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Added a notification mechanism for sending messages from

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another thread to the mainthread in a safe manner.

This is used for the DNS lookup code, and can also
be used by the signal handler to safely report actions back
to the application mainloop without using global variables.
This commit is contained in:
Jan Vidar Krey
2014-08-05 16:21:56 +02:00
parent 1526d63403
commit 46bdc77066
6 changed files with 175 additions and 20 deletions
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12
src/network/dnsresolver.c
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@@ -68,6 +68,11 @@ static void shutdown_free_results(void* ptr)
net_dns_result_free(result);
}
static void notify_callback(struct uhub_notify_handle* handle, void* ptr)
{
net_dns_process();
}
// NOTE: Any job manipulating the members of this
// struct must lock the mutex!
@@ -76,6 +81,8 @@ struct net_dns_subsystem
struct linked_list* jobs; // currently running jobs
struct linked_list* results; // queue of results that are awaiting being delivered to callback.
uhub_mutex_t mutex;
struct uhub_notify_handle* notify_handle; // used to signal back to the event loop that there is something to process.
};
static struct net_dns_subsystem* g_dns = NULL;
@@ -87,6 +94,7 @@ void net_dns_initialize()
g_dns->jobs = list_create();
g_dns->results = list_create();
uhub_mutex_init(&g_dns->mutex);
g_dns->notify_handle = net_notify_create(notify_callback, g_dns);
}
void net_dns_destroy()
@@ -105,6 +113,7 @@ void net_dns_destroy()
list_destroy(g_dns->jobs);
list_destroy(g_dns->results);
uhub_mutex_destroy(&g_dns->mutex);
net_notify_destroy(g_dns->notify_handle);
hub_free(g_dns);
g_dns = NULL;
}
@@ -113,7 +122,7 @@ void net_dns_process()
{
struct net_dns_result* result;
uhub_mutex_lock(&g_dns->mutex);
LOG_DUMP("net_dns_process(): jobs=%d, results=%d", (int) list_size(g_dns->jobs), (int) list_size(g_dns->results));
LOG_TRACE("net_dns_process(): jobs=%d, results=%d", (int) list_size(g_dns->jobs), (int) list_size(g_dns->results));
LIST_FOREACH(struct net_dns_result*, result, g_dns->results,
{
@@ -210,6 +219,7 @@ static void* job_thread_resolve_name(void* ptr)
uhub_mutex_lock(&g_dns->mutex);
list_remove(g_dns->jobs, job);
list_append(g_dns->results, dns_results);
net_notify_signal(g_dns->notify_handle, 1);
uhub_mutex_unlock(&g_dns->mutex);
return dns_results;