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Kernel/Synch: Do not attempt a reschedule on every syscall. 

Not all syscalls should cause reschedules, this commit attempts to remedy that, however, it still does not cover all cases.
This commit is contained in:
Subv 2017-01-01 11:57:02 -05:00
parent 8f6c3b5c20
commit 38a90882a4
2 changed files with 18 additions and 2 deletions
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1
src/core/hle/kernel/mutex.cpp
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@ -84,6 +84,7 @@ void Mutex::Release() {
if (lock_count == 0) {
holding_thread->held_mutexes.erase(this);
ResumeWaitingThread(this);
Core::System::GetInstance().PrepareReschedule();
}
}
}

19
src/core/hle/svc.cpp
View File

@ -248,6 +248,8 @@ static ResultCode SendSyncRequest(Kernel::Handle handle) {
LOG_TRACE(Kernel_SVC, "called handle=0x%08X(%s)", handle, session->GetName().c_str());
Core::System::GetInstance().PrepareReschedule();
// TODO(Subv): svcSendSyncRequest should put the caller thread to sleep while the server
// responds and cause a reschedule.
return session->SendSyncRequest();
@ -284,6 +286,8 @@ static ResultCode WaitSynchronization1(Kernel::Handle handle, s64 nano_seconds)
// Create an event to wake the thread up after the specified nanosecond delay has passed
thread->WakeAfterDelay(nano_seconds);
Core::System::GetInstance().PrepareReschedule();
// Note: The output of this SVC will be set to RESULT_SUCCESS if the thread
// resumes due to a signal in its wait objects.
// Otherwise we retain the default value of timeout.
@ -366,6 +370,8 @@ static ResultCode WaitSynchronizationN(s32* out, Kernel::Handle* handles, s32 ha
// Create an event to wake the thread up after the specified nanosecond delay has passed
thread->WakeAfterDelay(nano_seconds);
Core::System::GetInstance().PrepareReschedule();
// This value gets set to -1 by default in this case, it is not modified after this.
*out = -1;
// Note: The output of this SVC will be set to RESULT_SUCCESS if the thread resumes due to
@ -414,6 +420,8 @@ static ResultCode WaitSynchronizationN(s32* out, Kernel::Handle* handles, s32 ha
// Create an event to wake the thread up after the specified nanosecond delay has passed
thread->WakeAfterDelay(nano_seconds);
Core::System::GetInstance().PrepareReschedule();
// Note: The output of this SVC will be set to RESULT_SUCCESS if the thread resumes due to a
// signal in one of its wait objects.
// Otherwise we retain the default value of timeout, and -1 in the out parameter
@ -448,6 +456,9 @@ static ResultCode ArbitrateAddress(Kernel::Handle handle, u32 address, u32 type,
auto res = arbiter->ArbitrateAddress(static_cast<Kernel::ArbitrationType>(type), address, value,
nanoseconds);
// TODO(Subv): Identify in which specific cases this call should cause a reschedule.
Core::System::GetInstance().PrepareReschedule();
return res;
}
@ -574,6 +585,8 @@ static ResultCode CreateThread(Kernel::Handle* out_handle, s32 priority, u32 ent
CASCADE_RESULT(*out_handle, Kernel::g_handle_table.Create(std::move(thread)));
Core::System::GetInstance().PrepareReschedule();
LOG_TRACE(Kernel_SVC, "called entrypoint=0x%08X (%s), arg=0x%08X, stacktop=0x%08X, "
"threadpriority=0x%08X, processorid=0x%08X : created handle=0x%08X",
entry_point, name.c_str(), arg, stack_top, priority, processor_id, *out_handle);
@ -586,6 +599,7 @@ static void ExitThread() {
LOG_TRACE(Kernel_SVC, "called, pc=0x%08X", Core::CPU().GetPC());
Kernel::ExitCurrentThread();
Core::System::GetInstance().PrepareReschedule();
}
/// Gets the priority for the specified thread
@ -605,6 +619,7 @@ static ResultCode SetThreadPriority(Kernel::Handle handle, s32 priority) {
return ERR_INVALID_HANDLE;
thread->SetPriority(priority);
Core::System::GetInstance().PrepareReschedule();
return RESULT_SUCCESS;
}
@ -849,6 +864,8 @@ static void SleepThread(s64 nanoseconds) {
// Create an event to wake the thread up after the specified nanosecond delay has passed
Kernel::GetCurrentThread()->WakeAfterDelay(nanoseconds);
Core::System::GetInstance().PrepareReschedule();
}
/// This returns the total CPU ticks elapsed since the CPU was powered-on
@ -1184,8 +1201,6 @@ void CallSVC(u32 immediate) {
if (info) {
if (info->func) {
info->func();
// TODO(Subv): Not all service functions should cause a reschedule in all cases.
Core::System::GetInstance().PrepareReschedule();
} else {
LOG_ERROR(Kernel_SVC, "unimplemented SVC function %s(..)", info->name);
}