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Gave asynchronous operations approximate POSIX signal semantics. This

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will enable us to cascade async operations, which is necessary in order to
properly support DNS.  (For example, an HTTP request may have to redirect
to a new location and will have to perform a new DNS lookup, so we can't
just rely on doing the name lookup at the time of parsing the initial
URL).

Anything other than HTTP is probably broken right now; I'll fix the others
up asap.
This commit is contained in:
Michael Brown
2007-01-15 08:49:10 +00:00
parent ec75b269d3
commit 4e20d73bb5
26 changed files with 656 additions and 248 deletions
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16
src/net/tcp/iscsi.c
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@@ -121,7 +121,7 @@ static void iscsi_done ( struct iscsi_session *iscsi, int rc ) {
iscsi->command = NULL;
/* Mark asynchronous operation as complete */
async_done ( &iscsi->aop, rc );
async_done ( &iscsi->async, rc );
}
/****************************************************************************
@@ -1208,10 +1208,11 @@ static struct tcp_operations iscsi_tcp_operations = {
*
* @v iscsi iSCSI session
* @v command SCSI command
* @ret aop Asynchronous operation for this SCSI command
* @v parent Parent asynchronous operation
* @ret rc Return status code
*/
struct async_operation * iscsi_issue ( struct iscsi_session *iscsi,
struct scsi_command *command ) {
int iscsi_issue ( struct iscsi_session *iscsi, struct scsi_command *command,
struct async *parent ) {
int rc;
assert ( iscsi->command == NULL );
@@ -1219,7 +1220,7 @@ struct async_operation * iscsi_issue ( struct iscsi_session *iscsi,
if ( iscsi->instant_rc ) {
/* Abort immediately rather than retrying */
iscsi_done ( iscsi, iscsi->instant_rc );
return iscsi->instant_rc;
} else if ( iscsi->status ) {
/* Session already open: issue command */
iscsi_start_command ( iscsi );
@@ -1231,11 +1232,12 @@ struct async_operation * iscsi_issue ( struct iscsi_session *iscsi,
0 ) ) != 0 ) {
DBGC ( iscsi, "iSCSI %p could not open TCP "
"connection: %s\n", iscsi, strerror ( rc ) );
iscsi_done ( iscsi, rc );
return rc;
}
}
return &iscsi->aop;
async_init ( &iscsi->async, &default_async_operations, parent );
return 0;
}
/**