lib: Refactor shm_rdrbuff and shm_rbuff

This refactors the creation of shm_rdrbuff and shm_rbuff elements. All
cleanup is now handled and the common code between the _open() and
_create() calls is moved to a static function. Common code between the
pthread and lockless rbuff implementations was moved to shm_rbuff.c

Signed-off-by: Dimitri Staessens <dimitri.staessens@ugent.be>
Signed-off-by: Sander Vrijders <sander.vrijders@ugent.be>

1 files changed, 2 insertions, 187 deletions

diff --git a/src/lib/shm_rbuff_pthr.c b/src/lib/shm_rbuff_pthr.c
index fb183d8f..565bb1fa 100644
--- a/src/lib/shm_rbuff_pthr.c
+++ b/src/lib/shm_rbuff_pthr.c
@@ -20,190 +20,6 @@
  * Foundation, Inc., http://www.fsf.org/about/contact/.
  */
 
-#define _POSIX_C_SOURCE 200809L
-
-#include <ouroboros/shm_rbuff.h>
-#include <ouroboros/lockfile.h>
-#include <ouroboros/time_utils.h>
-#include <ouroboros/errno.h>
-#include <ouroboros/fccntl.h>
-
-#include <pthread.h>
-#include <sys/mman.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdint.h>
-#include <unistd.h>
-#include <signal.h>
-#include <sys/stat.h>
-#include <assert.h>
-#include <stdbool.h>
-
-#define FN_MAX_CHARS 255
-
-#define SHM_RBUFF_FILE_SIZE ((SHM_BUFFER_SIZE) * sizeof(ssize_t)          \
-                             + 3 * sizeof(size_t)                         \
-                             + sizeof(pthread_mutex_t)                    \
-                             + 2 * sizeof (pthread_cond_t))
-
-#define shm_rbuff_used(rb) ((*rb->head + (SHM_BUFFER_SIZE) - *rb->tail)   \
-                            & ((SHM_BUFFER_SIZE) - 1))
-#define shm_rbuff_free(rb) (shm_rbuff_used(rb) + 1 < (SHM_BUFFER_SIZE))
-#define shm_rbuff_empty(rb) (*rb->head == *rb->tail)
-#define head_el_ptr(rb) (rb->shm_base + *rb->head)
-#define tail_el_ptr(rb) (rb->shm_base + *rb->tail)
-
-struct shm_rbuff {
-        ssize_t *         shm_base; /* start of entry                */
-        size_t *          head;     /* start of ringbuffer head      */
-        size_t *          tail;     /* start of ringbuffer tail      */
-        size_t *          acl;      /* access control                */
-        pthread_mutex_t * lock;     /* lock all free space in shm    */
-        pthread_cond_t *  add;      /* SDU arrived                   */
-        pthread_cond_t *  del;      /* SDU removed                   */
-        pid_t             api;      /* api of the owner              */
-        int               port_id;  /* port_id of the flow           */
-};
-
-struct shm_rbuff * shm_rbuff_create(pid_t api, int port_id)
-{
-        struct shm_rbuff *  rb;
-        int                 shm_fd;
-        ssize_t *           shm_base;
-        pthread_mutexattr_t mattr;
-        pthread_condattr_t  cattr;
-        char                fn[FN_MAX_CHARS];
-        mode_t              mask;
-
-        sprintf(fn, SHM_RBUFF_PREFIX "%d.%d", api, port_id);
-
-        rb = malloc(sizeof(*rb));
-        if (rb == NULL)
-                return NULL;
-
-        mask = umask(0);
-
-        shm_fd = shm_open(fn, O_CREAT | O_EXCL | O_RDWR, 0666);
-        if (shm_fd == -1) {
-                free(rb);
-                return NULL;
-        }
-
-        umask(mask);
-
-        if (ftruncate(shm_fd, SHM_RBUFF_FILE_SIZE - 1) < 0) {
-                free(rb);
-                close(shm_fd);
-                return NULL;
