#include "types.hh"
#include "util.hh"
#include "affinity.hh"

#if HAVE_SCHED_H
#include <sched.h>
#endif

namespace nix {


#if HAVE_SCHED_SETAFFINITY
static bool didSaveAffinity = false;
static cpu_set_t savedAffinity;
#endif


void setAffinityTo(int cpu)
{
#if HAVE_SCHED_SETAFFINITY
    if (sched_getaffinity(0, sizeof(cpu_set_t), &savedAffinity) == -1) return;
    didSaveAffinity = true;
    printMsg(lvlDebug, format("locking this thread to CPU %1%") % cpu);
    cpu_set_t newAffinity;
    CPU_ZERO(&newAffinity);
    CPU_SET(cpu, &newAffinity);
    if (sched_setaffinity(0, sizeof(cpu_set_t), &newAffinity) == -1)
        printMsg(lvlError, format("failed to lock thread to CPU %1%") % cpu);
#endif
}


int lockToCurrentCPU()
{
#if HAVE_SCHED_SETAFFINITY
    int cpu = sched_getcpu();
    if (cpu != -1) setAffinityTo(cpu);
    return cpu;
#else
    return -1;
#endif
}


void restoreAffinity()
{
#if HAVE_SCHED_SETAFFINITY
    if (!didSaveAffinity) return;
    if (sched_setaffinity(0, sizeof(cpu_set_t), &savedAffinity) == -1)
        printMsg(lvlError, "failed to restore affinity %1%");
#endif
}


}
ummary</a><a href='/guix/refs/?id=e863cf42036cd8d06e96fe29068eb0309e895e43'>refs</a><a class='active' href='/guix/log/tests/guix-graph.sh'>log</a><a href='/guix/tree/tests/guix-graph.sh?id=e863cf42036cd8d06e96fe29068eb0309e895e43'>tree</a><a href='/guix/commit/tests/guix-graph.sh?id=e863cf42036cd8d06e96fe29068eb0309e895e43'>commit</a><a href='/guix/diff/tests/guix-graph.sh?id=e863cf42036cd8d06e96fe29068eb0309e895e43'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/guix-graph.sh'>
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<div class='path'>path: <a href='/guix/log/?id=e863cf42036cd8d06e96fe29068eb0309e895e43'>root</a>/<a href='/guix/log/tests?id=e863cf42036cd8d06e96fe29068eb0309e895e43'>tests</a>/<a href='/guix/log/tests/guix-graph.sh?id=e863cf42036cd8d06e96fe29068eb0309e895e43'>guix-graph.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-graph.sh?id=e863cf42036cd8d06e96fe29068eb0309e895e43&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-01-16 23:56:56 +0100'>2022-01-16</span></td><td><a href='/guix/commit/tests/guix-graph.sh?id=a1037aa87b39d4c774fe398fc97a58bafeb063d1'>tests: Clean up after 'tests/guix-graph.sh'.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes a regression introduced in
a773c3142dd168e1c4480614d3f5fd9d003954cd, which would lead the first
'trap' to be ignored, thereby leaving 't-guix-graph-*' directories
behind it.

* tests/guix-graph.sh: Remove first 'trap' line that had no effect;
replace second 'trap' line.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-09-28 21:06:36 -0500'>2020-09-28</span></td><td><a href='/guix/commit/tests/guix-graph.sh?id=d8934360d2453a403b5433e71d09188e4ed23b57'>tests: Simplify shell exit status negation;</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/guix-archive.sh, tests/guix-build-branch.sh, tests/guix-build.sh,
tests/guix-daemon.sh, tests/guix-download.sh, tests/guix-environment.sh,
tests/guix-gc.sh, tests/guix-git-authenticate.sh, tests/guix-graph.sh,
tests/guix-hash.sh, tests/guix-lint.sh, tests/guix-pack-relocatable.sh,
tests/guix-pack.sh, tests/guix-package-aliases.sh, tests/guix-package-net.sh,
tests/guix-package.sh: Use the shell '!' keyword to negate command exit status
in place of 'if ...; then false; else true; fi'
</span></span></td><td>Eric Bavier</td></tr>