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-rw-r--r--src/lib/shm_du_map.c194
-rw-r--r--src/lib/tests/shm_du_map_test_du_buff_create.c6
-rw-r--r--src/lib/tests/shm_du_map_test_prod_cons.c58
3 files changed, 87 insertions, 171 deletions
diff --git a/src/lib/shm_du_map.c b/src/lib/shm_du_map.c
index 052b8868..630cfa42 100644
--- a/src/lib/shm_du_map.c
+++ b/src/lib/shm_du_map.c
@@ -34,23 +34,28 @@
#define SHM_DU_BLOCK_DATA_SIZE (SHM_DU_BUFF_BLOCK_SIZE - \
- sizeof (struct shm_block))
+ sizeof(struct shm_block))
#define SHM_BLOCKS_IN_MAP (SHM_DU_MAP_SIZE / SHM_DU_BUFF_BLOCK_SIZE)
#define SHM_BLOCKS_SIZE (SHM_DU_BUFF_BLOCK_SIZE * SHM_BLOCKS_IN_MAP)
#define SHM_BUFFS_SIZE (SHM_BLOCKS_IN_MAP * sizeof (struct shm_du_buff))
-#define SHM_MGT_MAP_SIZE (SHM_BLOCKS_IN_MAP * sizeof (uint8_t))
#define SHM_FILE_SIZE (SHM_BLOCKS_IN_MAP * (SHM_DU_BUFF_BLOCK_SIZE \
- + sizeof (struct shm_du_buff) \
- + sizeof (uint8_t)) \
+ + sizeof(struct shm_du_buff) \
+ + sizeof(uint8_t)) \
+ + 2 * sizeof (size_t) \
+ sizeof(pthread_mutex_t))
-#define idx_to_block_ptr(dum, i) ((struct shm_block *) \
+#define idx_to_block_ptr(dum, i) ((struct shm_block *) \
(dum->shm_base + i * SHM_DU_BUFF_BLOCK_SIZE))
#define idx_to_du_buff_ptr(dum, i) (dum->ptr_du_buff + i)
#define du_buff_ptr_to_idx(dum, sdb) ((sdb - dum->ptr_du_buff) / sizeof *sdb)
#define block_ptr_to_idx(dum, sdb) (((uint8_t *)sdb - dum->shm_base) \
/ SHM_DU_BUFF_BLOCK_SIZE)
+#define shm_map_used(dum) ((*(dum->ptr_head) + SHM_BLOCKS_IN_MAP - \
+ *(dum->ptr_tail)) % SHM_BLOCKS_IN_MAP)
+
+#define shm_map_free(dum, i)(shm_map_used(dum) + i < SHM_BLOCKS_IN_MAP)
+
struct shm_block {
size_t size;
long next;
@@ -64,9 +69,10 @@ struct shm_du_buff {
};
struct shm_du_map {
- uint8_t * shm_base; /* start of buffer blocks */
+ uint8_t * shm_base; /* start of blocks */
struct shm_du_buff * ptr_du_buff; /* start of du_buff structs */
- uint8_t * ptr_map; /* start of management map */
+ size_t * ptr_head; /* start of ringbuffer head */
+ size_t * ptr_tail; /* start of ringbuffer tail */
pthread_mutex_t * shm_mutex; /* lock all free space in shm */
int fd;
};
@@ -76,9 +82,7 @@ struct shm_du_map * shm_du_map_create()
struct shm_du_map * dum;
int shm_fd;
uint8_t * shm_base;
- uint8_t * ptr;
pthread_mutexattr_t attr;
- int i;
dum = malloc(sizeof *dum);
if (dum == NULL) {
@@ -129,17 +133,19 @@ struct shm_du_map * shm_du_map_create()
dum->shm_base = shm_base;
dum->ptr_du_buff = (struct shm_du_buff *)
((uint8_t *) dum->shm_base + SHM_BLOCKS_SIZE);
- dum->ptr_map = (uint8_t *) dum->ptr_du_buff + SHM_BUFFS_SIZE;
+ dum->ptr_head = (size_t *)
+ ((uint8_t *) dum->ptr_du_buff + SHM_BUFFS_SIZE);
