#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=402ebffe195890c9826cfa7519034dd12a48ae6a'>root</a>/<a href='/guix/log/nix?id=402ebffe195890c9826cfa7519034dd12a48ae6a'>nix</a>/<a href='/guix/log/nix/libstore?id=402ebffe195890c9826cfa7519034dd12a48ae6a'>libstore</a>/<a href='/guix/log/nix/libstore/local-store.cc?id=402ebffe195890c9826cfa7519034dd12a48ae6a'>local-store.cc</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/nix/libstore/local-store.cc?id=402ebffe195890c9826cfa7519034dd12a48ae6a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-09-14 15:42:55 +0200'>2020-09-14</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=64cf660f872fb7aaf0d2b463e45b4c756297f743'>daemon: Spawn 'guix authenticate' once for all.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-09-14 15:42:55 +0200'>2020-09-14</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=27cc51c269fbe9d2ca65711d281c63ae441a9b4a'>daemon: Isolate signing and signature verification functions.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-09-11 17:53:58 +0200'>2020-09-11</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=6dd8ffc57420ee2f6f19e79e41028e78fe9e6a7e'>daemon: Simplify interface with 'guix authenticate'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-11-13 23:26:35 +0100'>2019-11-13</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=298fb2907e3f432cea7dee9f58e89ab8d9dbd56f'>daemon: Don't include &lt;linux/fs.h&gt;.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-10-16 22:53:40 +0200'>2019-10-16</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=81c580c8664bfeeb767e2c47ea343004e88223c7'>daemon: Make 'profiles/per-user' non-world-writable.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-08 11:49:24 +0200'>2019-09-08</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=f6919ebdc6b0ce0286814cc6ab0564b1a4c67f5f'>daemon: Run 'guix substitute' directly and assume a single substituter.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-08 11:49:24 +0200'>2019-09-08</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=0c684b7edfacada4f576855dbb09291f04a84fa2'>daemon: Run 'guix authenticate' directly.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-02-04 16:20:01 +0100'>2019-02-04</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=959eaa1eb834fd47ceab3c5bbbe4967e808d530b'>daemon: Add "/guix" to default 'nixLibexecDir'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-16 16:28:07 +0100'>2018-12-16</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=8327e733966cc4a93dfaadd1a761ca1088078baa'>daemon: Use unbranded phrases in comments and messages.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-14 21:34:08 +0100'>2018-11-14</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=0fe1fba4af41f267c4bb2c006fb37f42422ab703'>daemon: Install 'authenticate' script under LIBEXECDIR/guix.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-03-30 23:42:07 +0200'>2018-03-30</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=602a148650809da3c2356e4429f4b8160a72843b'>daemon: Remove unused schema upgrade code.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-10-28 22:30:17 +0200'>2016-10-28</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=b1fd0ab73425e682a0a1404da6963f47a033bb34'>daemon: Improve the SQLite wrapper API.</a><span class='msg-avail'>...</span></td><td>Eelco Dolstra</td></tr>
<tr><td><span title='2016-10-28 22:30:17 +0200'>2016-10-28</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=7bed5d91dea6ecff565d51a021e6f99718d04f86'>daemon: Factor out SQLite handling.</a><span class='msg-avail'>...</span></td><td>Eelco Dolstra</td></tr>
<tr><td><span title='2016-10-28 22:30:17 +0200'>2016-10-28</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=517ce0c15bdf802b3c378fff48b1e5be4167a4fa'>daemon: Turn retrying SQLite transactions into a higher-order function.</a><span class='msg-avail'>...</span></td><td>Eelco Dolstra</td></tr>