#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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<tr><td><span title='2022-12-17 17:08:50 +0100'>2022-12-17</span></td><td><a href='/guix/commit/gnu/build/activation.scm?id=4d94cdf69889043dd8d9b1305f5f3946ec0f8ff6'>activation: Firmware activation handles missing support in kernel.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
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<tr><td><span title='2020-06-08 14:12:20 +0200'>2020-06-08</span></td><td><a href='/guix/commit/gnu/build/activation.scm?id=c3fd2df705695a0dc9f393545606360be1ea6104'>system: Support activation service for the Hurd.</a><span class='msg-avail'>...</span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2020-01-06 16:31:54 +0100'>2020-01-06</span></td><td><a href='/guix/commit/gnu/build/activation.scm?id=83460433b94487198750ad0bcc6f3869f68a8c8f'>activation: Check whether /proc/sys/kernel/modprobe exists.</a><span class='msg-avail'>...</span></td><td>kanichos@yandex.ru</td></tr>
<tr><td><span title='2020-01-02 19:42:59 +0100'>2020-01-02</span></td><td><a href='/guix/commit/gnu/build/activation.scm?id=7c4e4bac876190eae90635ba7d7f59892c31bcc6'>activation: Keep going when failing to create one of the setuid programs.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>