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rmvq(9f) [php man page]

rmvq(9F)						   Kernel Functions for Drivers 						  rmvq(9F)

NAME
rmvq - remove a message from a queue SYNOPSIS
#include <sys/stream.h> void rmvq(queue_t *q, mblk_t *mp); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
q Queue containing the message to be removed. mp Message to remove. DESCRIPTION
rmvq() removes a message from a queue. A message can be removed from anywhere on a queue. To prevent modules and drivers from having to deal with the internals of message linkage on a queue, either rmvq() or getq(9F) should be used to remove a message from a queue. CONTEXT
rmvq() can be called from user or interrupt context. EXAMPLES
This code fragment illustrates how one may flush one type of message from a queue. In this case, only M_PROTO T_DATA_IND messages are flushed. For each message on the queue, if it is an M_PROTO message (line 8) of type T_DATA_IND (line 10), save a pointer to the next mes- sage (line 11), remove the T_DATA_IND message (line 12) and free it (line 13). Continue with the next message in the list (line 19). 1 mblk_t *mp, *nmp; 2 queue_t *q; 3 union T_primitives *tp; 4 5 /* Insert code here to protect queue and message block */ 6 mp = q->q_first; 7 while (mp) { 8 if (mp->b_datap->db_type == M_PROTO) { 9 tp = (union T_primitives *)mp->b_rptr; 10 if (tp->type == T_DATA_IND) { 11 nmp = mp->b_next; 12 rmvq(q, mp); 13 freemsg(mp); 14 mp = nmp; 15 } else { 16 mp = mp->b_next; 17 } 18 } else { 19 mp = mp->b_next; 20 } 21 } 22 /* End of region that must be protected */ When using rmvq(), you must ensure that the queue and the message block is not modified by another thread at the same time. You can achieve this either by using STREAMS functions or by implementing your own locking. SEE ALSO
freemsg(9F), getq(9F), insq(9F) Writing Device Drivers STREAMS Programming Guide WARNINGS
Make sure that the message mp is linked onto q to avoid a possible system panic. SunOS 5.10 9 Jul 2001 rmvq(9F)

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rmvq(9F)						   Kernel Functions for Drivers 						  rmvq(9F)

NAME
rmvq - remove a message from a queue SYNOPSIS
#include <sys/stream.h> void rmvq(queue_t *q, mblk_t *mp); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
q Queue containing the message to be removed. mp Message to remove. DESCRIPTION
rmvq() removes a message from a queue. A message can be removed from anywhere on a queue. To prevent modules and drivers from having to deal with the internals of message linkage on a queue, either rmvq() or getq(9F) should be used to remove a message from a queue. CONTEXT
rmvq() can be called from user or interrupt context. EXAMPLES
This code fragment illustrates how one may flush one type of message from a queue. In this case, only M_PROTO T_DATA_IND messages are flushed. For each message on the queue, if it is an M_PROTO message (line 8) of type T_DATA_IND (line 10), save a pointer to the next mes- sage (line 11), remove the T_DATA_IND message (line 12) and free it (line 13). Continue with the next message in the list (line 19). 1 mblk_t *mp, *nmp; 2 queue_t *q; 3 union T_primitives *tp; 4 5 /* Insert code here to protect queue and message block */ 6 mp = q->q_first; 7 while (mp) { 8 if (mp->b_datap->db_type == M_PROTO) { 9 tp = (union T_primitives *)mp->b_rptr; 10 if (tp->type == T_DATA_IND) { 11 nmp = mp->b_next; 12 rmvq(q, mp); 13 freemsg(mp); 14 mp = nmp; 15 } else { 16 mp = mp->b_next; 17 } 18 } else { 19 mp = mp->b_next; 20 } 21 } 22 /* End of region that must be protected */ When using rmvq(), you must ensure that the queue and the message block is not modified by another thread at the same time. You can achieve this either by using STREAMS functions or by implementing your own locking. SEE ALSO
freemsg(9F), getq(9F), insq(9F) Writing Device Drivers STREAMS Programming Guide WARNINGS
Make sure that the message mp is linked onto q to avoid a possible system panic. SunOS 5.10 9 Jul 2001 rmvq(9F)

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