A patch for [Yappi](http://code.google.com/p/yappi/) to measure CPU time instead of wall time

cputime.patch

From vi0oss@gmail.com Thu Feb 16 21:43:27 2012
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Subject: [PATCH] Switch between measuring wall-clock time and CPU time with
 YAPPI_CPUTIME environment variable
X-Mercurial-Node: f73ffd1c1bed66f0a95b39460788cc411ddc1003
Message-Id: <f73ffd1c1bed66f0a95b.1329417806@localhost>
User-Agent: Mercurial-patchbomb/1.6.4
Date: Thu, 16 Feb 2012 21:43:26 +0300
From: Vitaly _Vi Shukela <vi0oss@gmail.com>
To: Vitaly _Vi Shukela <vi0oss@gmail.com>

# HG changeset patch
# User Vitaly "_Vi" Shukela <vi0oss@gmail.com>
# Date 1329417671 -10800
# Node ID f73ffd1c1bed66f0a95b39460788cc411ddc1003
# Parent  64e2ad93ee9bc5bdb27f213739f9191b3507718a
Switch between measuring wall-clock time and CPU time with YAPPI_CPUTIME environment variable

diff --git a/_ytiming.c b/_ytiming.c
--- a/_ytiming.c
+++ b/_ytiming.c
@@ -35,11 +35,25 @@
 #include <sys/times.h>
 #endif
 
+int variant=0;
+
 long long
 tickcount(void)
 {
     struct timeval tv;
+    struct timespec tp;
+
+    if (!variant) {
+        if(getenv("YAPPI_CPUTIME")) {
+            variant=2;
+        } else {
+            variant=1;
+        }
+    }
+
     long long rc;
+    if(variant==1) {
+
 #ifdef GETTIMEOFDAY_NO_TZ
     gettimeofday(&tv);
 #else
@@ -47,6 +61,16 @@
 #endif
     rc = tv.tv_sec;
     rc = rc * 1000000 + tv.tv_usec;
+    
+    } else
+    if (variant==2) {
+
+    clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &tp);
+    rc = tp.tv_sec;
+    rc = rc * 1000000 + 0.001*tp.tv_nsec;
+
+    }
+
     return rc;
 }
 
diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@
             #define_macros=[('YDEBUG', '1')],
             #define_macros=[('DEBUG_CALL', '1')],
             #define_macros=[('DEBUG_MEM', '1')],		
-            #extra_link_args = ["-lrt"]
+            extra_link_args = ["-lrt"]
             #extra_compile_args = ["TEST"]
             #extra_compile_args = ["-E"]
         )