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Merge pull request #439 from Subv/idle_thread_m

Threads: Use a dummy idle thread when no other are ready.
This commit is contained in:
bunnei 2015-01-07 20:45:05 -05:00
commit 91d96840ea
4 changed files with 47 additions and 2 deletions

View file

@ -5,6 +5,7 @@
#include "common/common_types.h"
#include "core/core.h"
#include "core/core_timing.h"
#include "core/settings.h"
#include "core/arm/disassembler/arm_disasm.h"
@ -23,7 +24,17 @@ ARM_Interface* g_sys_core = nullptr; ///< ARM11 system (OS) core
/// Run the core CPU loop
void RunLoop(int tight_loop) {
// If the current thread is an idle thread, then don't execute instructions,
// instead advance to the next event and try to yield to the next thread
if (Kernel::IsIdleThread(Kernel::GetCurrentThreadHandle())) {
LOG_TRACE(Core_ARM11, "Idling");
CoreTiming::Idle();
CoreTiming::Advance();
HLE::Reschedule(__func__);
} else {
g_app_core->Run(tight_loop);
}
HW::Update();
if (HLE::g_reschedule) {
Kernel::Reschedule();

View file

@ -124,6 +124,8 @@ bool LoadExec(u32 entry_point) {
// 0x30 is the typical main thread priority I've seen used so far
g_main_thread = Kernel::SetupMainThread(0x30);
// Setup the idle thread
Kernel::SetupIdleThread();
return true;
}

View file

@ -11,6 +11,7 @@
#include "common/thread_queue_list.h"
#include "core/core.h"
#include "core/core_timing.h"
#include "core/hle/hle.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/thread.h"
@ -34,6 +35,7 @@ public:
inline bool IsReady() const { return (status & THREADSTATUS_READY) != 0; }
inline bool IsWaiting() const { return (status & THREADSTATUS_WAIT) != 0; }
inline bool IsSuspended() const { return (status & THREADSTATUS_SUSPEND) != 0; }
inline bool IsIdle() const { return idle; }
ResultVal<bool> WaitSynchronization() override {
const bool wait = status != THREADSTATUS_DORMANT;
@ -69,6 +71,9 @@ public:
std::vector<Handle> waiting_threads;
std::string name;
/// Whether this thread is intended to never actually be executed, i.e. always idle
bool idle = false;
};
// Lists all thread ids that aren't deleted/etc.
@ -444,7 +449,14 @@ ResultCode SetThreadPriority(Handle handle, s32 priority) {
return RESULT_SUCCESS;
}
/// Sets up the primary application thread
Handle SetupIdleThread() {
Handle handle;
Thread* thread = CreateThread(handle, "idle", 0, THREADPRIO_LOWEST, THREADPROCESSORID_0, 0, 0);
thread->idle = true;
CallThread(thread);
return handle;
}
Handle SetupMainThread(s32 priority, int stack_size) {
Handle handle;
@ -497,6 +509,15 @@ void Reschedule() {
ResumeThreadFromWait(prev->GetHandle());
}
bool IsIdleThread(Handle handle) {
Thread* thread = g_handle_table.Get<Thread>(handle);
if (!thread) {
LOG_ERROR(Kernel, "Thread not found %u", handle);
return false;
}
return thread->IsIdle();
}
ResultCode GetThreadId(u32* thread_id, Handle handle) {
Thread* thread = g_handle_table.Get<Thread>(handle);
if (thread == nullptr)

View file

@ -104,6 +104,17 @@ ResultVal<u32> GetThreadPriority(const Handle handle);
/// Set the priority of the thread specified by handle
ResultCode SetThreadPriority(Handle handle, s32 priority);
/**
* Sets up the idle thread, this is a thread that is intended to never execute instructions,
* only to advance the timing. It is scheduled when there are no other ready threads in the thread queue
* and will try to yield on every call.
* @returns The handle of the idle thread
*/
Handle SetupIdleThread();
/// Whether the current thread is an idle thread
bool IsIdleThread(Handle thread);
/// Initialize threading
void ThreadingInit();