#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=8c8fb5c878b0efc02dc92e31e90d40fc4d850937'>root</a>/<a href='/guix/log/gnu?id=8c8fb5c878b0efc02dc92e31e90d40fc4d850937'>gnu</a>/<a href='/guix/log/gnu/services?id=8c8fb5c878b0efc02dc92e31e90d40fc4d850937'>services</a>/<a href='/guix/log/gnu/services/sysctl.scm?id=8c8fb5c878b0efc02dc92e31e90d40fc4d850937'>sysctl.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/services/sysctl.scm?id=8c8fb5c878b0efc02dc92e31e90d40fc4d850937&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-04-29 18:07:16 +0200'>2022-04-29</span></td><td><a href='/guix/commit/gnu/services/sysctl.scm?id=9d7248cd87fbda8c717341a8092780782bef0820'>services: Add missing 'description' fields.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-03-31 15:36:49 +0200'>2021-03-31</span></td><td><a href='/guix/commit/gnu/services/sysctl.scm?id=4f547c50f9bc478fd7c8bb9d481e2e376b969e8a'>services: sysctl: Export &lt;sysctl-configuration&gt; record field accessors.</a><span class='msg-avail'>...</span></td><td>muradm</td></tr>
<tr><td><span title='2021-03-18 12:17:33 +0100'>2021-03-18</span></td><td><a href='/guix/commit/gnu/services/sysctl.scm?id=898489f48e436e45e86e1ba0fcdb6df5cd5a051a'>services: Enable "protected hardlinks" and "protected symlinks" by default.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2019-11-20 21:23:19 +0200'>2019-11-20</span></td><td><a href='/guix/commit/gnu/services/sysctl.scm?id=77ed06a8bf049827c45e6208475ac9527eb423ea'>services: sysctl: Make service one-shot.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-07-18 20:16:03 +0800'>2017-07-18</span></td><td><a href='/guix/commit/gnu/services/sysctl.scm?id=172b3e2cc2d0384970c362e46af8231c63b0b004'>services: sysctl: Fix typo.</a><span class='msg-avail'>...</span></td><td>宋文武</td></tr>
<tr><td><span title='2017-07-04 20:40:51 +0800'>2017-07-04</span></td><td><a href='/guix/commit/gnu/services/sysctl.scm?id=296bf4d5ab1cf7822956205b6d266c2c67ce056c'>services: Add 'sysctl-service-type'.</a><span class='msg-avail'>...</span></td><td>宋文武</td></tr>