Expand support for rwlocks to count read and write locks separately

All counters such as n_locked are now split into two: one for reads and one
for writes. Normal mutexes just use the write counters, whereas rwlocks now
use both the read and write counters as appropriate.

In order to display all this new data, rwlocks are now printed as two lines
in the summary table: the first is for the write counters and the second is
for the read counters. There is currently no way to print out the sum of
any two such counters, or order by this sum.

1 files changed, 15 insertions, 2 deletions

diff --git a/mutrace.in b/mutrace.in
index 93e49ae..9bfabe1 100755
--- a/mutrace.in
+++ b/mutrace.in
@@ -119,18 +119,31 @@ OPTIONS:
 
 ORDER COLUMN NAMES:
   id                              Mutex number
-  n-locked                        Total number of times mutex was locked
+  n-locked                        Total number of times mutex was locked for
+                                  writing
+  n-read-locked                   Total number of times mutex was locked for
+                                  reading
+  n-contended                     Total number of times mutex was contended for
+                                  writing
+  n-read-contended                Total number of times mutex was contended for
+                                  reading
   n-owner-changed                 Total number of times mutex ownership changed
-  n-contended                     Total number of times mutex was contested
   nsec-locked-total               Total time mutex was locked for writing
   nsec-locked-max                 Maximum time mutex was continuously locked for
                                   writing
   nsec-locked-avg                 Average time mutex was continuously locked for
                                   writing
+  nsec-read-locked-total          Total time mutex was locked for reading
+  nsec-read-locked-max            Maximum time mutex was continuously locked for
+                                  reading
+  nsec-read-locked-avg            Average time mutex was continuously locked for
+                                  reading
   nsec-contended-total            Total time mutex was contended for writing
   nsec-contended-avg              Average time mutex was continuously contended
                                   for writing
   nsec-read-contended-total       Total time mutex was contended for reading
+  nsec-read-contended-avg         Average time mutex was continuously contended
+                                  for reading
 EOF
                         exit 0
                         ;;