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-rw-r--r--src/lib/shm_rbuff.c408
1 files changed, 4 insertions, 404 deletions
diff --git a/src/lib/shm_rbuff.c b/src/lib/shm_rbuff.c
index b8db7c19..dc1d9f0a 100644
--- a/src/lib/shm_rbuff.c
+++ b/src/lib/shm_rbuff.c
@@ -1,406 +1,6 @@
-/*
- * Ouroboros - Copyright (C) 2016 - 2017
- *
- * Ring buffer for incoming SDUs
- *
- * Dimitri Staessens <[email protected]>
- * Sander Vrijders <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public License
- * version 2.1 as published by the Free Software Foundation.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA
- */
-
-#include <ouroboros/config.h>
-#include <ouroboros/shm_rbuff.h>
-#include <ouroboros/lockfile.h>
-#include <ouroboros/time_utils.h>
-#include <ouroboros/errno.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 RB_OPEN 0
-#define RB_CLOSED 1
-
-#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);
-#ifndef __APPLE__
- 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 = RB_OPEN;
- *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];
-
- assert(rb);
-
-#ifdef CONFIG_OUROBOROS_DEBUG
- pthread_mutex_lock(rb->lock);
-
- assert(shm_rbuff_empty(rb));
-
- pthread_mutex_unlock(rb->lock);
-#endif
- sprintf(fn, SHM_RBUFF_PREFIX "%d.%d", rb->api, rb->port_id);
-
- munmap(rb->shm_base, SHM_RBUFF_FILE_SIZE);
- shm_unlink(fn);
-
- free(rb);
-}
-
-int shm_rbuff_write(struct shm_rbuff * rb, size_t idx)
-{
- assert(rb);
- assert(idx < SHM_BUFFER_SIZE);
-
-#ifdef __APPLE__
- pthread_mutex_lock(rb->lock);
-#else
- if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
- pthread_mutex_consistent(rb->lock);
-#endif
- if (*rb->acl == RB_CLOSED) {
- pthread_mutex_unlock(rb->lock);
- return -ENOTALLOC;
- }
-
- if (!shm_rbuff_free(rb)) {
- pthread_mutex_unlock(rb->lock);
- return -EAGAIN;
- }
-
- if (shm_rbuff_empty(rb))
- pthread_cond_broadcast(rb->add);
-
- *head_el_ptr(rb) = (ssize_t) idx;
- *rb->head = (*rb->head + 1) & ((SHM_BUFFER_SIZE) -1);
-
- pthread_mutex_unlock(rb->lock);
-
- return 0;
-}
-
-ssize_t shm_rbuff_read(struct shm_rbuff * rb)
-{
- ssize_t ret = 0;
-
- assert(rb);
-
-#ifdef __APPLE__
- pthread_mutex_lock(rb->lock);
-#else
- if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
- pthread_mutex_consistent(rb->lock);
-#endif
- if (shm_rbuff_empty(rb)) {
- pthread_mutex_unlock(rb->lock);
- return -EAGAIN;
- }
-
- ret = *tail_el_ptr(rb);
- *rb->tail = (*rb->tail + 1) & ((SHM_BUFFER_SIZE) - 1);
- pthread_cond_broadcast(rb->del);
-
- pthread_mutex_unlock(rb->lock);
-
- return ret;
-}
-
-ssize_t shm_rbuff_read_b(struct shm_rbuff * rb,
- const struct timespec * timeout)
-{
- struct timespec abstime;
- ssize_t idx = -1;
-
- assert(rb);
-
-#ifdef __APPLE__
- pthread_mutex_lock(rb->lock);
-#else
- if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
- pthread_mutex_consistent(rb->lock);
-#endif
- if (timeout != NULL) {
- clock_gettime(PTHREAD_COND_CLOCK, &abstime);
- ts_add(&abstime, timeout, &abstime);
- }
-
- pthread_cleanup_push((void(*)(void *))pthread_mutex_unlock,
- (void *) rb->lock);
-
- while (shm_rbuff_empty(rb) && (idx != -ETIMEDOUT)) {
- if (timeout != NULL)
- idx = -pthread_cond_timedwait(rb->add,
- rb->lock,
- &abstime);
- else
- idx = -pthread_cond_wait(rb->add, rb->lock);
-#ifndef __APPLE__
- if (idx == -EOWNERDEAD)
- pthread_mutex_consistent(rb->lock);
-#endif
- }
-
- if (idx != -ETIMEDOUT) {
- idx = *tail_el_ptr(rb);
- *rb->tail = (*rb->tail + 1) & ((SHM_BUFFER_SIZE) - 1);
- pthread_cond_broadcast(rb->del);
- }
-
- pthread_cleanup_pop(true);
-
- return idx;
-}
-
-void shm_rbuff_block(struct shm_rbuff * rb)
-{
- assert(rb);
-
-#ifdef __APPLE__
- pthread_mutex_lock(rb->lock);
-#else
- if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
- pthread_mutex_consistent(rb->lock);
-#endif
- *rb->acl = RB_CLOSED;
-
- pthread_mutex_unlock(rb->lock);
-}
-
-void shm_rbuff_unblock(struct shm_rbuff * rb)
-{
- assert(rb);
-
-#ifdef __APPLE__
- pthread_mutex_lock(rb->lock);
-#else
- if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
- pthread_mutex_consistent(rb->lock);
-#endif
- *rb->acl = RB_OPEN;
-
- pthread_mutex_unlock(rb->lock);
-}
-
-void shm_rbuff_fini(struct shm_rbuff * rb)
-{
- assert(rb);
-
-#ifdef __APPLE__
- pthread_mutex_lock(rb->lock);
-#else
- if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
- pthread_mutex_consistent(rb->lock);
-#endif
- assert(*rb->acl == RB_CLOSED);
-
- pthread_cleanup_push((void(*)(void *))pthread_mutex_unlock,
- (void *) rb->lock);
-
- while (!shm_rbuff_empty(rb))
-#ifdef __APPLE__
- pthread_cond_wait(rb->del, rb->lock);
-#else
- if (pthread_cond_wait(rb->del, rb->lock) == EOWNERDEAD)
- pthread_mutex_consistent(rb->lock);
-#endif
- pthread_cleanup_pop(true);
-}
-
-size_t shm_rbuff_queued(struct shm_rbuff * rb)
-{
- size_t ret;
-
- assert(rb);
-
-#ifdef __APPLE__
- pthread_mutex_lock(rb->lock);
+#if (defined (SHM_RBUFF_LOCKLESS) && \
+ (defined(__GNUC__) || defined (__clang__)))
+#include "shm_rbuff_ll.c"
#else
- if (pthread_mutex_lock(rb->lock) == EOWNERDEAD)
- pthread_mutex_consistent(rb->lock);
+#include "shm_rbuff_pthr.c"
#endif
-
- ret = shm_rbuff_used(rb);
-
- pthread_mutex_unlock(rb->lock);
-
- return ret;
-}
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