+#ifndef _BITS_CPU_SET_H
#include <posix/bits/cpu-set.h>
+
+#ifndef _ISOMAC
+int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp);
+libc_hidden_proto (__sched_cpucount)
+#endif
+
+#endif /* _BITS_CPU_SET_H */
s += countbits (setp->__bits[i]);
return s;
}
+libc_hidden_def (__sched_cpucount)
<https://www.gnu.org/licenses/>. */
-/* We need to define a special parser for /proc/cpuinfo. */
-#define GET_NPROCS_PARSER(FD, BUFFER, CP, RE, BUFFER_END, RESULT) \
- do \
- { \
- /* Find the line that contains the information about the number of \
- active cpus. We don't have to fear extremely long lines since \
- the kernel will not generate them. 8192 bytes are really enough. \
- If there is no "CPUs ..." line then we are on a UP system. */ \
- char *l; \
- (RESULT) = 1; \
- while ((l = next_line (FD, BUFFER, &CP, &RE, BUFFER_END)) != NULL) \
- if ((sscanf (BUFFER, "cpus active : %d", &(RESULT)) == 1) \
- || (sscanf (BUFFER, "CPUs probed %*d active %d", \
- &(RESULT)) == 1)) \
- break; \
- } \
- while (0)
-
-
/* On the Alpha we can distinguish between the number of configured and
active cpus. */
#define GET_NPROCS_CONF_PARSER(FP, BUFFER, RESULT) \
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#include <alloca.h>
-#include <assert.h>
-#include <ctype.h>
#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <mntent.h>
-#include <paths.h>
+#include <not-cancel.h>
+#include <scratch_buffer.h>
#include <stdio.h>
#include <stdio_ext.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
#include <sys/sysinfo.h>
-
-#include <atomic.h>
-#include <not-cancel.h>
-
-
-/* How we can determine the number of available processors depends on
- the configuration. There is currently (as of version 2.0.21) no
- system call to determine the number. It is planned for the 2.1.x
- series to add this, though.
-
- One possibility to implement it for systems using Linux 2.0 is to
- examine the pseudo file /proc/cpuinfo. Here we have one entry for
- each processor.
-
- But not all systems have support for the /proc filesystem. If it
- is not available we simply return 1 since there is no way. */
-
-
-/* Other architectures use different formats for /proc/cpuinfo. This
- provides a hook for alternative parsers. */
-#ifndef GET_NPROCS_PARSER
-# define GET_NPROCS_PARSER(FD, BUFFER, CP, RE, BUFFER_END, RESULT) \
- do \
- { \
- (RESULT) = 0; \
- /* Read all lines and count the lines starting with the string \
- "processor". We don't have to fear extremely long lines since \
- the kernel will not generate them. 8192 bytes are really \
- enough. */ \
- char *l; \
- while ((l = next_line (FD, BUFFER, &CP, &RE, BUFFER_END)) != NULL) \
- if (strncmp (l, "processor", 9) == 0) \
- ++(RESULT); \
- } \
- while (0)
-#endif
-
-
-static char *
-next_line (int fd, char *const buffer, char **cp, char **re,
- char *const buffer_end)
-{
- char *res = *cp;
- char *nl = memchr (*cp, '\n', *re - *cp);
- if (nl == NULL)
- {
- if (*cp != buffer)
- {
- if (*re == buffer_end)
- {
- memmove (buffer, *cp, *re - *cp);
- *re = buffer + (*re - *cp);
- *cp = buffer;
-
- ssize_t n = __read_nocancel (fd, *re, buffer_end - *re);
- if (n < 0)
- return NULL;
-
- *re += n;
-
- nl = memchr (*cp, '\n', *re - *cp);
- while (nl == NULL && *re == buffer_end)
- {
- /* Truncate too long lines. */
- *re = buffer + 3 * (buffer_end - buffer) / 4;
- n = __read_nocancel (fd, *re, buffer_end - *re);
- if (n < 0)
- return NULL;
-
- nl = memchr (*re, '\n', n);
- **re = '\n';
- *re += n;
- }
- }
- else
- nl = memchr (*cp, '\n', *re - *cp);
-
- res = *cp;
- }
-
- if (nl == NULL)
- nl = *re - 1;
- }
-
- *cp = nl + 1;
- assert (*cp <= *re);
-
- return res == *re ? NULL : res;
-}
-
+#include <sysdep.h>
int
__get_nprocs (void)
{
- static int cached_result = -1;
- static time_t timestamp;
-
- time_t now = time_now ();
- time_t prev = timestamp;
- atomic_read_barrier ();
- if (now == prev && cached_result > -1)
- return cached_result;
-
- /* XXX Here will come a test for the new system call. */
-
- const size_t buffer_size = __libc_use_alloca (8192) ? 8192 : 512;
- char *buffer = alloca (buffer_size);
- char *buffer_end = buffer + buffer_size;
- char *cp = buffer_end;
- char *re = buffer_end;
+ struct scratch_buffer set;
+ scratch_buffer_init (&set);
- const int flags = O_RDONLY | O_CLOEXEC;
- /* This file contains comma-separated ranges. */
- int fd = __open_nocancel ("/sys/devices/system/cpu/online", flags);
- char *l;
- int result = 0;
- if (fd != -1)
+ int r;
+ while (true)
{
- l = next_line (fd, buffer, &cp, &re, buffer_end);
- if (l != NULL)
- do
- {
- char *endp;
- unsigned long int n = strtoul (l, &endp, 10);
- if (l == endp)
- {
- result = 0;
- break;
- }
-
- unsigned long int m = n;
- if (*endp == '-')
- {
- l = endp + 1;
- m = strtoul (l, &endp, 10);
- if (l == endp)
