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author | Subv <subv2112@gmail.com> | 2018-07-22 19:27:24 +0200 |
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committer | Subv <subv2112@gmail.com> | 2018-07-22 19:27:24 +0200 |
commit | 7841447cf07ee444f8f16674bf91ca3d25f07a42 (patch) | |
tree | ce4df133430ad807aaeeb9afbffa75df7f55e044 /src/core | |
parent | Merge pull request #638 from MerryMage/mp (diff) | |
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Diffstat (limited to 'src/core')
-rw-r--r-- | src/core/hle/kernel/svc.cpp | 38 |
1 files changed, 31 insertions, 7 deletions
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp index 6b2995fe2..7b41c9cfd 100644 --- a/src/core/hle/kernel/svc.cpp +++ b/src/core/hle/kernel/svc.cpp @@ -650,12 +650,27 @@ static ResultCode SignalProcessWideKey(VAddr condition_variable_addr, s32 target ASSERT(thread->condvar_wait_address == condition_variable_addr); - // If the mutex is not yet acquired, acquire it. - u32 mutex_val = Memory::Read32(thread->mutex_wait_address); + size_t current_core = Core::System::GetInstance().CurrentCoreIndex(); + + auto& monitor = Core::System::GetInstance().Monitor(); + + // Atomically read the value of the mutex. + u32 mutex_val = 0; + do { + monitor.SetExclusive(current_core, thread->mutex_wait_address); + + // If the mutex is not yet acquired, acquire it. + mutex_val = Memory::Read32(thread->mutex_wait_address); + + if (mutex_val != 0) { + monitor.ClearExclusive(); + break; + } + } while (!monitor.ExclusiveWrite32(current_core, thread->mutex_wait_address, + thread->wait_handle)); if (mutex_val == 0) { // We were able to acquire the mutex, resume this thread. - Memory::Write32(thread->mutex_wait_address, thread->wait_handle); ASSERT(thread->status == ThreadStatus::WaitMutex); thread->ResumeFromWait(); @@ -668,7 +683,19 @@ static ResultCode SignalProcessWideKey(VAddr condition_variable_addr, s32 target thread->condvar_wait_address = 0; thread->wait_handle = 0; } else { - // Couldn't acquire the mutex, block the thread. + // Atomically signal that the mutex now has a waiting thread. + do { + monitor.SetExclusive(current_core, thread->mutex_wait_address); + + // Ensure that the mutex value is still what we expect. + u32 value = Memory::Read32(thread->mutex_wait_address); + // TODO(Subv): When this happens, the kernel just clears the exclusive state and + // retries the initial read for this thread. + ASSERT_MSG(mutex_val == value, "Unhandled synchronization primitive case"); + } while (!monitor.ExclusiveWrite32(current_core, thread->mutex_wait_address, + mutex_val | Mutex::MutexHasWaitersFlag)); + + // The mutex is already owned by some other thread, make this thread wait on it. Handle owner_handle = static_cast<Handle>(mutex_val & Mutex::MutexOwnerMask); auto owner = g_handle_table.Get<Thread>(owner_handle); ASSERT(owner); @@ -676,9 +703,6 @@ static ResultCode SignalProcessWideKey(VAddr condition_variable_addr, s32 target thread->status = ThreadStatus::WaitMutex; thread->wakeup_callback = nullptr; - // Signal that the mutex now has a waiting thread. - Memory::Write32(thread->mutex_wait_address, mutex_val | Mutex::MutexHasWaitersFlag); - owner->AddMutexWaiter(thread); Core::System::GetInstance().CpuCore(thread->processor_id).PrepareReschedule(); |