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# Check for thread local storage support.
# Required when building with DB STL support.
# Based in part on: http://autoconf-archive.cryp.to/ax_tls.html
# by Alan Woodland <ajw05@aber.ac.uk>
AC_DEFUN([AX_TLS], [
AC_MSG_CHECKING(for thread local storage (TLS) class)
AC_SUBST(TLS_decl)
AC_SUBST(TLS_defn)
ac_cv_tls=none
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ax_tls_keywords="__thread __declspec(thread) __declspec(__thread)"
for ax_tls_decl_keyword in $ax_tls_keywords ""; do
for ax_tls_defn_keyword in $ax_tls_keywords ""; do
test -z "$ax_tls_decl_keyword" &&
test -z "$ax_tls_defn_keyword" && continue
AC_TRY_COMPILE([template <typename T>class TLSClass {
public: static ] $ax_tls_decl_keyword [ T *tlsvar;
};
class TLSClass2 {
public: static ] $ax_tls_decl_keyword [int tlsvar;
};
template<typename T> ] $ax_tls_defn_keyword [ T* TLSClass<T>::tlsvar = NULL;]
$ax_tls_defn_keyword [int TLSClass2::tlsvar = 1;
static $ax_tls_decl_keyword int x = 0;],
[TLSClass<int>::tlsvar = NULL; TLSClass2::tlsvar = 1;],
[ac_cv_tls=modifier ; break])
done
test "$ac_cv_tls" = none || break
done
AC_LANG_RESTORE
if test "$ac_cv_tls" = "none" ; then
AC_TRY_COMPILE(
[#include <stdlib.h>
#include <pthread.h>
static pthread_once_t once_control_ = PTHREAD_ONCE_INIT;
static pthread_key_t key;
static void init_once(void) {
pthread_key_create(&key, NULL);
}
static void *get_tls() {
return (void *)pthread_getspecific(&key);
}
static void set_tls(void *p) {
pthread_setspecific(&key, p);
}], [],
[ac_cv_tls=pthread])
fi
case "$ac_cv_tls" in
none) break ;;
pthread)
TLS_decl="#define HAVE_PTHREAD_TLS"
TLS_defn="" ;;
modifier)
TLS_decl="#define TLS_DECL_MODIFIER $ax_tls_decl_keyword"
TLS_defn="#define TLS_DEFN_MODIFIER $ax_tls_defn_keyword" ;;
esac
AC_MSG_RESULT([$ac_cv_tls])
])
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