1 files changed, 55 insertions, 0 deletions

diff --git a/firmware/target/hosted/sdl/filesystem-sdl.c b/firmware/target/hosted/sdl/filesystem-sdl.c
new file mode 100644
index 0000000000..5a8e2c417a
--- /dev/null
+++ b/firmware/target/hosted/sdl/filesystem-sdl.c
@@ -0,0 +1,55 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2014 by Michael Sevakis
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#define RB_FILESYSTEM_OS
+#include "config.h"
+#include "system.h"
+#include "thread-sdl.h"
+#include "mutex.h"
+#include "file.h"
+
+#ifdef HAVE_SDL_THREADS
+#define YIELD_THRESHOLD 512
+static bool initialized = false;
+static struct mutex readwrite_mtx;
+
+/* Allow other threads to run while performing I/O */
+ssize_t os_sdl_readwrite(int osfd, void *buf, size_t nbyte, bool dowrite)
+{
+    if (!initialized)
+    {
+        mutex_init(&readwrite_mtx);
+        initialized = true;
+    }
+
+    mutex_lock(&readwrite_mtx);
+
+    void *mythread = nbyte > YIELD_THRESHOLD ? sim_thread_unlock() : NULL;
+
+    ssize_t rc = dowrite ? write(osfd, buf, nbyte) : read(osfd, buf, nbyte);
+
+    if (mythread)
+        sim_thread_lock(mythread);
+
+    mutex_unlock(&readwrite_mtx);
+    return rc;
+}
+
+#endif /* HAVE_SDL_THREADS */