[PATCH,NON-LINUX] Synchronize bits/sched.h with ./sysdeps/unix/sysv/linux/bits/sched.h

[Samuel Thibault <samuel dot thibault at ens-lyon dot org>]

2011-01-30  Samuel Thibault  <samuel.thibault@ens-lyon.org>

        This brings the variable-size cpu_set_t manipulation macros from
        ./sysdeps/unix/sysv/linux/bits/sched.h

        * bits/sched.h (__CPU_ZERO, __CPU_SET, __CPU_CLR, __CPU_ISSET,
        __CPU_COUNT): Remove old macros.
        (__CPU_ZERO_S, __CPU_SET_S, __CPU_CLR_S, __CPU_ISSET_S,
        __CPU_COUNT, __CPU_EQUAL_S, __CPU_OP_S, __CPU_ALLOC_SIZE,
        __CPU_ALLOC, __CPU_FREE): Add macros.
	(__sched_cpualloc, __sched_cpufree): Add declarations.

---
 sched.h |   87 ++++++++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 72 insertions(+), 15 deletions(-)

diff --git a/bits/sched.h b/bits/sched.h
index a068e50..9a22ae3 100644
--- a/bits/sched.h
+++ b/bits/sched.h
@@ -1,6 +1,7 @@
 /* Definitions of constants and data structure for POSIX 1003.1b-1993
    scheduling interface.
-   Copyright (C) 1996, 1997, 2001, 2003, 2007 Free Software Foundation, Inc.
+   Copyright (C) 1996-1999,2001-2003,2005,2006,2007,2008,2009
+   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
@@ -56,7 +57,7 @@ struct __sched_param
 # define __CPU_SETSIZE	1024
 # define __NCPUBITS	(8 * sizeof (__cpu_mask))
 
-/* Type for array elements in 'cpu_set'.  */
+/* Type for array elements in 'cpu_set_t'.  */
 typedef unsigned long int __cpu_mask;
 
 /* Basic access functions.  */
@@ -70,27 +71,83 @@ typedef struct
 } cpu_set_t;
 
 /* Access functions for CPU masks.  */
-# define __CPU_ZERO(cpusetp) \
+# 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 {									      \
-    unsigned int __i;							      \
-    cpu_set *__arr = (cpusetp);						      \
-    for (__i = 0; __i < sizeof (cpu_set) / sizeof (__cpu_mask); ++__i)	      \
-      __arr->__bits[__i] = 0;						      \
+    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)
-# define __CPU_SET(cpu, cpusetp) \
-  ((cpusetp)->__bits[__CPUELT (cpu)] |= __CPUMASK (cpu))
-# define __CPU_CLR(cpu, cpusetp) \
-  ((cpusetp)->__bits[__CPUELT (cpu)] &= ~__CPUMASK (cpu))
-# define __CPU_ISSET(cpu, cpusetp) \
-  (((cpusetp)->__bits[__CPUELT (cpu)] & __CPUMASK (cpu)) != 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 (__bits[__i] != __bits[__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
 
-# define __CPU_COUNT(cpusetp) \
-  __sched_cpucount (sizeof (cpu_set_t), cpusetp)
 #endif