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Added SENDREC_BUSY flag to indicate that process is doing sendrec() -

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if so, alerts are not received before reply message.
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Ben Gras 2005-07-27 14:08:59 +00:00
parent a1a7ccbd02
commit 31042a5a05
2 changed files with 7 additions and 2 deletions
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1
kernel/priv.h
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@ -41,6 +41,7 @@ struct priv {
#define RDY_Q_HEAD 0x02 /* add to queue head instead of tail */
#define BILLABLE 0x04 /* some processes are not billable */
#define SYS_PROC 0x10 /* system processes are privileged */
#define SENDREC_BUSY 0x20 /* sendrec() in progress */
/* Magic system structure table addresses. */
#define BEG_PRIV_ADDR (&priv[0])

8
kernel/proc.c
View file

@ -167,7 +167,8 @@ message *m_ptr; /* pointer to message in the caller's space */
* - ECHO: nonblocking call; directly echo back the message
*/
switch(function) {
case SENDREC: /* has FRESH_ANSWER flag */
case SENDREC:
caller_ptr->p_priv->s_flags |= SENDREC_BUSY;
/* fall through */
case SEND:
result = mini_send(caller_ptr, src_dst, m_ptr, flags);
@ -175,6 +176,8 @@ message *m_ptr; /* pointer to message in the caller's space */
break; /* done, or SEND failed */
} /* fall through for SENDREC */
case RECEIVE:
if(function == RECEIVE)
caller_ptr->p_priv->s_flags &= ~SENDREC_BUSY;
result = mini_receive(caller_ptr, src_dst, m_ptr, flags);
break;
case ALERT:
@ -275,7 +278,7 @@ unsigned flags; /* system call flags */
if (!(caller_ptr->p_rts_flags & SENDING)) {
/* Check if there are pending notifications, except for SENDREC. */
if (! (flags & FRESH_ANSWER)) {
if (! (caller_ptr->p_priv->s_flags & SENDREC_BUSY)) {
map = &priv(caller_ptr)->s_notify_pending;
for (chunk=&map->chunk[0]; chunk<&map->chunk[NR_SYS_CHUNKS]; chunk++) {
@ -363,6 +366,7 @@ int dst; /* which process to notify */
* can be both sending and receiving during a SENDREC system call.
*/
if ((dst_ptr->p_rts_flags & (RECEIVING|SENDING)) == RECEIVING &&
!(dst_ptr->p_priv->s_flags & SENDREC_BUSY) &&
(dst_ptr->p_getfrom == ANY || dst_ptr->p_getfrom == caller_ptr->p_nr)) {
/* Destination is indeed waiting for a message. Assemble a notification