From 66317770d37c012b12609defdc750304c97bd8d3 Mon Sep 17 00:00:00 2001
From: Alex Ray <aray@google.com>
Date: Sun, 17 Mar 2013 22:39:01 -0700
Subject: [PATCH] cutils: trace: add asynchronous events

Change-Id: Ia09d34cbc6c8c85fb3d0f1a7e95de53d1b79e998
---
 include/cutils/trace.h | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/include/cutils/trace.h b/include/cutils/trace.h
index 1db39038b..ad65dfba4 100644
--- a/include/cutils/trace.h
+++ b/include/cutils/trace.h
@@ -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.
  * This can be used to track how a value changes over time.