irmd: Move registry objects to their own sources

Rename internal data structures so it's clear that they are the IRMd
representation of these objects for management purposes.

Split functionality for these objects off and and move them to their
own source files.

Rename internal functions of the IRMd to reflect this, with some small
refactoring.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 222 insertions, 0 deletions

diff --git a/src/irmd/reg/flow.c b/src/irmd/reg/flow.c
new file mode 100644
index 00000000..30b9c504
--- /dev/null
+++ b/src/irmd/reg/flow.c
@@ -0,0 +1,222 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2023
+ *
+ * The IPC Resource Manager - Registry - Flows
+ *
+ *    Dimitri Staessens <dimitri@ouroboros.rocks>
+ *    Sander Vrijders   <sander@ouroboros.rocks>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., http://www.fsf.org/about/contact/.
+ */
+
+#define _POSIX_C_SOURCE 200112L
+
+#include "config.h"
+
+#define OUROBOROS_PREFIX "reg-flow"
+
+#include <ouroboros/errno.h>
+#include <ouroboros/logs.h>
+#include <ouroboros/time_utils.h>
+#include <ouroboros/pthread.h>
+
+#include "flow.h"
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct reg_flow * reg_flow_create(pid_t     n_pid,
+                                  pid_t     n_1_pid,
+                                  int       flow_id,
+                                  qosspec_t qs)
+{
+        pthread_condattr_t cattr;
+        struct reg_flow *  f;
+
+        f = malloc(sizeof(*f));
+        if (f == NULL)
+                goto fail_malloc;
+
+        memset(f, 0, sizeof(*f));
+
+        if (pthread_condattr_init(&cattr))
+                goto fail_cattr;
+
+#ifndef __APPLE__
+        pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK);
+#endif
+        if (pthread_cond_init(&f->cond, &cattr))
+                goto fail_cond;
+
+        if (pthread_mutex_init(&f->mtx, NULL))
+                goto fail_mutex;
+
+        f->n_rb = shm_rbuff_create(n_pid, flow_id);
+        if (f->n_rb == NULL) {
+                log_err("Could not create ringbuffer for process %d.", n_pid);
+                goto fail_n_rbuff;
+        }
+
+        f->n_1_rb = shm_rbuff_create(n_1_pid, flow_id);
+        if (f->n_1_rb == NULL) {
+                log_err("Could not create ringbuffer for process %d.", n_1_pid);
+                goto fail_n_1_rbuff;
+        }
+
+        if (clock_gettime(CLOCK_MONOTONIC, &f->t0) < 0)
+                log_warn("Failed to set timestamp.");
+
+        pthread_condattr_destroy(&cattr);
+
+        f->n_pid   = n_pid;
+        f->n_1_pid = n_1_pid;
+        f->flow_id = flow_id;
+        f->qs      = qs;
+
+        f->state = FLOW_ALLOC_PENDING;
+
+        return f;
+
+ fail_n_1_rbuff:
+        shm_rbuff_destroy(f->n_rb);
+ fail_n_rbuff:
+        pthread_mutex_destroy(&f->mtx);
+ fail_mutex:
+        pthread_cond_destroy(&f->cond);
+ fail_cond:
+        pthread_condattr_destroy(&cattr);
+ fail_cattr:
+        free(f);
+ fail_malloc:
+        return NULL;
+}
+
+static void cancel_irm_destroy(void * o)
+{
+        struct reg_flow * f = (struct reg_flow *) o;
+
+        pthread_mutex_unlock(&f->mtx);
+
+        pthread_cond_destroy(&f->cond);
+        pthread_mutex_destroy(&f->mtx);
+
+        shm_rbuff_destroy(f->n_rb);
+        shm_rbuff_destroy(f->n_1_rb);
+
+        free(f);
+}
+
+void reg_flow_destroy(struct reg_flow * f)
+{
+        assert(f);
+
+        pthread_mutex_lock(&f->mtx);
+
+        assert(f->data.len == 0);
+
+        if (f->state == FLOW_DESTROY) {
+                pthread_mutex_unlock(&f->mtx);
+                return;
+        }
+
+        if (f->state == FLOW_ALLOC_PENDING)
+                f->state = FLOW_DESTROY;
+        else
+                f->state = FLOW_NULL;
+
+        pthread_cond_broadcast(&f->cond);
+
+        pthread_cleanup_push(cancel_irm_destroy, f);
+
+        while (f->state != FLOW_NULL)
+                pthread_cond_wait(&f->cond, &f->mtx);
+
+        pthread_cleanup_pop(true);
+}
+
+enum flow_state reg_flow_get_state(struct reg_flow * f)
+{
+        enum flow_state state;
+
+        assert(f);
+
+        pthread_mutex_lock(&f->mtx);
+
+        state = f->state;
+
+        pthread_mutex_unlock(&f->mtx);
+
+        return state;
+}
+
+void reg_flow_set_state(struct reg_flow * f,
+                        enum flow_state   state)
+{
+        assert(f);
+        assert(state != FLOW_DESTROY);
+
+        pthread_mutex_lock(&f->mtx);
+
+        f->state = state;
+        pthread_cond_broadcast(&f->cond);
+
+        pthread_mutex_unlock(&f->mtx);
+}
+
+int reg_flow_wait_state(struct reg_flow * f,
+                        enum flow_state   state,
+                        struct timespec * dl)
+{
+        int ret = 0;
+        int s;
+
+        assert(f);
+        assert(state != FLOW_NULL);
+        assert(state != FLOW_DESTROY);
+        assert(state != FLOW_DEALLOC_PENDING);
+
+        pthread_mutex_lock(&f->mtx);
+
+        assert(f->state != FLOW_NULL);
+
+        pthread_cleanup_push(__cleanup_mutex_unlock, &f->mtx);
+
+        while (!(f->state == state ||
+                 f->state == FLOW_DESTROY ||
+                 f->state == FLOW_DEALLOC_PENDING) &&
+               ret != -ETIMEDOUT) {
+                if (dl != NULL)
+                        ret = -pthread_cond_timedwait(&f->cond,
+                                                      &f->mtx,
+                                                      dl);
+                else
+                        ret = -pthread_cond_wait(&f->cond,
+                                                 &f->mtx);
+        }
+
+        if (f->state == FLOW_DESTROY ||
+            f->state == FLOW_DEALLOC_PENDING ||
+            ret == -ETIMEDOUT) {
+                f->state = FLOW_NULL;
+                pthread_cond_broadcast(&f->cond);
+        }
+
+        s = f->state;
+
+        pthread_cleanup_pop(true);
+
+        return ret ? ret : s;
+}