Remove __need_schedparam and __cpu_set_t_defined.

bits/sched.h has logic to expose only an impl-namespace variant of
struct sched_param (i.e. struct __sched_param), but nothing uses it,
and the only header that includes bits/sched.h is sched.h.  The
__need_schedparam logic can therefore be removed.

bits/sched.h also has a great deal of code relating to cpu_set_t
objects that was *almost* the same between the two versions of
bits/sched.h in the tree; a little spelunking indicated that this is
because some bug fixes got applied to the Linux-specific bits/sched.h
but not the generic one.  Introduce a new header, bits/cpu-set.h,
containing the version of that code with the bugfixes, have sched.h
include it directly, and delete all of the code from both versions of
bits/sched.h.

Also remove the unnecessary name mangling in the definition of struct
sched_param -- POSIX specifies a field 'sched_priority', so there is
no reason to define it as '__sched_priority' and then paper over that
with a macro.  (Just in case someone was using the internal name,
'sched_priority' remains a macro defined to expand to itself, and
'__sched_priority' now expands to 'sched_priority'.)

Finally, as long as I'm touching these files anyway, merge new
constants from linux/sched.h into the Linux bits/sched.h.

	* bits/sched.h: Remove __need_schedparam logic and replace with a
	normal multiple-include guard.  Change field name in struct
	sched_param from __sched_priority to sched_priority.  Delete
	everything under #ifndef __cpu_set_t_defined.
	* sysdeps/unix/sysv/linux/bits/sched.h: Likewise.  Also sync with
	kernel sched.h, adding SCHED_ISO and SCHED_DEADLINE constants.

	* posix/sched.h: Include bits/cpu-set.h as well as bits/sched.h.
	For compatibility, #define sched_priority to itself, and #define
	__sched_priority as sched_priority.
	* posix/bits/cpu-set.h: New file containing, verbatim, the code
	that was under #ifndef __cpu_set_t_defined in
	sysdeps/unix/sysv/linux/bits/sched.h.
	* include/bits/cpu-set.h: New wrapper.
	* posix/Makefile: Install bits/cpu-set.h.

7 files changed, 163 insertions, 243 deletions

diff --git a/ChangeLog b/ChangeLog
index 0a21fa51f4..bcd4e451b2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,21 @@
+2017-06-12  Zack Weinberg  <zackw@panix.com>
+
+	* bits/sched.h: Remove __need_schedparam logic and replace with a
+	normal multiple-include guard.  Change field name in struct
+	sched_param from __sched_priority to sched_priority.  Delete
+	everything under #ifndef __cpu_set_t_defined.
+	* sysdeps/unix/sysv/linux/bits/sched.h: Likewise.  Also sync with
+	kernel sched.h, adding SCHED_ISO and SCHED_DEADLINE constants.
+
+	* posix/sched.h: Include bits/cpu-set.h as well as bits/sched.h.
+	For compatibility, #define sched_priority to itself, and #define
+	__sched_priority as sched_priority.
+	* posix/bits/cpu-set.h: New file containing, verbatim, the code
+	that was under #ifndef __cpu_set_t_defined in
+	sysdeps/unix/sysv/linux/bits/sched.h.
+	* include/bits/cpu-set.h: New wrapper.
+	* posix/Makefile: Install bits/cpu-set.h.
+
 2017-06-12  Paul E. Murphy  <murphyp@linux.vnet.ibm.com>
 	    Gabriel F. T. Gomes  <gftg@linux.vnet.ibm.com>
 	    Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>
diff --git a/bits/sched.h b/bits/sched.h
index c36c569db3..0588f3142e 100644
--- a/bits/sched.h
+++ b/bits/sched.h
@@ -17,13 +17,13 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#ifndef __need_schedparam
+#ifndef _BITS_SCHED_H
+#define _BITS_SCHED_H 1
 
 #ifndef _SCHED_H
 # error "Never include <bits/sched.h> directly; use <sched.h> instead."
 #endif
 
-
 /* Scheduling algorithms.  */
 #define SCHED_OTHER	0
 #define SCHED_FIFO	1
@@ -32,120 +32,7 @@
 /* Data structure to describe a process' schedulability.  */
 struct sched_param
 {
-  int __sched_priority;
+  int sched_priority;
 };
 
