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Diffstat (limited to '')
| -rw-r--r-- | m4/sched_h.m4 | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/m4/sched_h.m4 b/m4/sched_h.m4 new file mode 100644 index 0000000..ce44f7b --- /dev/null +++ b/m4/sched_h.m4 @@ -0,0 +1,106 @@ +# sched_h.m4 serial 15 +dnl Copyright (C) 2008-2022 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +dnl Written by Bruno Haible. + +AC_DEFUN_ONCE([gl_SCHED_H], +[ + dnl Ensure to expand the default settings once only, before all statements + dnl that occur in other macros. + AC_REQUIRE([gl_SCHED_H_DEFAULTS]) + + AC_REQUIRE([AC_CANONICAL_HOST]) + + AC_CHECK_HEADERS_ONCE([sys/cdefs.h]) + AC_CHECK_HEADERS([sched.h], [], [], + [[#if HAVE_SYS_CDEFS_H + #include <sys/cdefs.h> + #endif + ]]) + gl_NEXT_HEADERS([sched.h]) + + if test "$ac_cv_header_sched_h" = yes; then + HAVE_SCHED_H=1 + else + HAVE_SCHED_H=0 + fi + AC_SUBST([HAVE_SCHED_H]) + + if test "$HAVE_SCHED_H" = 1; then + AC_CHECK_TYPE([struct sched_param], + [HAVE_STRUCT_SCHED_PARAM=1], [HAVE_STRUCT_SCHED_PARAM=0], + [[#if HAVE_SYS_CDEFS_H + #include <sys/cdefs.h> + #endif + #include <sched.h> + ]]) + else + HAVE_STRUCT_SCHED_PARAM=0 + case "$host_os" in + os2*) + dnl On OS/2 kLIBC, struct sched_param is in spawn.h. + AC_CHECK_TYPE([struct sched_param], + [HAVE_STRUCT_SCHED_PARAM=1], [], + [#include <spawn.h>]) + ;; + vms) + dnl On OpenVMS 7.2 or newer, struct sched_param is in pthread.h. + AC_CHECK_TYPE([struct sched_param], + [HAVE_STRUCT_SCHED_PARAM=1], [], + [#include <pthread.h>]) + ;; + esac + fi + AC_SUBST([HAVE_STRUCT_SCHED_PARAM]) + + if test "$ac_cv_header_sys_cdefs_h" = yes; then + HAVE_SYS_CDEFS_H=1 + else + HAVE_SYS_CDEFS_H=0 + fi + AC_SUBST([HAVE_SYS_CDEFS_H]) + + dnl Ensure the type pid_t gets defined. + AC_REQUIRE([AC_TYPE_PID_T]) + + dnl Check for declarations of anything we want to poison if the + dnl corresponding gnulib module is not in use, if it is not common + dnl enough to be declared everywhere. + gl_WARN_ON_USE_PREPARE([[#include <sched.h> + ]], [sched_yield]) +]) + +# gl_SCHED_MODULE_INDICATOR([modulename]) +# sets the shell variable that indicates the presence of the given module +# to a C preprocessor expression that will evaluate to 1. +# This macro invocation must not occur in macros that are AC_REQUIREd. +AC_DEFUN([gl_SCHED_MODULE_INDICATOR], +[ + dnl Ensure to expand the default settings once only. + gl_SCHED_H_REQUIRE_DEFAULTS + gl_MODULE_INDICATOR_SET_VARIABLE([$1]) + dnl Define it also as a C macro, for the benefit of the unit tests. + gl_MODULE_INDICATOR_FOR_TESTS([$1]) +]) + +# Initializes the default values for AC_SUBSTed shell variables. +# This macro must not be AC_REQUIREd. It must only be invoked, and only +# outside of macros or in macros that are not AC_REQUIREd. +AC_DEFUN([gl_SCHED_H_REQUIRE_DEFAULTS], +[ + m4_defun(GL_MODULE_INDICATOR_PREFIX[_SCHED_H_MODULE_INDICATOR_DEFAULTS], [ + gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SCHED_YIELD]) + ]) + m4_require(GL_MODULE_INDICATOR_PREFIX[_SCHED_H_MODULE_INDICATOR_DEFAULTS]) + AC_REQUIRE([gl_SCHED_H_DEFAULTS]) +]) + +AC_DEFUN([gl_SCHED_H_DEFAULTS], +[ + dnl Assume proper GNU behavior unless another module says otherwise. + HAVE_SCHED_YIELD=1; AC_SUBST([HAVE_SCHED_YIELD]) + REPLACE_SCHED_YIELD=0; AC_SUBST([REPLACE_SCHED_YIELD]) +]) |