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EndPointStateLwIP.cpp
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/*
*
* Copyright (c) 2023 Project CHIP Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <inet/EndPointStateLwIP.h>
#include <lwip/sys.h>
#include <lwip/tcpip.h>
#include <platform/LockTracker.h>
namespace chip {
namespace Inet {
err_t EndPointStateLwIP::RunOnTCPIPRet(std::function<err_t()> fn)
{
assertChipStackLockedByCurrentThread();
#if LWIP_TCPIP_CORE_LOCKING
err_t err;
LOCK_TCPIP_CORE();
err = fn();
UNLOCK_TCPIP_CORE();
return err;
#else
// Post a message to the TCPIP task and wait for it to run.
static sys_sem_t sTCPIPSem;
static bool sTCPIPSemInited = false;
if (!sTCPIPSemInited)
{
err_t err = sys_sem_new(&sTCPIPSem, 0);
if (err != ERR_OK)
{
return err;
}
sTCPIPSemInited = true;
}
// tcpip_callback takes a C function pointer, so we can't pass a capturing lambda to it.
// Just store the state the function we pass to it needs in statics.
// This should be safe, since that function will execute before we return and there is no
// re-entry into this method.
static std::function<err_t()> sTCPIPFunction;
static err_t sTCPIPFunctionResult;
VerifyOrDie(sTCPIPFunction == nullptr);
sTCPIPFunction = fn;
const err_t err = tcpip_callback(
[](void * aCtx) {
sTCPIPFunctionResult = sTCPIPFunction();
sys_sem_signal(&sTCPIPSem);
},
nullptr);
if (err != ERR_OK)
{
return err;
}
sys_arch_sem_wait(&sTCPIPSem, 0);
sTCPIPFunction = nullptr;
return sTCPIPFunctionResult;
#endif
}
void EndPointStateLwIP::RunOnTCPIP(std::function<void()> fn)
{
VerifyOrDie(RunOnTCPIPRet([&fn]() {
fn();
return ERR_OK;
}) == ERR_OK);
}
} // namespace Inet
} // namespace chip