Add tracing header

/*

 * Copyright (C) 2015 The Android Open Source Project

 *

 * 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.

 */

#ifndef ANDROID_NATIVE_TRACE_H

#define ANDROID_NATIVE_TRACE_H

#include <stdbool.h>

#ifdef __cplusplus

extern "C" {

#endif

/**

 * Returns true if tracing is enabled. Use this signal to avoid expensive computation only necessary

 * when tracing is enabled.

 */

bool ATrace_isEnabled();

/**

 * Writes a tracing message to indicate that the given section of code has begun. This call must be

 * followed by a corresponding call to endSection() on the same thread.

 *

 * Note: At this time the vertical bar character '|' and newline character '\n' are used internally

 * by the tracing mechanism. If sectionName contains these characters they will be replaced with a

 * space character in the trace.

 */

void ATrace_beginSection(const char* sectionName);

/**

 * Writes a tracing message to indicate that a given section of code has ended. This call must be

 * preceeded by a corresponding call to beginSection(char*) on the same thread. Calling this method

 * will mark the end of the most recently begun section of code, so care must be taken to ensure

 * that beginSection / endSection pairs are properly nested and called from the same thread.

 */

void ATrace_endSection();

#ifdef __cplusplus

};

#endif

#endif // ANDROID_NATIVE_TRACE_H