-#endif	/* need schedparam */
-
-#if !defined __defined_schedparam \
-    && (defined __need_schedparam || defined _SCHED_H)
-# define __defined_schedparam	1
-/* Data structure to describe a process' schedulability.  */
-struct __sched_param
-  {
-    int __sched_priority;
-  };
-# undef __need_schedparam
-#endif
-
-
-#if defined _SCHED_H && !defined __cpu_set_t_defined
-# define __cpu_set_t_defined
-/* Size definition for CPU sets.  */
-# define __CPU_SETSIZE	1024
-# define __NCPUBITS	(8 * sizeof (__cpu_mask))
-
-/* Type for array elements in 'cpu_set_t'.  */
-typedef unsigned long int __cpu_mask;
-
-/* Basic access functions.  */
-# define __CPUELT(cpu)	((cpu) / __NCPUBITS)
-# define __CPUMASK(cpu)	((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
-
-/* Data structure to describe CPU mask.  */
-typedef struct
-{
-  __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
-} cpu_set_t;
-
-/* Access functions for CPU masks.  */
-# if __GNUC_PREREQ (2, 91)
-#  define __CPU_ZERO_S(setsize, cpusetp) \
-  do __builtin_memset (cpusetp, '\0', setsize); while (0)
-# else
-#  define __CPU_ZERO_S(setsize, cpusetp) \
-  do {									      \
-    size_t __i;								      \
-    size_t __imax = (setsize) / sizeof (__cpu_mask);			      \
-    __cpu_mask *__bits = (cpusetp)->__bits;				      \
-    for (__i = 0; __i < __imax; ++__i)					      \
-      __bits[__i] = 0;							      \
-  } while (0)
-# endif
-# define __CPU_SET_S(cpu, setsize, cpusetp) \
-  (__extension__							      \
-   ({ size_t __cpu = (cpu);						      \
-      __cpu < 8 * (setsize)						      \
-      ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]		      \
-	 |= __CPUMASK (__cpu))						      \
-      : 0; }))
-# define __CPU_CLR_S(cpu, setsize, cpusetp) \
-  (__extension__							      \
-   ({ size_t __cpu = (cpu);						      \
-      __cpu < 8 * (setsize)						      \
-      ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]		      \
-	 &= ~__CPUMASK (__cpu))						      \
-      : 0; }))
-# define __CPU_ISSET_S(cpu, setsize, cpusetp) \
-  (__extension__							      \
-   ({ size_t __cpu = (cpu);						      \
-      __cpu < 8 * (setsize)						      \
-      ? ((((const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]      \
-	  & __CPUMASK (__cpu))) != 0					      \
-      : 0; }))
-
-# define __CPU_COUNT_S(setsize, cpusetp) \
-  __sched_cpucount (setsize, cpusetp)
-
-# if __GNUC_PREREQ (2, 91)
-#  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
-  (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
-# else
-#  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
-  (__extension__							      \
-   ({ const __cpu_mask *__arr1 = (cpusetp1)->__bits;			      \
-      const __cpu_mask *__arr2 = (cpusetp2)->__bits;			      \
-      size_t __imax = (setsize) / sizeof (__cpu_mask);			      \
-      size_t __i;							      \
-      for (__i = 0; __i < __imax; ++__i)				      \
-	if (__arr1[__i] != __arr2[__i])					      \
-	  break;							      \
-      __i == __imax; }))
-# endif
-
-# define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
-  (__extension__							      \
-   ({ cpu_set_t *__dest = (destset);					      \
-      const __cpu_mask *__arr1 = (srcset1)->__bits;			      \
-      const __cpu_mask *__arr2 = (srcset2)->__bits;			      \
-      size_t __imax = (setsize) / sizeof (__cpu_mask);			      \
-      size_t __i;							      \
-      for (__i = 0; __i < __imax; ++__i)				      \
-	((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i];    \
-      __dest; }))
-
-# define __CPU_ALLOC_SIZE(count) \
-  ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
-# define __CPU_ALLOC(count) __sched_cpualloc (count)
-# define __CPU_FREE(cpuset) __sched_cpufree (cpuset)
-
-__BEGIN_DECLS
-
-extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
-     __THROW;
-extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
-extern void __sched_cpufree (cpu_set_t *__set) __THROW;
-
-__END_DECLS
-
-#endif
+#endif /* bits/sched.h */
diff --git a/include/bits/cpu-set.h b/include/bits/cpu-set.h
new file mode 100644
index 0000000000..388f03cfbd
--- /dev/null
+++ b/include/bits/cpu-set.h
@@ -0,0 +1 @@
+#include <posix/bits/cpu-set.h>
diff --git a/posix/Makefile b/posix/Makefile
index 52b022cf66..1c328b81af 100644
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -30,8 +30,8 @@ headers	:= sys/utsname.h sys/times.h sys/wait.h sys/types.h unistd.h	      \
 	   bits/posix1_lim.h bits/posix2_lim.h bits/posix_opt.h		      \
 	   bits/local_lim.h tar.h bits/utsname.h bits/confname.h	      \
 	   bits/waitflags.h bits/waitstatus.h sys/unistd.h sched.h	      \
-	   bits/sched.h re_comp.h wait.h bits/environments.h cpio.h	      \
-	   spawn.h bits/unistd.h
+	   bits/sched.h bits/cpu-set.h re_comp.h wait.h bits/environments.h   \
+	   cpio.h spawn.h bits/unistd.h
 
