#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=8f78f61c029bb45c39fa782f8ac2c6962e44cdab'>root</a>/<a href='/guix/log/gnu?id=8f78f61c029bb45c39fa782f8ac2c6962e44cdab'>gnu</a>/<a href='/guix/log/gnu/build?id=8f78f61c029bb45c39fa782f8ac2c6962e44cdab'>build</a>/<a href='/guix/log/gnu/build/chromium-extension.scm?id=8f78f61c029bb45c39fa782f8ac2c6962e44cdab'>chromium-extension.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/build/chromium-extension.scm?id=8f78f61c029bb45c39fa782f8ac2c6962e44cdab&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-11-08 18:21:15 +0100'>2020-11-08</span></td><td><a href='/guix/commit/gnu/build/chromium-extension.scm?id=d7a295b24b8b84ca3193d30249a01f292178105a'>Add (gnu build chromium-extension).</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/chromium-extension.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Adjust accordingly.
</span></span></td><td>Marius Bakke</td></tr>
1dc631e4f7.

* gnu/home.scm (%profile-generation-rx): New variable.
(home-generation-base): New procedure.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-07-17 02:00:00 +0200'>2022-07-17</span></td><td><a href='/guix/commit/gnu/home.scm?id=670818a4049edb8a77a5b596fbc7558bde57165c'>Revert "home: Add 'home-generation-base'."</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit 5df8f7802e8b45855e8f84830677001dc631e4f7.
This commit or the next one appears to have broken ‘guix pull’.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2022-07-23 00:39:55 +0200'>2022-07-23</span></td><td><a href='/guix/commit/gnu/home.scm?id=5df8f7802e8b45855e8f84830677001dc631e4f7'>home: Add 'home-generation-base'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/home.scm (%profile-generation-rx): New variable.
(home-generation-base): New procedure.
</span></span></td><td>Ludovic Courtès</td></tr>