+ dum->ptr_tail = (size_t *)
+ ((uint8_t *) dum->ptr_head + sizeof(size_t));
dum->shm_mutex = (pthread_mutex_t *)
- ((uint8_t *) dum->ptr_map + SHM_MGT_MAP_SIZE);
+ ((uint8_t *) dum->ptr_tail + sizeof(size_t));
pthread_mutexattr_init(&attr);
pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
pthread_mutex_init(dum->shm_mutex, &attr);
- ptr = dum->ptr_map;
- for (i = 0; i < SHM_BLOCKS_IN_MAP; ++i)
- *(ptr++) = 0;
+ *dum->ptr_head = 0;
+ *dum->ptr_tail = 0;
dum->fd = shm_fd;
@@ -185,9 +191,12 @@ struct shm_du_map * shm_du_map_open()
dum->shm_base = shm_base;
dum->ptr_du_buff = (struct shm_du_buff *)
((uint8_t *) dum->shm_base + SHM_BLOCKS_SIZE);
- dum->ptr_map = (uint8_t *) dum->ptr_du_buff + SHM_BUFFS_SIZE;
+ dum->ptr_head = (size_t *)
+ ((uint8_t *) dum->ptr_du_buff + SHM_BUFFS_SIZE);
+ dum->ptr_tail = (size_t *)
+ ((uint8_t *) dum->ptr_head + sizeof(size_t));
dum->shm_mutex = (pthread_mutex_t *)
- ((uint8_t *) dum->ptr_map + SHM_MGT_MAP_SIZE);
+ ((uint8_t *) dum->ptr_tail + sizeof(size_t));
return dum;
}
@@ -208,53 +217,6 @@ void shm_du_map_close(struct shm_du_map * dum)
free(dum);
}
-static struct shm_du_buff * alloc_du_buff(struct shm_du_map * dum)
-{
- uint8_t * ptr = dum->ptr_map;
-
- pthread_mutex_lock(dum->shm_mutex);
-
- while (*ptr == 1 && ptr < (uint8_t *) dum->shm_mutex)
- ++ptr;
-
- if (ptr < (uint8_t *) dum->shm_mutex) {
- *ptr = 1;
- } else {
- pthread_mutex_unlock(dum->shm_mutex);
- return NULL;
- }
-
- pthread_mutex_unlock(dum->shm_mutex);
-
- return dum->ptr_du_buff + (ptr - dum->ptr_map);
-}
-
-static struct shm_block * alloc_block(struct shm_du_map * dum)
-{
-
- pthread_mutex_lock(dum->shm_mutex);
-
- uint8_t * ptr = dum->ptr_map;
-
- while (*ptr == 1 && ptr < (uint8_t *) dum->shm_mutex)
- ++ptr;
-
- if (ptr < (uint8_t *) dum->shm_mutex) {
- *ptr = 1;
- }
- else {
- pthread_mutex_unlock(dum->shm_mutex);
- return NULL;
- }
-
- pthread_mutex_unlock(dum->shm_mutex);
-
-
- return (struct shm_block *)
- (dum->shm_base + ((ptr - dum->ptr_map)
- * SHM_DU_BUFF_BLOCK_SIZE));
-}
-
struct shm_du_buff * shm_create_du_buff(struct shm_du_map * dum,
size_t size,
size_t headspace,
@@ -262,11 +224,11 @@ struct shm_du_buff * shm_create_du_buff(struct shm_du_map * dum,
size_t len)
{
struct shm_du_buff * sdb;
- long index;
long prev_index = -1;
size_t remaining = size;
size_t ts = size - (headspace + len);
uint8_t * read_pos = data;
+ size_t blocks;
if (dum == NULL || data == NULL) {
LOG_DBGF("Bogus input, bugging out.");
@@ -288,51 +250,42 @@ struct shm_du_buff * shm_create_du_buff(struct shm_du_map * dum,
return NULL;
}
- sdb = alloc_du_buff(dum);
- if (sdb == NULL) {
+ pthread_mutex_lock(dum->shm_mutex);