- {
- result = 0;
- break;
- }
- }
-
- result += m - n + 1;
-
- l = endp;
- if (l < re && *l == ',')
- ++l;
- }
- while (l < re && *l != '\n');
-
- __close_nocancel_nostatus (fd);
-
- if (result > 0)
- goto out;
+ /* The possible error are EFAULT for an invalid buffer or ESRCH for
+ invalid pid, none could happen. */
+ r = INTERNAL_SYSCALL_CALL (sched_getaffinity, 0, set.length,
+ set.data);
+ if (r > 0)
+ break;
+
+ if (!scratch_buffer_grow (&set))
+ /* Default to an SMP system in case we cannot obtain an accurate
+ number. */
+ return 2;
}
- cp = buffer_end;
- re = buffer_end;
-
- /* Default to an SMP system in case we cannot obtain an accurate
- number. */
- result = 2;
+ /* The scratch_buffer is aligned to max_align_t. */
+ r = __sched_cpucount (r, (const cpu_set_t *) set.data);
- /* The /proc/stat format is more uniform, use it by default. */
- fd = __open_nocancel ("/proc/stat", flags);
- if (fd != -1)
- {
- result = 0;
-
- while ((l = next_line (fd, buffer, &cp, &re, buffer_end)) != NULL)
- /* The current format of /proc/stat has all the cpu* entries
- at the front. We assume here that stays this way. */
- if (strncmp (l, "cpu", 3) != 0)
- break;
- else if (isdigit (l[3]))
- ++result;
+ scratch_buffer_free (&set);
- __close_nocancel_nostatus (fd);
- }
- else
- {
- fd = __open_nocancel ("/proc/cpuinfo", flags);
- if (fd != -1)
- {
- GET_NPROCS_PARSER (fd, buffer, cp, re, buffer_end, result);
- __close_nocancel_nostatus (fd);
- }
- }
-
- out:
- cached_result = result;
- atomic_write_barrier ();
- timestamp = now;
-
- return result;
+ return r;
}
libc_hidden_def (__get_nprocs)
weak_alias (__get_nprocs, get_nprocs)
+++ /dev/null
-/* Determine various system internal values, Linux/m68k version.
- Copyright (C) 2003-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Andreas Schwab <schwab@suse.de>
-
- 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
- <https://www.gnu.org/licenses/>. */
-
-
-/* We need to define a special parser for /proc/cpuinfo. */
-#define GET_NPROCS_PARSER(FD, BUFFER, CP, RE, BUFFER_END, RESULT) \
- do \
- { \
- (RESULT) = 0; \
- /* Read all lines and count the lines starting with the string \
- "CPU:". We don't have to fear extremely long lines since \
- the kernel will not generate them. 8192 bytes are really \
- enough. */ \
- char *l; \
- while ((l = next_line (FD, BUFFER, &CP, &RE, BUFFER_END)) != NULL) \
- if (strncmp (l, "CPU:", 4) == 0) \
- ++(RESULT); \
- } \
- while (0)
-
-#include <sysdeps/unix/sysv/linux/getsysstats.c>
+++ /dev/null
-/* Copyright (C) 1997-2021 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
- <https://www.gnu.org/licenses/>. */
-
-/* We need to define a special parser for /proc/cpuinfo. */
-#define GET_NPROCS_PARSER(FD, BUFFER, CP, RE, BUFFER_END, RESULT) \
- do \
- { \
- (RESULT) = 0; \
- /* Read all lines and count the lines starting with the string \
- "CPU-Family:". We don't have to fear extremely long lines since \
- the kernel will not generate them. 8192 bytes are really enough. */ \
- char *l; \
- while ((l = next_line (FD, BUFFER, &CP, &RE, BUFFER_END)) != NULL) \
- if (strncmp (l, "CPU-Family:", 11) == 0) \
- ++(RESULT); \
- } \
- while (0)
-
-#include <sysdeps/unix/sysv/linux/getsysstats.c>
+++ /dev/null
-/* Determine various system internal values, Linux/MIPS version.
- Copyright (C) 2001-2021 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
- <https://www.gnu.org/licenses/>. */
-
-
-/* We need to define a special parser for /proc/cpuinfo. */
-#define GET_NPROCS_PARSER(FD, BUFFER, CP, RE, BUFFER_END, RESULT) \
- do \
- { \
- (RESULT) = 0; \
- /* Read all lines and count the lines starting with the string \
- "cpu model". We don't have to fear extremely long lines since \
- the kernel will not generate them. 8192 bytes are really \
- enough. */ \
- char *l; \
- while ((l = next_line (FD, BUFFER, &CP, &RE, BUFFER_END)) != NULL) \
- if (strncmp (l, "cpu model", 9) == 0) \
- ++(RESULT); \
- } \
- while (0)
-
-#include <sysdeps/unix/sysv/linux/getsysstats.c>
<https://www.gnu.org/licenses/>. */
-/* We need to define a special parser for /proc/cpuinfo. */
-#define GET_NPROCS_PARSER(FD, BUFFER, CP, RE, BUFFER_END, RESULT) \
- do \
- { \
- (RESULT) = 0; \
- /* Find the line that contains the information about the number of \
- active cpus. We don't have to fear extremely long lines since \
- the kernel will not generate them. 8192 bytes are really \
- enough. */ \
- char *l; \
- while ((l = next_line (FD, BUFFER, &CP, &RE, BUFFER_END)) != NULL) \
- if (sscanf (l, "ncpus active : %d", &(RESULT)) == 1) \
- break; \
- } \
- while (0)
-
-
/* On the Sparc we can distinguish between the number of configured and
active cpus. */
#define GET_NPROCS_CONF_PARSER(FP, BUFFER, RESULT) \
git://sourceware.org / glibc.git / commitdiff