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diff --git a/uisimulator/common/io.c b/uisimulator/common/io.c
index 6f9f4b2..3b45425 100644
--- a/uisimulator/common/io.c
+++ b/uisimulator/common/io.c
@@ -46,13 +46,8 @@
 #include "dir-win32.h"
 #endif
 
+#include <SDL_thread.h>
 #include <fcntl.h>
-#ifdef HAVE_SDL_THREADS
-#include "thread-sdl.h"
-#else
-#define sim_thread_unlock() NULL
-#define sim_thread_lock(a)
-#endif
 #include "thread.h"
 #include "kernel.h"
 #include "debug.h"
@@ -220,22 +215,18 @@ enum io_dir
 
 struct sim_io
 {
-    struct mutex sim_mutex; /* Rockbox mutex */
+    struct semaphore sem; /* Rockbox semaphore */
     int cmd; /* The command to perform */
     int ready; /* I/O ready flag - 1= ready */
     int fd; /* The file to read/write */
-    void *buf; /* The buffer to read/write */
+    const void *buf; /* The buffer to read/write */
     size_t count; /* Number of bytes to read/write */
-    size_t accum; /* Acculated bytes transferred */
+    size_t result; /* Bytes transferred */
 };
 
-static struct sim_io io;
-
 int ata_init(void)
 {
     /* Initialize the rockbox kernel objects on a rockbox thread */
-    mutex_init(&io.sim_mutex);
-    io.accum = 0;
     return 1;
 }
 
@@ -244,39 +235,57 @@ int ata_spinup_time(void)
     return HZ;
 }
 
-static ssize_t io_trigger_and_wait(enum io_dir cmd)
+static int sim_io_thread_fn(void *data)
 {
-    void *mythread = NULL;
+    struct sim_io *io = data;
     ssize_t result;
 
-    if (io.count > IO_YIELD_THRESHOLD ||
-        (io.accum += io.count) >= IO_YIELD_THRESHOLD)
-    {
-        /* Allow other rockbox threads to run */
-        io.accum = 0;
-        mythread = sim_thread_unlock();
-    }
+    printf("%s() enter\n", __func__);
 
-    switch (cmd)
+    switch (io->cmd)
     {
     case IO_READ:
-        result = read(io.fd, io.buf, io.count);
+        result = read(io->fd, (void*)io->buf, io->count);
         break;
     case IO_WRITE:
-        result = write(io.fd, io.buf, io.count);
+        result = write(io->fd, io->buf, io->count);
         break;
         /* shut up gcc */
     default:
         result = -1;
     }
 
-    /* Regain our status as current */
-    if (mythread != NULL)
-    {
-        sim_thread_lock(mythread);
-    }
+    io->result = result;
+    semaphore_release(&io->sem);
+    
+    printf("%s() exit\n", __func__);
+
+    return 0;
+}
+
+ssize_t io_trigger_and_wait(enum io_dir dir, int fd, const void *buf, size_t count)
+{
+    struct sim_io io;
+    SDL_Thread *t;
+
+    io.cmd = dir;
+    io.fd = fd;
+    io.buf = buf;
+    io.count = count;
+
+    semaphore_init(&io.sem, 2, 0);
+
+    printf("createThread()\n");
+
+    t = SDL_CreateThread(sim_io_thread_fn, &io);
+    if (!t) return -1;
 
-    return result;
+    printf("wait()\n");
+
+    semaphore_wait(&io.sem, TIMEOUT_BLOCK);
+
+    printf("wait() ret\n");
+    return io.result;
 }
 
 #if !defined(__PCTOOL__) && !defined(APPLICATION)
@@ -445,37 +454,18 @@ int sim_creat(const char *name, mode_t mode)
 
 ssize_t sim_read(int fd, void *buf, size_t count)
 {
-    ssize_t result;
-
-    mutex_lock(&io.sim_mutex);
-
-    /* Setup parameters */
-    io.fd = fd;
-    io.buf = buf;
-    io.count = count;
-
-    result = io_trigger_and_wait(IO_READ);
-
-    mutex_unlock(&io.sim_mutex);
-
-    return result;
+    /* direct call for small amounts */
+    if (count < IO_YIELD_THRESHOLD)
+        return read(fd, buf, count);
+    return io_trigger_and_wait(IO_READ, fd, buf, count);
 }
 
 ssize_t sim_write(int fd, const void *buf, size_t count)
 {
-    ssize_t result;
-
-    mutex_lock(&io.sim_mutex);
-
-    io.fd = fd;
-    io.buf = (void*)buf;
-    io.count = count;
-
-    result = io_trigger_and_wait(IO_WRITE);
-
-    mutex_unlock(&io.sim_mutex);
-
-    return result;
+    /* direct call for small amounts */
+    if (count < IO_YIELD_THRESHOLD)
+        return write(fd, buf, count);
+    return io_trigger_and_wait(IO_WRITE, fd, buf, count);
 }
 
 int sim_mkdir(const char *name)