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am 66317770: cutils: trace: add asynchronous events

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* commit '66317770d37c012b12609defdc750304c97bd8d3':
  cutils: trace: add asynchronous events
This commit is contained in:
Alex Ray 2013-03-19 00:29:05 +00:00 • committed by Android Git Automerger
commit ee2dccf21b
1 changed files with 41 additions and 0 deletions
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41
include/cutils/trace.h
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@ -181,6 +181,47 @@ static inline void atrace_end(uint64_t tag)
} }
} }
/**
* 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. * Traces an integer counter value. name is used to identify the counter.
* This can be used to track how a value changes over time. * This can be used to track how a value changes over time.