am 66317770: cutils: trace: add asynchronous events

    }

}

/**

 * Trace the beginning of an asynchronous event. Unlike ATRACE_BEGIN/ATRACE_END

 * contexts, asynchronous events do not need to be nested. The name describes

 * the event, and the cookie provides a unique identifier for distinguishing

 * simultaneous events. The name and cookie used to begin an event must be

 * used to end it.

 */

#define ATRACE_ASYNC_BEGIN(name, cookie) \

    atrace_async_begin(ATRACE_TAG, name, cookie)

static inline void atrace_async_begin(uint64_t tag, const char* name,

        int32_t cookie)

{

    if (CC_UNLIKELY(atrace_is_tag_enabled(tag))) {

        char buf[ATRACE_MESSAGE_LENGTH];

        size_t len;

        len = snprintf(buf, ATRACE_MESSAGE_LENGTH, "S|%d|%s|%d", getpid(),

                name, cookie);

        write(atrace_marker_fd, buf, len);

    }

}

/**

 * Trace the end of an asynchronous event.

 * This should have a corresponding ATRACE_ASYNC_BEGIN.

 */

#define ATRACE_ASYNC_END(name, cookie) atrace_async_end(ATRACE_TAG, name, cookie)

static inline void atrace_async_end(uint64_t tag, const char* name,

        int32_t cookie)

{

    if (CC_UNLIKELY(atrace_is_tag_enabled(tag))) {

        char buf[ATRACE_MESSAGE_LENGTH];

        size_t len;

        len = snprintf(buf, ATRACE_MESSAGE_LENGTH, "F|%d|%s|%d", getpid(),

                name, cookie);

        write(atrace_marker_fd, buf, len);

    }

}

/**

 * Traces an integer counter value.  name is used to identify the counter.

 * This can be used to track how a value changes over time.