 routines :=								      \
 	uname								      \
diff --git a/posix/bits/cpu-set.h b/posix/bits/cpu-set.h
new file mode 100644
index 0000000000..f9b11b9714
--- /dev/null
+++ b/posix/bits/cpu-set.h
@@ -0,0 +1,124 @@
+/* Definition of the cpu_set_t structure used by the POSIX 1003.1b-1993
+   scheduling interface.
+   Copyright (C) 1996-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_CPU_SET_H
+#define _BITS_CPU_SET_H 1
+
+#ifndef _SCHED_H
+# error "Never include <bits/cpu-set.h> directly; use <sched.h> instead."
+#endif
+
+/* Size definition for CPU sets.  */
+# define __CPU_SETSIZE	1024
+# define __NCPUBITS	(8 * sizeof (__cpu_mask))
+
+/* Type for array elements in 'cpu_set_t'.  */
+typedef __CPU_MASK_TYPE __cpu_mask;
+
+/* Basic access functions.  */
+# define __CPUELT(cpu)	((cpu) / __NCPUBITS)
+# define __CPUMASK(cpu)	((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
+
+/* Data structure to describe CPU mask.  */
+typedef struct
+{
+  __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
+} cpu_set_t;
+
+/* Access functions for CPU masks.  */
+# if __GNUC_PREREQ (2, 91)
+#  define __CPU_ZERO_S(setsize, cpusetp) \
+  do __builtin_memset (cpusetp, '\0', setsize); while (0)
+# else
+#  define __CPU_ZERO_S(setsize, cpusetp) \
+  do {									      \
+    size_t __i;								      \
+    size_t __imax = (setsize) / sizeof (__cpu_mask);			      \
+    __cpu_mask *__bits = (cpusetp)->__bits;				      \
+    for (__i = 0; __i < __imax; ++__i)					      \
+      __bits[__i] = 0;							      \
+  } while (0)
+# endif
+# define __CPU_SET_S(cpu, setsize, cpusetp) \
+  (__extension__							      \
+   ({ size_t __cpu = (cpu);						      \
+      __cpu / 8 < (setsize)						      \
+      ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]		      \
+	 |= __CPUMASK (__cpu))						      \
+      : 0; }))
+# define __CPU_CLR_S(cpu, setsize, cpusetp) \
+  (__extension__							      \
+   ({ size_t __cpu = (cpu);						      \
+      __cpu / 8 < (setsize)						      \
+      ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]		      \
+	 &= ~__CPUMASK (__cpu))						      \
+      : 0; }))
+# define __CPU_ISSET_S(cpu, setsize, cpusetp) \
+  (__extension__							      \
+   ({ size_t __cpu = (cpu);						      \
+      __cpu / 8 < (setsize)						      \
+      ? ((((const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]	      \
+	  & __CPUMASK (__cpu))) != 0					      \
+      : 0; }))
+
+# define __CPU_COUNT_S(setsize, cpusetp) \
+  __sched_cpucount (setsize, cpusetp)
+
+# if __GNUC_PREREQ (2, 91)
+#  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
+  (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
+# else
+#  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
+  (__extension__							      \
+   ({ const __cpu_mask *__arr1 = (cpusetp1)->__bits;			      \
+      const __cpu_mask *__arr2 = (cpusetp2)->__bits;			      \
+      size_t __imax = (setsize) / sizeof (__cpu_mask);			      \
+      size_t __i;							      \
+      for (__i = 0; __i < __imax; ++__i)				      \
+	if (__arr1[__i] != __arr2[__i])					      \
+	  break;							      \
+      __i == __imax; }))
+# endif
+
+# define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
+  (__extension__							      \
+   ({ cpu_set_t *__dest = (destset);					      \
+      const __cpu_mask *__arr1 = (srcset1)->__bits;			      \
+      const __cpu_mask *__arr2 = (srcset2)->__bits;			      \
+      size_t __imax = (setsize) / sizeof (__cpu_mask);			      \
+      size_t __i;							      \
+      for (__i = 0; __i < __imax; ++__i)				      \
+	((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i];    \
+      __dest; }))
+
+# define __CPU_ALLOC_SIZE(count) \
+  ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
+# define __CPU_ALLOC(count) __sched_cpualloc (count)
+# define __CPU_FREE(cpuset) __sched_cpufree (cpuset)
+
+__BEGIN_DECLS
+
+extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
+     __THROW;
+extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
+extern void __sched_cpufree (cpu_set_t *__set) __THROW;
+
+__END_DECLS
+
+#endif /* bits/cpu-set.h */
diff --git a/posix/sched.h b/posix/sched.h
index 7037ab398d..d5cdac37b0 100644
--- a/posix/sched.h
+++ b/posix/sched.h
@@ -39,11 +39,13 @@ typedef __pid_t pid_t;
 # define __pid_t_defined
 #endif
 
