Module: xenomai-3
Branch: master
Commit: 880b3acbd876a65f8fbe8c27b09762b06c06e846
URL:
http://git.xenomai.org/?p=xenomai-3.git;a=commit;h=880b3acbd876a65f8fbe8c27b09762b06c06e846
Author: Philippe Gerum <r...@xenomai.org>
Date: Sun Jul 26 12:37:15 2015 +0200
copperplate/registry: force SCHED_OTHER on helper threads
We might inherit SCHED_FIFO from the parent thread creating the
registry threads if --main-prio was given for starting the application
program.
Make sure to switch to SCHED_OTHER for serving registry requests.
---
lib/copperplate/regd/regd.c | 7 ++++++-
lib/copperplate/registry.c | 7 ++++++-
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/lib/copperplate/regd/regd.c b/lib/copperplate/regd/regd.c
index bcf5a9d..4f48273 100644
--- a/lib/copperplate/regd/regd.c
+++ b/lib/copperplate/regd/regd.c
@@ -471,7 +471,7 @@ bootstrap:
ret = bootstrap_core();
if (ret)
- error(1, -ret, "cannot bootstap core interface");
+ error(1, -ret, "cannot bootstrap core interface");
__copperplate_setup_data.session_label = session;
__copperplate_setup_data.registry_root = rootdir;
@@ -501,6 +501,7 @@ bootstrap:
int main(int argc, char *const *argv)
{
int lindex, opt, ret, flags = 0;
+ struct sched_param schedp;
struct sigaction sa;
for (;;) {
@@ -533,6 +534,10 @@ int main(int argc, char *const *argv)
if (rootdir == NULL)
error(1, EINVAL, "--root must be given");
+ /* Force SCHED_OTHER. */
+ schedp.sched_priority = 0;
+ pthread_setschedparam(pthread_self(), SCHED_OTHER, &schedp);
+
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_IGN;
sigaction(SIGCHLD, &sa, NULL);
diff --git a/lib/copperplate/registry.c b/lib/copperplate/registry.c
index adf0d73..c379f15 100644
--- a/lib/copperplate/registry.c
+++ b/lib/copperplate/registry.c
@@ -751,6 +751,7 @@ int __registry_pkg_init(const char *arg0, char *mountpt,
int flags)
{
struct regfs_data *p = regfs_get_context();
pthread_mutexattr_t mattr;
+ struct sched_param schedp;
pthread_attr_t thattr;
int ret;
@@ -768,8 +769,12 @@ int __registry_pkg_init(const char *arg0, char *mountpt,
int flags)
registry_add_dir("/"); /* Create the fs root. */
- /* We want a SCHED_OTHER thread, use defaults. */
+ /* We want a SCHED_OTHER thread. */
pthread_attr_init(&thattr);
+ pthread_attr_setinheritsched(&thattr, PTHREAD_EXPLICIT_SCHED);
+ pthread_attr_setschedpolicy(&thattr, SCHED_OTHER);
+ schedp.sched_priority = 0;
+ pthread_attr_setschedparam(&thattr, &schedp);
/*
* Memory is locked as the process data grows, so we set a
* smaller stack size for the fs thread than the default 8mb
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