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affinity operator<<

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This commit is contained in:
Ben Burdette 2020-05-04 14:44:00 -06:00
parent 9c5ece44a7
commit afaa541013
1 changed files with 16 additions and 1 deletions
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17
src/libutil/affinity.cc
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@ -12,6 +12,17 @@ namespace nix {
#if __linux__
static bool didSaveAffinity = false;
static cpu_set_t savedAffinity;
std::ostream& operator<<(std::ostream &os, const cpu_set_t &cset)
{
auto count = CPU_COUNT(&cset);
for (int i=0; i < count; ++i)
{
os << (CPU_ISSET(i,&cset) ? "1" : "0");
}
return os;
}
#endif
@ -47,7 +58,11 @@ void restoreAffinity()
#if __linux__
if (!didSaveAffinity) return;
if (sched_setaffinity(0, sizeof(cpu_set_t), &savedAffinity) == -1)
_printError("failed to restore affinity");
{
std::ostringstream oss;
oss << savedAffinity;
printError("failed to restore CPU affinity %1%", oss.str());
}
#endif
}