sys/sys/msgport2.h

   1 /*
   2  * SYS/MSGPORT2.H
   3  *
   4  *      Implements Inlines for LWKT messages and ports.
   5  *
   6  * $DragonFly: src/sys/sys/msgport2.h,v 1.17 2008/11/09 09:20:09 sephe Exp $
   7  */
   8
   9 #ifndef _SYS_MSGPORT2_H_
  10 #define _SYS_MSGPORT2_H_
  11
  12 #ifndef _KERNEL
  13
  14 #error "This file should not be included by userland programs."
  15
  16 #else
  17
  18 #ifndef _SYS_THREAD2_H_
  19 #include <sys/thread2.h>
  20 #endif
  21
  22 /*
  23  * Initialize a LWKT message structure.  Note that if the message supports
  24  * an abort MSGF_ABORTABLE must be passed in flags.
  25  *
  26  * Note that other areas of the LWKT msg may already be initialized, so we
  27  * do not zero the message here.
  28  *
  29  * Messages are marked as DONE until sent.
  30  */
  31 static __inline
  32 void
  33 lwkt_initmsg(lwkt_msg_t msg, lwkt_port_t rport, int flags)
  34 {
  35     msg->ms_flags = MSGF_DONE | flags;
  36     msg->ms_reply_port = rport;
  37 }
  38
  39 static __inline
  40 void
  41 lwkt_initmsg_abortable(lwkt_msg_t msg, lwkt_port_t rport, int flags,
  42                        void (*abortfn)(lwkt_msg_t))
  43 {
  44     lwkt_initmsg(msg, rport, flags | MSGF_ABORTABLE);
  45     msg->ms_abortfn = abortfn;
  46 }
  47
  48 static __inline
  49 int
  50 lwkt_beginmsg(lwkt_port_t port, lwkt_msg_t msg)
  51 {
  52     return(port->mp_putport(port, msg));
  53 }
  54
  55 static __inline
  56 void
  57 lwkt_replymsg(lwkt_msg_t msg, int error)
  58 {
  59     lwkt_port_t port;
  60
  61     msg->ms_error = error;
  62     port = msg->ms_reply_port;
  63     port->mp_replyport(port, msg);
  64 }
  65
  66 /*
  67  * Retrieve the next message from the port's message queue, return NULL
  68  * if no messages are pending.  The retrieved message will either be a
  69  * request or a reply based on the MSGF_REPLY bit.
  70  *
  71  * If the backend port is a thread port, the the calling thread MUST
  72  * own the port.
  73  */
  74 static __inline
  75 void *
  76 lwkt_getport(lwkt_port_t port)
  77 {
  78     return(port->mp_getport(port));
  79 }
  80
  81 static __inline
  82 void *
  83 lwkt_waitport(lwkt_port_t port, int flags)
  84 {
  85     return(port->mp_waitport(port, flags));
  86 }
  87
  88 static __inline
  89 int
  90 lwkt_waitmsg(lwkt_msg_t msg, int flags)
  91 {
  92     return(msg->ms_reply_port->mp_waitmsg(msg, flags));
  93 }
  94
  95
  96 static __inline
  97 int
  98 lwkt_checkmsg(lwkt_msg_t msg)
  99 {
 100     return(msg->ms_flags & MSGF_DONE);
 101 }
 102
 103 static __inline
 104 void
 105 lwkt_dropmsg(lwkt_msg_t msg)
 106 {
 107     lwkt_port_t port;
 108
 109     KKASSERT((msg->ms_flags & (MSGF_DROPABLE | MSGF_DONE | MSGF_QUEUED)) ==
 110              (MSGF_DROPABLE | MSGF_QUEUED));
 111     port = msg->ms_target_port;
 112     port->mp_dropmsg(port, msg);
 113 }
 114
 115 #endif  /* _KERNEL */
 116 #endif  /* _SYS_MSGPORT2_H_ */