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let sysconf accurately report # of cpus available

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i've been trying out openmp and it seems like it won't be much use
without this...
This commit is contained in:
Rich Felker
2012-05-13 00:44:35 -04:00
parent e68c51ac46
commit 9a7fac7934
1 changed files with 10 additions and 2 deletions
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src/conf/sysconf.c
+10 -2
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@@ -6,6 +6,7 @@
#define VER (-2)
#define OFLOW (-3)
#define CPUCNT (-4)
#define RLIM(x) (-32768|(RLIMIT_ ## x))
long sysconf(int name)
@@ -94,8 +95,8 @@ long sysconf(int name)
[_SC_THREAD_PRIO_INHERIT] = -1,
[_SC_THREAD_PRIO_PROTECT] = -1,
[_SC_THREAD_PROCESS_SHARED] = VER,
[_SC_NPROCESSORS_CONF] = -1,
[_SC_NPROCESSORS_ONLN] = -1,
[_SC_NPROCESSORS_CONF] = CPUCNT,
[_SC_NPROCESSORS_ONLN] = CPUCNT,
[_SC_PHYS_PAGES] = -1,
[_SC_AVPHYS_PAGES] = -1,
[_SC_ATEXIT_MAX] = -1,
@@ -220,6 +221,13 @@ long sysconf(int name)
} else if (values[name] == OFLOW) {
if (name == _SC_ARG_MAX) return ARG_MAX;
if (name == _SC_SEM_VALUE_MAX) return SEM_VALUE_MAX;
} else if (values[name] == CPUCNT) {
unsigned char set[128] = {1};
int i, cnt;
__syscall(SYS_sched_getaffinity, 0, sizeof set, set);
for (i=cnt=0; i<sizeof set; i++)
for (; set[i]; set[i]&=set[i]-1, cnt++);
return cnt;
} else if (values[name] < OFLOW) {
long lim[2];
__syscall(SYS_getrlimit, values[name]&16383, lim);