fix original problem with bt_deletekey, obviating need for btree2t.c

[btree] / README.md

diff --git a/README.md b/README.md
index 37383fc1e66481ead5d43fc85b40c6a0e438b3a3..c0de3d65bc6ce030aedd0f1ab3c7f21c3cf34a50 100644 (file)
--- a/README.md
+++ b/README.md
@@ -3,16 +3,25 @@ Btree-source-code
 
 A working project for High-concurrency B-tree source code in C
 
-There are three major code sets in the btree source code:
+There are four major code sets in the standard btree source code:
 
-btree2q.c       Single Threaded/MultiProcess with latching supplied by advisory file locking.  Works with network file systems.
-threads2h.c     Multi-Threaded/Multi-Process with latching implemented with test & set locks in the btree pages.
+btree2s.c       Single Threaded/MultiProcess with latching supplied by advisory file locking.  Works with network file systems.  Only deletes leaf level pages.
 
-The Foster set includes three types of latching:
+btree2t.c       Single Threaded/MultiProcess version that removes keys all the way back to an original empty btree.
 
-Fosterbtreee.c  Multi-Threaded/Single Process with latches hosted by the buffer pool manager
-Fosterbtreef.c  Multi-Threaded/Multi-Process with latches hosted by a latch manager using the first few pages of the btree.
-Fosterbtreeg.c  Multi-Threaded/Multi-Process with latches implemented with test & set locks in the btree pages.
+threads2h.c     Multi-Threaded/Multi-Process with latching implemented by a latch manager with pthreads/SRW latches in the first few btree pages.
+
+threads2i.c     Multi-Threaded/Multi-Process with latching implemented by a latch manager with test & set latches  in the first few btree pages with thread yield system calls during contention.
+
+threads2j.c     Multi-Threaded/Multi-Process with latching implemented by a latch manager with test & set locks in the first few btree pages with Linux futex system calls during contention.
+
+The Foster code set includes the same three types of latching:
+
+Fosterbtreee.c  Multi-Threaded/Single Process with latching implemented by a latch manager with pthreads/SRW latches in the first few btree pages.
+
+Fosterbtreef.c  Multi-Threaded/Multi-Process with latching implemented by a latch manager with test & set latches  in the first few btree pages with thread yield  system calls during contention.
+
+Fosterbtreeg.c  Multi-Threaded/Multi-Process with latching implemented by a latch manager with test & set locks in the first few btree pages with Linux futex system calls during contention.
 
 Compilation is achieved on linux or Windows by:
 
@@ -20,6 +29,6 @@ gcc -D STANDALONE threads2h.c -lpthread
 
 or
 
-cl /D STANDALONE threads2h.c
+cl /Ox /D STANDALONE threads2h.c
 
 Please see the project wiki page for documentation