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Modify data-xfer semantics: it is no longer necessary to call one of

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request(), seek() or deliver_xxx() in order to start the data flow.
Autonomous generators must be genuinely autonomous (having their own
process), or otherwise arrange to be called.  TCP does this by
starting the retry timer immediately.

Add some debugging statements.
This commit is contained in:
Michael Brown
2007-05-26 15:04:36 +00:00
parent 3601103381
commit 10d0a1f8c7
5 changed files with 96 additions and 41 deletions
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71
src/core/xfer.c
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@@ -35,6 +35,8 @@
void xfer_close ( struct xfer_interface *xfer, int rc ) {
struct xfer_interface *dest = xfer_get_dest ( xfer );
DBGC ( xfer, "XFER %p->%p close\n", xfer, dest );
dest->op->close ( dest, rc );
xfer_unplug ( xfer );
xfer_put ( dest );
@@ -52,7 +54,14 @@ int xfer_vredirect ( struct xfer_interface *xfer, int type, va_list args ) {
struct xfer_interface *dest = xfer_get_dest ( xfer );
int rc;
DBGC ( xfer, "XFER %p->%p redirect\n", xfer, dest );
rc = dest->op->vredirect ( dest, type, args );
if ( rc != 0 ) {
DBGC ( xfer, "XFER %p<-%p redirect: %s\n", xfer, dest,
strerror ( rc ) );
}
xfer_put ( dest );
return rc;
}
@@ -89,21 +98,19 @@ int xfer_request ( struct xfer_interface *xfer, off_t offset, int whence,
struct xfer_interface *dest = xfer_get_dest ( xfer );
int rc;
DBGC ( xfer, "XFER %p->%p request %s+%ld %zd\n", xfer, dest,
whence_text ( whence ), offset, len );
rc = dest->op->request ( dest, offset, whence, len );
if ( rc != 0 ) {
DBGC ( xfer, "XFER %p<-%p request: %s\n", xfer, dest,
strerror ( rc ) );
}
xfer_put ( dest );
return rc;
}
/**
* Request all data
*
* @v xfer Data transfer interface
* @ret rc Return status code
*/
int xfer_request_all ( struct xfer_interface *xfer ) {
return xfer_request ( xfer, 0, SEEK_SET, ~( ( size_t ) 0 ) );
}
/**
* Seek to position
*
@@ -116,11 +123,33 @@ int xfer_seek ( struct xfer_interface *xfer, off_t offset, int whence ) {
struct xfer_interface *dest = xfer_get_dest ( xfer );
int rc;
DBGC ( xfer, "XFER %p->%p seek %s+%ld\n", xfer, dest,
whence_text ( whence ), offset );
rc = dest->op->seek ( dest, offset, whence );
if ( rc != 0 ) {
DBGC ( xfer, "XFER %p<-%p seek: %s\n", xfer, dest,
strerror ( rc ) );
}
xfer_put ( dest );
return rc;
}
/**
* Test to see if interface is ready to accept data
*
* @v xfer Data transfer interface
* @ret rc Return status code
*
* This test is optional; the data transfer interface may wish that it
* does not yet wish to accept data, but cannot prevent attempts to
* deliver data to it.
*/
int xfer_ready ( struct xfer_interface *xfer ) {
return xfer_seek ( xfer, 0, SEEK_CUR );
}
/**
* Allocate I/O buffer
*
@@ -132,7 +161,13 @@ struct io_buffer * xfer_alloc_iob ( struct xfer_interface *xfer, size_t len ) {
struct xfer_interface *dest = xfer_get_dest ( xfer );
struct io_buffer *iobuf;
DBGC ( xfer, "XFER %p->%p alloc_iob %zd\n", xfer, dest, len );
iobuf = dest->op->alloc_iob ( dest, len );
if ( ! iobuf ) {
DBGC ( xfer, "XFER %p<-%p alloc_iob failed\n", xfer, dest );
}
xfer_put ( dest );
return iobuf;
}
@@ -148,7 +183,15 @@ int xfer_deliver_iob ( struct xfer_interface *xfer, struct io_buffer *iobuf ) {
struct xfer_interface *dest = xfer_get_dest ( xfer );
int rc;
DBGC ( xfer, "XFER %p->%p deliver_iob %zd\n", xfer, dest,
iob_len ( iobuf ) );
rc = dest->op->deliver_iob ( dest, iobuf );
if ( rc != 0 ) {
DBGC ( xfer, "XFER %p<-%p deliver_iob: %s\n", xfer, dest,
strerror ( rc ) );
}
xfer_put ( dest );
return rc;
}
@@ -165,7 +208,15 @@ int xfer_deliver_raw ( struct xfer_interface *xfer,
struct xfer_interface *dest = xfer_get_dest ( xfer );
int rc;
DBGC ( xfer, "XFER %p->%p deliver_raw %p+%zd\n", xfer, dest,
data, len );
rc = dest->op->deliver_raw ( dest, data, len );
if ( rc != 0 ) {
DBGC ( xfer, "XFER %p<-%p deliver_raw: %s\n", xfer, dest,
strerror ( rc ) );
}
xfer_put ( dest );
return rc;
}