultVal<SharedPtr<Semaphore>> Semaphore::Create(VAddr guest_addr, VAddr mutex_
std::string name) {
SharedPtr<Semaphore> semaphore(new Semaphore);
- // When the semaphore is created, some slots are reserved for other threads,
- // and the rest is reserved for the caller thread;
- semaphore->available_count = Memory::Read32(guest_addr);
semaphore->name = std::move(name);
semaphore->guest_addr = guest_addr;
semaphore->mutex_addr = mutex_addr;
@@ -32,34 +29,36 @@ ResultVal<SharedPtr<Semaphore>> Semaphore::Create(VAddr guest_addr, VAddr mutex_
}
bool Semaphore::ShouldWait(Thread* thread) const {
- return available_count <= 0;
+ return GetAvailableCount() <= 0;
}
void Semaphore::Acquire(Thread* thread) {
- if (available_count <= 0)
+ if (GetAvailableCount() <= 0)
return;
- --available_count;
- UpdateGuestState();
+ SetAvailableCount(GetAvailableCount() - 1);
}
ResultCode Semaphore::Release(s32 target) {
- ++available_count;
- UpdateGuestState();
-
if (target == -1) {
// When -1, wake up all waiting threads
+ SetAvailableCount(GetWaitingThreads().size());
WakeupAllWaitingThreads();
} else {
// Otherwise, wake up just a single thread
+ SetAvailableCount(target);
WakeupWaitingThread(GetHighestPriorityReadyThread());
}
return RESULT_SUCCESS;
}
-void Semaphore::UpdateGuestState() {
- Memory::Write32(guest_addr, available_count);
+s32 Semaphore::GetAvailableCount() const {
+ return Memory::Read32(guest_addr);
+}
+
+void Semaphore::SetAvailableCount(s32 value) const {
+ Memory::Write32(guest_addr, value);
}
} // namespace Kernel
diff --git a/src/core/hle/kernel/semaphore.h b/src/core/hle/kernel/semaphore.h
index e80230cac..7254eb26d 100644
--- a/src/core/hle/kernel/semaphore.h
+++ b/src/core/hle/kernel/semaphore.h
@@ -13,6 +13,7 @@
namespace Kernel {
+// TODO(Subv): This is actually a Condition Variable.
class Semaphore final : public WaitObject {
public:
/**
@@ -39,8 +40,9 @@ public:
return HANDLE_TYPE;
}
- s32 max_count; ///< Maximum number of simultaneous holders the semaphore can have
- s32 available_count; ///< Number of free slots left in the semaphore
+ s32 GetAvailableCount() const;
+ void SetAvailableCount(s32 value) const;
+
std::string name; ///< Name of semaphore (optional)
VAddr guest_addr; ///< Address of the guest semaphore value
VAddr mutex_addr; ///< (optional) Address of guest mutex value associated with this semaphore,
@@ -59,9 +61,6 @@ public:
private:
Semaphore();
~Semaphore() override;
-
- /// Updates the state of the object tracking this semaphore in guest memory
- void UpdateGuestState();
};
} // namespace Kernel
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp
index a3ac3d782..d18d7a182 100644
--- a/src/core/hle/kernel/svc.cpp
+++ b/src/core/hle/kernel/svc.cpp
@@ -501,7 +501,7 @@ static ResultCode WaitProcessWideKeyAtomic(VAddr mutex_addr, VAddr semaphore_add
semaphore->name = Common::StringFromFormat("semaphore-%llx", semaphore_addr);
}
- ASSERT(semaphore->available_count == 0);
+ ASSERT(semaphore->GetAvailableCount() == 0);
ASSERT(semaphore->mutex_addr == mutex_addr);
auto wakeup_callback = [mutex, nano_seconds](ThreadWakeupReason reason,