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Verified with a hwtest and implemented based on reverse engineering.
Thread A's priority will get bumped to the highest priority among all the threads that are waiting for a mutex that A holds.
Once A releases the mutex and ownership is transferred to B, A's priority will return to normal and B's priority will be bumped.
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Switch mutexes are no longer kernel objects, they are managed in userland and only use the kernel to handle the contention case.
Mutex addresses store a special flag value (0x40000000) to notify the guest code that there are still some threads waiting for the mutex to be released. This flag is updated when a thread calls ArbitrateUnlock.
TODO:
* Fix svcWaitProcessWideKey
* Fix svcSignalProcessWideKey
* Remove the Mutex class.
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starvation.
Ported from citra PR #3091
The delay specified here is from a Nintendo 3DS, and should be measured in a Nintendo Switch.
This change is enough to prevent Puyo Puyo Tetris's main thread starvation.
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svcGetInfo(AllowedCpuIdBitmask)
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This is kinda crufty, but we need it for now to update guest state variables.
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# Conflicts:
# src/core/CMakeLists.txt
# src/core/arm/dynarmic/arm_dynarmic.cpp
# src/core/arm/dyncom/arm_dyncom.cpp
# src/core/hle/kernel/process.cpp
# src/core/hle/kernel/thread.cpp
# src/core/hle/kernel/thread.h
# src/core/hle/kernel/vm_manager.cpp
# src/core/loader/3dsx.cpp
# src/core/loader/elf.cpp
# src/core/loader/ncch.cpp
# src/core/memory.cpp
# src/core/memory.h
# src/core/memory_setup.h
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Memory: Add overloads for ReadBlock and WriteBlock that operate on a specific process.
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Kernel/Threads: When putting a thread to wait, specify a function to execute when it is awoken
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when it is awoken.
This change makes for a clearer (less confusing) path of execution in the scheduler, now the code to execute when a thread awakes is closer to the code that puts the thread to sleep (WaitSynch1, WaitSynchN). It also allows us to implement the special wake up behavior of ReplyAndReceive without hacking up WaitObject::WakeupAllWaitingThreads.
If savestates are desired in the future, we can change this implementation to one similar to the CoreTiming event system, where we first register the callback functions at startup and assign their identifiers to the Thread callback variable instead of directly assigning a lambda to the wake up callback variable.
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creating it.
Don't automatically assume that Thread::Create will only be called when the parent process is currently scheduled. This assumption will be broken when applets or system modules are loaded.
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Now that HandleTable doesn't directly depend on WaitObject anymore, this
can be separated from the main kernel.h header.
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Don't yield execution in SleepThread(0) if there are no available threads to run
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available threads to run.
With this we avoid an useless temporary deschedule of the current thread.
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the objects that a thread is waiting on.
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WaitSynchronization1 and WaitSynchronizationN with wait_all = true.
This commit removes the overly general THREADSTATUS_WAIT_SYNCH and replaces it with two more granular statuses:
THREADSTATUS_WAIT_SYNCH_ANY when a thread waits on objects via WaitSynchronization1 or WaitSynchronizationN with wait_all = false.
THREADSTATUS_WAIT_SYNCH_ALL when a thread waits on objects via WaitSynchronizationN with wait_all = true.
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the priority via mutexes
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This will be useful when implementing mutex priority inheritance.
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Define a variable with the value of the sync timeout error code.
Use a boost::flat_map instead of an unordered_map to hold the equivalence of objects and wait indices in a WaitSynchN call.
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Threads will now be awakened when the objects they're waiting on are signaled, instead of repeating the WaitSynchronization call every now and then.
The scheduler is now called once after every SVC call, and once after a thread is awakened from sleep by its timeout callback.
This new implementation is based off reverse-engineering of the real kernel.
See https://gist.github.com/Subv/02f29bd9f1e5deb7aceea1e8f019c8f4 for a more detailed description of how the real kernel handles rescheduling.
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This makes clang-format useful on those.
Also add a bunch of forgotten transitive includes, which otherwise
prevented compilation.
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