diff --git a/test/iom.c b/test/iom.c
new file mode 100644
index 0000000..c0f2748
--- /dev/null
+++ b/test/iom.c
@@ -0,0 +1,60 @@
+#include "io.h"
+#include <stdio.h>
+#include <threads.h>
+#include <unistd.h>
+
+iomux_t c;
+
+int worker(void* arg) {
+  uintptr_t i=(uintptr_t)arg;
+  char buf[100];
+  int64 s;
+  int events;
+
+  write(1,buf,sprintf(buf,"starting thread %ld\n",i));
+
+  switch (iom_wait(&c,&s,&events,1000)) {
+  case -1:
+    perror("iom_wait");
+    return -1;
+  case 0:
+    write(1,buf,sprintf(buf,"timeout in thread %ld\n",i));
+    return 0;
+  case 1:
+    write(1,buf,sprintf(buf,"input found by thread %8ld\n",i));
+    return 1;
+  }
+
+  return 0;
+}
+
+int main() {
+  iom_init(&c);
+  if (iom_add(&c,0,IOM_READ)==-1) {
+    perror("iom_add");
+    return 1;
+  }
+  thrd_t x[4];
+  int i;
+  puts("launching threads");
+  for (i=0; i<4; ++i)
+    if (thrd_create(&x[i],worker,(void*)(uintptr_t)i)==-1) {
+      perror("thrd_create");
+      return 111;
+    }
+
+//  sleep(1);
+//  iom_abort(&c);
+
+  puts("joining threads");
+  int r;
+  for (i=0; i<4; ++i) {
+    if (thrd_join(x[i],&r)==-1) {
+      perror("thrd_join");
+      return 111;
+    }
+    printf("thread %d returned %d\n",i,r);
+  }
+
+  return 0;
+}