diff options
Diffstat (limited to 'src/svm')
| -rw-r--r-- | src/svm/svm_fifo.c | 35 | ||||
| -rw-r--r-- | src/svm/svm_fifo.h | 28 | ||||
| -rw-r--r-- | src/svm/svm_fifo_segment.h | 4 |
3 files changed, 47 insertions, 20 deletions
diff --git a/src/svm/svm_fifo.c b/src/svm/svm_fifo.c index e3f534b1..07b0d2df 100644 --- a/src/svm/svm_fifo.c +++ b/src/svm/svm_fifo.c @@ -13,7 +13,7 @@ * limitations under the License. */ -#include "svm_fifo.h" +#include <svm/svm_fifo.h> /** create an svm fifo, in the current heap. Fails vs blow up the process */ svm_fifo_t * @@ -362,18 +362,19 @@ svm_fifo_enqueue_nowait (svm_fifo_t * f, return svm_fifo_enqueue_internal (f, pid, max_bytes, copy_from_here); } -/** Enqueue a future segment. +/** + * Enqueue a future segment. + * * Two choices: either copies the entire segment, or copies nothing * Returns 0 of the entire segment was copied * Returns -1 if none of the segment was copied due to lack of space */ - static int -svm_fifo_enqueue_with_offset_internal2 (svm_fifo_t * f, - int pid, - u32 offset, - u32 required_bytes, - u8 * copy_from_here) +svm_fifo_enqueue_with_offset_internal (svm_fifo_t * f, + int pid, + u32 offset, + u32 required_bytes, + u8 * copy_from_here) { u32 total_copy_bytes, first_copy_bytes, second_copy_bytes; u32 cursize, nitems; @@ -424,14 +425,14 @@ svm_fifo_enqueue_with_offset (svm_fifo_t * f, u32 offset, u32 required_bytes, u8 * copy_from_here) { - return svm_fifo_enqueue_with_offset_internal2 + return svm_fifo_enqueue_with_offset_internal (f, pid, offset, required_bytes, copy_from_here); } static int -svm_fifo_dequeue_internal2 (svm_fifo_t * f, - int pid, u32 max_bytes, u8 * copy_here) +svm_fifo_dequeue_internal (svm_fifo_t * f, + int pid, u32 max_bytes, u8 * copy_here) { u32 total_copy_bytes, first_copy_bytes, second_copy_bytes; u32 cursize, nitems; @@ -484,7 +485,7 @@ int svm_fifo_dequeue_nowait (svm_fifo_t * f, int pid, u32 max_bytes, u8 * copy_here) { - return svm_fifo_dequeue_internal2 (f, pid, max_bytes, copy_here); + return svm_fifo_dequeue_internal (f, pid, max_bytes, copy_here); } int @@ -492,7 +493,7 @@ svm_fifo_peek (svm_fifo_t * f, int pid, u32 offset, u32 max_bytes, u8 * copy_here) { u32 total_copy_bytes, first_copy_bytes, second_copy_bytes; - u32 cursize, nitems; + u32 cursize, nitems, real_head; if (PREDICT_FALSE (f->cursize == 0)) return -2; /* nothing in the fifo */ @@ -500,6 +501,8 @@ svm_fifo_peek (svm_fifo_t * f, int pid, u32 offset, u32 max_bytes, /* read cursize, which can only increase while we're working */ cursize = f->cursize; nitems = f->nitems; + real_head = f->head + offset; + real_head = real_head >= nitems ? real_head - nitems : real_head; /* Number of bytes we're going to copy */ total_copy_bytes = (cursize < max_bytes) ? cursize : max_bytes; @@ -508,9 +511,9 @@ svm_fifo_peek (svm_fifo_t * f, int pid, u32 offset, u32 max_bytes, { /* Number of bytes in first copy segment */ first_copy_bytes = - ((nitems - f->head + offset) < total_copy_bytes) ? - (nitems - f->head + offset) : total_copy_bytes; - clib_memcpy (copy_here, &f->data[f->head + offset], first_copy_bytes); + ((nitems - real_head) < total_copy_bytes) ? + (nitems - real_head) : total_copy_bytes; + clib_memcpy (copy_here, &f->data[real_head], first_copy_bytes); /* Number of bytes in second copy segment, if any */ second_copy_bytes = total_copy_bytes - first_copy_bytes; diff --git a/src/svm/svm_fifo.h b/src/svm/svm_fifo.h index 70624b74..39556173 100644 --- a/src/svm/svm_fifo.h +++ b/src/svm/svm_fifo.h @@ -46,9 +46,11 @@ typedef struct { pthread_mutex_t mutex; /* 8 bytes */ pthread_cond_t condvar; /* 8 bytes */ - u32 owner_pid; svm_lock_tag_t tag; - volatile u32 cursize; + + volatile u32 cursize; /**< current fifo size */ + volatile u8 has_event; /**< non-zero if deq event exists */ + u32 owner_pid; u32 nitems; /* Backpointers */ @@ -112,6 +114,28 @@ svm_fifo_has_ooo_data (svm_fifo_t * f) return f->ooos_list_head != OOO_SEGMENT_INVALID_INDEX; } +/** + * Sets fifo event flag. + * + * @return 1 if flag was not set. + */ +always_inline u8 +svm_fifo_set_event (svm_fifo_t * f) +{ + /* Probably doesn't need to be atomic. Still, better avoid surprises */ + return __sync_lock_test_and_set (&f->has_event, 1) == 0; +} + +/** + * Unsets fifo event flag. + */ +always_inline void +svm_fifo_unset_event (svm_fifo_t * f) +{ + /* Probably doesn't need to be atomic. Still, better avoid surprises */ + __sync_lock_test_and_set (&f->has_event, 0); +} + svm_fifo_t *svm_fifo_create (u32 data_size_in_bytes); int svm_fifo_enqueue_nowait (svm_fifo_t * f, int pid, u32 max_bytes, diff --git a/src/svm/svm_fifo_segment.h b/src/svm/svm_fifo_segment.h index 793fa7c8..ecb5653a 100644 --- a/src/svm/svm_fifo_segment.h +++ b/src/svm/svm_fifo_segment.h @@ -15,8 +15,8 @@ #ifndef __included_ssvm_fifo_segment_h__ #define __included_ssvm_fifo_segment_h__ -#include "svm_fifo.h" -#include "ssvm.h" +#include <svm/svm_fifo.h> +#include <svm/ssvm.h> typedef struct { |