+
+ blocks = size / SHM_DU_BLOCK_DATA_SIZE;
+ if (size % SHM_DU_BLOCK_DATA_SIZE > 0)
+ ++blocks;
+
+ if (!shm_map_free(dum, blocks)) {
+ pthread_mutex_unlock(dum->shm_mutex);
LOG_DBGF("Allocation failed, Out of Memory.");
return NULL;
}
- index = du_buff_ptr_to_idx(dum, sdb);
+ sdb = dum->ptr_du_buff + *dum->ptr_head;
+
sdb->size = size;
sdb->du_head = headspace;
sdb->du_tail = sdb->du_head + len;
while (remaining > 0) {
struct shm_block * shm_buf;
- unsigned long bytes_to_copy = len;
- uint8_t * write_pos;
+ long bytes_to_copy = len;
+ uint8_t * write_pos;
- if (prev_index == -1)
- shm_buf = idx_to_block_ptr(dum, index);
- else
- shm_buf = alloc_block(dum);
-
- if (shm_buf == NULL) {
- shm_release_du_buff(dum, sdb);
- return NULL;
- }
+ shm_buf = idx_to_block_ptr(dum, *(dum->ptr_head));
write_pos = (uint8_t *) shm_buf + sizeof *shm_buf;
- index = block_ptr_to_idx(dum, shm_buf);
+ shm_buf->size = remaining < SHM_DU_BLOCK_DATA_SIZE ?
+ remaining : SHM_DU_BLOCK_DATA_SIZE;
- if (size > SHM_DU_BLOCK_DATA_SIZE
- && remaining - ts <= SHM_DU_BLOCK_DATA_SIZE
- && remaining != ts) {
+ bytes_to_copy = shm_buf->size;
+
+ if (remaining <= SHM_DU_BLOCK_DATA_SIZE)
+ bytes_to_copy -= ts;
+ else if (remaining - ts <= SHM_DU_BLOCK_DATA_SIZE)
shm_buf->size = remaining - ts;
- bytes_to_copy = shm_buf->size;
- } else if (size > SHM_DU_BLOCK_DATA_SIZE && remaining == ts) {
- shm_buf->size = ts;
- bytes_to_copy = 0;
- } else {
- shm_buf->size = remaining < SHM_DU_BLOCK_DATA_SIZE ?
- remaining : SHM_DU_BLOCK_DATA_SIZE;
- bytes_to_copy =shm_buf->size;
- if (remaining == shm_buf->size)
- bytes_to_copy -= ts;
- }
remaining -= shm_buf->size;
@@ -340,16 +293,17 @@ struct shm_du_buff * shm_create_du_buff(struct shm_du_map * dum,
#ifdef CONFIG_OUROBOROS_DEBUG
memset(write_pos, 0, sdb->du_head);
#endif
-
write_pos += sdb->du_head;
bytes_to_copy -= sdb->du_head;
}
if (prev_index != -1)
- idx_to_block_ptr(dum, prev_index)->next = index;
-
- memcpy(write_pos, read_pos, bytes_to_copy);
+ idx_to_block_ptr(dum, prev_index)->next =
+ *(dum->ptr_head);
+ if (len > 0) {
+ memcpy(write_pos, read_pos, bytes_to_copy);
+ }
read_pos += bytes_to_copy;
#ifdef CONFIG_OUROBOROS_DEBUG
if (remaining == 0) {
@@ -360,52 +314,38 @@ struct shm_du_buff * shm_create_du_buff(struct shm_du_map * dum,
shm_buf->next = -1;
shm_buf->prev = prev_index;
- prev_index = index;
+ prev_index = *dum->ptr_head;
+
+ *(dum->ptr_head) = (*dum->ptr_head + 1) % SHM_BLOCKS_IN_MAP;
}
+ pthread_mutex_unlock(dum->shm_mutex);
+
return sdb;
}
-void shm_release_du_buff(struct shm_du_map * dum, struct shm_du_buff * sdb)
+int shm_release_du_buff(struct shm_du_map * dum)
{
