#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=7314a5475e8fe0fc7ffe17d2cc30b4ae8c5381b2'>root</a>/<a href='/guix/log/build-aux?id=7314a5475e8fe0fc7ffe17d2cc30b4ae8c5381b2'>build-aux</a>/<a href='/guix/log/build-aux/git-version-gen?id=7314a5475e8fe0fc7ffe17d2cc30b4ae8c5381b2'>git-version-gen</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/build-aux/git-version-gen?id=7314a5475e8fe0fc7ffe17d2cc30b4ae8c5381b2&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-05-04 23:51:45 +0200'>2017-05-04</span></td><td><a href='/guix/commit/build-aux/git-version-gen?id=e6860b5e7f8ded96c1769dcff27dffb97587e3e2'>build: Use Gnulib's 'git-version-gen'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* Makefile.am (EXTRA_DIST, BUILT_SOURCES): Add $(top_srcdir)/.version.
($(top_srcdir)/.version, gen-tarball-version): New targets.
(dist-hook): Depend on 'gen-tarball-version'.
(.PHONY): Add 'gen-tarball-version'.
* build-aux/git-version-gen: New file, from Gnulib v0.1-1312-ga87d5e5c6.
* configure.ac: Use it in 'AC_INIT'.  Use 'https' for the URL.
</span></span></td><td>Ludovic Courtès</td></tr>