* doc/mach.texi (Message Receive): Document message semantics with
protected payloads.
---
doc/mach.texi | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/doc/mach.texi b/doc/mach.texi
index 26bf0c6..b3cc2ec 100644
--- a/doc/mach.texi
+++ b/doc/mach.texi
@@ -1949,6 +1949,25 @@ loses the receive right after the message was dequeued
from it, then
right still exists, but isn't held by the caller, then
@code{msgh_local_port} specifies @code{MACH_PORT_NULL}.
+Servers usually associate some state with a receive right. To that
+end, they might use a hash table to look up the state for the port a
+message was sent to. To optimize this, a task may associate an opaque
+@var{payload} with a receive right using the
+@code{mach_port_set_protected_payload} function. Once this is done,
+the kernel will set the @code{msgh_protected_payload} field to
+@var{payload} when delivering a message to this right and indicate
+this by setting the local part of @code{msgh_bits} to
+@code{MACH_MSG_TYPE_PROTECTED_PAYLOAD}.
+
+The support for protected payloads was added to GNU Mach. To preserve
+binary compatibility, the @code{msgh_local_port} and
+@code{msgh_local_port} share the same location. This makes it
+possible to add the payload information without increasing the size of
+@code{mach_msg_header_t}. This is an implementation detail. Which
+field is valid is determined by the local part of the
+@code{msgh_bits}. Existing software is not affected. When a receive
+right is transferred to another task, its payload is cleared.
+
Received messages are stamped with a sequence number, taken from the
port from which the message was received. (Messages received from a
port set are stamped with a sequence number from the appropriate member
--
1.8.5.2
