#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
}


}
>summary</a><a href='/guix/refs/?id=298292e399bfacf1cf7363c73db5f8c7ef6c75ab'>refs</a><a class='active' href='/guix/log/gnu/services/vnc.scm'>log</a><a href='/guix/tree/gnu/services/vnc.scm?id=298292e399bfacf1cf7363c73db5f8c7ef6c75ab'>tree</a><a href='/guix/commit/gnu/services/vnc.scm?id=298292e399bfacf1cf7363c73db5f8c7ef6c75ab'>commit</a><a href='/guix/diff/gnu/services/vnc.scm?id=298292e399bfacf1cf7363c73db5f8c7ef6c75ab'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/vnc.scm'>
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<div class='path'>path: <a href='/guix/log/?id=298292e399bfacf1cf7363c73db5f8c7ef6c75ab'>root</a>/<a href='/guix/log/gnu?id=298292e399bfacf1cf7363c73db5f8c7ef6c75ab'>gnu</a>/<a href='/guix/log/gnu/services?id=298292e399bfacf1cf7363c73db5f8c7ef6c75ab'>services</a>/<a href='/guix/log/gnu/services/vnc.scm?id=298292e399bfacf1cf7363c73db5f8c7ef6c75ab'>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=298292e399bfacf1cf7363c73db5f8c7ef6c75ab&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-10-07 15:07:48 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/services/vnc.scm?id=00e843050012961e9cc41b003ea9271eab718541'>Revert "Revert "services: Add xvnc-service-type.""</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit 0c4966160054bc50e6ab3a4ac9c9a6a1826ab5a0.  The fix appears
in the subsequent commit, for clarity.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-10-07 12:53:22 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/services/vnc.scm?id=0c4966160054bc50e6ab3a4ac9c9a6a1826ab5a0'>Revert "services: Add xvnc-service-type."</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit 1c528a95cb92b7808e6603d7956185005583629f.  This broke
'guix pull', for (yet) unknown reasons.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-10-07 10:11:13 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/services/vnc.scm?id=1c528a95cb92b7808e6603d7956185005583629f'>services: Add xvnc-service-type.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/vnc.scm: New file.
* gnu/tests/vnc.scm: Likewise.
* gnu/local.mk: Register them.
</span></span></td><td>Maxim Cournoyer</td></tr>