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flushband(9f) [minix man page]

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

flushband - flush messages for a specified priority band SYNOPSIS
#include <sys/stream.h> void flushband(queue_t *q, unsigned char pri, int flag); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
q Pointer to the queue. pri Priority of messages to be flushed. flag Valid flag values are: FLUSHDATA Flush only data messages (types M_DATA, M_DELAY, M_PROTO, and M_PCPROTO ). FLUSHALL Flush all messages. DESCRIPTION
flushband() flushes messages associated with the priority band specified by pri. If pri is 0, only normal and high priority messages are flushed. Otherwise, messages are flushed from the band pri according to the value of flag. CONTEXT
flushband() can be called from user or interrupt context. SEE ALSO
flushq(9F) Writing Device Drivers STREAMS Programming Guide SunOS 5.10 11 Apr 1991 flushband(9F)

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

flushq - remove messages from a queue SYNOPSIS
#include <sys/stream.h> void flushq(queue_t *q, int flag); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
q Pointer to the queue to be flushed. flag Valid flag values are: FLUSHDATA Flush only data messages (types M_DATA M_DELAY M_PROTO and M_PCPROTO). FLUSHALL Flush all messages. DESCRIPTION
flushq() frees messages and their associated data structures by calling freemsg(9F). If the queue's count falls below the low water mark and the queue was blocking an upstream service procedure, the nearest upstream service procedure is enabled. CONTEXT
flushq() can be called from user or interrupt context. EXAMPLES
Example 1: Using flushq() This example depicts the canonical flushing code for STREAMS modules. The module has a write service procedure and potentially has messages on the queue. If it receives an M_FLUSH message, and if the FLUSHR bit is on in the first byte of the message (line 10), then the read queue is flushed (line 11). If the FLUSHW bit is on (line 12), then the write queue is flushed (line 13). Then the message is passed along to the next entity in the stream (line 14). See the example for qreply(9F) for the canonical flushing code for drivers. 1 /* 2 * Module write-side put procedure. 3 */ 4 xxxwput(q, mp) 5 queue_t *q; 6 mblk_t *mp; 7 { 8 switch(mp->b_datap->db_type) { 9 case M_FLUSH: 10 if (*mp->b_rptr & FLUSHR) 11 flushq(RD(q), FLUSHALL); 12 if (*mp->b_rptr & FLUSHW) 13 flushq(q, FLUSHALL); 14 putnext(q, mp); 15 break; . . . 16 } 17 } SEE ALSO
flushband(9F), freemsg(9F), putq(9F), qreply(9F) Writing Device Drivers STREAMS Programming Guide SunOS 5.10 11 Apr 1991 flushq(9F)
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