-
 /* Get system specific constant and data structure definitions.  */
 #include <bits/sched.h>
-/* Define the real names for the elements of `struct sched_param'.  */
-#define sched_priority	__sched_priority
+#include <bits/cpu-set.h>
+
+/* Backward compatibility.  */
+#define sched_priority    sched_priority
+#define __sched_priority  sched_priority
 
 
 __BEGIN_DECLS
diff --git a/sysdeps/unix/sysv/linux/bits/sched.h b/sysdeps/unix/sysv/linux/bits/sched.h
index cc0d698f34..6d23e94ae6 100644
--- a/sysdeps/unix/sysv/linux/bits/sched.h
+++ b/sysdeps/unix/sysv/linux/bits/sched.h
@@ -17,20 +17,22 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#ifndef __need_schedparam
+#ifndef _BITS_SCHED_H
+#define _BITS_SCHED_H 1
 
 #ifndef _SCHED_H
 # error "Never include <bits/sched.h> directly; use <sched.h> instead."
 #endif
 
-
 /* Scheduling algorithms.  */
 #define SCHED_OTHER		0
 #define SCHED_FIFO		1
 #define SCHED_RR		2
 #ifdef __USE_GNU
 # define SCHED_BATCH		3
+# define SCHED_ISO		4
 # define SCHED_IDLE		5
+# define SCHED_DEADLINE		6
 
 # define SCHED_RESET_ON_FORK	0x40000000
 #endif
@@ -69,11 +71,11 @@
 # define CLONE_IO	0x80000000	/* Clone I/O context.  */
 #endif
 
-/* The official definition.  */
+/* Data structure to describe a process' schedulability.  */
 struct sched_param
-  {
-    int __sched_priority;
-  };
+{
+  int sched_priority;
+};
 
 __BEGIN_DECLS
 
@@ -92,120 +94,6 @@ extern int sched_getcpu (void) __THROW;
 extern int setns (int __fd, int __nstype) __THROW;
 #endif
 
