Atmosphere/libraries/libstratosphere/source/os/impl/os_inter_process_event.cpp

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "os_inter_process_event.hpp"
namespace ams::os::impl {
namespace {
Result CreateEventHandles(Handle *out_readable, Handle *out_writable) {
/* Create the event handles. */
R_TRY_CATCH(svcCreateEvent(out_writable, out_readable)) {
R_CONVERT(svc::ResultOutOfResource, ResultOutOfResource());
} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
return ResultSuccess();
}
}
InterProcessEvent::InterProcessEvent(bool autoclear) : is_initialized(false) {
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R_ABORT_UNLESS(this->Initialize(autoclear));
}
InterProcessEvent::~InterProcessEvent() {
this->Finalize();
}
Result InterProcessEvent::Initialize(bool autoclear) {
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AMS_ABORT_UNLESS(!this->is_initialized);
Handle rh, wh;
R_TRY(CreateEventHandles(&rh, &wh));
this->Initialize(rh, true, wh, true, autoclear);
return ResultSuccess();
}
void InterProcessEvent::Initialize(Handle read_handle, bool manage_read_handle, Handle write_handle, bool manage_write_handle, bool autoclear) {
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AMS_ABORT_UNLESS(!this->is_initialized);
AMS_ABORT_UNLESS(read_handle != INVALID_HANDLE || write_handle != INVALID_HANDLE);
this->read_handle = read_handle;
this->manage_read_handle = manage_read_handle;
this->write_handle = write_handle;
this->manage_write_handle = manage_write_handle;
this->auto_clear = autoclear;
this->is_initialized = true;
}
Handle InterProcessEvent::DetachReadableHandle() {
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AMS_ABORT_UNLESS(this->is_initialized);
const Handle handle = this->read_handle;
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AMS_ABORT_UNLESS(handle != INVALID_HANDLE);
this->read_handle = INVALID_HANDLE;
this->manage_read_handle = false;
return handle;
}
Handle InterProcessEvent::DetachWritableHandle() {
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AMS_ABORT_UNLESS(this->is_initialized);
const Handle handle = this->write_handle;
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AMS_ABORT_UNLESS(handle != INVALID_HANDLE);
this->write_handle = INVALID_HANDLE;
this->manage_write_handle = false;
return handle;
}
Handle InterProcessEvent::GetReadableHandle() const {
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AMS_ABORT_UNLESS(this->is_initialized);
return this->read_handle;
}
Handle InterProcessEvent::GetWritableHandle() const {
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AMS_ABORT_UNLESS(this->is_initialized);
return this->write_handle;
}
void InterProcessEvent::Finalize() {
if (this->is_initialized) {
if (this->manage_read_handle && this->read_handle != INVALID_HANDLE) {
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R_ABORT_UNLESS(svcCloseHandle(this->read_handle));
}
if (this->manage_write_handle && this->write_handle != INVALID_HANDLE) {
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R_ABORT_UNLESS(svcCloseHandle(this->write_handle));
}
}
this->read_handle = INVALID_HANDLE;
this->manage_read_handle = false;
this->write_handle = INVALID_HANDLE;
this->manage_write_handle = false;
this->is_initialized = false;
}
void InterProcessEvent::Signal() {
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R_ABORT_UNLESS(svcSignalEvent(this->GetWritableHandle()));
}
void InterProcessEvent::Reset() {
Handle handle = this->GetReadableHandle();
if (handle == INVALID_HANDLE) {
handle = this->GetWritableHandle();
}
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R_ABORT_UNLESS(svcClearEvent(handle));
}
void InterProcessEvent::Wait() {
const Handle handle = this->GetReadableHandle();
while (true) {
/* Continuously wait, until success. */
R_TRY_CATCH(svcWaitSynchronizationSingle(handle, std::numeric_limits<u64>::max())) {
R_CATCH(svc::ResultCancelled) { continue; }
} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
/* Clear, if we must. */
if (this->auto_clear) {
R_TRY_CATCH(svcResetSignal(handle)) {
/* Some other thread might have caught this before we did. */
R_CATCH(svc::ResultInvalidState) { continue; }
} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
}
return;
}
}
bool InterProcessEvent::TryWait() {
const Handle handle = this->GetReadableHandle();
if (this->auto_clear) {
/* Auto-clear. Just try to reset. */
return R_SUCCEEDED(svcResetSignal(handle));
} else {
/* Not auto-clear. */
while (true) {
/* Continuously wait, until success or timeout. */
R_TRY_CATCH(svcWaitSynchronizationSingle(handle, 0)) {
R_CATCH(svc::ResultTimedOut) { return false; }
R_CATCH(svc::ResultCancelled) { continue; }
} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
/* We succeeded, so we're signaled. */
return true;
}
}
}
bool InterProcessEvent::TimedWait(u64 ns) {
const Handle handle = this->GetReadableHandle();
TimeoutHelper timeout_helper(ns);
while (true) {
/* Continuously wait, until success or timeout. */
R_TRY_CATCH(svcWaitSynchronizationSingle(handle, timeout_helper.NsUntilTimeout())) {
R_CATCH(svc::ResultTimedOut) { return false; }
R_CATCH(svc::ResultCancelled) { continue; }
} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
/* Clear, if we must. */
if (this->auto_clear) {
R_TRY_CATCH(svcResetSignal(handle)) {
/* Some other thread might have caught this before we did. */
R_CATCH(svc::ResultInvalidState) { continue; }
} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
}
return true;
}
}
}