#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=5ba75d1078500e00d62a94040ad7a2d9caa17188'>root</a>/<a href='/guix/log/gnu?id=5ba75d1078500e00d62a94040ad7a2d9caa17188'>gnu</a>/<a href='/guix/log/gnu/packages?id=5ba75d1078500e00d62a94040ad7a2d9caa17188'>packages</a>/<a href='/guix/log/gnu/packages/dhall.scm?id=5ba75d1078500e00d62a94040ad7a2d9caa17188'>dhall.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/packages/dhall.scm?id=5ba75d1078500e00d62a94040ad7a2d9caa17188&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-02-26 10:26:07 +0100'>2023-02-26</span></td><td><a href='/guix/commit/gnu/packages/dhall.scm?id=49a320aaa6fb4c20d6b30c56c35a8c7ffceed822'>Upgrade Haskell packages.</a><span class='msg-avail'>...</span></td><td>Lars-Dominik Braun</td></tr>
<tr><td><span title='2023-02-26 10:20:14 +0100'>2023-02-26</span></td><td><a href='/guix/commit/gnu/packages/dhall.scm?id=890a181ed1766b433b5bfe1a3419b50ffa6503cb'>gnu: Use HACKAGE-URI for packages from Hackage.</a><span class='msg-avail'>...</span></td><td>Lars-Dominik Braun</td></tr>
<tr><td><span title='2023-02-26 10:20:11 +0100'>2023-02-26</span></td><td><a href='/guix/commit/gnu/packages/dhall.scm?id=cad6aa8082e99fe60570e3fd53a0e5876a8f243e'>gnu: Add upstream-name property to Haskell packages.</a><span class='msg-avail'>...</span></td><td>Lars-Dominik Braun</td></tr>
<tr><td><span title='2021-12-13 17:48:25 +0100'>2021-12-13</span></td><td><a href='/guix/commit/gnu/packages/dhall.scm?id=8394619baceb118df92e355377fd543bb1aa501a'>gnu: Simplify package inputs.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-10-08 09:13:54 +0200'>2021-10-08</span></td><td><a href='/guix/commit/gnu/packages/dhall.scm?id=d142843d150bf874bda2028262c7a6ebcef95b73'>gnu: ghc-repline: Remove version 0.2.0.0.</a><span class='msg-avail'>...</span></td><td>Lars-Dominik Braun</td></tr>
<tr><td><span title='2021-10-08 09:13:52 +0200'>2021-10-08</span></td><td><a href='/guix/commit/gnu/packages/dhall.scm?id=b97f549b14402421fcfb360ddd4cff7de93b9af0'>gnu: Update Haskell ecosystem.</a><span class='msg-avail'>...</span></td><td>Lars-Dominik Braun</td></tr>
<tr><td><span title='2020-06-09 23:52:20 +0200'>2020-06-09</span></td><td><a href='/guix/commit/gnu/packages/dhall.scm?id=2971ed57345ee4e00058efeaf27c6a0790fdc9dd'>gnu: dhall: Update to 1.32.0.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-06-09 23:52:19 +0200'>2020-06-09</span></td><td><a href='/guix/commit/gnu/packages/dhall.scm?id=5e7daec9b4bfd2a3a430fc800ab6b1b527a5fa27'>gnu: dhall: Disable network tests differently.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-05-29 10:44:34 -0400'>2020-05-29</span></td><td><a href='/guix/commit/gnu/packages/dhall.scm?id=9ff667ea05d0807b4e6512c92914ae517b9ec755'>gnu: Add dhall.</a><span class='msg-avail'>...</span></td><td>John Soo</td></tr>