1# sched_h.m4 serial 12 2dnl Copyright (C) 2008-2021 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7dnl Written by Bruno Haible. 8 9AC_DEFUN([gl_SCHED_H], 10[ 11 dnl Use AC_REQUIRE here, so that the default behavior below is expanded 12 dnl once only, before all statements that occur in other macros. 13 AC_REQUIRE([gl_SCHED_H_DEFAULTS]) 14 15 AC_REQUIRE([AC_CANONICAL_HOST]) 16 17 AC_CHECK_HEADERS_ONCE([sys/cdefs.h]) 18 AC_CHECK_HEADERS([sched.h], [], [], 19 [[#if HAVE_SYS_CDEFS_H 20 #include <sys/cdefs.h> 21 #endif 22 ]]) 23 gl_NEXT_HEADERS([sched.h]) 24 25 if test "$ac_cv_header_sched_h" = yes; then 26 HAVE_SCHED_H=1 27 else 28 HAVE_SCHED_H=0 29 fi 30 AC_SUBST([HAVE_SCHED_H]) 31 32 if test "$HAVE_SCHED_H" = 1; then 33 AC_CHECK_TYPE([struct sched_param], 34 [HAVE_STRUCT_SCHED_PARAM=1], [HAVE_STRUCT_SCHED_PARAM=0], 35 [[#if HAVE_SYS_CDEFS_H 36 #include <sys/cdefs.h> 37 #endif 38 #include <sched.h> 39 ]]) 40 else 41 HAVE_STRUCT_SCHED_PARAM=0 42 case "$host_os" in 43 os2*) 44 dnl On OS/2 kLIBC, struct sched_param is in spawn.h. 45 AC_CHECK_TYPE([struct sched_param], 46 [HAVE_STRUCT_SCHED_PARAM=1], [], 47 [#include <spawn.h>]) 48 ;; 49 vms) 50 dnl On OpenVMS 7.2 or newer, struct sched_param is in pthread.h. 51 AC_CHECK_TYPE([struct sched_param], 52 [HAVE_STRUCT_SCHED_PARAM=1], [], 53 [#include <pthread.h>]) 54 ;; 55 esac 56 fi 57 AC_SUBST([HAVE_STRUCT_SCHED_PARAM]) 58 59 if test "$ac_cv_header_sys_cdefs_h" = yes; then 60 HAVE_SYS_CDEFS_H=1 61 else 62 HAVE_SYS_CDEFS_H=0 63 fi 64 AC_SUBST([HAVE_SYS_CDEFS_H]) 65 66 dnl Ensure the type pid_t gets defined. 67 AC_REQUIRE([AC_TYPE_PID_T]) 68 69 dnl Check for declarations of anything we want to poison if the 70 dnl corresponding gnulib module is not in use, if it is not common 71 dnl enough to be declared everywhere. 72 gl_WARN_ON_USE_PREPARE([[#include <sched.h> 73 ]], [sched_yield]) 74]) 75 76AC_DEFUN([gl_SCHED_MODULE_INDICATOR], 77[ 78 dnl Use AC_REQUIRE here, so that the default settings are expanded once only. 79 AC_REQUIRE([gl_SCHED_H_DEFAULTS]) 80 gl_MODULE_INDICATOR_SET_VARIABLE([$1]) 81 dnl Define it also as a C macro, for the benefit of the unit tests. 82 gl_MODULE_INDICATOR_FOR_TESTS([$1]) 83]) 84 85AC_DEFUN([gl_SCHED_H_DEFAULTS], 86[ 87 GNULIB_SCHED_YIELD=0; AC_SUBST([GNULIB_SCHED_YIELD]) 88 dnl Assume proper GNU behavior unless another module says otherwise. 89 HAVE_SCHED_YIELD=1; AC_SUBST([HAVE_SCHED_YIELD]) 90 REPLACE_SCHED_YIELD=0; AC_SUBST([REPLACE_SCHED_YIELD]) 91]) 92