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libc: support manual pthread configuration

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Fixes #3787
This commit is contained in:
Alexander Boettcher 2020-06-16 13:50:21 +02:00 committed by Norman Feske
parent 2471410fe5
commit 1ec823bf5e
1 changed files with 36 additions and 4 deletions
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40
repos/libports/src/lib/libc/pthread_create.cc
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@ -30,18 +30,45 @@
static Genode::Cpu_session * _cpu_session { nullptr };
static bool _single_cpu { false };
static unsigned _id_cpu_map[32];
static bool _verbose { false };
void Libc::init_pthread_support(Genode::Cpu_session &cpu_session,
Genode::Xml_node node)
{
_cpu_session = &cpu_session;
_verbose = node.attribute_value("verbose", false);
String<32> placement("all-cpus");
placement = node.attribute_value("placement", placement);
if (placement == "single-cpu")
_single_cpu = true;
if (placement == "single-cpu") {
return;
}
if (placement == "manual") {
node.for_each_sub_node("thread", [](Xml_node &node) {
if (node.has_attribute("id") && node.has_attribute("cpu")) {
unsigned const id = node.attribute_value("id", 0U);
unsigned const cpu = node.attribute_value("cpu", 0U);
if (id < sizeof(_id_cpu_map) / sizeof(_id_cpu_map[0])) {
_id_cpu_map[id] = cpu;
if (_verbose)
Genode::log("pthread.", id, " -> cpu ", cpu);
} else {
Genode::warning("pthread configuration ignored - "
"id=", id, " cpu=", cpu);
}
}
});
return;
}
/* all-cpus and unknown case */
for (unsigned i = 0; i < sizeof(_id_cpu_map) / sizeof(_id_cpu_map[0]); i++)
_id_cpu_map[i] = i;
}
@ -105,9 +132,14 @@ extern "C"
using Genode::Affinity;
unsigned const id { pthread_id() };
unsigned const cpu = (id < sizeof(_id_cpu_map) / sizeof(_id_cpu_map[0])) ? _id_cpu_map[id] : 0;
Genode::String<32> const pthread_name { "pthread.", id };
Affinity::Space space { _cpu_session->affinity_space() };
Affinity::Location location { space.location_of_index(_single_cpu ? 0 : id) };
Affinity::Location location { space.location_of_index(cpu) };
if (_verbose)
Genode::log("create ", pthread_name, " -> cpu ", cpu);
return Libc::pthread_create(thread, start_routine, arg, stack_size,
pthread_name.string(), _cpu_session,