correctly detect adaptive mutexes in pthreads

PTHREAD_MUTEX_ADAPTIVE_NP is an enum on glibc and not a macro,
we must test for their existence by attempting compilation.

configure.ac

@@ -1399,6 +1399,18 @@ if test "x${je_cv_glibc_memalign_hook}" = "xyes" ; then
   AC_DEFINE([JEMALLOC_GLIBC_MEMALIGN_HOOK], [ ])
 fi
 
+JE_COMPILABLE([pthreads adaptive mutexes], [
+#include <pthread.h>
+], [
+  pthread_mutexattr_t attr;
+  pthread_mutexattr_init(&attr);
+  pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP);
+  pthread_mutexattr_destroy(&attr);
+], [je_cv_pthread_mutex_adaptive_np])
+if test "x${je_cv_pthread_mutex_adaptive_np}" = "xyes" ; then
+  AC_DEFINE([JEMALLOC_HAVE_PTHREAD_MUTEX_ADAPTIVE_NP], [ ])
+fi
+
 dnl ============================================================================
 dnl Check for typedefs, structures, and compiler characteristics.
 AC_HEADER_STDBOOL

include/jemalloc/internal/jemalloc_internal_defs.h.in

@@ -215,4 +215,7 @@
 /* glibc memalign hook */
 #undef JEMALLOC_GLIBC_MEMALIGN_HOOK
 
+/* adaptive mutex support in pthreads */
+#undef JEMALLOC_HAVE_PTHREAD_MUTEX_ADAPTIVE_NP
+
 #endif /* JEMALLOC_INTERNAL_DEFS_H_ */

include/jemalloc/internal/mutex.h

@@ -10,7 +10,7 @@ typedef struct malloc_mutex_s malloc_mutex_t;
 #elif (defined(JEMALLOC_MUTEX_INIT_CB))
 #  define MALLOC_MUTEX_INITIALIZER {PTHREAD_MUTEX_INITIALIZER, NULL}
 #else
-#  if (defined(PTHREAD_MUTEX_ADAPTIVE_NP) &&				\
+#  if (defined(JEMALLOC_HAVE_PTHREAD_MUTEX_ADAPTIVE_NP) &&		\
        defined(PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP))
 #    define MALLOC_MUTEX_TYPE PTHREAD_MUTEX_ADAPTIVE_NP
 #    define MALLOC_MUTEX_INITIALIZER {PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP}