afb-proto-ws: Fix autolock in proto-ws

Because a systemd event loop can not be reentered
while evaluating an event callback, the event loop
was removed from the threads. It had the effect to
enter in deadlock when calling a synchronous call
while in an event callback.

Queueing a job solves the issue.

But because using queued job has implications on
libafbws, a fake job manager is added for libafbws.

Change-Id: Id793bea55743790082eaab48cd4cc87f7993772a
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

1 files changed, 150 insertions, 0 deletions

diff --git a/src/jobs-fake.c b/src/jobs-fake.c
new file mode 100644
index 00000000..3c1c2732
--- /dev/null
+++ b/src/jobs-fake.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2016, 2017 "IoT.bzh"
+ * Author José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <signal.h>
+#include <time.h>
+#include <sys/syscall.h>
+#include <pthread.h>
+#include <errno.h>
+#include <assert.h>
+
+#include <systemd/sd-event.h>
+
+#include "jobs.h"
+#include "sig-monitor.h"
+#include "verbose.h"
+
+#include "jobs.h"
+
+struct jobloop;
+
+struct job
+{
+	struct job *next;
+	const void *group;
+	int timeout;
+	void (*callback)(int signum, void* arg);
+	void *closure;
+};
+
+static struct job *first, *last;
+static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+
+static int add_job(const void *group, int timeout, void (*callback)(int signum, void *closure), void *closure)
+{
+	struct job *j;
+
+	j = malloc(sizeof*j);
+	if (!j) {
+		errno = ENOMEM;
+		return -1;
+	}
+
+	j->next = 0;
+	j->group = group;
+	j->timeout = timeout;
+	j->callback = callback;
+	j->closure = closure;
+
+	pthread_mutex_lock(&mutex);
+	if (first)
+		last->next = j;
+	else
+		first = j;
+	last = j;
+	pthread_mutex_unlock(&mutex);	
+	return 0;
+}
+
+static void *thrrun(void *arg)
+{
+	struct job *j;
+
+	pthread_mutex_lock(&mutex);
+	j = first;
+	if (j)
+		first = j->next;
+	pthread_mutex_unlock(&mutex);	
+	if (j) {
+		j->callback(0, j->closure);
+		free(j);
+	}
+	return 0;
+}
+
+int jobs_queue(
+	const void *group,
+	int timeout,
+	void (*callback)(int signum, void* arg),
+	void *arg)
+{
+	pthread_t tid;
+	int rc = add_job(group, timeout, callback, arg);
+	if (!rc) {
+		rc = pthread_create(&tid, NULL, thrrun, NULL);
+		if (rc)
+			rc = -1;
+	}
+	return rc;
+}
+
+#if 0
+int jobs_enter(
+	const void *group,
+	int timeout,
+	void (*callback)(int signum, void *closure, struct jobloop *jobloop),
+	void *closure)
+{
+	return 0;
+}
+
+int jobs_leave(struct jobloop *jobloop)
+{
+	return 0;
+}
+
+int jobs_call(
+	const void *group,
+	int timeout,
+	void (*callback)(int, void*),
+	void *arg)
+{
+	return 0;
+}
+
+struct sd_event *jobs_get_sd_event()
+{
+	struct sd_event *r;
+	int rc = sd_event_default(&r);
+	return rc < 0 ? NULL : r;
+}
+
+void jobs_terminate()
+{
+}
+
+int jobs_start(int allowed_count, int start_count, int waiter_count, void (*start)(int signum))
+{
+	start(0);
+	return 0;
+}
+#endif