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| author | dimitri staessens <dimitri.staessens@intec.ugent.be> | 2016-05-24 23:34:05 +0200 |
|---|---|---|
| committer | dimitri staessens <dimitri.staessens@intec.ugent.be> | 2016-05-25 00:44:03 +0200 |
| commit | dafba02c1045b751375c0f4e2f67053e7019be6c (patch) | |
| tree | 4d0f03db1d9030cce475cb1ea5a2b4985326e27e | |
| parent | ca0d5f79a77cc56d529d40f5802d9772ab729703 (diff) | |
| download | ouroboros-dafba02c1045b751375c0f4e2f67053e7019be6c.tar.gz ouroboros-dafba02c1045b751375c0f4e2f67053e7019be6c.zip | |
lib: allow running shm_du_map in single block mode
this allows disabling support for SDU's that are larger than a block
in the DU MAP by defining the variable SHM_MAP_SINGLE_BLOCK
| -rw-r--r-- | src/lib/shm_du_map.c | 37 |
1 files changed, 31 insertions, 6 deletions
diff --git a/src/lib/shm_du_map.c b/src/lib/shm_du_map.c index e207c05e..249685fd 100644 --- a/src/lib/shm_du_map.c +++ b/src/lib/shm_du_map.c @@ -32,7 +32,6 @@ #include <ouroboros/logs.h> - #define SHM_BLOCKS_SIZE (SHM_BLOCKS_IN_MAP * SHM_DU_BUFF_BLOCK_SIZE) #define SHM_FILE_SIZE (SHM_BLOCKS_SIZE + 2 * sizeof (size_t) \ + sizeof(pthread_mutex_t)) @@ -234,11 +233,13 @@ ssize_t shm_create_du_buff(struct shm_du_map * dum, size_t len) { struct shm_du_buff * sdb; +#ifndef SHM_MAP_SINGLE_BLOCK long blocks = 0; int sz = size + sizeof *sdb; int sz2 = headspace + len + sizeof *sdb; - uint8_t * write_pos; size_t copy_len; +#endif + uint8_t * write_pos; ssize_t index; if (dum == NULL || data == NULL) { @@ -246,6 +247,13 @@ ssize_t shm_create_du_buff(struct shm_du_map * dum, return -1; } +#ifdef SHM_MAP_SINGLE_BLOCK + if (size + sizeof *sdb > SHM_DU_MAP_BLOCK_SIZE) { + LOG_DBGF("Multi-block SDU's disabled. Dropping."); + return -1; + } +#endif + if (headspace >= size) { LOG_DBGF("Index out of bounds."); return -1; @@ -258,6 +266,7 @@ ssize_t shm_create_du_buff(struct shm_du_map * dum, pthread_mutex_lock(dum->shm_mutex); +#ifndef SHM_MAP_SINGLE_BLOCK while (sz > 0) { sz -= SHM_DU_BUFF_BLOCK_SIZE; sz2 -= SHM_DU_BUFF_BLOCK_SIZE; @@ -273,17 +282,23 @@ ssize_t shm_create_du_buff(struct shm_du_map * dum, pthread_mutex_unlock(dum->shm_mutex); return -1; } +#else + if (!shm_map_free(dum, 1)) { + pthread_mutex_unlock(dum->shm_mutex); + return -1; + } +#endif sdb = get_head_ptr(dum); - sdb->size = size; sdb->garbage = 0; sdb->du_head = headspace; sdb->du_tail = sdb->du_head + len; - copy_len = MIN(len, SHM_DU_BUFF_BLOCK_SIZE - headspace - sizeof *sdb); write_pos = ((uint8_t *) sdb) + sizeof *sdb + headspace; +#ifndef SHM_MAP_SINGLE_BLOCK + copy_len = MIN(len, SHM_DU_BUFF_BLOCK_SIZE - headspace - sizeof *sdb); while (blocks > 0) { memcpy(write_pos, data, copy_len); *(dum->ptr_head) = (*dum->ptr_head + 1) @@ -296,7 +311,11 @@ ssize_t shm_create_du_buff(struct shm_du_map * dum, index = (*dum->ptr_head - 1 + SHM_BLOCKS_IN_MAP) & (SHM_BLOCKS_IN_MAP - 1); - +#else + memcpy(write_pos, data, len); + index = *dum->ptr_head; + *(dum->ptr_head) = (*dum->ptr_head + 1) & (SHM_BLOCKS_IN_MAP - 1); +#endif pthread_mutex_unlock(dum->shm_mutex); return index; @@ -331,9 +350,10 @@ int shm_du_map_read_sdu(uint8_t ** dst, int shm_release_du_buff(struct shm_du_map * dum, ssize_t idx) { +#ifndef SHM_MAP_SINGLE_BLOCK long sz; long blocks = 0; - +#endif if (idx > SHM_BLOCKS_IN_MAP) return -1; @@ -353,6 +373,7 @@ int shm_release_du_buff(struct shm_du_map * dum, ssize_t idx) while (get_tail_ptr(dum)->garbage == 1 && *dum->ptr_tail != *dum->ptr_head) { +#ifndef SHM_MAP_SINGLE_BLOCK sz = get_tail_ptr(dum)->size; while (sz + (long) sizeof(struct shm_du_buff) > 0) { sz -= SHM_DU_BUFF_BLOCK_SIZE; @@ -363,6 +384,10 @@ int shm_release_du_buff(struct shm_du_map * dum, ssize_t idx) (*dum->ptr_tail + blocks) & (SHM_BLOCKS_IN_MAP - 1); blocks = 0; +#else + *(dum->ptr_tail) = + (*dum->ptr_tail + 1) & (SHM_BLOCKS_IN_MAP - 1); +#endif } pthread_mutex_unlock(dum->shm_mutex); |