Add awful hack to work around very buggy android port forwarding

renderdoc/os/posix/android/android_network.cpp

@@ -23,11 +23,26 @@
  ******************************************************************************/
 
 #include <arpa/inet.h>
+#include <unistd.h>
 #include "os/os_specific.h"
 #include "os/posix/posix_network.h"
 
 namespace Network
 {
+void SocketPostSend()
+{
+  // we need to throttle android sending to ensure it never gets ahead of the PC otherwise the
+  // forwarded port may encounter a EWOULDBLOCK error.
+  // adb is buggy and will scompletely drop all writes as soon as a write blocks:
+  // https://issuetracker.google.com/issues/139078301
+  //
+  // Throttling the device end is a hack but is reasonably reliable as we assume the PC side is fast
+  // enough to read it. Since we batch most sends, sleeping on each send is not too costly, but this
+  // may have some impact especially around small packets (we force a flush on the end of each
+  // chunk/packet).
+  usleep(1500);
+}
+
 uint32_t Socket::GetRemoteIP() const
 {
   // Android uses abstract sockets which are only "localhost" accessible

renderdoc/os/posix/apple/apple_network.cpp

@@ -27,6 +27,11 @@
 
 namespace Network
 {
+void SocketPostSend()
+{
+  // only needed for awful hack on Android
+}
+
 uint32_t Socket::GetRemoteIP() const
 {
   return GetIPFromTCPSocket((int)socket);

renderdoc/os/posix/ggp/ggp_network.cpp

@@ -27,6 +27,11 @@
 
 namespace Network
 {
+void SocketPostSend()
+{
+  // only needed for awful hack on Android
+}
+
 uint32_t Socket::GetRemoteIP() const
 {
   return GetIPFromTCPSocket((int)socket);

renderdoc/os/posix/linux/linux_network.cpp

@@ -27,6 +27,11 @@
 
 namespace Network
 {
+void SocketPostSend()
+{
+  // only needed for awful hack on Android
+}
+
 uint32_t Socket::GetRemoteIP() const
 {
   return GetIPFromTCPSocket((int)socket);

renderdoc/os/posix/posix_network.cpp

@@ -70,6 +70,8 @@ static std::string errno_string(int err)
 
 namespace Network
 {
+void SocketPostSend();
+
 void Init()
 {
 }
@@ -190,6 +192,9 @@ bool Socket::SendDataBlocking(const void *buf, uint32_t length)
 
   RDCASSERT(sent == length);
 
+  // incredibly ugly hack necessary for android
+  SocketPostSend();
+
   return true;
 }