[MEDIUM] introduce pipe pools
A new data type has been added : pipes. Some pre-allocated empty pipes
are maintained in a pool for users such as splice which use them a lot
for very short times.
Pipes are allocated using get_pipe() and released using put_pipe().
Pipes which are released with pending data are immediately killed.
The struct pipe is small (16 to 20 bytes) and may even be further
reduced by unifying ->data and ->next.
It would be nice to have a dedicated cleanup task which would watch
for the pipes usage and destroy a few of them from time to time.
diff --git a/include/types/pipe.h b/include/types/pipe.h
new file mode 100644
index 0000000..12a1eee
--- /dev/null
+++ b/include/types/pipe.h
@@ -0,0 +1,45 @@
+/*
+ include/types/pipe.h
+ Pipe management.
+
+ Copyright (C) 2000-2009 Willy Tarreau - w@1wt.eu
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation, version 2.1
+ exclusively.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+#ifndef _TYPES_PIPE_H
+#define _TYPES_PIPE_H
+
+#include <common/config.h>
+
+/* A pipe is described by its read and write FDs, and the data remaining in it.
+ * The FDs are valid if there are data pending. The user is not allowed to
+ * change the FDs.
+ */
+struct pipe {
+ int data; /* number of bytes present in the pipe */
+ int prod; /* FD the producer must write to ; -1 if none */
+ int cons; /* FD the consumer must read from ; -1 if none */
+ struct pipe *next;
+};
+
+#endif /* _TYPES_PIPE_H */
+
+/*
+ * Local variables:
+ * c-indent-level: 8
+ * c-basic-offset: 8
+ * End:
+ */