fix build for non linux/BSD platforms.

configure.ac

@@ -2024,6 +2024,15 @@ if test "x$have_sched_setaffinity" = "x1" ; then
   AC_DEFINE([JEMALLOC_HAVE_SCHED_SETAFFINITY], [ ], [ ])
 fi
 
+dnl Check if the pthread_setaffinity_np function exists.
+AC_CHECK_FUNC([pthread_setaffinity_np],
+              [have_pthread_setaffinity_np="1"],
+              [have_pthread_setaffinity_np="0"]
+             )
+if test "x$have_pthread_setaffinity_np" = "x1" ; then
+  AC_DEFINE([JEMALLOC_HAVE_PTHREAD_SETAFFINITY_NP], [ ], [ ])
+fi
+
 dnl Check if the Solaris/BSD issetugid function exists.
 AC_CHECK_FUNC([issetugid],
               [have_issetugid="1"],

include/jemalloc/internal/jemalloc_internal_defs.h.in

@@ -391,6 +391,9 @@
 /* GNU specific sched_setaffinity support */
 #undef JEMALLOC_HAVE_SCHED_SETAFFINITY
 
+/* pthread_setaffinity_np support */
+#undef JEMALLOC_HAVE_PTHREAD_SETAFFINITY_NP
+
 /*
  * If defined, all the features necessary for background threads are present.
  */

src/background_thread.c

@@ -113,9 +113,7 @@ background_thread_info_init(tsdn_t *tsdn, background_thread_info_t *info) {
 
 static inline bool
 set_current_thread_affinity(int cpu) {
-#ifdef __OpenBSD__
+#if defined(JEMALLOC_HAVE_SCHED_SETAFFINITY) || defined(JEMALLOC_HAVE_PTHREAD_SETAFFINITY_NP)
-	return false;
-#else
 #if defined(JEMALLOC_HAVE_SCHED_SETAFFINITY)
 	cpu_set_t cpuset;
 #else
@@ -146,6 +144,8 @@ set_current_thread_affinity(int cpu) {
 #  endif
 	return ret != 0;
 #endif
+#else
+        return false;
 #endif
 }