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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.
rebased_bqv2_avoid_if
Thomas Preud'homme 10 years ago
committed by Thomas Preud'homme
parent
commit
2c228612e5
1 changed files with 36 additions and 16 deletions
  1. +36
    -16
      communication_techniques/include/batch_queue_common_comm.h

+ 36
- 16
communication_techniques/include/batch_queue_common_comm.h View File

@ -24,29 +24,38 @@ struct channel
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 PAGE_SIZE_HELPER
#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);
static void *create_comm_channel_helper(void) __attribute__ ((unused));
static void *create_comm_channel_helper(void)
{
int ret;
struct channel *channel;
ret = sysconf(_SC_PAGESIZE);
if (ret == -1)
return NULL;
_bq_page_mask = ~(ret - 1);
send_ptr = &send1;
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;
}
#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 */
#define create_comm_channel() create_comm_channel_helper()
@ -55,19 +64,30 @@ __BEGIN_DECLS
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;
if (unlikely(channel->sender_ptr == _bq_end_buf1))
{
while (channel->state);
channel->state = 1;
channel->sender_ptr = channel->mapping2->buf[1];
send_ptr = &send2;
}
}
void send2(struct channel *channel, void **addr)
{
*channel->sender_ptr++ = addr;
if (unlikely(!((uintptr_t) channel->sender_ptr & channel->buf_mask)))
if (unlikely(channel->sender_ptr == _bq_end_buf2))
{
while (channel->state);
channel->state = 1;
sender_ptr_high =
(uintptr_t) channel->sender_ptr & _bq_page_mask;
if ((void *) sender_ptr_high == channel->mapping1)
channel->sender_ptr = channel->mapping2->buf[1];
else
channel->sender_ptr = channel->mapping1->buf[0];
channel->sender_ptr = channel->buf[0];
send_ptr = &send1;
}
}


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