-        }
-
-        shm_base = mmap(NULL,
-                        SHM_RBUFF_FILE_SIZE,
-                        PROT_READ | PROT_WRITE,
-                        MAP_SHARED,
-                        shm_fd,
-                        0);
-
-        close(shm_fd);
-
-        if (shm_base == MAP_FAILED) {
-                shm_unlink(fn);
-                free(rb);
-                return NULL;
-        }
-
-        rb->shm_base = shm_base;
-        rb->head     = (size_t *) (rb->shm_base + (SHM_BUFFER_SIZE));
-        rb->tail     = rb->head + 1;
-        rb->acl      = rb->tail + 1;
-        rb->lock     = (pthread_mutex_t *) (rb->acl + 1);
-        rb->add      = (pthread_cond_t *) (rb->lock + 1);
-        rb->del      = rb->add + 1;
-
-        pthread_mutexattr_init(&mattr);
-#ifdef HAVE_ROBUST_MUTEX
-        pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST);
-#endif
-        pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED);
-        pthread_mutex_init(rb->lock, &mattr);
-
-        pthread_condattr_init(&cattr);
-        pthread_condattr_setpshared(&cattr, PTHREAD_PROCESS_SHARED);
-#ifndef __APPLE__
-        pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK);
-#endif
-        pthread_cond_init(rb->add, &cattr);
-        pthread_cond_init(rb->del, &cattr);
-
-        *rb->acl  = ACL_RDWR;
-        *rb->head = 0;
-        *rb->tail = 0;
-
-        rb->api = api;
-        rb->port_id = port_id;
-
-        return rb;
-}
-
-struct shm_rbuff * shm_rbuff_open(pid_t api, int port_id)
-{
-        struct shm_rbuff * rb;
-        int                shm_fd;
-        ssize_t *          shm_base;
-        char               fn[FN_MAX_CHARS];
-
-        sprintf(fn, SHM_RBUFF_PREFIX "%d.%d", api, port_id);
-
-        rb = malloc(sizeof(*rb));
-        if (rb == NULL)
-                return NULL;
-
-        shm_fd = shm_open(fn, O_RDWR, 0666);
-        if (shm_fd == -1) {
-                free(rb);
-                return NULL;
-        }
-
-        shm_base = mmap(NULL,
-                        SHM_RBUFF_FILE_SIZE,
-                        PROT_READ | PROT_WRITE,
-                        MAP_SHARED,
-                        shm_fd,
-                        0);
-
-        close(shm_fd);
-
-        if (shm_base == MAP_FAILED) {
-                shm_unlink(fn);
-                free(rb);
-                return NULL;
-        }
-
-        rb->shm_base = shm_base;
-        rb->head     = (size_t *) (rb->shm_base + (SHM_BUFFER_SIZE));
-        rb->tail     = rb->head + 1;
-        rb->acl      = rb->tail + 1;
-        rb->lock     = (pthread_mutex_t *) (rb->acl + 1);
-        rb->add      = (pthread_cond_t *) (rb->lock + 1);
-        rb->del      = rb->add + 1;
-
-        rb->api = api;
-        rb->port_id = port_id;
-
-        return rb;
-}
-
-void shm_rbuff_close(struct shm_rbuff * rb)
-{
-        assert(rb);
-
-        munmap(rb->shm_base, SHM_RBUFF_FILE_SIZE);
-
-        free(rb);
-}
-
 void shm_rbuff_destroy(struct shm_rbuff * rb)
 {
         char fn[FN_MAX_CHARS];
@@ -219,10 +35,9 @@ void shm_rbuff_destroy(struct shm_rbuff * rb)
 #endif
         sprintf(fn, SHM_RBUFF_PREFIX "%d.%d", rb->api, rb->port_id);
 
-        munmap(rb->shm_base, SHM_RBUFF_FILE_SIZE);
-        shm_unlink(fn);
+        shm_rbuff_close(rb);
 
-        free(rb);
+        shm_unlink(fn);
 }
 
 int shm_rbuff_write(struct shm_rbuff * rb,