File content as of revision 61:9a84b5964019:

/**
 * Copyright (c) 2017, Arm Limited and affiliates.
 * SPDX-License-Identifier: Apache-2.0
 *
 * 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.
 */

/**
 * If we have tracing library available, we can see traces from within the
 * stack. The library could be made unavailable by removing FEATURE_COMMON_PAL
 * from the mbed_app.json to save RAM.
 */

#include "mbed_trace.h"

#ifdef FEA_TRACE_SUPPORT
#include "platform/PlatformMutex.h"

/**
 * Local mutex object for synchronization
 */
static PlatformMutex mutex;

static void serial_lock();
static void serial_unlock();

/**
 * Sets up trace for the application
 * Wouldn't do anything if the FEATURE_COMMON_PAL is not added
 * or if the trace is disabled using mbed_app.json
 */
void setup_trace()
{
    // setting up Mbed trace.
    mbed_trace_mutex_wait_function_set(serial_lock);
    mbed_trace_mutex_release_function_set(serial_unlock);
    mbed_trace_init();
}

/**
 * Lock provided for serial printing used by trace library
 */
static void serial_lock()
{
    mutex.lock();
}

/**
 * Releasing lock provided for serial printing used by trace library
 */
static void serial_unlock()
{
    mutex.unlock();
}
#else
void setup_trace()
{

}
#endif