Proper reimplementation of C++11 thread event signaling and the network code now uses an atomic instead of mutexes for wait.

src/cpp11_thread.cpp

@@ -1,6 +1,7 @@
 #include <mutex>
 #include <thread>
 #include <condition_variable>
+#include <atomic>
 
 #include <86box/plat.h>
 
@@ -77,25 +78,25 @@ thread_close_mutex(mutex_t *_mutex)
 event_t *
 thread_create_event()
 {
-    auto ev = new event_cpp11_t;
-    return ev;
+    auto event = new event_cpp11_t;
+    return event;
 }
 
 int
 thread_wait_event(event_t *handle, int timeout)
 {
     auto event = reinterpret_cast<event_cpp11_t*>(handle);
-    auto lock = std::unique_lock<std::mutex>(event->mutex);
+    std::unique_lock<std::mutex> lock(event->mutex);
 
     if (timeout < 0) {
-        event->cond.wait(lock, [event] { return event->state; });
+        event->cond.wait(lock, [event] { return (event->state == true); });
     } else {
         auto to = std::chrono::system_clock::now() + std::chrono::milliseconds(timeout);
         std::cv_status status;
 
         do {
             status = event->cond.wait_until(lock, to);
-        } while ((status != std::cv_status::timeout) && !event->state);
+        } while ((status != std::cv_status::timeout) && (event->state == false));
 
         if (status == std::cv_status::timeout) {
             return 1;
@@ -108,10 +109,9 @@ void
 thread_set_event(event_t *handle)
 {
     auto event = reinterpret_cast<event_cpp11_t*>(handle);
-    {
-        auto lock = std::unique_lock<std::mutex>(event->mutex);
-        event->state = true;
-    }
+    std::lock_guard<std::mutex> lock(event->mutex);
+
+    event->state = true;
     event->cond.notify_all();
 }
 
@@ -119,8 +119,10 @@ void
 thread_reset_event(event_t *handle)
 {
     auto event = reinterpret_cast<event_cpp11_t*>(handle);
-    auto lock = std::unique_lock<std::mutex>(event->mutex);
+    std::lock_guard<std::mutex> lock(event->mutex);
+
     event->state = false;
+    // event->cond.notify_all();
 }
 
 void

src/network/net_pcap.c

@@ -172,6 +172,7 @@ poll_thread(void *arg)
     thread_set_event(poll_state);
 
     /* Create a waitable event. */
+    pcap_log("PCAP: Creating event...\n");
     evt = thread_create_event();
 
     /* As long as the channel is open.. */
@@ -185,8 +186,6 @@ poll_thread(void *arg)
 	if (pcap == NULL)
 		break;
 
-	/* Wait for the next packet to arrive. */
-	tx = network_tx_queue_check();
 	if (network_get_wait() || (poll_card->set_link_state && poll_card->set_link_state(poll_card->priv)) || (poll_card->wait && poll_card->wait(poll_card->priv)))
 		data = NULL;
 	else
@@ -208,11 +207,14 @@ poll_thread(void *arg)
 		}
 	}
 
+	/* Wait for the next packet to arrive. */
+	tx = network_tx_queue_check();
+
 	if (tx)
 		network_do_tx();
 
 	/* If we did not get anything, wait a while. */
-	if ((data == NULL) && !tx)
+	if (!tx)
 		thread_wait_event(evt, 10);
 
 	/* Release ownership of the device. */

src/network/network.c

@@ -49,6 +49,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 #include <stdarg.h>
+#include <stdatomic.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <string.h>
@@ -107,7 +108,7 @@ int		nic_do_log = ENABLE_NIC_LOG;
 
 
 /* Local variables. */
-static volatile int	net_wait = 0;
+static volatile atomic_int	net_wait = 0;
 static mutex_t		*network_mutex;
 static uint8_t		*network_mac;
 static uint8_t		network_timer_active = 0;
@@ -388,8 +389,8 @@ network_attach(void *dev, uint8_t *mac, NETRXCB rx, NETWAITCB wait, NETSETLINKST
     network_set_wait(0);
 
     /* Create the network events. */
-    poll_data.wake_poll_thread = thread_create_event();
     poll_data.poll_complete = thread_create_event();
+    poll_data.wake_poll_thread = thread_create_event();
 
     /* Activate the platform module. */
     switch(network_type) {
@@ -671,9 +672,7 @@ network_card_get_from_internal_name(char *s)
 void
 network_set_wait(int wait)
 {
-    network_wait(1);
     net_wait = wait;
-    network_wait(0);
 }
 
 
@@ -682,8 +681,6 @@ network_get_wait(void)
 {
     int ret;
 
-    network_wait(1);
     ret = net_wait;
-    network_wait(0);
     return ret;
 }