#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
}


}
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<div class='path'>path: <a href='/guix/log/?id=6a5d8cadeed9c6b26fffb8db300679245da77e05'>root</a>/<a href='/guix/log/gnu?id=6a5d8cadeed9c6b26fffb8db300679245da77e05'>gnu</a>/<a href='/guix/log/gnu/packages?id=6a5d8cadeed9c6b26fffb8db300679245da77e05'>packages</a>/<a href='/guix/log/gnu/packages/texinfo.scm?id=6a5d8cadeed9c6b26fffb8db300679245da77e05'>texinfo.scm</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/gnu/packages/texinfo.scm?id=6a5d8cadeed9c6b26fffb8db300679245da77e05&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-07-12 23:08:15 +0200'>2020-07-12</span></td><td><a href='/guix/commit/gnu/packages/texinfo.scm?id=b0e7b6992f3f845e83cfbca4d700b51dba50b4d5'>gnu: Remove ".git" from "https://github/…/….git".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-04-23 07:32:57 +0200'>2020-04-23</span></td><td><a href='/guix/commit/gnu/packages/texinfo.scm?id=95c14929a7fbd3c55c5e8756953c2f257625e2b7'>gnu: texinfo: Cross-build fix.</a><span class='msg-avail'>...</span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2020-04-08 13:00:50 +0200'>2020-04-08</span></td><td><a href='/guix/commit/gnu/packages/texinfo.scm?id=27783023993f9272ce422868d14529159c4a5218'>Merge branch 'master' into core-updates</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-04-05 02:04:39 +0200'>2020-04-05</span></td><td><a href='/guix/commit/gnu/packages/texinfo.scm?id=f9f3ac4eda0206b3d42a1e907c59723b69ffe7a8'>gnu: Add texi2html-1.82.</a><span class='msg-avail'>...</span></td><td>Nicolas Goaziou</td></tr>
<tr><td><span title='2020-04-04 15:48:44 +0200'>2020-04-04</span></td><td><a href='/guix/commit/gnu/packages/texinfo.scm?id=f2d97d577d1dd527bbc707d857ccd0de81714420'>gnu: Replace uses of 'gettext' with 'gettext-minimal'.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>