#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=16cf2fea8d0592eeafaed8b9fa4861a9e7f54ad1'>root</a>/<a href='/guix/log/gnu?id=16cf2fea8d0592eeafaed8b9fa4861a9e7f54ad1'>gnu</a>/<a href='/guix/log/gnu/system?id=16cf2fea8d0592eeafaed8b9fa4861a9e7f54ad1'>system</a>/<a href='/guix/log/gnu/system/keyboard.scm?id=16cf2fea8d0592eeafaed8b9fa4861a9e7f54ad1'>keyboard.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/system/keyboard.scm?id=16cf2fea8d0592eeafaed8b9fa4861a9e7f54ad1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
2f9d2489e'>status: Keep track of the current build phase.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-29 12:09:52 +0100'>2019-01-29</span></td><td><a href='/guix/commit/tests/status.scm?id=73a8681a16869a2b3a9da1c7ba9434e07a204e19'>status: Keep track of build completion as reported by build tools.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-29 12:09:52 +0100'>2019-01-29</span></td><td><a href='/guix/commit/tests/status.scm?id=976ef2d97887d16eab8d4eb9dad811786b04d690'>status: Record more information about builds.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-09 14:47:53 +0100'>2019-01-09</span></td><td><a href='/guix/commit/tests/status.scm?id=a65177a657b0cb36d45f2e8db574ea9c10f89a1f'>maint: Remove 'cond-expand' forms for Guile 2.0.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-10-16 17:12:09 -0500'>2018-10-16</span></td><td><a href='/guix/commit/tests/status.scm?id=278f86a43f1561b1c064ce88da012db414ec7efc'>ui: Fix port-buffering with guile@2.0.</a><span class='msg-avail'>...</span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2018-10-15 23:06:55 +0200'>2018-10-15</span></td><td><a href='/guix/commit/tests/status.scm?id=f9a8fce10f2d99efec7cb1dd0f6c5f0df9d1b2df'>status: Build upon multiplexed build output.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-10-09 18:54:12 +0200'>2018-10-09</span></td><td><a href='/guix/commit/tests/status.scm?id=fe17037b387c6eca0c45f0526d2761e982a192bb'>status: Gracefully handle invalid UTF-8 in build logs.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-27 23:21:53 +0200'>2018-09-27</span></td><td><a href='/guix/commit/tests/status.scm?id=dc0f74e5fc26977a3ee6c4f2aa74a141f4359982'>Add (guix status) and use it for pretty colored output.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>