#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=f829f3bedca78154bd6213ee05455a8cc1c61761'>root</a>/<a href='/guix/log/gnu?id=f829f3bedca78154bd6213ee05455a8cc1c61761'>gnu</a>/<a href='/guix/log/gnu/tests?id=f829f3bedca78154bd6213ee05455a8cc1c61761'>tests</a>/<a href='/guix/log/gnu/tests/databases.scm?id=f829f3bedca78154bd6213ee05455a8cc1c61761'>databases.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/tests/databases.scm?id=f829f3bedca78154bd6213ee05455a8cc1c61761&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-12-09 23:15:44 +0100'>2024-12-09</span></td><td><a href='/guix/commit/gnu/tests/databases.scm?id=e7cd328714be93ed6a931c9110b52adc7b439752'>tests: Adjust for new return value of ‘start-service’.</a><span class='msg-avail'>...<span class='msg-tooltip'>In Shepherd 1.0, the “running value” of processes is no longer a plain
integer; instead, it is a (process …) sexp.  This commit adjusts tests
to this change in a way that works both for 1.0 and for previous
versions.

* gnu/tests/databases.scm (run-memcached-test)
(run-mysql-test): Don’t expect PID to be a number.
* gnu/tests/docker.scm (run-docker-test)
(run-docker-system-test, run-oci-container-test): Likewise.
* gnu/tests/guix.scm (run-guix-build-coordinator-test)
(run-guix-data-service-test, run-nar-herder-test)
(run-bffe-test): Likewise.
* gnu/tests/ldap.scm (run-ldap-test): Likewise.
* gnu/tests/monitoring.scm (run-prometheus-node-exporter-server-test):
Likewise.
* gnu/tests/virtualization.scm (run-libvirt-test)
(run-qemu-guest-agent-test, run-childhurd-test): Likewise.
* gnu/tests/web.scm (run-webserver-test, run-php-fpm-test)
(run-hpcguix-web-server-test, run-patchwork-test)
(run-agate-test): Likewise
* gnu/tests/ssh.scm (run-ssh-test): Accept a number, an ‘inetd-service’
sexp, or a ‘process’ sexp.

Change-Id: I8c7a37a981f0788780fbc33752a38e7f9a026437
</span></span></td><td>Ludovic Courtès</td></tr>