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[commtech] Avoid if in bqv2 

Uses 2 send() function in order to avoid the end of buffer test and the
mapping test.
This commit is contained in:
Thomas Preud'homme 2011-06-06 13:34:01 +02:00 committed by Thomas Preud'homme
parent a20c9a8a21
commit 2c228612e5
1 changed files with 36 additions and 16 deletions
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52
communication_techniques/include/batch_queue_common_comm.h
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@ -24,29 +24,38 @@ struct channel
void * volatile *receiver_ptr __attribute__ ((aligned (CACHE_LINE_SIZE))); void * volatile *receiver_ptr __attribute__ ((aligned (CACHE_LINE_SIZE)));
}; };
void send1(struct channel *channel, void **addr)
__attribute__ ((visibility ("hidden")));
void send2(struct channel *channel, void **addr)
__attribute__ ((visibility ("hidden")));
#ifndef _BATCH_QUEUE_C_ #ifndef _BATCH_QUEUE_C_
#ifndef PAGE_SIZE_HELPER #ifndef PAGE_SIZE_HELPER
#define PAGE_SIZE_HELPER 1 #define PAGE_SIZE_HELPER 1
uintptr_t _bq_page_mask; void * volatile *_bq_end_buf1;
void * volatile *_bq_end_buf2;
void (*send_ptr)(struct channel *, void **);
void *create_comm_channel_internal(void); void *create_comm_channel_internal(void);
static void *create_comm_channel_helper(void) __attribute__ ((unused)); static void *create_comm_channel_helper(void) __attribute__ ((unused));
static void *create_comm_channel_helper(void) static void *create_comm_channel_helper(void)
{ {
int ret;
struct channel *channel; struct channel *channel;
ret = sysconf(_SC_PAGESIZE); send_ptr = &send1;
if (ret == -1)
return NULL;
_bq_page_mask = ~(ret - 1);
channel = create_comm_channel_internal(); channel = create_comm_channel_internal();
channel->buf_mask = sizeof channel->buf[0] - 1; _bq_end_buf1 = channel->buf[0] +
(sizeof channel->buf[0] / sizeof channel->buf[0][0]);
_bq_end_buf2 = channel->mapping2->buf[1] +
(sizeof channel->buf[1] / sizeof channel->buf[1][0]);
return channel; return channel;
} }
#else #else
extern unsigned int _bq_page_mask; extern uintptr_t _bq_end_buf1;
extern uintptr_t _bq_end_buf2;
extern void (*send_ptr)(struct channel *, void **);
#endif /* PAGE_SIZE_HELPER */ #endif /* PAGE_SIZE_HELPER */
#define create_comm_channel() create_comm_channel_helper() #define create_comm_channel() create_comm_channel_helper()
@ -55,19 +64,30 @@ __BEGIN_DECLS
static inline void send(struct channel *channel, void **addr) static inline void send(struct channel *channel, void **addr)
{ {
uintptr_t sender_ptr_high; (*send_ptr)(channel, addr);
}
void send1(struct channel *channel, void **addr)
{
*channel->sender_ptr++ = addr; *channel->sender_ptr++ = addr;
if (unlikely(!((uintptr_t) channel->sender_ptr & channel->buf_mask))) if (unlikely(channel->sender_ptr == _bq_end_buf1))
{ {
while (channel->state); while (channel->state);
channel->state = 1; channel->state = 1;
sender_ptr_high = channel->sender_ptr = channel->mapping2->buf[1];
(uintptr_t) channel->sender_ptr & _bq_page_mask; send_ptr = &send2;
if ((void *) sender_ptr_high == channel->mapping1) }
channel->sender_ptr = channel->mapping2->buf[1]; }
else
channel->sender_ptr = channel->mapping1->buf[0]; void send2(struct channel *channel, void **addr)
{
*channel->sender_ptr++ = addr;
if (unlikely(channel->sender_ptr == _bq_end_buf2))
{
while (channel->state);
channel->state = 1;
channel->sender_ptr = channel->buf[0];
send_ptr = &send1;
} }
} }