diff options
| author | Ulrich Drepper <drepper@redhat.com> | 2007-07-29 22:43:00 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2007-07-29 22:43:00 +0000 |
| commit | c5705565e5eca6b3c3e65715f5480617337ffc1d (patch) | |
| tree | b7c7dcf47fd7ce41a45d690f692cdc5f4cbd4c33 | |
| parent | 44f08a6ecc9d04fbb97475ebb99eaec26be36f90 (diff) | |
* sysdeps/unix/sysv/linux/bits/sched.h (__CPU_ZERO_S): Optimize
using gcc builtin.
(__CPU_EQUAL_S): Likewise.
| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/bits/sched.h | 16 |
2 files changed, 17 insertions, 3 deletions
@@ -1,5 +1,9 @@ 2007-07-29 Ulrich Drepper <drepper@redhat.com> + * sysdeps/unix/sysv/linux/bits/sched.h (__CPU_ZERO_S): Optimize + using gcc builtin. + (__CPU_EQUAL_S): Likewise. + * posix/Makefile (routines): Add sched_cpualloc and sched_cpufree. (tests): Add tst-cpuset. * posix/sched_cpualloc.c: New file. diff --git a/sysdeps/unix/sysv/linux/bits/sched.h b/sysdeps/unix/sysv/linux/bits/sched.h index b19822c4a3..5eaa2fe528 100644 --- a/sysdeps/unix/sysv/linux/bits/sched.h +++ b/sysdeps/unix/sysv/linux/bits/sched.h @@ -104,7 +104,7 @@ 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. */ @@ -118,7 +118,11 @@ typedef struct } cpu_set_t; /* Access functions for CPU masks. */ -# define __CPU_ZERO_S(setsize, 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 { \ size_t __i; \ size_t __imax = (setsize) / sizeof (__cpu_mask); \ @@ -126,6 +130,7 @@ typedef struct for (__i = 0; __i < __imax; ++__i) \ __arr->__bits[__i] = 0; \ } while (0) +# endif # define __CPU_SET_S(cpu, setsize, cpusetp) \ ({ size_t __cpu = (cpu); \ __cpu < 8 * (setsize) \ @@ -142,7 +147,11 @@ typedef struct # define __CPU_COUNT_S(setsize, cpusetp) \ __sched_cpucount (setsize, cpusetp) -# define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \ +# 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) \ ({ cpu_set_t *__arr1 = (cpusetp1); \ cpu_set_t *__arr2 = (cpusetp2); \ size_t __imax = (setsize) / sizeof (__cpu_mask); \ @@ -151,6 +160,7 @@ typedef struct if (__arr1->__bits[__i] != __arr2->__bits[__i]) \ break; \ __i == __imax; }) +# endif # define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \ ({ cpu_set_t *__dest = (destset); \ |