-
-__END_DECLS
-
-#endif	/* need schedparam */
-
-#if !defined __defined_schedparam \
-    && (defined __need_schedparam || defined _SCHED_H)
-# define __defined_schedparam	1
-/* Data structure to describe a process' schedulability.  */
-struct __sched_param
-  {
-    int __sched_priority;
-  };
-# undef __need_schedparam
-#endif
-
-
-#if defined _SCHED_H && !defined __cpu_set_t_defined
-# define __cpu_set_t_defined
-/* Size definition for CPU sets.  */
-# define __CPU_SETSIZE	1024
-# define __NCPUBITS	(8 * sizeof (__cpu_mask))
-
-/* Type for array elements in 'cpu_set_t'.  */
-typedef __CPU_MASK_TYPE __cpu_mask;
-
-/* Basic access functions.  */
-# define __CPUELT(cpu)	((cpu) / __NCPUBITS)
-# define __CPUMASK(cpu)	((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
-
-/* Data structure to describe CPU mask.  */
-typedef struct
-{
-  __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
-} cpu_set_t;
-
-/* Access functions for CPU masks.  */
-# if __GNUC_PREREQ (2, 91)
-#  define __CPU_ZERO_S(setsize, cpusetp) \
-  do __builtin_memset (cpusetp, '\0', setsize); while (0)
-# else
-#  define __CPU_ZERO_S(setsize, cpusetp) \
-  do {									      \
-    size_t __i;								      \
-    size_t __imax = (setsize) / sizeof (__cpu_mask);			      \
-    __cpu_mask *__bits = (cpusetp)->__bits;				      \
-    for (__i = 0; __i < __imax; ++__i)					      \
-      __bits[__i] = 0;							      \
-  } while (0)
-# endif
-# define __CPU_SET_S(cpu, setsize, cpusetp) \
-  (__extension__							      \
-   ({ size_t __cpu = (cpu);						      \
-      __cpu / 8 < (setsize)						      \
-      ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]		      \
-	 |= __CPUMASK (__cpu))						      \
-      : 0; }))
-# define __CPU_CLR_S(cpu, setsize, cpusetp) \
-  (__extension__							      \
-   ({ size_t __cpu = (cpu);						      \
-      __cpu / 8 < (setsize)						      \
-      ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]		      \
-	 &= ~__CPUMASK (__cpu))						      \
-      : 0; }))
-# define __CPU_ISSET_S(cpu, setsize, cpusetp) \
-  (__extension__							      \
-   ({ size_t __cpu = (cpu);						      \
-      __cpu / 8 < (setsize)						      \
-      ? ((((const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]	      \
-	  & __CPUMASK (__cpu))) != 0					      \
-      : 0; }))
-
-# define __CPU_COUNT_S(setsize, cpusetp) \
-  __sched_cpucount (setsize, cpusetp)
-
-# if __GNUC_PREREQ (2, 91)
-#  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
-  (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
-# else
-#  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
-  (__extension__							      \
-   ({ const __cpu_mask *__arr1 = (cpusetp1)->__bits;			      \
-      const __cpu_mask *__arr2 = (cpusetp2)->__bits;			      \
-      size_t __imax = (setsize) / sizeof (__cpu_mask);			      \
-      size_t __i;							      \
-      for (__i = 0; __i < __imax; ++__i)				      \
-	if (__arr1[__i] != __arr2[__i])					      \
-	  break;							      \
-      __i == __imax; }))
-# endif
-
-# define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
-  (__extension__							      \
-   ({ cpu_set_t *__dest = (destset);					      \
-      const __cpu_mask *__arr1 = (srcset1)->__bits;			      \
-      const __cpu_mask *__arr2 = (srcset2)->__bits;			      \
-      size_t __imax = (setsize) / sizeof (__cpu_mask);			      \
-      size_t __i;							      \
-      for (__i = 0; __i < __imax; ++__i)				      \
-	((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i];    \
-      __dest; }))
-
-# define __CPU_ALLOC_SIZE(count) \
-  ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
-# define __CPU_ALLOC(count) __sched_cpualloc (count)
-# define __CPU_FREE(cpuset) __sched_cpufree (cpuset)
-
-__BEGIN_DECLS
-
-extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
-  __THROW;
-extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
-extern void __sched_cpufree (cpu_set_t *__set) __THROW;
-
 __END_DECLS
 
-#endif
+#endif /* bits/sched.h */