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WaitSynchronizationN: Improved comments

This commit is contained in:
bunnei 2015-01-18 02:16:54 -05:00
parent 6643673f28
commit 6deb1a0119
1 changed files with 12 additions and 7 deletions
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19
src/core/hle/svc.cpp
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@ -149,15 +149,20 @@ static Result WaitSynchronizationN(s32* out, Handle* handles, s32 handle_count,
bool wait_thread = !wait_all; bool wait_thread = !wait_all;
int handle_index = 0; int handle_index = 0;
// Handles pointer is invalid // Check if 'handles' is invalid
if (handles == nullptr) if (handles == nullptr)
return ResultCode(ErrorDescription::InvalidPointer, ErrorModule::Kernel, ErrorSummary::InvalidArgument, ErrorLevel::Permanent).raw; return ResultCode(ErrorDescription::InvalidPointer, ErrorModule::Kernel, ErrorSummary::InvalidArgument, ErrorLevel::Permanent).raw;
// Negative handle_count is invalid // NOTE: on real hardware, there is no nullptr check for 'out' (tested with firmware 4.4). If
// this happens, the running application will crash.
_assert_msg_(Kernel, out != nullptr, "invalid output pointer specified!");
// Check if 'handle_count' is invalid
if (handle_count < 0) if (handle_count < 0)
return ResultCode(ErrorDescription::OutOfRange, ErrorModule::OS, ErrorSummary::InvalidArgument, ErrorLevel::Usage).raw; return ResultCode(ErrorDescription::OutOfRange, ErrorModule::OS, ErrorSummary::InvalidArgument, ErrorLevel::Usage).raw;
// If handle_count is non-zero, iterate through them and wait the current thread on the objects // If 'handle_count' is non-zero, iterate through each handle and wait the current thread if
// necessary
if (handle_count != 0) { if (handle_count != 0) {
bool selected = false; // True once an object has been selected bool selected = false; // True once an object has been selected
for (int i = 0; i < handle_count; ++i) { for (int i = 0; i < handle_count; ++i) {
@ -167,7 +172,7 @@ static Result WaitSynchronizationN(s32* out, Handle* handles, s32 handle_count,
ResultVal<bool> wait = object->Wait(true); ResultVal<bool> wait = object->Wait(true);
// Check if the current thread should wait on the object... // Check if the current thread should wait on this object...
if (wait.Succeeded() && *wait) { if (wait.Succeeded() && *wait) {
// Check we are waiting on all objects... // Check we are waiting on all objects...
if (wait_all) if (wait_all)
@ -184,15 +189,15 @@ static Result WaitSynchronizationN(s32* out, Handle* handles, s32 handle_count,
} }
} }
} else { } else {
// If no handles were passed in, put the thread to sleep only when wait_all=false // If no handles were passed in, put the thread to sleep only when 'wait_all' is false
// NOTE: This is supposed to deadlock the current thread if no timeout was specified // NOTE: This should deadlock the current thread if no timeout was specified
if (!wait_all) { if (!wait_all) {
wait_thread = true; wait_thread = true;
Kernel::WaitCurrentThread(WAITTYPE_SLEEP); Kernel::WaitCurrentThread(WAITTYPE_SLEEP);
} }
} }
// If thread should block, then set its state to waiting and then reschedule... // If thread should wait, then set its state to waiting and then reschedule...
if (wait_thread) { if (wait_thread) {
// Create an event to wake the thread up after the specified nanosecond delay has passed // Create an event to wake the thread up after the specified nanosecond delay has passed
Kernel::WakeThreadAfterDelay(Kernel::GetCurrentThread(), nano_seconds); Kernel::WakeThreadAfterDelay(Kernel::GetCurrentThread(), nano_seconds);