#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=a0d13ff8609e6276664d9c246b6b929ba29dcab2'>root</a>/<a href='/guix/log/gnu?id=a0d13ff8609e6276664d9c246b6b929ba29dcab2'>gnu</a>/<a href='/guix/log/gnu/services?id=a0d13ff8609e6276664d9c246b6b929ba29dcab2'>services</a>/<a href='/guix/log/gnu/services/vnc.scm?id=a0d13ff8609e6276664d9c246b6b929ba29dcab2'>vnc.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/vnc.scm?id=a0d13ff8609e6276664d9c246b6b929ba29dcab2&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-11-27 10:55:51 -0500'>2023-11-27</span></td><td><a href='/guix/commit/gnu/services/vnc.scm?id=dce3672f5a8eb440ae61a334384423d1e2ff5e65'>services: xvnc: Do not specify display number when using inetd.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/vnc.scm (xvnc-configuration-&gt;command-line-arguments): Omit X
display number when inetd? is #t.

Change-Id: I0fc8e3068f3ae22421e60e96bd40e3b6e477ca99
</span></span></td><td>David Thompson</td></tr>