#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=5b0289870a76e18a42a236053183d57258a48826'>root</a>/<a href='/guix/log/tests?id=5b0289870a76e18a42a236053183d57258a48826'>tests</a>/<a href='/guix/log/tests/pack.scm?id=5b0289870a76e18a42a236053183d57258a48826'>pack.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/tests/pack.scm?id=5b0289870a76e18a42a236053183d57258a48826&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-08-27 12:20:44 +0200'>2019-08-27</span></td><td><a href='/guix/commit/tests/pack.scm?id=7979a287f8eb84cbbfa44629951572408939a756'>pack: Create /tmp in Docker images.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-24 00:13:53 +0100'>2019-03-24</span></td><td><a href='/guix/commit/tests/pack.scm?id=9c2e58564f3c8b53ce86d5791e3ea5818e1a4fd6'>tests: Adjust 'guix pack -f squashfs' test.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-06 23:21:24 +0100'>2018-11-06</span></td><td><a href='/guix/commit/tests/pack.scm?id=72dc64f8f720268930eed448abfc15d2a0eca3cf'>store-copy: Canonicalize the mtime and permissions of the store copy.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-06 23:21:24 +0100'>2018-11-06</span></td><td><a href='/guix/commit/tests/pack.scm?id=1ff53787dbd4b1846ae523aef86ada3996de5e6d'>pack: Add test for 'self-contained-tarball' with localstatedir.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-06 23:21:24 +0100'>2018-11-06</span></td><td><a href='/guix/commit/tests/pack.scm?id=598a6b87cc6636aee9dec57ae95922da0a6e31e8'>pack: Squashfs backend now honors '--localstatedir'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-06 23:21:24 +0100'>2018-11-06</span></td><td><a href='/guix/commit/tests/pack.scm?id=f5a2fb1bfbb620a6ce23ac0e7e15132cae9207da'>pack: Docker backend now honors '--localstatedir'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-06 23:21:23 +0100'>2018-11-06</span></td><td><a href='/guix/commit/tests/pack.scm?id=b27ef1d46cfdc3c994b106241f99cd7142083d13'>pack: Import (guix store database) only when '--localstatedir' is passed.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-10-28 00:30:50 +0200'>2018-10-28</span></td><td><a href='/guix/commit/tests/pack.scm?id=ec397b312f901da59d9a2e1cffb26bf31507e61f'>tests: Fix typo.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-10-19 18:28:57 +0200'>2018-10-19</span></td><td><a href='/guix/commit/tests/pack.scm?id=19c924af4f3726688ca155a905ebf1cb9acdfca2'>tests: Run 'guix pack' tests using the external store.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-18 23:23:44 +0200'>2018-09-18</span></td><td><a href='/guix/commit/tests/pack.scm?id=cda08dd339112c78881e91597326498331b16dca'>tests: Skip 'self-contained-tarball' test unconditionally.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-06-01 15:17:41 +0200'>2018-06-01</span></td><td><a href='/guix/commit/tests/pack.scm?id=ccc951cab3172adfdaf6fd2dfa8f8cdb98358a69'>pack: Adjust test to expect relative symlinks.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-06-01 14:18:31 +0200'>2018-06-01</span></td><td><a href='/guix/commit/tests/pack.scm?id=44057a461b1fa8102938c4e0f54d7cbc9dd09b03'>tests: Fix arguments in pack test.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-03-22 15:02:33 +0100'>2017-03-22</span></td><td><a href='/guix/commit/tests/pack.scm?id=50b4d3ac2699764079882eea164cb176a74799aa'>tests: Skip 'guix pack' test when networking is unavailable.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-03-17 23:25:53 +0100'>2017-03-17</span></td><td><a href='/guix/commit/tests/pack.scm?id=48b444304e206c35cf2c8e0d87a4711f1aac4fd4'>pack: Move absolute file name to &lt;compressor&gt;.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-03-14 23:18:32 +0100'>2017-03-14</span></td><td><a href='/guix/commit/tests/pack.scm?id=850edd77f92c1f40a1593f3505ff82fdd8719bad'>pack: Add unit test.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>