- long index = 0;
-
- if (sdb == NULL) {
- LOG_DBGF("Bogus input, bugging out.");
- return;
- }
-
- if (sdb < dum->ptr_du_buff || sdb > dum->ptr_du_buff + SHM_BUFFS_SIZE) {
- LOG_DBGF("Refused to free sdb outside of region.");
- return;
- }
-
- if ((sdb - dum->ptr_du_buff) % sizeof *sdb != 0) {
- LOG_DBGF("Refused to free sdb at incorrect offset.");
- return;
- }
-
- index = du_buff_ptr_to_idx(dum, sdb);
+ int released = 0;
pthread_mutex_lock(dum->shm_mutex);
- if (dum->ptr_map[index] == 0) {
- LOG_DBGF("Attempt to free unused sdb. Nothing to do.");
+ if (*dum->ptr_head == *dum->ptr_tail) {
+ LOG_DBGF("Attempt to free empty ringbuffer. Nothing to do.");
pthread_mutex_unlock(dum->shm_mutex);
- return;
+ return -1;
}
- /* release all blocks in the structure */
- dum->ptr_map[index] = 0;
-
- index = idx_to_block_ptr(dum, index)->next;
- while (index != -1) {
- dum->ptr_map[index] = 0;
- index = idx_to_block_ptr(dum, index)->next;
+ while (idx_to_block_ptr(dum, *dum->ptr_tail)->next != -1) {
+ *(dum->ptr_tail) = (*dum->ptr_tail + 1) % SHM_BLOCKS_IN_MAP;
+ released++;
}
+ *(dum->ptr_tail) = (*dum->ptr_tail + 1) % SHM_BLOCKS_IN_MAP;
+
pthread_mutex_unlock(dum->shm_mutex);
+ return 0;
}
uint8_t * shm_du_buff_head_alloc(struct shm_du_map * dum,
diff --git a/src/lib/tests/shm_du_map_test_du_buff_create.c b/src/lib/tests/shm_du_map_test_du_buff_create.c
index 9f66b20c..6787a1bc 100644
--- a/src/lib/tests/shm_du_map_test_du_buff_create.c
+++ b/src/lib/tests/shm_du_map_test_du_buff_create.c
@@ -54,7 +54,9 @@ int shm_du_map_test_du_buff_create(int argc, char ** argv)
j_inc = MAX(1, SHM_DU_BLOCK_DATA_SIZE / 8);
k_inc = MAX(1, SHM_DU_BLOCK_DATA_SIZE / 16);
- for (i = SHM_DU_BUFF_BLOCK_SIZE / 4; i <= TEST_BUFF_SIZE; i += i_inc) {
+ for (i = SHM_DU_BLOCK_DATA_SIZE / 4;
+ i <= TEST_BUFF_SIZE;
+ i += i_inc) {
for (j = 0; j < i; j += j_inc) {
for (k = 0; k < i - j; k += k_inc) {
if (k > SHM_DU_BLOCK_DATA_SIZE)
@@ -73,7 +75,7 @@ int shm_du_map_test_du_buff_create(int argc, char ** argv)
shm_du_map_close(dum);
return -1;
}
- shm_release_du_buff(dum, dub);
+ shm_release_du_buff(dum);
}
}
}
diff --git a/src/lib/tests/shm_du_map_test_prod_cons.c b/src/lib/tests/shm_du_map_test_prod_cons.c
index 945104c1..ff9dfb0a 100644
--- a/src/lib/tests/shm_du_map_test_prod_cons.c
+++ b/src/lib/tests/shm_du_map_test_prod_cons.c
@@ -27,12 +27,12 @@
#include <pthread.h>
#include "shm_du_map.c"
-#define TEST_BUFF_SIZE (3 * SHM_DU_BLOCK_DATA_SIZE)
+#define TEST_BUFF_SIZE (SHM_DU_BLOCK_DATA_SIZE)
#define MAX(a,b) (a > b ? a : b)
#define MIN(a,b) (a < b ? a : b)
-int * sync;
+int sync;
void * produce()
{
@@ -46,31 +46,26 @@ void * produce()
