#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
}


}
guix/'>summary</a><a href='/guix/refs/?id=0d4af3c55c7fd75f03a0b6ecc059720657268ff3'>refs</a><a class='active' href='/guix/log/gnu/packages/libffi.scm'>log</a><a href='/guix/tree/gnu/packages/libffi.scm?id=0d4af3c55c7fd75f03a0b6ecc059720657268ff3'>tree</a><a href='/guix/commit/gnu/packages/libffi.scm?id=0d4af3c55c7fd75f03a0b6ecc059720657268ff3'>commit</a><a href='/guix/diff/gnu/packages/libffi.scm?id=0d4af3c55c7fd75f03a0b6ecc059720657268ff3'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/libffi.scm'>
<input type='hidden' name='id' value='0d4af3c55c7fd75f03a0b6ecc059720657268ff3'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=0d4af3c55c7fd75f03a0b6ecc059720657268ff3'>root</a>/<a href='/guix/log/gnu?id=0d4af3c55c7fd75f03a0b6ecc059720657268ff3'>gnu</a>/<a href='/guix/log/gnu/packages?id=0d4af3c55c7fd75f03a0b6ecc059720657268ff3'>packages</a>/<a href='/guix/log/gnu/packages/libffi.scm?id=0d4af3c55c7fd75f03a0b6ecc059720657268ff3'>libffi.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/libffi.scm?id=0d4af3c55c7fd75f03a0b6ecc059720657268ff3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-12-13 20:23:18 +0000'>2024-12-13</span></td><td><a href='/guix/commit/gnu/packages/libffi.scm?id=5c3e101ef470e7ee80fed1bc7afdf6fdf9ed4e7b'>gnu: python-cffi: Improve package style.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/libffi.scm: Add python-build and pyproject
modules. Select just pypi-uri symbol from python module.
(python-cffi): Fix indenation and adjust order of fileds.
[build-system]: Swap to pyproject-build-system.
[arguments]&lt;test-flags&gt;: Move tests directories and deselcect options
here.
&lt;phases&gt;: Use default 'check phase. Add 'set-gcc phase.
[native-inputs]: Add python-setuptools and python-wheel.

Change-Id: I0baa120ac86ef1c1e90cf44a4d439d874b8920b5
</span></span></td><td>Sharlatan Hellseher</td></tr>
<tr><td><span title='2024-12-13 20:19:11 +0000'>2024-12-13</span></td><td><a href='/guix/commit/gnu/packages/libffi.scm?id=45b51c7ed7d2daf781d3878db785df71fef3719b'>gnu: python-cffi: Update to 1.17.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/libffi.scm (python-cffi): Update to 1.17.1.
[phases]{check}: Adjust changed path to C sources.
{patch-paths-of-dynamically-loaded-libraries}: Likewise.

Change-Id: I76a58fbd339cef96379784ae670fc4b1339e3a9c
</span></span></td><td>Sharlatan Hellseher</td></tr>
<tr><td><span title='2024-12-03 08:33:13 +0100'>2024-12-03</span></td><td><a href='/guix/commit/gnu/packages/libffi.scm?id=962c8191d91b9482ebed8f8e7cc25cce6def9cf5'>gnu: libffi: Fix [cross-]build with gcc-14.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/libffi.scm (libffi)[arguments]: When building for the 64bit
Hurd, or cross-building, add "CFLAGS" to #:configure-flags to disable breaking
warning.

Change-Id: I05bf3f460f3e292626de1894b7a3cf381cb07702
</span></span></td><td>Janneke Nieuwenhuizen</td></tr>