--- /dev/null
+/*
+ * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/* This must be the first #include file */
+#include "../async_locl.h"
+
+#ifdef ASYNC_POSIX
+
+# include <stddef.h>
+# include <unistd.h>
+
+#define STACKSIZE 32768
+
+int ASYNC_is_capable(void)
+{
+ ucontext_t ctx;
+
+ /*
+ * Some platforms provide getcontext() but it does not work (notably
+ * MacOSX PPC64). Check for a working getcontext();
+ */
+ return getcontext(&ctx) == 0;
+}
+
+void async_local_cleanup(void)
+{
+}
+
+int async_fibre_makecontext(async_fibre *fibre)
+{
+ fibre->env_init = 0;
+ if (getcontext(&fibre->fibre) == 0) {
+ fibre->fibre.uc_stack.ss_sp = OPENSSL_malloc(STACKSIZE);
+ if (fibre->fibre.uc_stack.ss_sp != NULL) {
+ fibre->fibre.uc_stack.ss_size = STACKSIZE;
+ fibre->fibre.uc_link = NULL;
+ makecontext(&fibre->fibre, async_start_func, 0);
+ return 1;
+ }
+ } else {
+ fibre->fibre.uc_stack.ss_sp = NULL;
+ }
+ return 0;
+}
+
+void async_fibre_free(async_fibre *fibre)
+{
+ OPENSSL_free(fibre->fibre.uc_stack.ss_sp);
+ fibre->fibre.uc_stack.ss_sp = NULL;
+}
+
+#endif