add C11 thread functions operating on tss_t and once_flag

These all have POSIX equivalents, but aside from tss_get, they all
have minor changes to the signature or return value and thus need to
exist as separate functions.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/thread/tss_create.c b/src/thread/tss_create.c
new file mode 100644
index 00000000..251d22b9
--- /dev/null
+++ b/src/thread/tss_create.c
@@ -0,0 +1,11 @@
+#include <threads.h>
+
+int __pthread_key_create(tss_t *, void (*)(void *));
+
+int tss_create(tss_t *tss, tss_dtor_t dtor)
+{
+	/* Different error returns are possible. C glues them together into
+	 * just failure notification. Can't be optimized to a tail call,
+	 * unless thrd_error equals EAGAIN. */
+	return __pthread_key_create(tss, dtor) ? thrd_error : thrd_success;
+}