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| author | Rich Felker <dalias@aerifal.cx> | 2012-05-13 00:44:35 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2012-05-13 00:44:35 -0400 |
| commit | 9a7fac7934975338449b63eb4d0409b472251dfa (patch) | |
| tree | a6d8ac1a26c7b33bebd6aaf189de1624c89c0d42 | |
| parent | e68c51ac46a9f273927aef8dcebc89912ab19ece (diff) | |
| download | musl-9a7fac7934975338449b63eb4d0409b472251dfa.tar.gz | |
let sysconf accurately report # of cpus available
i've been trying out openmp and it seems like it won't be much use
without this...
| -rw-r--r-- | src/conf/sysconf.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/conf/sysconf.c b/src/conf/sysconf.c index 07072ccf..d6691df8 100644 --- a/src/conf/sysconf.c +++ b/src/conf/sysconf.c @@ -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); |