vpx_once: implement once() for OS/2
Change-Id: I9f736f299490464bbdbb6cd24ee6f5b46ad45ec6
diff --git a/vpx_ports/vpx_once.h b/vpx_ports/vpx_once.h
index 182892a..bd9eebd 100644
--- a/vpx_ports/vpx_once.h
+++ b/vpx_ports/vpx_once.h
@@ -73,6 +73,33 @@
}
+#elif CONFIG_MULTITHREAD && defined(__OS2__)
+#define INCL_DOS
+#include <os2.h>
+static void once(void (*func)(void))
+{
+ static int done;
+
+ /* If the initialization is complete, return early. */
+ if(done)
+ return;
+
+ /* Causes all other threads in the process to block themselves
+ * and give up their time slice.
+ */
+ DosEnterCritSec();
+
+ if (!done)
+ {
+ func();
+ done = 1;
+ }
+
+ /* Restores normal thread dispatching for the current process. */
+ DosExitCritSec();
+}
+
+
#elif CONFIG_MULTITHREAD && HAVE_PTHREAD_H
#include <pthread.h>
static void once(void (*func)(void))