struct timespec starttime;
struct timespec stoptime;
double elapsed;
- long overruns = 0;
dum = shm_du_map_open();
if (dum == NULL)
return (void *)-1;
srand(time(NULL));
- clock_gettime(CLOCK_MONOTONIC, &starttime);
test_values = malloc (sizeof *test_values * TEST_BUFF_SIZE);
for (i = 0; i < TEST_BUFF_SIZE; i++)
test_values[i] = 170;
- for (i = 0; i < 4 * SHM_BLOCKS_IN_MAP; i++) {
+ clock_gettime(CLOCK_MONOTONIC, &starttime);
+ for (i = 0; i < SHM_BLOCKS_IN_MAP; i++) {
struct shm_du_buff * sdb;
size_t len;
- struct timespec ts;
-
- test_buf_size = rand() % (TEST_BUFF_SIZE - 512) + 512;
- headspace = MAX(4, rand() % 64);
- tailspace = MAX(1, rand() % 24);
+ test_buf_size = TEST_BUFF_SIZE;
- ts.tv_sec = 0;
- ts.tv_nsec = rand() % 90000;
+ headspace = 32;
+ tailspace = 8;
len = test_buf_size - (headspace + tailspace);
@@ -81,23 +76,12 @@ void * produce()
len);
if (sdb != NULL) {
- sync[i] = du_buff_ptr_to_idx(dum, sdb);
bytes_written += len;
}
else {
- i--;
- ++overruns;
- ts.tv_nsec = 10000;
- nanosleep(&ts, NULL);
- }
- nanosleep(&ts, NULL);
-
- if (overruns > 100) {
- LOG_INFO("Bugging out due to overruns.");
- sync[i+1] = -2;
+ sync = -2;
break;
}
-
}
clock_gettime(CLOCK_MONOTONIC, &stoptime);
@@ -110,6 +94,9 @@ void * produce()
free(test_values);
shm_du_map_close(dum);
+
+ sync = -1;
+
return 0;
}
@@ -117,24 +104,19 @@ void * consume()
{
struct shm_du_map * dum;
- long i;
-
struct timespec ts;
ts.tv_sec = 0;
- ts.tv_nsec = 5000;
+ ts.tv_nsec = 1000;
dum = shm_du_map_open();
if (dum == NULL)
pthread_exit((void *) -1);
- for (i = 0; i < 4 * SHM_BLOCKS_IN_MAP; i++) {
- while (sync[i] == -1)
- nanosleep(&ts, NULL); /* wait for the producer */
- if (sync[i] == -2)
- break;
- shm_release_du_buff(dum, idx_to_du_buff_ptr(dum, sync[i]));
+ while (!sync) {
+ while (!shm_release_du_buff(dum));
+ nanosleep(&ts, NULL);
}
shm_du_map_close(dum);
@@ -148,11 +130,8 @@ int shm_du_map_test_prod_cons(int argc, char ** argv)
int res1;
- int i;
-
pthread_t producer;
pthread_t consumer;
-
shm_unlink(SHM_DU_MAP_FILENAME);
dum = shm_du_map_create();
@@ -160,10 +139,7 @@ int shm_du_map_test_prod_cons(int argc, char ** argv)
if (dum == NULL)
return -1;
- sync = malloc(sizeof *sync * 4 * SHM_BLOCKS_IN_MAP);
-
- for (i = 0; i < 4 * SHM_BLOCKS_IN_MAP; i++)
- sync[i] = -1;
+ sync = 0;
res1 = (int) pthread_create(&producer, NULL, produce, NULL);
pthread_create(&consumer, NULL, consume, NULL);
@@ -171,8 +147,6 @@ int shm_du_map_test_prod_cons(int argc, char ** argv)
pthread_join(producer, NULL);
pthread_join(consumer, NULL);
- free(sync);
-
shm_du_map_close(dum);
return res1;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 15:31:33 +0000