#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='2021-06-01 14:33:27 +0200'>2021-06-01</span></td><td><a href='/guix/commit/gnu/tests/web.scm?id=0b76b25a0eff7a422f8ebcc8c095d7ede82c8863'>tests: hpcguix-web: Fix it.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2021-04-18 09:52:18 +0200'>2021-04-18</span></td><td><a href='/guix/commit/gnu/tests/web.scm?id=89af95313d031e1a8a57c6a10f20a636884872b5'>tests: Increase VM memory size.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2021-04-18 09:52:18 +0200'>2021-04-18</span></td><td><a href='/guix/commit/gnu/tests/web.scm?id=3b5c4e6fb285e29a6d348732852e0407c28e30f4'>tests: patchwork: Fix it.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2021-04-12 19:12:46 -0400'>2021-04-12</span></td><td><a href='/guix/commit/gnu/tests/web.scm?id=c311147bd16aa0e5746d9cbf31502f5fd61e470c'>services: postgresql: Change service default socket directory.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>