diff -r 000000000000 -r 6474c204b198 memory/jemalloc/src/test/thread_tcache_enabled.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/memory/jemalloc/src/test/thread_tcache_enabled.c	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,91 @@
+#define	JEMALLOC_MANGLE
+#include "jemalloc_test.h"
+
+void *
+je_thread_start(void *arg)
+{
+	int err;
+	size_t sz;
+	bool e0, e1;
+
+	sz = sizeof(bool);
+	if ((err = mallctl("thread.tcache.enabled", &e0, &sz, NULL, 0))) {
+		if (err == ENOENT) {
+#ifdef JEMALLOC_TCACHE
+			assert(false);
+#endif
+		}
+		goto label_return;
+	}
+
+	if (e0) {
+		e1 = false;
+		assert(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz)
+		    == 0);
+		assert(e0);
+	}
+
+	e1 = true;
+	assert(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz) == 0);
+	assert(e0 == false);
+
+	e1 = true;
+	assert(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz) == 0);
+	assert(e0);
+
+	e1 = false;
+	assert(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz) == 0);
+	assert(e0);
+
+	e1 = false;
+	assert(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz) == 0);
+	assert(e0 == false);
+
+	free(malloc(1));
+	e1 = true;
+	assert(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz) == 0);
+	assert(e0 == false);
+
+	free(malloc(1));
+	e1 = true;
+	assert(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz) == 0);
+	assert(e0);
+
+	free(malloc(1));
+	e1 = false;
+	assert(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz) == 0);
+	assert(e0);
+
+	free(malloc(1));
+	e1 = false;
+	assert(mallctl("thread.tcache.enabled", &e0, &sz, &e1, sz) == 0);
+	assert(e0 == false);
+
+	free(malloc(1));
+label_return:
+	return (NULL);
+}
+
+int
+main(void)
+{
+	int ret = 0;
+	je_thread_t thread;
+
+	malloc_printf("Test begin\n");
+
+	je_thread_start(NULL);
+
+	je_thread_create(&thread, je_thread_start, NULL);
+	je_thread_join(thread, (void *)&ret);
+
+	je_thread_start(NULL);
+
+	je_thread_create(&thread, je_thread_start, NULL);
+	je_thread_join(thread, (void *)&ret);
+
+	je_thread_start(NULL);
+
+	malloc_printf("Test end\n");
+	return (ret);
+}