From c39414002f0f17ff984bcb84e1dcfb3178f0e04a Mon Sep 17 00:00:00 2001
From: Michael Lotz <mmlr@mlotz.ch>
Date: Sat, 5 Sep 2009 01:16:56 +0000
Subject: [PATCH] Give an IORequest user the possibility to suppress child
 finish notifications. This allows for synchronous uses where subrequests are
 forked off and waited on.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32936 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 src/system/kernel/device_manager/IORequest.cpp | 12 ++++++++++--
 src/system/kernel/device_manager/IORequest.h   |  5 +++++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/system/kernel/device_manager/IORequest.cpp b/src/system/kernel/device_manager/IORequest.cpp
index fef0fa7914..985e70f3db 100644
--- a/src/system/kernel/device_manager/IORequest.cpp
+++ b/src/system/kernel/device_manager/IORequest.cpp
@@ -653,7 +653,8 @@ IORequest::Init(off_t offset, size_t firstVecOffset, const iovec* vecs,
 	fTeam = thread->team->id;
 	fThread = thread->id;
 	fIsWrite = write;
-	fPartialTransfer = 0;
+	fPartialTransfer = false;
+	fSuppressChildNotifications = false;
 
 	// these are for iteration
 	fVecIndex = 0;
@@ -936,7 +937,7 @@ IORequest::SubRequestFinished(IORequest* request, status_t status,
 	if (status != B_OK && fStatus == 1)
 		fStatus = status;
 
-	if (--fPendingChildren > 0)
+	if (--fPendingChildren > 0 || fSuppressChildNotifications)
 		return;
 
 	// last child finished
@@ -972,6 +973,13 @@ IORequest::SetTransferredBytes(bool partialTransfer, size_t transferredBytes)
 }
 
 
+void
+IORequest::SetSuppressChildNotifications(bool suppress)
+{
+	fSuppressChildNotifications = suppress;
+}
+
+
 void
 IORequest::Advance(size_t bySize)
 {
diff --git a/src/system/kernel/device_manager/IORequest.h b/src/system/kernel/device_manager/IORequest.h
index 41f5ee42cd..6df985d399 100644
--- a/src/system/kernel/device_manager/IORequest.h
+++ b/src/system/kernel/device_manager/IORequest.h
@@ -264,6 +264,10 @@ struct IORequest : IORequestChunk, DoublyLinkedListLinkImpl<IORequest> {
 			void				SetTransferredBytes(bool partialTransfer,
 									size_t transferredBytes);
 
+			void				SetSuppressChildNotifications(bool suppress);
+			bool				SuppressChildNotifications() const
+									{ return fSuppressChildNotifications; }
+
 			bool				IsWrite() const	{ return fIsWrite; }
 			bool				IsRead() const	{ return !fIsWrite; }
 			team_id				Team() const	{ return fTeam; }
@@ -325,6 +329,7 @@ private:
 			thread_id			fThread;
 			bool				fIsWrite;
 			bool				fPartialTransfer;
+			bool				fSuppressChildNotifications;
 
 			io_request_finished_callback	fFinishedCallback;
 			void*				fFinishedCookie;