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authorSubv <subv2112@gmail.com>2017-01-05 20:14:22 +0100
committerSubv <subv2112@gmail.com>2017-01-06 01:11:34 +0100
commitfc2266130b450952777cd3a9e47adb36960de8e7 (patch)
tree98c4540c61e35fb29e1572583bd54a6dee080c22
parentMerge pull request #2393 from Subv/synch (diff)
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-rw-r--r--src/core/hle/kernel/thread.cpp4
-rw-r--r--src/core/hle/kernel/thread.h5
-rw-r--r--src/core/hle/svc.cpp5
3 files changed, 14 insertions, 0 deletions
diff --git a/src/core/hle/kernel/thread.cpp b/src/core/hle/kernel/thread.cpp
index 9109bd10b..6cd9ff327 100644
--- a/src/core/hle/kernel/thread.cpp
+++ b/src/core/hle/kernel/thread.cpp
@@ -556,6 +556,10 @@ SharedPtr<Thread> SetupMainThread(u32 entry_point, s32 priority) {
return thread;
}
+bool HaveReadyThreads() {
+ return ready_queue.get_first() != nullptr;
+}
+
void Reschedule() {
PriorityBoostStarvedThreads();
diff --git a/src/core/hle/kernel/thread.h b/src/core/hle/kernel/thread.h
index af72b76ea..13a29a044 100644
--- a/src/core/hle/kernel/thread.h
+++ b/src/core/hle/kernel/thread.h
@@ -219,6 +219,11 @@ private:
SharedPtr<Thread> SetupMainThread(u32 entry_point, s32 priority);
/**
+ * Returns whether there are any threads that are ready to run.
+ */
+bool HaveReadyThreads();
+
+/**
* Reschedules to the next available thread (call after current thread is suspended)
*/
void Reschedule();
diff --git a/src/core/hle/svc.cpp b/src/core/hle/svc.cpp
index 855f3af82..50d35ab97 100644
--- a/src/core/hle/svc.cpp
+++ b/src/core/hle/svc.cpp
@@ -849,6 +849,11 @@ static ResultCode CancelTimer(Kernel::Handle handle) {
static void SleepThread(s64 nanoseconds) {
LOG_TRACE(Kernel_SVC, "called nanoseconds=%lld", nanoseconds);
+ // Don't attempt to yield execution if there are no available threads to run,
+ // this way we avoid a useless reschedule to the idle thread.
+ if (nanoseconds == 0 && !Kernel::HaveReadyThreads())
+ return;
+
// Sleep current thread and check for next thread to schedule
Kernel::WaitCurrentThread_Sleep();