1 files changed, 18 insertions, 0 deletions
diff --git a/src/thread/pthread_setspecific.c b/src/thread/pthread_setspecific.c
new file mode 100644
index 00000000..171cef41
--- /dev/null
+++ b/src/thread/pthread_setspecific.c
@@ -0,0 +1,18 @@
+#include "pthread_impl.h"
+
+int pthread_setspecific(pthread_key_t k, const void *x)
+{
+	struct pthread *self = pthread_self();
+	/* Handle the case of the main thread */
+	if (!self->tsd) {
+		if (!x) return 0;
+		if (!(self->tsd = calloc(sizeof(void *), PTHREAD_KEYS_MAX)))
+			return ENOMEM;
+	}
+	/* Avoid unnecessary COW */
+	if (self->tsd[k] != x) {
+		self->tsd[k] = (void *)x;
+		self->tsd_used = 1;
+	}
+	return 0;
+}